Vanadium V has a lattice constant of 0304 nm How many V unit

Vanadium (V) has a lattice constant of 0.304 nm. How many V unit cells are there in 1 mm ? (V is BCC, with an atomic radius of 0.136 nm and a density of 6.1 Mg m^-3) The grain size number of a material is 8. At a magnification of 55X, how many grains in a square inch of the material? 53 128 5.3 4 45 Choose the correct statement: BCC and FCC arc the most densely packed metallic structures BCC and HCP are the most densely packed metallic structures FCC and HCP are the most densely packed metallic structures MCP is the most densely packed metallic structures none of the above Assume that the diffusion coefficients of the metal Chromium Cr and Carbon (Fe) at temperature T are: D_c (T) and D_cr (T). Which ranking of diffusion coefficient

Solution

6: (b) is basically that of FCC copper with some of the copper atoms replaced by Tin atoms.

7: (a) 1/a^3 where a = lattice constant in mm.

8: 128 * 155^2 grains/in2 (Answer is not there in multiple choice)

Formula: N = 2^(n-1)=128 grains/in^2   155 reprents the magnification.

9: (c) FCC and HCP are most densely packed structure of atomic packing factor 0.74.