The document discusses optimizing the nucleation environment for cube grains in non-oriented electrical steel sheets through warm rolling parameters. Three key factors are needed: 1) enough initial cube grains in hot bands, 2) high warm rolling temperature to prevent shear banding that promotes the Goss texture, and 3) optimal warm rolling reductions to balance deformation bands for early-stage nucleation. With the right conditions, cube grains develop a quantitative advantage at sheet surfaces and center during partial recrystallization, leading to a dominant through-thickness cube texture after full recrystallization without requiring special initial microstructures or processes.
Effect of Biofield Treatment on Structural and Morphological Properties of Si...Mahendra Kumar Trivedi
The present study was undertaken to investigate the effect of biofield treatment on physical, atomic, and structural characteristics of SiC powder. The control and biofield treated SiC powder was analysed using X-ray diffraction (XRD), particle size analyzer, surface area analyzer, and Fourier transform infrared (FT-IR) spectroscopy techniques with respect to control.
Effect of Biofield Treatment on Structural and Morphological Properties of Si...albertdivis
Silicon carbide (SiC) is a well-known ceramic due to its excellent spectral absorbance and thermo-mechanical properties. The wide band gap, high melting point and thermal conductivity of SiC is used in high temperature applications. The present study was undertaken to investigate the effect of biofield treatment on physical, atomic, and structural characteristics of SiC powder.
Rosa alejandra lukaszew tests of the gurenvich odel toward larger field gra...thinfilmsworkshop
SRF properties are inherently a surface phenomenon involving a material thickness of a few microns thus opening up the possibility of using thin film coatings to achieve a desired performance. I will describe our experimental attempts to test the superconducting/insulating/superconducting (SIS) multilayer model proposed by A. Gurevich [1] to shield the bulk of the cavity from vortex penetration and hence enable larger accelerating fields than presently possible.
Effect of Biofield Treatment on Structural and Morphological Properties of Si...Mahendra Kumar Trivedi
The present study was undertaken to investigate the effect of biofield treatment on physical, atomic, and structural characteristics of SiC powder. The control and biofield treated SiC powder was analysed using X-ray diffraction (XRD), particle size analyzer, surface area analyzer, and Fourier transform infrared (FT-IR) spectroscopy techniques with respect to control.
Effect of Biofield Treatment on Structural and Morphological Properties of Si...albertdivis
Silicon carbide (SiC) is a well-known ceramic due to its excellent spectral absorbance and thermo-mechanical properties. The wide band gap, high melting point and thermal conductivity of SiC is used in high temperature applications. The present study was undertaken to investigate the effect of biofield treatment on physical, atomic, and structural characteristics of SiC powder.
Rosa alejandra lukaszew tests of the gurenvich odel toward larger field gra...thinfilmsworkshop
SRF properties are inherently a surface phenomenon involving a material thickness of a few microns thus opening up the possibility of using thin film coatings to achieve a desired performance. I will describe our experimental attempts to test the superconducting/insulating/superconducting (SIS) multilayer model proposed by A. Gurevich [1] to shield the bulk of the cavity from vortex penetration and hence enable larger accelerating fields than presently possible.
Oxygen flux influence on the morphological, structural and
optical properties of Zn1xMgxO thin films grown
by plasma-assisted molecular beam epitaxy
S.C. Su a,b, Y.M. Lu a,c,*, Z.Z. Zhang a, B.H. Li a, D.Z. Shen a,
B. Yao a, J.Y. Zhang a, D.X. Zhao a, X.W. Fan a
aKey Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics,
Chinese Academy of Sciences, Changchun 130033, PR China
b Graduate School of the Chinese Academy of Sciences, Beijing 100049, PR China
c College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China
Received 14 November 2007; received in revised form 25 January 2008; accepted 26 January 2008
Available online 5 February 2008
Abstract
The Zn1xMgxO thin films were grown on Al2O3 substrate with various O2 flow rates by plasma-assisted molecular beam epitaxy (P-MBE). The
growth conditions were optimized by the characterizations of morphology, structural and optical properties. The Mg content of the Zn1xMgxO
thin film increases monotonously with decreasing the oxygen flux. X-ray diffractometer (XRD) measurements show that all the thin films are
preferred (0 0 2) orientated. By transmittance and absorption measurements, it was found that the band gap of the film decreases gradually with
increasing oxygen flow rate. The surface morphology dependent on the oxygen flow rate was also studied by field emission scanning electron
microscopy (FE-SEM). The surface roughness became significant with increasing oxygen flow rate, and the nanostructures were formed at the
larger flow rate. The relationship between the morphology and the oxygen flow rate of Zn1xMgxO films was discussed.
