1983 Volume 47 Issue 7 Pages 555-560
In order to get information on the dislocation mechanism of the Bauschinger effect, the Bauschinger strain, γB(n), during compression after tensile prestraining was measured at room temperature in copper in a reversed-stress range of 0≤n≤1 (n=|τ⁄τp|; τ: the reversed stress at which γB(n) was measured, τp: the stress in prestraining at which the stress direction was reversed). The behaviour of increase of γB(n) for n≤∼0.5 (at an early stage of reversed straining) with the progress of work-hardening during prestraining was found to be different from that for n>∼0.5 (at a later stage of reversed straining), that is, the increase was linear over the deformation stages in prestraining I, II and III for n≤∼0.5, but it was rapid, slow and again rapid in stages I, II and III, respectively, for n>∼0.5. In spite of this behavior, however, an amount of γB(n) in a fixed value of n was given as a unique function of an amount of work-hardening, not depending on the specimen orientation. This fact implies that the Bauschinger effect is mainly controlled by the work-hardening phenomena during prestraining. The behaviour of increase of γB(n) with the progress of work-hardening was explained from dislocation structures formed during prestraining.
