Abstract
Interdiffusion in γ solid solutions of the Fe-Mn system, was studied in the temperature range between 930° and 1250°C, using the diffusion couples of pure Fe and the alloy.
Interdiffusion coefficients \ ildeD were determined by the Matano analysis. At 930°C, because of the marked grain boundary diffusion, \ ildeD was impossible to be evaluated. And at 1010°C, it was noted that the dependence of \ ildeD on concentration differed from that in the higher temperature range, and in plotting \ ildeD against 1⁄T, \ ildeD deviated from the linearity in the same temperature range.
From the Arrhenius relationship, the activation energies \ ildeQ and the frequency factors \ ildeD0 for the interdiffusion in 5∼55%Mn alloys were calculated and it was shown that the results can be expressed as follows:
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The shifts of the Kirkendall marker showed that Mn atoms diffuse faster than Fe atoms in the vicinity of the 38%Mn composition.
