Interdiffusion in the α Phase of an Fe–Sb System

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  • Interdiffusion in the α Phase of an Fe–Sb System

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Iron test pieces were diffusion-annealed at 973∼1223 K for 32.4∼1584 ks in an evacuated quartz ampoule containing powdered (100∼200 mesh) 50 wt%Sb–Fe alloy, consisting of α and ε phases, as an Sb vapor source. After annealing, cross-sections of the test pieces were analysed with an EPMA in order to determine the penetration of Sb.<BR>Each penetration curve was analysed by the Matano-Boltzman method to calculate the interdiffusion coefficients, \ ildeD. The activation energies for interdiffusion (\ ildeQ) were also obtained.<BR>The surface concentration of Sb in the test piece (αmax) at lower temperatures coincided approximately with the solubility limit reported in the phase diagram of the Fe–Sb system, while a significant deviation in solubility limit was found at higher temperatures. Fine alumina markers placed on the test pieces prior to diffusion remained on the surface after annealing, so that it is considered that Sb atoms diffuse predominantly into the α phase of this system. Each penetration curve except for 1223 K was similar to an error function curve for a particular \ ildeD value. The value of \ ildeD showed a relatively small dependence upon the Sb concentration at each temperature. There was a gap in the Arrhenius plot of \ ildeD owing to magnetic transformation. The activation energies for interdiffusion (\ ildeQ) obtained from the data at higher temperatures decreased with increasing Sb concentration from 249 kJ/mol for 1 at%Sb to 220 kJ/mol for 4 at%Sb. The activation energy for the impurity diffusion of Sb in iron (QSb*) was evaluated to be about 262 kJ/mol.

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