Crystal Imperfection Test – 1

1. High angle grain boundaries provide easy atom diffusion in a solid state.

2. Mechanical twins are commonly observed in _____ while annealing twins are observed in ______

3. Stacking fault energy of silver is _____

4. Which property is deteriorated by increasing grain boundary area?

5. A low angle grain boundary formed by an array of edge dislocations is referred to as ______ boundary.

6. A low angle grain boundary, formed by set of _______ dislocations, is defined as twist boundary.

7. Which one of the following, is not exhibited by atoms present in the free surface?

8. Grain boundary improves ________

9. Higher Stacking fault energy materials face more difficulty in cross slip and climb.

10. What is the stacking sequence for FCC structure?

11. What is the range of misorientation angle in high angle grain boundaries?

12. What is the most common etchant used to reveal the grain structure of aluminium alloys?

13. Nital etchant is used for revealing microstructure of _______