# 2008 Elsevier B.V. All rights reserved.
Keywords: Zn1xMgxO; P-MBE; Zn/Mg
1. Introduction
Recently, ZnO as a wide band-gap semiconductor with a large
exciton binding energy of 60 meV [1], has attracted more and
more attention for its potential applications in optoelectronic
devices [2,3]. To realize ultraviolet (UV) light emitting diodes
(LEDs) and lasers, one of key issues is the growth of
heterojunctions and quantum wells for confining electrons and
photons in the devices. Due to the similarity of the ionic radius
between Mg2+ (0.57 A) and Zn2+ (0.60 A) [4], the wurtzite
structure Zn1xMgxO thin films were extensively studied as
barrier materials for ZnO/ZnMgO quantum wells. Many groups
have successfully reported the growth of single wurtzite phase
Zn1xMgxOlayers [5–11], inwhichmaximumMgconcentration
is up to 49 at.%. We also have obtained the wurtzite structure
Zn1xMgxO thin film with Mg containing up to 30 at.% [12].
Most of these works were focused on the fabrication, structural
and optical properties. However, there are few reports about the
studies on the morphology controlling and growth mode for
Zn1xMgxO thin films until now, which were just important for
obtaining the Zn1xMgxO thin film with a smooth surface and
two-dimensional (2D) growth for the fabrication of the quantum...
5th REX&GG Presentation - Evolution of Ni during GBEBrian Lin
Presented at the 5th Recrystallization and Grain Growth Conference held in Sydney, Australia from May 5th to May 10th in the Symposia on Grain Boundaries.
effect of vanadium on PAG and mechanical properties in martensitic steelNitinKumar1360
To study precipitation behavior of vanadium-rich carbides formed during the reheating processes and its influence on the formation of ultra-fine grained austenite microstructure and mechanical properties have been systematically investigated in a high strength low alloy martensite steel.
reference
Gengwei Yang et al. Materials and Design 50 (2013) 102–107
Nanocoating GDZ is compared with Conventional YSZ coating for Hot Corrosion Resistance in presence of V2O5 and Na2SO4 salt which are formed at high temp in gas turbines.
Study on Processing and Mechanical Properties of nano SiCp reinforced AA7075theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors.
The International Journal of Engineering & Science would take much care in making your article published without much delay with your kind cooperation
Oxygen flux influence on the morphological, structural and
optical properties of Zn1xMgxO thin films grown
by plasma-assisted molecular beam epitaxy
S.C. Su a,b, Y.M. Lu a,c,*, Z.Z. Zhang a, B.H. Li a, D.Z. Shen a,
B. Yao a, J.Y. Zhang a, D.X. Zhao a, X.W. Fan a
aKey Laboratory of Excited State Processes, Changchun Institute of Optics, Fine Mechanics and Physics,
Chinese Academy of Sciences, Changchun 130033, PR China
b Graduate School of the Chinese Academy of Sciences, Beijing 100049, PR China
c College of Materials Science and Engineering, Shenzhen University, Shenzhen 518060, PR China
Received 14 November 2007; received in revised form 25 January 2008; accepted 26 January 2008
Available online 5 February 2008
Abstract
The Zn1xMgxO thin films were grown on Al2O3 substrate with various O2 flow rates by plasma-assisted molecular beam epitaxy (P-MBE). The
growth conditions were optimized by the characterizations of morphology, structural and optical properties. The Mg content of the Zn1xMgxO
thin film increases monotonously with decreasing the oxygen flux. X-ray diffractometer (XRD) measurements show that all the thin films are
preferred (0 0 2) orientated. By transmittance and absorption measurements, it was found that the band gap of the film decreases gradually with
increasing oxygen flow rate. The surface morphology dependent on the oxygen flow rate was also studied by field emission scanning electron
microscopy (FE-SEM). The surface roughness became significant with increasing oxygen flow rate, and the nanostructures were formed at the
larger flow rate. The relationship between the morphology and the oxygen flow rate of Zn1xMgxO films was discussed.
