Relationship between work-hardening exponent and load dependence of Vickers hardness in copper
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Micro-Vickers hardness measurements were conducted on pure copper under cold-worked and annealed conditions at loads ranging 0.147 to 9.8 N as well as tensile tests. Characteristics of the load dependence of the Vickers hardness (Hv) of these specimens were compared with the work-hardening exponents,n, obtained through tensile tests. There was a trend that the slope of the load dependence of the hardness was larger in copper with a smallern. The slope,S, was a good measure for correlating withn, andn could be expressed asn=−0.293/S. The 0.2% offset stress σ0.2 and ultimate tensile stress σUTS were estimated by usingn determined from theS-n relation and the relations of Cahoonet al. and Tabor. The estimated σ0.2 and σUTS showed good coincidence with those obtained from tensile tests.
KeywordsPolymer Copper Tensile Test Tensile Stress Annealed Condition
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