621 新仮説「核/縁組織内における拡散寄与型原子空孔の枯渇」の提唱(ワークショップ粉末成形・焼結の最前線)

概要

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The rate of peritectoid reactions such as FeSi(ε: core)+Fe_2Si_5(α: matrix) → 3FeSi_2(β: rim) in Fe-66.7at%Si alloy are well known to be generally extremely slow. Such extremely slow rate has been said to be because the reaction is a solid state reaction where atomic diffusion rate is extremely slow, or because the atomic diffusion distance of the reactant atoms from the matrix to the reaction interface of core/rim, i.e., the thickness of the rim increases with the progress of the reaction. On the other hand, we have proposed that such slow rate is supposed to be also due to the exhaustion of the diffusion-contributable vacancies in core/rim structure. In this report, the concept and applications of this hypothesis will be explained.
一般社団法人日本機械学会の論文
2001-11-02