JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II METALLURGY AND MATERIAL SCIENCE Previous Question Paper (November/December - 2017 - R16)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
PART- A
Find the packing efficiency in HCP lattice.
Answer
The packing efficiency of an HCP (Hexagonal Close Packed) lattice is calculated by the ratio of the volume of atoms in the unit cell to the total volume of the unit cell. For an HCP structure with an ideal c/a ratio of 1.633, the packing efficiency is 74%.
Lattice parameter of a FCC crystal is 3.61A0 calculate atomic density in (111), (110) and (100) planes.
Answer
Given the lattice parameter a = 3.61 Å, the atomic density (atoms per unit area) is calculated as follows:
- (111) plane: Density = 2 / (√3/2 * a²) = 2 / (0.866 * 3.61²) ≈ 0.177 atoms/Ų.
- (110) plane: Density = 2 / (√2 * a²) = 2 / (1.414 * 3.61²) ≈ 0.108 atoms/Ų.
- (100) plane: Density = 2 / a² = 2 / 3.61² ≈ 0.153 atoms/Ų.
What is the necessity of Alloying?
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Distinguish between Intermetallic Compound and Electron compound.
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What is congruent melting phase?
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Define allotropy and give examples.
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What is ASTM-grain size number? What is its importance?
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Distinguish between ordered and disordered solid solution.
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What is coring and how it can be minimized?
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What are the general requirements of a reinforcing phase?
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PART- B
What is an interstitial solid solution, name the five elements which commonly form interstitial solid solutions?
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What is a grain size? What is a fine grained and coarse-grained material?
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What is crystal system and explain the Brevais lattices?
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Write explanatory notes ASTM grain size measuring methods.
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Write a note on Transformations of solid state.
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Draw and explain the phase diagram where two components are completely soluble in both liquid and solid state with suitable examples.
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What is the effect of alloying elements on Fe-Fe3C diagram?
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Draw the TTT diagrams and explain the different cooling rates.
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What is hardenability and how it is measured?
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Differentiate between Hardening and Tempering.
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What is cast Iron and explain the classification of cast irons?
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Differentiate between Cu alloys and Al alloys with respect to properties, heat treatment, composition and microstructure.
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Draw and Explain the Cu-Zn phase diagram.
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Write short notes on Ti alloys.
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Enumerate the characteristics, properties and applications of Polymers.
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Write Short notes on:
Metal ceramic mixtures.
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C- Composites.
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