The document discusses deformation mechanisms in high entropy alloys. It describes how dislocation slip, mechanical twinning, phase transformations, and stacking faults can mediate plastic deformation. Dislocation slip is common in FCC structured alloys while motion of screw dislocations occurs in BCC alloys. Mechanical twinning becomes prominent at higher strains. Phase transformations can extend ductility via TRIP effects. Low stacking fault energy materials exhibit dissociation of dislocations and wider stacking faults. A variety of strengthening mechanisms operate in high entropy alloys, including lattice distortion, solid solution strengthening, and grain boundary strengthening.
The document discusses dislocation theory and behavior in different crystal structures. It covers:
- Observation techniques for dislocations like etching and transmission electron microscopy
- Key concepts like Burgers vector, dislocation loops, and dissociation of dislocations into partial dislocations
- Differences in dislocation behavior in FCC, BCC, and HCP lattices including slip systems and interactions between dislocations
- Stress fields and strain energies of dislocations as well as forces acting on dislocations and between dislocations
- Mechanisms of dislocation motion including glide, cross-slip, and climb that enable plastic deformation.
High Entropy Alloy was discovered in 1996. Being a completely new topic, it is unknown to us in all aspects. It's excellent combination of all mechanical properties is representing a new frontier in Materials Engineering field of research.
High Entropy Alloys are a new class of alloys discovered to perform at potentially useful applications. Eg : CoCrFeMnNi is useful for Cryogenic applications and MoNbTaWV is useful for Refractory applications.
This document provides an overview of dislocations in face-centered cubic (FCC) metals. It discusses several types of dislocations that can occur in FCC metals including perfect dislocations with 1/2<110> Burgers vectors, Shockley partial dislocations formed by splitting a perfect dislocation, and Frank partial dislocations formed by inserting or removing a close-packed plane. The document also describes how Shockley partial dislocations can cross-slip between planes, the formation of Lomer-Cottrell locks at intersections of partial dislocations, and the nucleation of stacking fault tetrahedra in low stacking fault energy metals.
what is laser hardening
process of laser hardening
hardening of cast iron
process variables
differences with other conventional process
advantages and disadvantages
This document provides an overview of high entropy alloys (HEAs). It discusses how HEAs were discovered in 1996 and research interest increased after 2004 papers by Yeh and Cantor. Key points include: HEAs have 5+ principal elements each between 5-35% concentration; entropy effect stabilizes solid solution phase; criteria for HEAs include parameters like entropy of mixing and valence electron concentration; four core effects are lattice distortion, sluggish diffusion, cocktail effect, and formation of solid solution phase. Examples of HEA applications discussed are coatings, bulk metallic glass, and refractory and carbide/cermet materials. The conclusion emphasizes that computational modeling of HEA properties could help address misconceptions about these materials.
The document discusses dislocation theory and behavior in different crystal structures. It covers:
- Observation techniques for dislocations like etching and transmission electron microscopy
- Key concepts like Burgers vector, dislocation loops, and dissociation of dislocations into partial dislocations
- Differences in dislocation behavior in FCC, BCC, and HCP lattices including slip systems and interactions between dislocations
- Stress fields and strain energies of dislocations as well as forces acting on dislocations and between dislocations
- Mechanisms of dislocation motion including glide, cross-slip, and climb that enable plastic deformation.
High Entropy Alloy was discovered in 1996. Being a completely new topic, it is unknown to us in all aspects. It's excellent combination of all mechanical properties is representing a new frontier in Materials Engineering field of research.
High Entropy Alloys are a new class of alloys discovered to perform at potentially useful applications. Eg : CoCrFeMnNi is useful for Cryogenic applications and MoNbTaWV is useful for Refractory applications.
This document provides an overview of dislocations in face-centered cubic (FCC) metals. It discusses several types of dislocations that can occur in FCC metals including perfect dislocations with 1/2<110> Burgers vectors, Shockley partial dislocations formed by splitting a perfect dislocation, and Frank partial dislocations formed by inserting or removing a close-packed plane. The document also describes how Shockley partial dislocations can cross-slip between planes, the formation of Lomer-Cottrell locks at intersections of partial dislocations, and the nucleation of stacking fault tetrahedra in low stacking fault energy metals.
what is laser hardening
process of laser hardening
hardening of cast iron
process variables
differences with other conventional process
advantages and disadvantages
This document provides an overview of high entropy alloys (HEAs). It discusses how HEAs were discovered in 1996 and research interest increased after 2004 papers by Yeh and Cantor. Key points include: HEAs have 5+ principal elements each between 5-35% concentration; entropy effect stabilizes solid solution phase; criteria for HEAs include parameters like entropy of mixing and valence electron concentration; four core effects are lattice distortion, sluggish diffusion, cocktail effect, and formation of solid solution phase. Examples of HEA applications discussed are coatings, bulk metallic glass, and refractory and carbide/cermet materials. The conclusion emphasizes that computational modeling of HEA properties could help address misconceptions about these materials.
The document discusses various microstructural transformations in steel alloys as a function of temperature and time. It introduces time-temperature-transformation (TTT) diagrams and continuous cooling transformation (CCT) diagrams as tools to predict microstructures resulting from different heat treatments. TTT diagrams apply to isothermal heat treatments where temperature is held constant, while CCT diagrams apply to continuous cooling processes. The document outlines various microstructures including pearlite, bainite, martensite, and spheroidite and how they form on these diagrams. It also discusses how alloying elements can shift the transformation curves and impact critical cooling rates required to form martensite.