# 2008 Elsevier B.V. All rights reserved.
Keywords: Zn1xMgxO; P-MBE; Zn/Mg
1. Introduction
Recently, ZnO as a wide band-gap semiconductor with a large
exciton binding energy of 60 meV [1], has attracted more and
more attention for its potential applications in optoelectronic
devices [2,3]. To realize ultraviolet (UV) light emitting diodes
(LEDs) and lasers, one of key issues is the growth of
heterojunctions and quantum wells for confining electrons and
photons in the devices. Due to the similarity of the ionic radius
between Mg2+ (0.57 A) and Zn2+ (0.60 A) [4], the wurtzite
structure Zn1xMgxO thin films were extensively studied as
barrier materials for ZnO/ZnMgO quantum wells. Many groups
have successfully reported the growth of single wurtzite phase
Zn1xMgxOlayers [5–11], inwhichmaximumMgconcentration
is up to 49 at.%. We also have obtained the wurtzite structure
Zn1xMgxO thin film with Mg containing up to 30 at.% [12].
Most of these works were focused on the fabrication, structural
and optical properties. However, there are few reports about the
studies on the morphology controlling and growth mode for
Zn1xMgxO thin films until now, which were just important for
obtaining the Zn1xMgxO thin film with a smooth surface and
two-dimensional (2D) growth for the fabrication of the quantum...
5th REX&GG Presentation - Evolution of Ni during GBEBrian Lin
Presented at the 5th Recrystallization and Grain Growth Conference held in Sydney, Australia from May 5th to May 10th in the Symposia on Grain Boundaries.
effect of vanadium on PAG and mechanical properties in martensitic steelNitinKumar1360
To study precipitation behavior of vanadium-rich carbides formed during the reheating processes and its influence on the formation of ultra-fine grained austenite microstructure and mechanical properties have been systematically investigated in a high strength low alloy martensite steel.
reference
Gengwei Yang et al. Materials and Design 50 (2013) 102–107
Nanocoating GDZ is compared with Conventional YSZ coating for Hot Corrosion Resistance in presence of V2O5 and Na2SO4 salt which are formed at high temp in gas turbines.
Study on Processing and Mechanical Properties of nano SiCp reinforced AA7075theijes
The International Journal of Engineering & Science is aimed at providing a platform for researchers, engineers, scientists, or educators to publish their original research results, to exchange new ideas, to disseminate information in innovative designs, engineering experiences and technological skills. It is also the Journal's objective to promote engineering and technology education. All papers submitted to the Journal will be blind peer-reviewed. Only original articles will be published.
The papers for publication in The International Journal of Engineering& Science are selected through rigorous peer reviews to ensure originality, timeliness, relevance, and readability.
Theoretical work submitted to the Journal should be original in its motivation or modeling structure. Empirical analysis should be based on a theoretical framework and should be capable of replication. It is expected that all materials required for replication (including computer programs and data sets) should be available upon request to the authors.
The International Journal of Engineering & Science would take much care in making your article published without much delay with your kind cooperation
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
Water billing management system project report.pdfKamal Acharya
Our project entitled “Water Billing Management System” aims is to generate Water bill with all the charges and penalty. Manual system that is employed is extremely laborious and quite inadequate. It only makes the process more difficult and hard.
The aim of our project is to develop a system that is meant to partially computerize the work performed in the Water Board like generating monthly Water bill, record of consuming unit of water, store record of the customer and previous unpaid record.
We used HTML/PHP as front end and MYSQL as back end for developing our project. HTML is primarily a visual design environment. We can create a android application by designing the form and that make up the user interface. Adding android application code to the form and the objects such as buttons and text boxes on them and adding any required support code in additional modular.
MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software. It is a stable ,reliable and the powerful solution with the advanced features and advantages which are as follows: Data Security.MySQL is free open source database that facilitates the effective management of the databases by connecting them to the software.
6th International Conference on Machine Learning & Applications (CMLA 2024)ClaraZara1
6th International Conference on Machine Learning & Applications (CMLA 2024) will provide an excellent international forum for sharing knowledge and results in theory, methodology and applications of on Machine Learning & Applications.
Literature Review Basics and Understanding Reference Management.pptxDr Ramhari Poudyal
Three-day training on academic research focuses on analytical tools at United Technical College, supported by the University Grant Commission, Nepal. 24-26 May 2024
Development of Through-Thickness Cube Recrystallization Texture.pptx
1. Development of Through-Thickness
Cube Recrystallization Texture in
Non- oriented Electrical Steels by
Optimizing Nucleation Environment
G. SUDHAKAR
PHD(MATERIAL ENGINEERING)
2. 1. NON-ORIENTED electrical steels (NOES)
are widely used in iron cores with
alternating magnetic flux, such as
generators and motors.
