On the Plastic Deformation of Copper Single Crystals. Part 1. Two Stages in the Progress of Deformation

Abstract

The stress-strain curves of copper single crystals have been obtained at room temperature. When the resolved shear strain reaches about 20 percent, the stress increases rather rapidly with increasing strain and thus the progress of deformation is found to be made of two stages. This change in the nature of work-hardening may be explained from the view of the presence of two types of strains inside work-hardened metals that has been discussed in the previous paper (J. Phys. Soc. Japan 6 (1951) 90). If this view is correct, the number of stopped dislocations is expected to show rapid increase in the second stage of deformation.