This document discusses voids in different crystal structures including simple cubic, body centered cubic, face centered cubic, and hexagonal close packed structures. It describes the shapes and positions of tetrahedral and octahedral voids. In FCC and HCP crystals, the voids have regular tetrahedral and octahedral shapes, whereas in BCC crystals the voids are distorted versions of tetrahedra and octahedra. The size of voids relative to atom sizes determines which voids interstitial atoms can fit into. Carbon prefers the smaller distorted octahedral void in BCC iron due to minimal distortion of the surrounding atoms.
Order disorder transformation( the kinetics behind)Zaahir Salam
The document discusses order and disorder in physics systems. [1] Order refers to symmetry or correlation in particle systems, while disorder is the absence of order. [2] Systems typically change from ordered at low temperatures to less ordered states as they are heated through phase transitions. [3] Examples of order-disorder transitions include the melting of ice and the demagnetization of iron by heating.
This document discusses diffusionless martensitic transformations in steels. It begins by defining phase transformations and diffusionless transformations. It then focuses on martensitic transformations specifically, describing how austenite transforms to martensite via a diffusionless mechanism involving small atomic displacements. Martensite that forms is metastable and can be tempered to form tempered martensite, which is less brittle. Time-temperature-transformation diagrams are presented showing the various phases that form under different cooling conditions. The effects of alloying elements on these diagrams are also discussed.
Phase transformations can occur in materials through changes in temperature, composition, or external pressure. These transformations involve changes in the crystal structure or phases of the material on an atomic scale.
Three key phase transformations discussed in the document are the transformation of austenite to pearlite or bainite in steels through diffusion-dependent or diffusionless processes, the transformation of austenite to martensite through rapid cooling, and shape memory effects seen in alloys like nickel-titanium.
The properties of the material, like its strength and hardness, depend on the microstructure resulting from the phase transformation, such as pearlite, bainite, or martensite, which can be controlled through heat
Martensitic transformations are diffusionless, solid-state structural changes driven by shear displacements. They occur rapidly in many metal, ceramic, and polymer systems. Important examples include the transformation of austenite to martensite in steels during quenching, and the shape memory effect exploited in medical devices like stents. The Bain model originally proposed the mechanism as a combination of homogeneous lattice deformation and atomic shuffles, but has inconsistencies. Modern understanding involves dislocation or shear-based mechanisms constrained by the crystallography of the parent and product phases.
There are several types of defects that can occur in crystalline materials, including point defects, line defects, and grain boundaries. Point defects include vacancies, interstitial atoms, and substitutional/interstitial impurities. Line defects include stacking faults which occur when the regular stacking sequence of atomic planes is disturbed. Grain boundaries separate crystalline grains of different orientations in polycrystalline materials. These defects influence many properties of materials.
Ni-based superalloys are excellent high-temperature materials and have proven very useful, Co-based superalloys potentially possess superior hot corrosion, oxidation, and wear resistance as compared to Ni-based superalloys. For this reason, efforts have also been put into developing Co-based superalloys over the past several years.
This document provides an overview of welding metallurgy. It discusses the microstructure of welds and how the rapid changes in temperature during welding affect the physical characteristics and properties of metals. It examines the different zones that form in steel welds, including the fusion zone where grains are epitaxially formed, and the heat-affected zone. Problems that can occur during welding due to remelting and solidification are also summarized, such as macrosegregation, hot cracking, and cold cracking.
The document discusses phase transformations in materials and heat treatments. It explains that phase transformations can be used to vary the mechanical properties of alloys between 700-2000 MPa depending on the heat treatment. Time-temperature-transformation (TTT) diagrams are used to determine when phase transformations start and end during isothermal heat treatments. TTT diagrams have a characteristic C-shape due to the competing factors of nucleation and diffusion rates during transformations. The position and shape of TTT curves are affected by variables like carbon content, alloying elements, and grain size of the material.
High entropy alloys (HEAs) can be produced through various methods depending on their initial state - liquid, solid, or gas. They have superior mechanical and thermal properties and potential applications in industries like transportation, energy, aerospace, and food preservation due to properties like high strength, corrosion and wear resistance. While HEAs are still an emerging field being explored, continued research on new compositions and manufacturing methods may further improve our understanding and utilization of these materials.
This document discusses plastic deformation in metals caused by the motion of dislocations. There are two main types of dislocations - edge and screw. Dislocations normally move under shear stress, allowing permanent deformation. Slip and twinning are two modes of plastic deformation that involve the motion of dislocations on specific crystallographic planes and directions. Strengthening methods like work hardening, solid solution strengthening, grain refinement, and precipitation hardening make it harder for dislocations to move by introducing barriers to their motion. This increases the strength of metals.
This document discusses various types of imperfections that can occur in crystal structures, including point defects (vacancies, self-interstitials, substitutional impurities), line defects (dislocations like edge and screw dislocations), and planar defects (grain boundaries, twin boundaries, stacking faults). It provides examples of each type of defect, diagrams to illustrate defects like vacancies, interstitials, and different types of dislocations, and brief explanations of defects like Frenkel defects and Schottky defects. The document also mentions defects leading to properties like specific heat and electrical resistance, and discusses concepts like slip and twinning during plastic deformation.
This document discusses fractography, which is the analysis of fracture surfaces. It begins by defining fractography and distinguishing between macrofractography and microfractography. Macrofractography examines fracture surfaces with the naked eye or low-power magnification and can reveal features like the fracture type, origin, and secondary cracks. Microfractography uses higher magnification microscopy to study details like dimple shapes that indicate the fracture mode. Examples are given of using scanning electron microscopes to analyze ductile and brittle fracture surfaces at the microscopic level.
