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VTU Mechanical Engineering (Semester 4)
Material Science & Metallurgy
June 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Define the following lattice;
Unit cell.
Space lattice.
Atomic packing factor.
Coordination number.
4 M
1 (b) Calculate the volume of the zinc crystal structure unit cell by using the following data:pure zinc has the HCP crystal structure with lattice constant a-o.2665nm and c=0.4947,nm
4 M
1 (c) State and explain Fick's first law of diffusion
4 M
1 (d) What do you mean by crystalline immersion? Explain briefly point and scalar /line defects
8 M

2 (a) Compare the engineering stress and strain with the true stress and stress for the tensile test a low carbon steel that has the following test values :
initial diameter of specimen under 75kN load -12mm
4 M
2 (b) Derive the expression for critically resolved shear stress (CRSS)
4 M
2 (c) Describe the dislocation mechanism that enables a metal to be plastically deformed within fracture
6 M
2 (d) What do you mean by linear and non-linear elastic properties of a material ?Explain any four properties
6 M

3 (a) Define creep and explain a typical curve
6 M
3 (b) What is fracture? State the difference between ductile and brittle fracture
8 M
3 (c) State the factor that affect the figure strength of a metal. Explain them briefly
6 M

4 (a) State and explain Gibb's phase rule
4 M
4 (b) Explain homogeneous nucleation. Discuss the significance of critical radius of nuclei
8 M
4 (c) What is a solid solution? With suitable example, explain the different types of solid solution
8 M

5 (a) Define :
A phase in a material
A phase diagram
2 M
5 (b) Derive the level rule for the binary phase diagram of two metals A and B completely soluble in each other
4 M
5 (c) Write the equation for the following invarient reaction;enteric,pericctic,monoteric entecoid and periticoid. How many degree of freedom exist at invariant reaction points in binary phase diagram?
6 M
5 (d) Draw nearly Iron-carbon phase diagram and mark on it all salient temperature composition ,and phases
8 M

6 (a) Explain the steps to construct TTT diagram.draw a labelled sketch of TTT diagram for an eutectoid steel
10 M
6 (b) With neat diagrams ,explain briefly austempering an d martempering hear treatment process
10 M

7 (a) Discuss briefly about of alloying elements on properties of steel
10 M
7 (b) Explain with phase diagram modification of Al-Si Alloys
5 M
7 (c) Write a note on spherodial Graphite (SG)iron
5 M

8 (a) Coming soon
10 M
8 (b) Explain with a neat sketch production of MMC by using powder metallurgy process
10 M

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