Ti-35Al-15V合金β相の相変態(I) : 電気抵抗測定による相変態過程の追跡

概要

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Transformation in quenched ft phase of a Ti-35at%aAl-15at%V alloy has been studied by electrical resistivity measurement. Temperature dependence of the resistivity was examined in temperature range from 50 to 920℃. With a rise in temperature, the resistivity decreased at lower than 300℃, while it increased in the range at 300 to 350℃. Resistivity change of the alloy by isothermal aging was examined at near 300℃. After an incubation period, the resistivity increased with elapsed time and then approached to saturation. These results suggest the metastable ft phase of the alloy happens a phase transformation at near 300℃. In addition, this transformation gives rise to a decrease in hardness of the alloy. This process is sensitive to a temperature change. The activation energy for this process is estimated based in its temperature dependence.
函館工業高等専門学校の論文