Phase transformations occur when a new solid phase forms within a liquid or existing solid phase. The driving force for phase transformations, such as solidification or precipitation, is the reduction in free energy that results from the transformation. For homogeneous nucleation of a new solid phase within a liquid or supersaturated solid solution, the driving force is approximately proportional to the degree of undercooling below the equilibrium transformation temperature. A higher driving force reduces the nucleation barrier and exponentially increases the nucleation rate. Diffusion and elastic effects can also influence nucleation by modifying the driving force and nucleation barrier.
The document describes the process of creating a sample for transmission electron microscopy (TEM) using a focused ion beam (FIB). Key steps include:
1) Protecting the area of interest with a platinum coating to prevent ion damage during milling.
2) Milling trenches around the area and cutting it into a rectangular sample attached by a thin section.
3) Plucking the sample from the bulk material using a probe and welding it to a TEM grid.
4) Polishing the sample to a thin, uniform thickness of around 100nm for atomic resolution TEM imaging of features like grain boundary complexions.
Cathodic sputtering is a thin film deposition technique where a target material is bombarded with energetic ions, ejecting atoms from the surface that are then deposited on a substrate. There are two main types: glow discharge sputtering and low pressure sputtering. Glow discharge sputtering uses a glow discharge to generate ions from a gas to sputter the target material and works best at pressures between 25-75 mTorr. Low pressure sputtering reduces collisions of sputtered atoms with gas to improve directionality and energy, including triode sputtering which uses an auxiliary electrode to increase ion generation efficiency.
The document discusses hydrogen embrittlement, which is when metals like titanium and vanadium become brittle due to hydrogen diffusion. Hydrogen is introduced through processes like welding, corrosion, and melting. There are three proposed mechanisms for embrittlement: hydrogen-enhanced de-cohesion causes reduced bonding strength; hydrogen-enhanced local plasticity enhances localized plastic deformation; and adsorption-induced dislocation emission facilitates dislocation movement near cracks. Tests like linearly increasing stress tests, temperature-programmed desorption, and electrochemical permeation help evaluate embrittlement.
This document discusses ordering transformations in alloys. It defines short and long range order, and the difference between superlattices and ordered structures. Common ordered structures include B2, L10, L12, and D03. Ordering transformations are governed by thermodynamics and the Gibbs free energy equation. Identification of ordered structures can be done through XRD, dilatometry, resistivity measurements, and TEM. Antiphase boundaries form when ordered domains meet. Dislocations in ordered structures typically occur in pairs to avoid antiphase boundaries. Recovery and recrystallization behaviors differ depending on the ordered or disordered state during deformation.
Isotopes are two atoms of the same element that have the same number of protons but different numbers of neutrons. Isotopes are specified by the mass number.
The document discusses various microstructural transformations in steel alloys as a function of temperature and time. It introduces time-temperature-transformation (TTT) diagrams and continuous cooling transformation (CCT) diagrams as tools to predict microstructures resulting from different heat treatments. TTT diagrams apply to isothermal heat treatments where temperature is held constant, while CCT diagrams apply to continuous cooling processes. The document outlines various microstructures including pearlite, bainite, martensite, and spheroidite and how they form on these diagrams. It also discusses how alloying elements can shift the transformation curves and impact critical cooling rates required to form martensite.
This document discusses voids in different crystal structures including simple cubic, body centered cubic, face centered cubic, and hexagonal close packed structures. It describes the shapes and positions of tetrahedral and octahedral voids. In FCC and HCP crystals, the voids have regular tetrahedral and octahedral shapes, whereas in BCC crystals the voids are distorted versions of tetrahedra and octahedra. The size of voids relative to atom sizes determines which voids interstitial atoms can fit into. Carbon prefers the smaller distorted octahedral void in BCC iron due to minimal distortion of the surrounding atoms.
Order disorder transformation( the kinetics behind)Zaahir Salam
The document discusses order and disorder in physics systems. [1] Order refers to symmetry or correlation in particle systems, while disorder is the absence of order. [2] Systems typically change from ordered at low temperatures to less ordered states as they are heated through phase transitions. [3] Examples of order-disorder transitions include the melting of ice and the demagnetization of iron by heating.
This document discusses diffusionless martensitic transformations in steels. It begins by defining phase transformations and diffusionless transformations. It then focuses on martensitic transformations specifically, describing how austenite transforms to martensite via a diffusionless mechanism involving small atomic displacements. Martensite that forms is metastable and can be tempered to form tempered martensite, which is less brittle. Time-temperature-transformation diagrams are presented showing the various phases that form under different cooling conditions. The effects of alloying elements on these diagrams are also discussed.
Phase transformations can occur in materials through changes in temperature, composition, or external pressure. These transformations involve changes in the crystal structure or phases of the material on an atomic scale.
Three key phase transformations discussed in the document are the transformation of austenite to pearlite or bainite in steels through diffusion-dependent or diffusionless processes, the transformation of austenite to martensite through rapid cooling, and shape memory effects seen in alloys like nickel-titanium.
The properties of the material, like its strength and hardness, depend on the microstructure resulting from the phase transformation, such as pearlite, bainite, or martensite, which can be controlled through heat
Martensitic transformations are diffusionless, solid-state structural changes driven by shear displacements. They occur rapidly in many metal, ceramic, and polymer systems. Important examples include the transformation of austenite to martensite in steels during quenching, and the shape memory effect exploited in medical devices like stents. The Bain model originally proposed the mechanism as a combination of homogeneous lattice deformation and atomic shuffles, but has inconsistencies. Modern understanding involves dislocation or shear-based mechanisms constrained by the crystallography of the parent and product phases.
