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.
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