2. The various fabricating methods of NOES
have been reported, including con-ventional
rolling and annealing, powder metallurgy,
selective laser melting, CVD, PVD, rapid
solidification, spray forming, hot dipping, strip
casting.
3. Cube texture has won a high degree of
attention not only in NOES but in grain-
oriented electrical steels (GOES).
4.Actually, cube is difficult to develop as a
dominant recrystallization texture in virtue of
the disadvantages of the size or quantity in the
early stage of recrystallization produced by the
conven-tional rolling method.
3. 1. some special methods were adopted for
cube recrystallization texture, including
using columnar-grained polycrystals as
starting material, cross rolling, skew
rolling, surface annealing, strip casting,
andphasetransformation.
2. the complex- ity of these methods induces
high cost of production or equipment
investment and limits large-scale industrial
application.
3. warm rolling is proved to be an effective
way to control recrystallization texture of
NOES, and it has been found that the
recrystallization texture is closely related
to the content of interstitial atoms (C, N)
and the process parameters of warm
rolling.
4. the warm rolling temperature at which
dynamic strain aging (DSA) occurs was
beneficial to the formation of shear bands
and further promoting the preferential
development of Goss recrystallization
texture in NOES
4. 1. when warm rolling at higher temperatures,
strongly positive rate sensitivity effectively
eliminates the shear banding tendency,
thus the nucleation can be promoted at
the interface of deformation bands or
deformed grains.
2. There are two kinds of boundaries of
deformation bands: grain boundaries and
transition bands in the interior of grains.
3. Because of the large misorientation within
rather small regions, grain boundaries and
transition bands have higher strain-stored
energy than those in the interior of
deformation bands and the nucleation
would be enhanced at these sites.
4. cube grains obtain a prominent number
advantage at both SSS and SPS layers in
the partially recrystallized state, and finally
develop the dominant texture through
sheet thickness after primary
recrystallization.
5. Development of Through-Thickness Cube
Texture
1. cube grains obtain a prominent number
advantage at both SSS and SPS layers in
the partially recrystallized state, and finally
develop the dominant texture through
sheet thickness after primary
recrystallization. There- fore, the formation
of through-thickness cube texture is
derived from the quantitative advantage
of cube nuclei at both SPS and SSS layers
under the superiority of locally low density
of cube nuclei.
On the Nucleation Environment at Shear
Bands
1. opti-mization of nucleation environment at
deformation bands is a more stable way for
the control of through-thickness cube
texture in the process of NOES production.
6. Effect of Warm Rolling on the Nucleation Environment of Cube Grains
Three critical factors need to be satisfied to optimize the nucleation environment of
cube grains in warm rolled NOES sheets:
1. enough initial cube or near-cube grains in hot bands as the origins.
2. The high warm rolling temperature to prevent the occurrence of DSA (Dynamic Strain Aging)
which promotes the shear banding tendency favorable to the Goss texture evolution,
3.optimum warm rolling reductions to balance the quantity and strain-stored energy of
deformation bands for their effective nucleation at an early stage of recrystallization.
Because of low strain-stored energy, the sites of the cube nuclei need relatively large strain
to supply sufficient activation energy for recrystallization.
4. Meanwhile, the number of remained cube micro-regions originated from hot bands will
gradually decrease under the heavy strain due to the characteristics of metastability of cube
orientation under deformation conditions in BCC alloys.
7. Fig. 1—Warm rolling microstructure and texture of Fe-2.1 wt pct Si sheets: (a) microstructure under 70 pct rolling reduction, (b) constant u2 = 45 deg section of ODFs at different layers
under 70 pct rolling reduction, and (c) orientation densities of main texture components at different rolling reductions.
Fig. 2—(a) Constant u2 = 0 and 45 deg sections of ODFs at S = 0.5 layer under 70 pct rolling reduction, (b) orientation densities of main texture components at different thickness layers under
70 pct rolling reduction, and (c) orientation densities of main texture components under different rolling reductions in Fe-2.1 wt pct Si sheets after annealing at 1123 K (850 °C) for 10 min.
