FexSi100-x(10≦x≦50)のメカニカルアロイングと加熱による相の変化

概要

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Mechanical alloyed mixtures of elemental Fe and Si powders with compositions FexSi100-x (10≤X≤50) have been characterized in the as-milled condition, as well as after heat treatments. Ball-milling in an argon atmosphere first induces alloying of the elements, followed by the formation of FeSi(ε) compound in the mixture of Fe50Si50, and FeSi2(β) compound in the mixture of Fe30Si70. Upon heating a Fe30Si70 mixture previously milled for 720ks, transformation to an almost single phase FeSi2 occurs, with the exothermic reaction at around 723K. The MA powders milled for 720ks, heated to temperatures between 1173K and 1273K and air cooled, exhibited the phases. expected from the Fe-Si phase diagram. A substantial enhancement of the (Fe2Si5(α) + ε) to β transition was observed in the MA powders of Fe30S70 composition in which the β phase formed from (α+ε) during furnace cooling from 1273K. This enhancement of the (α+ε) to β transition is considered to be due to the enhanced diffusion resulting from the refinement of grain sizes of the α and ε phases after MA.
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