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M. TECH. DEGREE EXAMINATION, MODEL QUESTION PAPER – I First Semester

Branch: Mechanical Engineering Specialisation: Production and Industrial Engineering / Advanced Manufacturing and Production Management / Computer Integrated Manufacturing MMEPI 101 / MMECM 101 / MMEMP 101 - ADVANCED ENGINEERING MATERIALS AND PROCESSING (Regular – 2013 Admissions) Time: Three Hours

Maximum: 100 Marks (Answer all questions) Module -1

1. a. What is the attributes of directional non-direction bonding in properties? correlate the inter-atomic spacing with coefficient of thermal expansion and melting point. (5 marks). b. On the basis of hydrogen bond and structure, explain with neat sketches, the anomalous behavior of ice float on water. What are the attributes of ice floats on water to living species? (5 marks). c. Compute and compare the linear densities of the [110] and [111] directions for BCC (10 marks). d. Copper has an atomic radius of 0.128 nm (1.28A°), an FCC crystal structure, and an atomic weight of 63.5 g/mol. Compute its theoretical density and compare the answer with its measured density (5 marks). OR 2.a. Why ionic and covalent bonded materials exhibit bad conductors of heat and electricity. Describe the technical reasons for selecting water as a coolant with bonding and amu (5 marks). b. The surface energy of a single crystal depends on crystallographic orientation. Does this surface energy increase or decrease with an increase in planar density? Why? (5 marks). c. Compute and compare the linear densities of the [100], [110], and [111] directions for FCC (10 marks). d. A metal having cubic structure has a density of 2.6 g/cc, an atomic weight of 87.62 g/mol, and a lattice parameter of 6.0849 Å. One atom is assocated with each lattice point. Take Avogadro’s number as 6.02 x 1023 atoms/mol. Find the crystal structure of the metal? (5 marks).

Module -2 3. a. Determine the number of vacancies needed for a BCC iron crystal to have a density of 7.87 g/cm3. The lattice parameter of the iron is 2.866 × 10-8 cm (5 marks). b. Discuss the formation of intermetallics in Cu-Zn System with phase diagram (10 marks). c. Explain with neat sketches the effects of Ni, Mo, Co, Ti alloying elements in maraging steel (5 marks). d. Discuss the stoichiometric defect reactions in ceramics with suitable examples (5 marks). OR 4. a. Determine the number of vacancies needed for a BCC iron crystal to have a density of 7.87 g/cm3. The lattice parameter of the iron is 2.866 × 10-8 cm (5 marks). b. Discuss the attributes of intermetallic and laves phase and draw the crystal structures of MgNi2, MgCu2 and MgZn2 (10 marks). c. What are specialties of maraging steel? Explain the strengthening mechanisms of maraging steel (5 marks). d. Explain the stress strain behavior of ceramics (5 marks). Module – 3 5. a. In developing a super alloy for high temperature application how alloy chemistry can be judiciously employed to produce resistance for creep, corrosion and micro structural instability (10 marks). b. Explain the major phases of nickel-base alloys (10 marks). c. What is the maximum service temperature of molybdenum alloys in structural applications? What is TZM, narrate the applications (5 marks). OR 6. a. Explain in detail the effect of alloy elements and micro-structural effects in super alloys (10 marks). b. Explain in detail the super alloy strengthening mechanisms (10 marks). c. Enumerate the chemical composition, mechanical properties, and applications of different niobium and molybdenum alloys (5 marks).

Module – 4 7. a. Explain with neat sketch the Titanium sponge production (8 marks). b. Explain the different weld imperfections produced in fusion welding of titanium (12 marks). c. Refining of superalloys is often done with a combination of vacuum arc melting (VIM), electro-slag remelting (ESR) and vacuum arc remelting (VAR). Triplemelted stock is then processed by the combination of VIM/ESR/VAR, in that order. Explain why the induction-melted stock is subjected to electro-slag remelting prior to vacuum arc remelting, rather than the other way around (5 marks). OR 8. a. Explain the hardening mechanisms of the alpha and beta phase (12 marks). b. Explain the pickling of Titanium and its Alloys (6 marks). c. Describe the titanium closed die forgings and shear bands in forged blades (8 marks).

## Mahatma Gandhi University M.Tech Mechanical Engineering Sem 1 ...

Specialisation: Production and Industrial Engineering / Advanced Manufacturing .... Engineering Sem 1 Advanced Engineering Materials and Processing P-I.pdf.

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