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Surface:
If it's a free surface, the dislocation can penetrate through the surface easily, but, if it's a coating or oxide layer, it will be hard for dislocation to glid out of the surface
Grain boundary:
In discrete dislocation dynamic simulation, some authors take grain boundary as a impenetrable, such as a rigide wall, But in other papers, grain boundary was thought to be a penetrable wall.
So,Is there somthing or simillar property for us to derive.
As our body, we birth, grow up and dead? Wil the dislocation souce be the same process, if it’s so, what’s the detail process.
(1):the birth of dislocation source
There are many dislocation multiplication mechanism, such Frank-Read source, cross-slip mechanism, L-source. So the questions is that when will these mechanism become active, will the stress be the only criterion? IF so ,what determine the critical stress? Will this critical stress change with the deformation, how is this change?
(2):the evolution of dislocation source
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