B7041
Total Pages: 1 Reg
No.:________ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, DECEMBER 2017
Course Code: me309

Course Name: NTTALLURGY AND MATERIALS SCIENCE (AU)

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any threefull questions, each carries 10 marks. Marks

1 a) Copper has an atomic radius of 0.128nm,an FCC crystal structure, and an atomic (4) ೪7೦191 of 63.5
g/mol.Compute its theoretical density.

b) What is meant by Miller Indices? Sketch (1 2 1) plane and [2 1 0] direction in (6) simple cubic

structure.
2 a) List the different mechanisms of plastic deformation. Explain anyone in detail. (5) b) Explain
Schmid's Law and term critical resolved shear s ffess. (5) 3 a) What is Interstitialcy? (2) b)

Explain Frank-Read Source. (6) c) Differentiate Jogs and Kinks. (2)

4 ೫) Describe the step by step procedure for metallographic specimen preparation. (6) b) State and
explain Fick's second law of diffusion. (4) PART B

Answer any threefull questions, each carries Z 0 marks.

5 9) Explain Hume-Rothery's rules for substitutional solid solutions. (6) 0) State Gibb's
phase Rule. What are its applications? (4) 6 a) Draw and explain Iron-Iron carbide phase
diagram. (8) b) Why martensite is hardest and strongest micro constituent in iron alloy (2)
sptem. Explain.

7 a) List out different strengthening mechanisms. Explain strain hardening in detail. (5) 0) Discuss
recovery, recrystallization & gram growth. (5)

8 2) Discuss the effects of alloying elements on the microstructure and properties of (8) steel.

b) What is Gun-metal? Explain its properties and applications. (2) PART C
Answer anyfourfull questions, each carries 10 marks.

9 8) Explain Griffith's theory of Brittle Fracture. (6) 0) Explain how a good design can resist fatigue
failure. (4) 10 a) What is Transgmnular Fracture and Inter granular Fracture? (4) b) Explain
Ductile-Brittle Transition in steel. (6) 11 a) Explain the mechanism of Fatigue Failure. What are
the factors affecting it? (7) b) Explain the role of thermal fatigue in metal cutting processes. (3)

12 a) What is an S-N curve? (2) b) What is creep? Explain its different stages? Give some
examples of creep resistant (8) materials.

13 a) What are composites? Explain any two different types with their specific (6) applications in
engineering.

b) What is meant by Maraging steels? (2) 0) List out features of super alloys. (2) 14a)

What is ceramic? What are the different applications of ceramic materials. (5) 0) Write short note on

Nano-materials and Optical Fibres. (5)