Plastic deformation occurs when the stress of graphite material exceeds the elastic proportional limit. The so-called plastic deformation means that the graphite material is no longer restored to its original shape after stress revocation.

Plastic deformation is irreversible, which is the expression of slip dislocations in graphite materials.

The premise of plastic deformation of graphite material is dislocation movement. If there are no dislocations, some dislocations should also be formed first.

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