1. TF The movement of dislocations within grains is nade easier when vacancy def

Question

1. TF The movement of dislocations within grains is nade easier when vacancy defects are 2. T The movement of dislocations within grains is made easier when nanoparticles are 3. TT Cold work resulits in work-hardening of the work piece. 4. TE The energy of cold work is stored in the grain boundaries rather than the slipped planes 5. TF When slip occurs in a polycrystalline material, the grains will each store equal amounts of residual stresse. 6. T/F When cold working occurs in a polycrystalline material, the grain size is usually changed

Explanation / Answer

1. True if vaccancy is present dislocations are much easier

2. False Movement of dislocation becomes tough if nano particles are present. Because if dislocations attempting to accommodate the loading to the system would be nucleated, there would not be a shear to drive these dislcoations

3. True. Cold work results in work hardening. Here the metal get strengthened by plastic deformation due to the movement of dislocations.

4. False- Energy of cold work is not stored in grain boundaries

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