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MATERIAL SCIENCE QUESTION AND ANSWER Q-1: A-1: (CONVENTIONAL TYPE) What are coordination number of BCC, FCC and HCP crystal structure? CN, the coordination number, which is the number of closest neighbors to which an atom is bonded. CN of BCC structure is 8 CN of FCC structure is 12 CN of HCP structure is 12 BCC FCC HCP Q-2: A-2: What are packing factors of BCC, FCC and HCP crystal structure? APF, the atomic packing factor, which is the fraction of the volume of the cell actually occupied by the hard spheres. APF = Sum of atomic volumes/Volume of cell. APF of BCC structure is 0.68 APF of FCC structure is 0.74 APF of HCP structure is 0.74 Q-3: A-3: How many slip planes are there in BCC, FCC and HCP crystal structure? Crystal BCC FCC HCP Q-4: A-4: [1 2 0] Slip Planes {110}, {112}, {123} {111} Basal plane, Prismatic & Pyramidal planes Show crystalographic directions [1 2 0], [1 3 3], [1 1 0 0], [1 2 0] The length of the vector projection on the axis x, y and z respectably a/2, b, 0c Crystalographic Directions Page 1 of 14 [1 3 3] a/3, b, c [1 1 0 0] 0.866a, -0.866a, 0a, 0c [1 2 0] a/2, -b, 0c Page 2 of 14 Q-5: A-5: Show crystalographic planes [1 0 2], [2 2 1], [6 3 2], [10 1 0] Crystalographic Planes [1 0 2] [ 2 2 1] [632] [10 1 0] Plane ABCD Page 3 of 14 Q-6: A-6: Show Burger’s vector in edge and screw dislocations. Burger’s vector in edge dislocations Burger’s vector in screw dislocations Q-7: A-7: Why fine grained structure is harder t ...
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