Studies of Cr-Be Copper

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  • Cr-Be銅に関する研究
  • Cr-Be ドウ ニ カンスル ケンキュウ

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Abstract

Cr-Cu alloy is used as electrode materials for resistance welding. In this report, the effect of Be on the hardness and the electrical conductivity of Cr-Cu alloy is described. First, the specimens of Cu-Cr-Be ternary alloys containing different quantities of Cr and Be were prepared to detect their optimum composition. It was shown that these alloys present the most superior properties in the region of 0.05∼0.1%Be, 0.6∼0.9%Cr and balance Cu. At this composition, the electrical conductivity became more than IACS 80%, the hardness (RB) more than 80 and the tensile strength more than 50 kg/mm2. Ni, Ti, Ag, Al and P were added to the ternary alloy. The electrical or mechanical properties were unfavourably affected by these elements. The optimum heat treatment and the structural change of this alloy were determined on the specimens of representative composition. The critical temperature for solution treatment was considered to be 1,000°C. The most excellent properties were obtained by tempering at 450∼470°C after cold-working of 50∼90%.

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