Cu-Zn-Al合金β_1相におけるベイナイト変態と平衡α相への相変態の温度依存性

概要

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The bainitic transformation and successive transformation to equilibrium α phase in metastable β_1 phase of a Cu-28.9at%Zn-6.1at%Al alloy were studied by electrical resistivity measurements and optical microscopy. These transformations were proceeded by isothermal aging at a temperature from 250 to 450℃ and the resistivity was measured during the aging. The process of bainite formation gives rise to an increase in electrical resistivity, while the transformation to equilibrium α phase corresponds to a decrease in the electrical resistivity. In both processes, transformation rate increases with increasing aging temperature. The transformation to equilibrium α phase is more sensitive to a temperature change than the bainitic transformation. The curves of resistivity change and optical microscopic observations indicate that the transformation to α phase starts before resistivity reaches the maximum value.
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