Abstract Mechanism for diffusion of B in γ--Fe is believed to be mainly by means ofboron-vacancy complexes other than as interstitial atoms previously. This was made of calcula-tion on the basis of theoretical model proposed by the authors. The calculated diffusioncoefficient of B in γ--Fe after this mechanism is consistent with the experimental value. In addi-tion, this is also supported by the non--equilibrium segregation phenomenon of B at grainboundaries of γ--Fe and the lattice constant measurement of Fe--B alloy.
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