25 SUMMER 2010 MATERIALS SCIENCE AND ENGINEERING Time: Three hours Maximum marks: 100 Answer FIVE questions, taking ANY TWO from Group A, ANY TWO from Group B, and ALL from Group C. All parts of a question (a, b, etc.) should be answered at one place. Answer should be brief and to-the-point and be supplemented with neat sketches. Unnecessary long answers may result in loss of marks. Any missing or wrong data may be assumed suitably giving proper justification. Figures on the right-hand side margin indicate full marks. Group A 1. (a) What are the Hume-Rothery rules? (b) What are the differences between Frenkel and Schottky imperfections? (c) ‘Most dislocations in crystals are mixed dislocation type’- Explain. (d) Why are the grain boundaries considered as high energy regions? (e) What is stacking fault?

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2. (a) Explain interstitial and vacancy diffusions. 4 (b) Explain Fick’s law for non-steady state diffusions. 6 (c) From Gibb’s phase rule, explain why a triple point is an invariant point. 4 (d) Why are cored structures developed during solidification? How are they Removed in case of an alloy? 6 3. (a) Describe changes in microstructures, with suitable sketches, when cooled slowly from austenite to room temperature, for (i) hypo-eutectoid plain carbon steels; (ii) Eutectoid plain carbon steels; and (iii) hyper-eutectoid plain carbon steels. 10 (b) A slowly cooled plain carbon steel shows pro-eutectoid ferrite to be 10% by we weight of the microstructure. What is the carbon percentage in the steel? 3 (c) Discuss the differences in shapes of tensile stress-strain curves for metals, ceramics and polymers. 7 4. (a) What are the differences between ductile and brittle fracture? (b) What is a slip system? Discuss the slip systems of FCC, BCC AND HCP Crystals. (c) Show a characteristics creep curve and describe three stages in creep deformation.

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Group B 5. (a) What is the difference between hardness and hardenability? (b) What are the difference between martempering and austempering? (c) Describe different methods of carburizing. (d) Discuss different stages of age-hardening treatment in aluminum alloys.

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6. (a) What are the applications of thermal sensors? (b) What are the super alloys? What are the applications of these alloys? (c) Why are ceramic materials generally brittle? (d) Discuss the stages of sintering of ceramic materials.

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7. (a) What is glass transition temperature?

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26 (b) What are the differences between thermoplasts and thermosets? 5 (c) What are the differences between chain growth and step growth polymerization? 5 (d) What is a composite material? Enumerate the difference between particle and fiber reinforced composite. 2-5 8. (a) What are the differences between conductors, semiconductors and insulators? Discuss in terms of energy band structure. (b) What are the differences between intrinsic and extrinsic semiconductors? (c) Write a short note on superconductivity. (d) What are the benefits of polymer matrix composites?

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Group C 9. Answer the following in brief: 10×2 (1) Draw the following crystallographic planes (221) and (101). (2) What are the differences between annealing twins and deformation twins? (3) What is the difference between impact toughness and fracture toughness? (4) What is Schmid’s law? (5) What are sessile and glissile dislocations? (6) What is the measure of ductility? (7) What is peritectic transformation? (8) Why is glass tempered? (9) What is the angle between the [011] and [101] directions in cubic systems? (10) In a Vicker’s hardness test, if the average length of diagonals is reported as 1.5 mm, calculate the VHN for a 30 kg load.

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Material Science and Engineering-Summer 2010.pdf

(a) What is glass transition temperature? 3 ... (6) What is the measure of ductility? (7) What is peritectic ... Material Science and Engineering-Summer 2010.pdf.

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