Mechanical Metallurgy Practice Test 3

1. The stacking fault energy of aluminium is 200 mJ m^-2. Find the equilibrium spacing between partial dislocation of aluminium. If the shear modulus of the material is 27 GPa and lattice parameter is 3.57 A°.

2. If there are 40 grains in 1 mm² at 100X, how many grains were there in the actual grain of 1 mm² of the surface?

3. Shockley dislocation is which type of dislocation?

4. The dynamic strain aging is not associated with _______

5. In the Frank-Read dislocation source, if the distance between fixed points is L, then the minimum possible value of dislocation loop radius will be equal to__________

6. The solubility limit of copper in zinc is much higher than the solubility of zinc in copper.

7. The mean intercept method of grain size measurement ______________

8. Edge dislocation moves slowly in a crystal compared to a screw dislocation of same burger vector.

9. The chemical composition of θ’ is _______

10. After the strain ageing of the material, the _________