There are several types of defects that can occur in crystalline materials, including point defects, line defects, and grain boundaries. Point defects include vacancies, interstitial atoms, and substitutional/interstitial impurities. Line defects include stacking faults which occur when the regular stacking sequence of atomic planes is disturbed. Grain boundaries separate crystalline grains of different orientations in polycrystalline materials. These defects influence many properties of materials.
Ni-based superalloys are excellent high-temperature materials and have proven very useful, Co-based superalloys potentially possess superior hot corrosion, oxidation, and wear resistance as compared to Ni-based superalloys. For this reason, efforts have also been put into developing Co-based superalloys over the past several years.
This document provides an overview of welding metallurgy. It discusses the microstructure of welds and how the rapid changes in temperature during welding affect the physical characteristics and properties of metals. It examines the different zones that form in steel welds, including the fusion zone where grains are epitaxially formed, and the heat-affected zone. Problems that can occur during welding due to remelting and solidification are also summarized, such as macrosegregation, hot cracking, and cold cracking.
The document discusses phase transformations in materials and heat treatments. It explains that phase transformations can be used to vary the mechanical properties of alloys between 700-2000 MPa depending on the heat treatment. Time-temperature-transformation (TTT) diagrams are used to determine when phase transformations start and end during isothermal heat treatments. TTT diagrams have a characteristic C-shape due to the competing factors of nucleation and diffusion rates during transformations. The position and shape of TTT curves are affected by variables like carbon content, alloying elements, and grain size of the material.
High entropy alloys (HEAs) can be produced through various methods depending on their initial state - liquid, solid, or gas. They have superior mechanical and thermal properties and potential applications in industries like transportation, energy, aerospace, and food preservation due to properties like high strength, corrosion and wear resistance. While HEAs are still an emerging field being explored, continued research on new compositions and manufacturing methods may further improve our understanding and utilization of these materials.
This document discusses plastic deformation in metals caused by the motion of dislocations. There are two main types of dislocations - edge and screw. Dislocations normally move under shear stress, allowing permanent deformation. Slip and twinning are two modes of plastic deformation that involve the motion of dislocations on specific crystallographic planes and directions. Strengthening methods like work hardening, solid solution strengthening, grain refinement, and precipitation hardening make it harder for dislocations to move by introducing barriers to their motion. This increases the strength of metals.
This document discusses various types of imperfections that can occur in crystal structures, including point defects (vacancies, self-interstitials, substitutional impurities), line defects (dislocations like edge and screw dislocations), and planar defects (grain boundaries, twin boundaries, stacking faults). It provides examples of each type of defect, diagrams to illustrate defects like vacancies, interstitials, and different types of dislocations, and brief explanations of defects like Frenkel defects and Schottky defects. The document also mentions defects leading to properties like specific heat and electrical resistance, and discusses concepts like slip and twinning during plastic deformation.
This document discusses fractography, which is the analysis of fracture surfaces. It begins by defining fractography and distinguishing between macrofractography and microfractography. Macrofractography examines fracture surfaces with the naked eye or low-power magnification and can reveal features like the fracture type, origin, and secondary cracks. Microfractography uses higher magnification microscopy to study details like dimple shapes that indicate the fracture mode. Examples are given of using scanning electron microscopes to analyze ductile and brittle fracture surfaces at the microscopic level.
Phase transformations occur when a new solid phase forms within a liquid or existing solid phase. The driving force for phase transformations, such as solidification or precipitation, is the reduction in free energy that results from the transformation. For homogeneous nucleation of a new solid phase within a liquid or supersaturated solid solution, the driving force is approximately proportional to the degree of undercooling below the equilibrium transformation temperature. A higher driving force reduces the nucleation barrier and exponentially increases the nucleation rate. Diffusion and elastic effects can also influence nucleation by modifying the driving force and nucleation barrier.
The document describes the process of creating a sample for transmission electron microscopy (TEM) using a focused ion beam (FIB). Key steps include:
1) Protecting the area of interest with a platinum coating to prevent ion damage during milling.
2) Milling trenches around the area and cutting it into a rectangular sample attached by a thin section.
3) Plucking the sample from the bulk material using a probe and welding it to a TEM grid.
4) Polishing the sample to a thin, uniform thickness of around 100nm for atomic resolution TEM imaging of features like grain boundary complexions.
Cathodic sputtering is a thin film deposition technique where a target material is bombarded with energetic ions, ejecting atoms from the surface that are then deposited on a substrate. There are two main types: glow discharge sputtering and low pressure sputtering. Glow discharge sputtering uses a glow discharge to generate ions from a gas to sputter the target material and works best at pressures between 25-75 mTorr. Low pressure sputtering reduces collisions of sputtered atoms with gas to improve directionality and energy, including triode sputtering which uses an auxiliary electrode to increase ion generation efficiency.
The document discusses hydrogen embrittlement, which is when metals like titanium and vanadium become brittle due to hydrogen diffusion. Hydrogen is introduced through processes like welding, corrosion, and melting. There are three proposed mechanisms for embrittlement: hydrogen-enhanced de-cohesion causes reduced bonding strength; hydrogen-enhanced local plasticity enhances localized plastic deformation; and adsorption-induced dislocation emission facilitates dislocation movement near cracks. Tests like linearly increasing stress tests, temperature-programmed desorption, and electrochemical permeation help evaluate embrittlement.
