Abstract
In this paper the results of an investigation of the structure and mechanical properties of age-hardened and heavily deformed Cu-0.4wt.%Cr alloy are presented. It was found that the structure and shape of the σ0.2vs.εr curve is strongly influenced by the dispersion of second-phase particles. The presence of small, highly dispersed particles causes the development of a uniformly distributed dislocation structure as a result of retarding the rearrangement dislocation process. The development of this structure leads to a passive dislocation background and causes the localized flow bands to take the main role in the deformation. As a result a step-like σ0.2vs.εr curve in which each step on the curve corresponds to the formation and development of one-band family is obtained. For a low dispersion of particles the recovery process leads to a cellular dislocation structure and to partition of the strain between the cellular dislocation background and the bands. In the latter case the σ0.2vs.εr curve is smooth. The appearance of localized flow bands causes a rapid decrease in the strain-hardening rate.
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