Question

1-7 thanks in advance

1 - Answer the following questions on the attached answer sheet: 1. BCC materials have the following family of slip systems: a. (111)<110> b. (110) <111> C. (211}<110> d. (0001)<1120> 2- Slip is most likely to occur on: a. The most densely packed plane along the least densely packed direction b. The most densely packed plane along the most densely packed direction C. The least densely packed plane along the most densely packed direction d. The least densely packed plane along the least densely packed direction 3. It is possible to visualize dislocations and other internal features using a scanning electron microscope a. True b. False 4. No prior preparation is required to observe the microstructure of a sample using an optical microscope a. True b. False 5. The larger the magnification used a. The smaller the grain size number b. The larger the grain size number C. The grain size number does not change 6. Steady state diffusion occurs when: a. There is a constant diffusion flux b. There is a constant diffusion coefficient C. There is no more diffusion occurring d. None of the above 7. Fick's first law of diffusion states that: a. The diffusion flux is proportional to the rate of mass transfer b. The diffusion flux is proportional to the concentration gradient c. The concentration gradient profile is linear

Answer 1

1) The BCC materials have (110)<111> slip system. Because it is the plane along which deformation occur.

2) slip is most likely occur on most densely packed plane to the most densely packed plane. Because in this plane, the bonding of atoms are strong and hence prone to slip.

3)True, it is possible to visualize dislocation and internal features by scanning electron microscope.  

4)False, prior preparation is required to observe sample using optical microscope. Magnification should be set according to the grain size.

5) the smaller the grain size number

6) when there is a constant diffusion flux

7) diffusion flux is proportional to concentration gradient.