This document discusses ordering transformations in alloys. It defines short and long range order, and the difference between superlattices and ordered structures. Common ordered structures include B2, L10, L12, and D03. Ordering transformations are governed by thermodynamics and the Gibbs free energy equation. Identification of ordered structures can be done through XRD, dilatometry, resistivity measurements, and TEM. Antiphase boundaries form when ordered domains meet. Dislocations in ordered structures typically occur in pairs to avoid antiphase boundaries. Recovery and recrystallization behaviors differ depending on the ordered or disordered state during deformation.
Isotopes are two atoms of the same element that have the same number of protons but different numbers of neutrons. Isotopes are specified by the mass number.
The document contains questions from multiple individuals about metallurgy concepts such as Burger vectors, Schottky defects, slip systems, and point defects. Members provide concise answers explaining these concepts, including mathematical equations where applicable. One group question is also included covering topics like strengthening mechanisms, recovery/recrystallization/grain growth, defects, dislocations, and twinning.
reactivity in chemisorption and catalysis of monometallic particlesPRASHANTH GOPI
This document discusses the properties and reactivity of nanoparticles for catalysis applications. It notes that nanoparticles have a high surface area to volume ratio, which allows them to be more reactive. The physical and electronic properties, including reactivity, of particles varies significantly as size is reduced to the nanoscale. Studies have shown that properties like chemisorption and catalytic activity depend on particle size and number of atoms. The reactivity of very small clusters, even when supported, relates to their distinct electronic structure based on atom number. Particle shape, support interactions, and alloy composition also influence catalytic properties at the nanoscale.
This document analyzes the strain hardening behavior of an Fe-22wt.% Mn-0.6wt.% C twinning-induced plasticity (TWIP) steel under tensile deformation. Electron channeling contrast imaging (ECCI) combined with electron backscatter diffraction (EBSD) is used to characterize the evolution of dislocation and twin substructures. The analysis reveals that strain hardening occurs in five stages with different rates that are correlated to the refinement of the dislocation and twin substructures. At high strains, limited further refinement of these substructures reduces strain hardening capabilities.
This document discusses a study investigating the irradiation performance of high entropy alloys (HEAs) for nuclear reactor applications. Researchers fabricated single-phase FCC and BCC HEAs and conducted in situ ion irradiation experiments coupled with transmission electron microscopy. Preliminary results found lower defect cluster densities in the HEAs compared to less complex reference materials after irradiation at 50K. However, the effect on defect mobility was unclear as one FCC HEA showed faster loop growth than another at 773K. Overall compositional complexity in HEAs may reduce defect accumulation but also influence kinetics in complex ways depending on composition. High-throughput methods are needed to better understand irradiation effects across many HEA compositions.
Point defects such as vacancies and self-interstitials are common imperfections in crystalline solids that occur during processing or from applied stresses. Vacancy concentration can be calculated using statistical mechanics and is proportional to exp(-ΔHf/kT), where ΔHf is the enthalpy of vacancy formation. Dislocations are linear defects that enable plastic deformation through slip processes. They allow metals to deform with only minor bond breaking, providing both strength and ductility. Grain boundaries introduce discontinuities that impede dislocation motion, strengthening materials according to the Hall-Petch relationship as grain size decreases.
This document discusses texture formation processes in metals and alloys, including deformation, annealing, and transformation textures. It focuses on deformation textures and the mechanisms of slip and twinning. The key factors that determine the dominant deformation mechanism are crystal structure and stacking fault energy. Materials with high stacking fault energy deform primarily through slip, while those with low stacking fault energy experience more twinning. The document also examines differences in slip systems for BCC, FCC, and HCP crystals and how deformation leads to the development of crystallographic texture through grain rotation.
The document discusses phase transformations in solid metals and alloys. It provides contact information for Dr. Muhammad Ali Siddiqui of NED University of Pakistan who teaches a course on this topic. It then lists several recommended textbooks on phase transformations and diagrams before outlining the topics that will be covered in the lecture series, including diffusion mechanisms, phase diagrams, and the classification of phase transformations.
Rosa alejandra lukaszew a review of the thin film techniques potentially ap...thinfilmsworkshop
This document discusses thin film techniques that could be applicable for superconducting radio frequency (SRF) cavities. It reviews various thin film deposition methods like sputtering, evaporation, and ion beam assisted deposition. Challenges in achieving high quality niobium films for SRF cavities are discussed, including issues like adhesion, purity, defects, grain size, stress. The document provides background on thin film nucleation and growth processes. It also summarizes some previous work done on niobium thin films at the College of William and Mary using DC magnetron sputtering and reactive sputtering.
Rosa alejandra lukaszew a review of the thin film techniques potentially ap...thinfilmsworkshop
SRF is a surface phenomenon where only ~10 penetration depths are needed (l=40 nm for niobium), thus it has been recognized for some time now that it would be economically convenient to use thin film coated cavities. But problems arise with defects within 1 or 2 l of the surface or on the surface, and insufficient attention has been paid to this topic, including trapping of impurities like oxygen in defects as well as surface roughness enabling magnetic field pinning sites. Earlier attempts at CERN applied standard sputter PVD methods, but the grain size for the CERN Nb/Cu films was 100 nm, which is 10,000 times smaller than for conventional SRF cavities with the ensuing problems that appear at grain boundaries. Thus, these prior attempts showed higher surface resistance and worst Q-slope than bulk. I will review more modern approaches using higher energetic PVD methods for thin film deposition which offer promise to achieve thin films with improved superconducting performance.
