Interdiffusion in γ Solid Solution of the Ni–Mn Binary Alloy System

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  • Yokota Masaru
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
  • Harada Ryoichi
    Graduate School, Osaka University
  • Mitani Hiroyasu
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University

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  • Interdiffusion in γ Solid Solution of the Ni–Mn Binary Alloy System

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The interdiffusion coefficients, \ ildeD, in the Ni–Mn binary alloy system have been determined by the Boltzmann-Matano method in the temperature range between 1073 and 1323 K for various couples consisting of pure nickel and Ni-(10∼40) at% Mn alloys. Logarithm of \ ildeD increased linearly with the manganese content up to 35 at% Mn which was the upper limit of this experiment, while the activation energies and the frequency factors for interdiffusion decreased monotonously with manganese content. On the other hand, the intrinsic diffusion coefficients, DMn and DNi, have been determined mainly by using Darken’s relation, showing that the diffusion of manganese atoms was twice or three times as fast as that of nickel atoms at the chemical composition of 19.7±0.4 at% Mn. Furthermore, the intrinsic diffusion coefficients, DMn and DNi, have been determined by using Dayananda’s thermodynamical analysis, showing that the results were smaller than those obtained by Darken’s analysis. Atomic mobilities, Gi, were also calculated from Dayananda’s method; GMn was twice or three times larger than GNi at the temperature range between 1173 and 1323 K.

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