The Effects of Pressurization on Yielding of a Copper–2.5% Indium–O.3% Lead Alloy

Abstract

Dislocations are generated near lead particles in a copper–2·5 at.-% indium–0·3 at.-% lead alloy by hydrostatic pressures of > 2 kbar (200 MN/m²). The yield point at atmospheric pressure becomes smaller with increasing pressurization and no yielding discontinuity is evident above 6 kbar (600 MN/m²). Pressurization above 2 kbar also increases the flow stress subsequent to yielding; this increment rises with increasing pressure. The yield point in this alloy probably does not result from the destruction of short-range order, because the yield point is removed by isolated clusters of dislocations in comparatively large regions of unyielded matrix.