This document provides an overview of explosive welding on concentric cylinders. It discusses the explosive welding process, bonding interface, solidification at the weld zone, and applications. Explosive welding uses detonation of an explosive to accelerate one material into another, causing plastic deformation and bonding without melting. It can join many dissimilar metals and produces a weld joint stronger than the base metals. However, it is limited to simple geometries like flat or cylindrical surfaces. Applications include heat exchangers, pressure vessels, and repair of heat exchanger tubes.
chapter 3 - Crystal structures and imperfections.pptxEliharialeo
1. There are three main types of crystal imperfections - point defects, line defects, and interfacial defects. Point defects involve atoms being missing or in irregular positions in the lattice. Line defects are groups of atoms in irregular positions known as dislocations. Interfacial defects are boundaries separating regions with different crystal structures.
2. Solid solutions form when solute atoms are added to a solvent metal and the crystal structure is maintained. Factors like atomic radius, electronegativity, and crystal structure determine if a substitutional or interstitial solid solution forms.
3. Dislocations are line defects that allow plastic deformation to occur when they move in response to stress. Their motion produces slip between crystal planes
This document discusses solidification processes and how they affect crystal structure and material properties. It covers topics like nucleation and grain growth during solidification, different crystal structures, the effects of imperfections and grain size, phase diagrams, and how heat treatments can modify material properties by changing the crystal structure.
This study experimentally investigates geometrically necessary dislocations (GNDs) and local mechanical property variations in the ferrite phase of dual phase steels. Electron backscatter diffraction measurements show GND densities are an order of magnitude higher near ferrite-martensite interfaces than in ferrite grains. Nanoindentation tests reveal local hardening of ferrite near interfaces. Detailed testing specifies the hardened interface region is typically 1.5 μm thick. A finite element model is developed considering graded hardness properties in the ferrite near interfaces, aiming to model macroscopic mechanical behavior based on microstructural properties.
50% Bainite, 50% Pearlite
Example 3
45
CCT Diagram for Eutectoid Carbon Steel
46
- CCT diagrams are used to predict the microstructure that forms during continuous cooling of steel from the austenite phase field.
- The diagram shows the temperature and cooling rate required to form different microstructures like pearlite, bainite or martensite.
- Faster cooling rates favor the formation of martensite while slower cooling rates allow diffusion controlled transformations like pearlite or bainite to form.
- For the given eutectoid steel, a continuous cooling rate of 50°C/s from the austenite phase field would result
Strain effect in the crystal structure causes enhanced catalytic effect which is very beneficial for different process. In this Presentation it is discussed how the strain is generated and what is its effect.
The document summarizes key concepts about the iron-carbon phase diagram and microstructures in steels. It describes the various phases in the Fe-Fe3C system, including α-ferrite, γ-austenite, δ-ferrite, and Fe3C cementite. It explains how the microstructure of steels, such as pearlite, depends on the carbon content and cooling rate. Phase transformations like the eutectoid reaction are also summarized.
Synthesis and Dielectric Characterization of Barium Substituted Strontium Bis...ijrap
The strontium bismuth niobate, SrBi2Nb2O9 (SBN) is a bismuth layered perovskite oxide
compound with potentially useful ferroelectric properties which offer several advantages such as fatigue
free, lead free, low operating voltages, relatively high Curie temperature; and most importantly, their
ferroelectric properties are independent of film thickness. These materials are also important for Fe-RAM
applications having large remanent polarization and low coercivity accompanied by high Curie
temperature for better performance and reliable operation. Present paper describes synthesis, dielectric
properties and impedance studies to reveal the important properties of barium substituted strontium
bismuth niobate, Sr0.85Ba0.15Bi2Nb2O9 in the system Sr1-xBaxBi2Nb2O9(x=0.15).
SYNTHESIS AND DIELECTRIC CHARACTERIZATION OF BARIUM SUBSTITUTED STRONTIUM BIS...ijrap
The strontium bismuth niobate, SrBi2Nb2O9 (SBN) is a bismuth layered perovskite oxide
compound with potentially useful ferroelectric properties which offer several advantages such as fatigue
free, lead free, low operating voltages, relatively high Curie temperature; and most importantly, their
ferroelectric properties are independent of film thickness. These materials are also important for Fe-RAM
applications having large remanent polarization and low coercivity accompanied by high Curie
temperature for better performance and reliable operation. Present paper describes synthesis, dielectric
properties and impedance studies to reveal the important properties of barium substituted strontium
bismuth niobate, Sr0.85Ba0.15Bi2Nb2O9 in the system Sr1-xBaxBi2Nb2O9(x=0.15).
Similar to A review of Strengthening and Deformation mechanism in High Entropy Alloy (20)
Road construction is not as easy as it seems to be, it includes various steps and it starts with its designing and
structure including the traffic volume consideration. Then base layer is done by bulldozers and levelers and after
base surface coating has to be done. For giving road a smooth surface with flexibility, Asphalt concrete is used.
Asphalt requires an aggregate sub base material layer, and then a base layer to be put into first place. Asphalt road
construction is formulated to support the heavy traffic load and climatic conditions. It is 100% recyclable and
saving non renewable natural resources.
With the advancement of technology, Asphalt technology gives assurance about the good drainage system and with
skid resistance it can be used where safety is necessary such as outsidethe schools.
The largest use of Asphalt is for making asphalt concrete for road surfaces. It is widely used in airports around the
world due to the sturdiness and ability to be repaired quickly, it is widely used for runways dedicated to aircraft
landing and taking off. Asphalt is normally stored and transported at 150’C or 300’F temperature
Supermarket Management System Project Report.pdfKamal Acharya
Supermarket management is a stand-alone J2EE using Eclipse Juno program.
