On Mechanism of Induced Plastic Anisotropy of Polycrystalline Metals

Abstract

The experimental results concerning the plastic behaviour of metals along the strain path with a corner have demonstrated some common and fundamental features of the induced plastic anisotropy of polycrystalline metals, for example, the fading memory, the saturation property of prestrain effect and the delay effect. It is shown that the mechanism of the induced plastic anisotropy is closely related with the internal stress due to the interaction among grains of deformed polycrystalline metals and the common features are related closely with the internal stress. Computations using a simple mathematical model of polycrystal proposed in relation to the idea of internal stress show a very good qualitative agreement with the experimental results obtained from some typical strain paths by using a thin-walled tubular specimen of brass.