Abstract
The effects of mechanical twinning on both the tensile and compressive stress-strain behavior of Cu-4.9 at. pct Sn were investigated at 77, 193, and 298 K using polycrystalline specimens with a mixed - wire texture. In tension, twinning occurred mainly in the structure component while in compression it occurred preferentially in the component in agreement with the relevant Schmid factors for twinning. The volume fraction of twins was larger in the compression than in the tension specimens. The stressstrain curves in tension and compression differed significantly with the compression curves lying below the tensile curves. This difference can be rationalized in terms of the effect of twinning on the stress-strain behavior. The start of twinning is accompanied by a decrease in the work hardening rate, since at low strains twins tend to be parallel in any given region of the structure. At larger strains the tendency for twins to form on intersecting planes should act to increase the flow stress due to grain subdivision. Microhardness data obtained from twinned and untwinned regions of compression specimens support this hypothesis.
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