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A review of Strengthening and Deformation mechanism in High Entropy Alloy
1. A review on Strengthening and
Deformation mechanism in High Entropy
Alloy
School of Minerals, Metallurgical and Materials Engineering
Indian Institute ofTechnology Bhubaneswar
1
Gurudev Singh
3. Introduction
• 5-13 Principle elements
• Composition of elements between
5% and 35%
• ∆H mix between -10kj to 5kj
• ∆S config > 1.5R
• Difference in atomic radii <6.6%
• Rely on maximization of
Configuration Entropy.
Previous Studies
4. Core
-
Effects
High Entropy Effect-
1) G=H-TS
2) Phase with high entropy is stable at
highT
3) Conventionally S ss > S IM
Sluggish Diffusion-
1) Difference in atomic configuration
lead to difference in local energy.
2)Trap in low energy region
3) Slowest element will be rate
determining.
Cocktail Effect
Properties are not just averaged
but also dependent on the inter
elemental reactions.
Lattice Distortion
1) Size difference leads to lattice
distortion.
2) Impedes dislocation and lead to solid
solution strengthening.
High Entropy
Alloys
Previous Studies
6. Lattice Resistance
Conventional Alloys-Only Solvent lattice produces lattice resistance, and solute atom contribute to SSS
In HEA- No as such concept of solute solvent, due to elemental size mismatch Lattice distortion is a core
effect
Thus, the lattice resistance in concentrated HEAs originates from the distorted lattice
7. Solid Solution Strengthening
• Interstitial solid solutions form by squeezing small
solute atoms into interstitial sites between the
solvent atoms.
• The invasion of the interstitial atoms deforms the
alloy’s lattice, leading to a local stress field that
impedes dislocation motion to strengthen the
alloy
Substitutional SSS Interstitial SSS
Where M = 3.06 is theTaylor factor, G is the shear modulus, c is the concentration of the interstitial solute, and Δε is the
difference in strains
8. • The mutual hindrance of dislocations to their motion
essentially requires higher applied stress to keep the plastic
flow continue compared to an ideal.
DISLOCATION STRENGTHENING GRAIN BOUNDARY STRENGTHENING
• The discontinuity of the slip plane from one grain to
another impediment of grain boundaries to dislocation
motion.
9. • Precipitation strengthening makes use of the declining second-phase solubility in the matrix
alloy with decreasing temperature to strength an alloy.
• Two-step heat treatment process i.e. firstly Solution-treated at an elevated temperature,
followed by aging at a lower temperature to precipitate out second-phase particles.
• The strengthening effect of precipitates essentially stems from their blockages to dislocation
motion.
Precipitation Strengthening
10. Enhancing Strength via SHORT RANGE ORDERING
HEA is energetically favorable to undergo short-range ordering (SRO), and the SRO leads to a pseudo-composite
microstructure, which surprisingly enhances both the ultimate strength and ductility.
For example, in bccTiZrHfNb HEA doped with 2 at.% oxygen.
• (Zr,Ti)-rich oxygen complexes.
• Changes the dislocation glide mode from planar slip to double cross slip leads to a simultaneous increase in
the tensile strength (by 48.5%) and ductility (by 95.2%)
• CSRO is defined by α, where
αij = 1 − Nij /NXj
• Where Ni j is the number of j-type atoms in the first nearest
neighboring around an i-type atom,
• N is the total number of atoms
• Xj is the atomic fraction
11. The CSRO regions are observed only in the fcc phase of
the present DP HEA
CSRO IN Fe50Mn30Cr10Co10
• Inverse FFT (IFFT) images of the FCC lattice
and CSRO regions.
• Evidence of CSRO regions in the FCC phase of
the sample annealed at 760 °C
• Close-up maps of Fe and corresponding binary map,
• Fe enrichment on alternating atomic planes.
• Solid white line: Fe-enriched; dashed white line: Mn-
/Co-/Cr-enriched.
Atomic-scale EDS composition map.
12. Strength and
Ductility
Composition
Effect
Effect of Mn Effect of Co Effect of Cr Effect of Al
Processing
Effect
Microstructural
Effect
Temperature
Strength
ductility
tradeoff
Discussed in Presentation -3
Strength and Ductility
13. Impact of the supplementary elements
• HighVEC lead to greater inter atomic forces
→ atoms arrange themselves into a more
closed packed structure i.e. FCC
• LowVEC lead to smaller inter atomic forces
→ atoms arrange themselves into a more
open structure i.e. BCC
14. 14
Effect of Fe (Substitution ofCo)
• Alloy= Fe60-xMn30Cr10Cox
• The substitution of Iron by Cobalt atoms leads to an increase of the
martensitic transformation temperature as Co content increases.
• Co contents smaller than approximately 3 at % the FCC-HCP
transition is completely inhibited.
15. 15
• CoCrFeNi alloy demonstrates the presence of a single
phase with the FCC lattice (a = 3.577 Å). Only one FCC
phase, with a slightly higher lattice parameter (a = 3.602
Å) is also found in the CoCrFeNiMn alloy.
• Dendritic Structure are formed.
• The yield strength of the CoCrFeNiMn alloy is 215 MPa in as-
solidified state and 162 MPa after annealing is slightly higher
than that of the CoCrFeNi alloy which is 140 MPa.
• Structure is FCC and strength is almost same
https://www.researchgate.net/publication/260014088_Effect_of_Mn_and_V_on_structure_and_mechanical_properties_of_high-entropy_alloys_based_on_CoCrFeNi_system
Effect of Mn andV
Note- Addition of V givesTetragonal structure and increases hardness significantly
16. • (FeNiCrMn)(100x)Cox (x ¼ 5, 10 and 20) alloys annealed at 850 C.
