What are the Burgers vector-dislocation line orientations for edge and screw dis

Question

What are the Burgers vector-dislocation line orientations for edge and screw dislocations? Explain the role that dislocations play in the plastic deformation of crystalline materials. Calculate the ASTM grain size number (n) for the grain structure shown in Figure 1. This grain structure was observed for power plant steam line, which had failed in service. The red arrows do not relate to your grain size calculation, but they do reveal the physical form of the materials deterioration preferential to the grain boundaries. N = 2^n - 1 Figure 1.

Explanation / Answer

1. Burger vector -dislocation line orientation for:

2. The plastic deformation of crystalline materials is caused due to the motion of large number of dislocations.

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