ர 00000ME309121901 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: ME309
Course Name: METALLURGY AND MATERIALS SCIENCE
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 ஐ Obtain the atomic packing factor for FCC crystal structure. (4)

0) Sketch the following Miller indices in a cubic unit cell. (1 2 0), (0 1 0) and [1 0 1] (6)

2 ഒ) Copper has an atomic radius of 0.128 nm, an FCC crystal structure and an atomic

weight of 63.5 g/mol. Determine its theoretical density. (4)
b) Explain the mechanism of plastic deformation by slip and twinning. (6)
3 ஐ Give the significance of Frank Read source in dislocation. (4)

b) Differentiate edge dislocation and screw dislocation in relevance with Burger’s

vector. (6)

4 9) Compare SEM and TEM. (4)

b) State and explain Fick’s laws of diffusion. (6)
PART ‏جا‎

Answer any three full questions, each carries 10 marks.
5 a) Enumerate the Hume-Rothery rules for substitutional solid solution. (4)
b) Explain the changes in microstructure when a 0.6% carbon steel is cooled from (6)
austenite to room temperature.
6 a) Sketch the iron-carbon equilibrium diagram and explain the three invariant (6)

reactions in it.

b) Compare carburizing and flame hardening techniques of surface treatment. (4)

7 Explain the microstructure, properties and applications of different types of cast
iron. (10)
8 a) How does age hardening improve the strength of an aluminium alloy? (5)

b) Give the significance of adding alloying elements in steel. Explain the effects of

adding any four alloying elements in steel with their specific functions. (5)

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