Call Girls Delhi {Jodhpur} 9711199012 high profile service
MEE1005 Lecture4_Devaprakasam
1. DEVAPRAKASAM DEIVASAGAYAM
Professor of Mechanical Engineering
Room:11, LW, 2nd Floor
School of Mechanical and Building Sciences
Email: devaprakasam.d@vit.ac.in, dr.devaprakasam@gmail.com
MEE1005: Materials Engineering and Technology (2:0:0:2)
Devaprakasam D, Email: devaprakasam.d@vit.ac.in, Ph: +91 9786553933
3. Purpose of Engineering /Education/Research
Devaprakasam D, Email: devaprakasam.d@vit.ac.in, Ph: +91 9786553933
There are two important purposes and driving force
behind the Engineering/Education/Research:
1. Minimum consumption of Energy and Materials
without sacrificing the efficiency and functionality.
2. Maximum conversion of Energy from one form to the
other, to identify or design highly efficient process or
system.
4. Purpose of Engineering /Education/Research
Devaprakasam D, Email: devaprakasam.d@vit.ac.in, Ph: +91 9786553933
UNIT-I : Structure of Materials
Introduction to engineering materials – significance of structure property
correlations in all classes of engineering materials, Unit Cells, Metallic
Crystal Structures, Density Computations, Crystal Systems,
Crystallographic Points, Crystallographic Directions, Crystallographic
Planes, Linear and Planar Densities, Close-Packed Crystal Structures,
Crystalline and Non-crystalline Materials, Single Crystals, Polycrystalline
Materials, Imperfection in solids – Point, Line, Surface and Volume
defects - Polymorphism and Allotropy
24. Structure Property Correlations
Devaprakasam D, Email: devaprakasam.d@vit.ac.in, Ph: +91 9786553933
= mass/volume
= (atoms in the unit cell, n ) x
(mass of an atom, M) /
(the volume of the cell, Vc)
Density Computations
Atoms in the unit cell, n = 4 (FCC)
Mass of an atom, M = A/NA
A = Atomic weight (amu or g/mol)
Avogadro number NA = 6.023 1023 atoms/mol
The volume of the cell, Vc = a3 (FCC)
a = 2R2 (FCC)
R = atomic radius
Ac NV
nA
25. Structure Property Correlations
Devaprakasam D, Email: devaprakasam.d@vit.ac.in, Ph: +91 9786553933
Density of a crystalline material,
= density of the unit cell
= (atoms in the unit cell, n ) (mass of an atom, M) / (the volume of
the cell, Vc)
Density Computations Summarized
Atoms in unit cell, n = 2 (BCC); 4 (FCC); 6 (HCP)
Mass of atom, M = Atomic weight, A, in amu (or g/mol). Translate
mass from amu to grams divide atomic weight in amu by Avogadro
number
NA = 6.023 1023 atoms/mol
Volume of the cell, Vc = a3 (FCC and BCC)
a = 2R2 (FCC); a = 4R/3 (BCC)
where R is the atomic radius AcNV
nA