Abstract
Numerous experimental observations have suggested that there is a higher dislocation density,i.e., a hard layer, in the near-surface region of a plastically deformed sample. In this study, we considered a dislocation model which could possibly account for this hard layer. A computer simulation investigation of a dynamic near-surface dislocation source operation resulted in the formation of a hard layer, 10 to 500 µm in thickness. This hard layer disappeared with time, at room temperature, when the stress was removed,i.e., relaxation. The relaxation time for Cu is approximately two weeks; for Fe-Si and Mo the relaxation time is 2.5 and 10 years, respectively.
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Arsenault, R.J., Hsu, R. Operation of near-surface dislocation sources. Metall Trans A 13, 1199–1205 (1982). https://doi.org/10.1007/BF02645502
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DOI: https://doi.org/10.1007/BF02645502