8. Fig. 3—(a) Orientation image maps, (b) constant u2 = 0 and 45 deg sections of ODFs, and (c) number fraction and average grain size of main texture components
at S = 0 layer in Fe-2.1 wt pct Si sheets after annealing at 1273 K (1000 °C) for 10 min.
Fig. 4—(a) Orientation image maps and (b) local enlarged maps in Fig. 4(a) and corresponding u2 = 45
deg section of ODFs of cube recrystallized grains and surrounded deformed matrices in 7 pct recrystallized Fe-2.1 wt pct Si sheets.
9. Fig. 5—(a) Orientation image maps and (b) constant u2 = 0 and 45 deg sections of ODFs of recrystallized grains within different thickness layers in 44 pct recrystallized Fe-2.1 wt pct Si sheets.
Fig. 6—(a) Orientation image maps and corresponding constant u2 = 45 deg section of ODFs of cube recrystallized grains and surrounded deformed matrices and (b) orientations of
deformed matrices in Fig. 6(a) marked in the u2 = 45 deg section in 44 pct recrystallized Fe-2.1 wt pct Si sheets.
Fig. 7—(a) Area fraction and (b) number fraction of main texture components of recrystallized grains in 44 pct recrystallized Fe-2.1 wt pct Si sheets.
10. Fig. 8—(a) Orientation image maps and (b, c, d) corresponding local enlarged maps in Fig. 8(a) and constant u2 = 45 deg section of ODFs of cube micro-regions retained at (b, c)
transition bands and (d) grain boundaries and surrounded deformation bands at S = 0 layer of warm rolled Fe-2.1 wt pct Si sheets under 70 pct reduction.
11. Fig. 9—Schematic representation of the formation of through-thickness cube texture during primary recrystallization:
(a) warm rolling microstructure,
(b) formation of cube grains at the boundaries of deformation bands with orientation in Regions I and II in the early stage of recrystallization, and
(c) formation of cube texture after primary recrystallization.
12. •In the present work, the facilitating role of warm rolling on the formation and development
of cube texture is mainly achieved by inhibiting the nucleation of c and Goss grains.
Compared with rolling at room temperature.
•nucleation of c grains is obviously inhibited during recrystallization in warm rolled sheets
due to the insufficient strain-stored energy at c deformed grain boundaries. Compared with
warm rolling in the tem- perature range where DSA phenomenon occurs,
• the shear bands are effectively inhibited during warm rolling at high temperature
•The optimizing nucleation environment of cube grains also requires a reasonable
warm rolling reduction.
•When rolling at 773 K (500 °C) under 60 pct rolling reduction, the nucleation of
cube deformed micro-regions is retarded by relatively low strain-stored energy,
which is further weakened by dynamic recovery during rolling.
13. As rolling reductions reach up to 70 pct, a
considerable number of {001} 230 -{001} 13
and {223} 362 -{114} 481 oriented deformation
bands form at different thickness layers in
warm rolled sheets. These deformation bands
obtain enough activation energy by
accumulated plastic strain, while the quantity
of remained cube micro-regions gradually
decreases. With increasing of rolling
reductions to 90 pct, the strain-stored energy
of deformation bands increases with the
further accumulated plastic strain, whereas
the quantity of remained cube micro-regions is
insufficient. Consequently, it can be deduced
that the applied processing parameters are
responsible for both the sufficientquantity of
remained cube micro-regions and enough
strain-stored energy of deformation bands at
different Thickness layers in warm rolled
sheets, which provide the favorable nucleation
environment for cube grains, and thus for the
development of through-thick- ness cube
recrystallization texture.
14. •CONCLUSIONS
h i h i
A through-thickness cube recrystallization texture is successfully obtained in 2.1 wt pct Si
NOES after final annealing by designing the initial texture and the applied processing
parameters.
Cube grains mainly nucleate at the boundaries of (mainly identified at the interfaces of)
{001} 230 -{001} 130 and {223} 362 -{114} 481 oriented deformation bands.
The formation of through-thickness cube recrystalliza-tion texture
is attributed to the optimization of nucle- ation environment, featuring quantitative
advantage of cube nucleiat both SPS and SSS layers under the superiority
of locally low density of cube nuclei.
No special requirements for the initial columnar grains or twin-roll casting, as well as the
simple processing route of rolling and annealing,
are expected to provide an efficient and significantly cheap way to optimize texture
of NOES for large-scale industrial applications.