帯熔融精製銅の微小硬さについて

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  • Vickers Microhardness of Zone Refined Copper
  • タイヨウユウセイセイ ドウ ノ ビショウ カタサ ニ ツイテ

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The effect of the purity of copper on the Vickers microhardness under a light load of 50 g and its dispersion has been studied with zone-refined polycrystalline copper wires. The results obtained are as follows: (1) The mean values of microhardness measured at 100 points do not depend upon the purity of wires used, but their dispersions become smaller as the purity increases. The standard deviation for the full-annealed 99.999+% specimen is 1.74. (2) With increase of the purity of the specimens, the dispersion of grain-boundary hardness is decreased and the tendency is nearly similar to the dispersion of grain hardness. (3) Comparing the mean values of grain-boundary hardness with grain hardness, it is ascertained that the former is smaller than the latter if the purity of the specimens is 99.999 per cent or more.

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