• All the investigated HEAs exhibit a single FCC phase in the as-
cast state.
• A Cr-rich sigma phase precipitates after annealing for the Co5
and Co10 alloys.The Co20 alloy remains a single FCC phase in
the as-annealed state.
• The hardness and yield strength increase while tensile ductility
decreases for the Co5 and Co10 alloys due to the precipitation
of hard yet brittle Cr-rich phase after annealing.
• For the Co20 alloy, the hardness and yield strength decreased
due to a more homogeneous distribution of constituting
elements and grain growth while the tensile elongation keeps
almost unchanged due to high phase stability.
Compositional Effect
Effect ofCo
17. (FeCoNiCrMn)100xAlx (x = 0–20 at.%)
• Al < 8%- solid solution alloy, single fcc region
• 8% < Al < 16% bcc phases begin to appear and both the
fracture and yield strength are drastically increased
• (Al > 16%), alloys consist of (disordered bcc)A2
precipitates embedded in an ordered B2 (ordered BCC)
matrix
Compositional Effect
Effect ofAlSubstitution
18. 18
Effect ofCo andCr (Substitution of Ni)
Increasing Co concentration increases
Strength
Increasing Cr increases strength at first
then decreases (Trend for E and G)
https://www.jmst.org/article/2020/1005-0302/1005-0302-48-0-146.shtml
21. Dislocation Mediated
TEM image of the deformed (CoCrNi)94Al3Ti3 alloy,
indicating the planar slip of dislocations along with
intersecting slip lines in two different {111} planes.
• In FCC structured HEAs deformation is highly
planar involving slip of ½〈110〉dislocations on
the {111} slip planes.
• In BCC structured HEAs motion of screw
dislocation with b = a/2 〈111〉.
• Cross-slip of screw dislocations is observed in
BCC HEAs
• In the low stacking fault energy (SFE) in these
FCC-structured HEAs often results in the
dissociation of perfect dislocations into Shockley
Partials.
• Lower SFE materials display wider stacking faults
and have more difficulties for cross-slip
22. Dislocation Movement in HEAs
∆𝐸𝐷𝐴= Local potential energy for a dislocation segment in DiluteAlloy,
∆𝐸𝐻𝐴= Local potential energy for a dislocation segment in HEAs.
∆𝐸𝑃𝑀= Local Peierls potential energy
∆𝐸𝐿𝐷= Energy contribution of lattice distortion
∆𝐸𝑒𝑒= Extra Activation Energy due to local arrangement of different lead to change in bonding energy, and lattice strain
energy.
Conclusion- Additional strengthening effect
in high-entropy.
23. Twinning Mediated
TEM micrographs showing the evolution of twins
with the true tensile strain in the CoCrFeMnNi
alloy
• Another most common way of deformation in the
metals and alloys aside from slipping is the
mechanical twinning
• A clear transition is observed in the materials from
dislocation slip to mechanical twins when material is
deformed at higher a strain values
• The material shows these mechanical twins
formation only at critical strain level
𝜏𝑡𝑤𝑖𝑛 =
𝛾
𝐹𝑏
+
𝑘𝑇
𝑑
𝜏𝑡𝑤𝑖𝑛 = CRSS, γ = SFE, F = fitting parameter,
b =Burgers vector, 𝑘𝑇 =Hall-Patch constant, d = grain size
24. PhaseTransformation Mediating Deformation
TRIP behavior is shown with FCC to HCP transformation in
FeMnCrCo alloy
• Transformation-induced plasticity (TRIP) → extends the uniform plastic ductility by delaying the onset of necking, →
increasing overall toughness of the material.
• In the case of FeMnCrCo alloy,TRIP behavior results in the FCC to HCP transformation thus increasing the overall
toughness
Alloy Transformation Behavior
Fe20Co30Ni10Cr20Mn20 Cold-rolled, annealed transforms
from FCC→HCP
Fe60Co15Ni15Cr10 Cold-rolled, annealed, and
water-quenched transforms from
FCC→ BCC
Co20Cr20Fe34Mn20Ni6 Cold-rolled, and tempered, plus
water-quenched transforms from
FCC→HCP
25. Stacking faults Mediated
Bright-field TEM images of dislocation structures and
stacking faults (SFs) in the precipitation-strengthened
FeCoNiCrTi0.2 alloy after deformed to a true strain of (a)
~2.5%, (b) ~10%
• In low SFE materials, Stacking fault mediated
transformation is observed.
• Stacking faults (SFs) are important two dimensional crystal
defect impacting the mechanical and deformational
behavior of materials
• Distance between two SFs can be considered as the mean
free path for dislocation movement
• SFs help the strength of alloys due to the development of
intersecting stacking-fault bands
• SFs can prevent the planar dislocation glide, resulting in the
cross slip of dislocations and high work hardening
26. Conclusion
• In FCC HEAs slip of ½〈110〉dislocations and in BCC HEAs motion of screw dislocation
with b = a/2 〈111〉describes the deformation mechanism.
• In the low stacking fault energy (SFE) in these FCC-structured HEAs often results in the
dissociation of perfect dislocations into Shockley Partials.
• The material shows these mechanical twins formation only at critical strain level. From
slip at low strain rates to twin at high strain rates.
• Phase transformation mediated transformation extends the uniform plastic ductility by
delaying the onset of necking
• In low SFE stacking fault mediated transformation is observed and mechanical
properties are determined by these stacking faults.
27. References
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