Coimbatore Institute of Technology, Coimbatore
Department of Mechanical Engineering
21PM114 Materials and Metallurgy
Assignment -1 (Unit 1 & Unit 2)
Part-A
1. Define alloy. How many components are found in alloy? Give some examples.
2. Differentiate between substitutional and interstitial solid solution.
3. Define unit cell. What are the classification of the unit cell.
4. Define a crystal structure.
5. Distinguish between Schottky defect and frenkel defect.
6. Define density computation.
7. Differentiate between allotropy and polymorphism
8. Define phase. What different kinds of phases are possible.
9. What are cooling curves?
10. What is an equilibrium phase diagram? State the advantages of phase diagram.
11. What are called intermetallic phases?
PART-B
What is meant by crystal imperfections? Classify the crystal imperfections on the basis of the
geometry. Explain vacancy and impurity imperfections with a neat sketch. (13)
What are the factors affecting the solid solution strengthening? Explain in detail. (13)
Explain with a neat sketch recovery, recrystallization and grain growth. (13)
Define grain size and explain how it is measured? (13)
State Hume Rotherys rules for formation of substitutional solid solutions. (8)
Calculate the atomic packing factor SC (5)
Calculate the atomic packing factor for BCC (8)
Calculate the atomic packing factor for FCC (8)
Calculate the atomic packing factor for HCP. (8)
Differentiate between edge and screw dislocation with a neat sketch (13)