Dislocation arrays in Cu-Al alloys. II

Abstract
The dislocation arrangements in single crystals of Cu 2% at. Al and Cu 10% at. Al deformed into stage II of the work-hardening curve have been observed by transmission electron microscopy. The observations are described and discussed in relation to the theories of stage II work-hardening. It is concluded that the behaviour of Cu 2% at. Al is well described by the theory of Hirsch and Mitchell (1967) but that no theory exists to describe the stage II behaviour of an alloy such as Cu 10% at. Al deforming by planar slip. However, the main component of the flow stress in Cu 10% at. Al is the forest stress.