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Diffusion couples of Ni-Cr, which mean electrodeposited chromium on electrolytic Nickel, were studied. This paper describes the effect of temperature and duration for heat treatment on composition, stracture, hardness, etc. of the diffusion layer formed. The results were summarized as follows. These diffusion layers has already reached measurable at 600°C. It was showed that the nickel concentration was about 72% in diffusion layers at each heat treatment temperature. Diftusion layer showed grainboundary diffusion in the temperature range between 600-1000°C. The X-ray diffraction paterns and X.M.A. analysis revealed that the diffusion layer was a Ni rich solid solution. The results of hardness measuraments showed that the layer formed at low temperature was having hardness as Hk=350, and at high temperature was hardness as Hk=150.
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