I want to learn that do atoms or crystals dislocate in the plastic deformation of metals.
Yes (if I have interpreted your question correctly).
what about memory metal?
In a shape memory alloy phase transformation is utilized to return to a shape which existed before they were subjected to plastic deformation (via a thermally activated process). Typical example being NiTi (or Nitinol commerically), which is one of the alloys which can recover from enough plastic strain to be viable in various applications. So not really changing the underlying mechanisms for plastic deformation, but adding a twist to it.
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