Control of Zinc Concentration and Growth Rate of Beta Phase in Copper-Zinc Alloy by Heating Pure Copper in Zinc Vapor

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  • Sasano Hisaoki
    Physical Properties Division, National Research Institute for Metals
  • Arai Hitoshi
    Physical Properties Division, National Research Institute for Metals
  • Suzuki Toshiyuki
    Physical Properties Division, National Research Institute for Metals

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Other Title
  • 亜鉛蒸気中加熱による銅中の亜鉛濃度とβ相の成長速度の制御
  • アエン ジョウキチュウ カネツ ニ ヨル ドウ チュウ ノ アエン ノウド ト

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Abstract

We attempted to precisely control the zinc concentration in copper alloys by regulating the heating temperatures of pure copper and the molten zinc source placed in a closed vessel independently.<BR>In this experiment, the diffusion phenomena in a solid copper-zinc vapor diffusion couple were investigated. The results obtained are as follows: (1) The smaller was the difference in heating temperature between copper plates and molten zinc more zinc diffused into the copper plate. (2) The zinc concentration on the surface of the copper plates laid only in the single alpha, beta and gamma phase regions in the copper-zinc binary phase diagram and kept constant values even when the heating time changed. (3) It was found that the activity of zinc in copper depended on the temperature. (4) The interdiffusion coefficient in the beta phase was about 500 times larger than that in the alpha phase, and the growth rate of the beta phase layer formed on the surface was mainly controlled by the diffusion rate of zinc in the beta phase.

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