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Activity and diffusivity measurements of copper in γ and δ Fe by equilibration between solid Fe and liquid Ag

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Abstract

The activities of Cu in solid Fe for 1323 <=T <= 1773 K have been determined by equilibrating the surface of initially pure Fe plates with liquid Ag-Cu alloys and by using the literature values of the Cu activity in Ag-Cu alloys. The equilibrations have been confirmed by the agreement of surface compositions between an initially pure Fe plate and an Fe-Cu alloy plate having more content of Cu than the surface concentration. The equilibrated Fe plates were essentially binary Fe-Cu alloys, because no Ag was detected by an electron probe analyzer in the Fe plates. Interdiffusivities in solid Fe-Cu alloys for the same temperature range have also been determined from penetration profiles of Cu in the plates. The ternary phase diagram for the Ag-Cu-Fe system at 1480 K has been determined from solubility measurements of Fe in liquid Ag-Cu alloys.

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Authors and Affiliations

  1. Department of Metallurgical Engineering, Tokyo Institute of Technology, Meguro-ku, 152, Tokyo, Japan

    M. Arita (Research Assistant), M. Tanaka, K. S. Goto (Professor) & M. Someno (Professor Emeritus)

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  1. M. Arita
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  2. M. Tanaka
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  3. K. S. Goto
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  4. M. Someno
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M. Tanaka, formerly at Tokyo Institute of Technology, is now with Clinap Industries, Tokyo, Japan.

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Arita, M., Tanaka, M., Goto, K.S. et al. Activity and diffusivity measurements of copper in γ and δ Fe by equilibration between solid Fe and liquid Ag. Metall Trans A 12, 497–504 (1981). https://doi.org/10.1007/BF02648548

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  • DOI: https://doi.org/10.1007/BF02648548

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