Cu-Zn-Al合金における連続した3つの相変態の組成依存

概要

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Composition dependence of successive three phase transitions in Cu-Zn-Al alloys was studied. The phase transitions were traced by electrical resistivity measurement and confirmed by texture observation. Depending on the specimen composition, three types of resistivity curve were obtained. One has one maximum, another has one maximum and one minimum, and the other increases monotonically with isothermal heattreatment time. Whichever the type of electrical resistivity curve is, the phase transitions take place in the following order; (a): β_1 phase→bainite phase, (b): bainite phase→α phase, (c): β_1 phase+α, phase→(α+γ) phase. Based on the morphological changes, the formula of resistivity curve was derived. Applying that formula to the obtained resistivity curves, individual transition sequence curve in successive three phase transitions was obtained. The activation energy, E, and the frequency factor, k_0, for each transition were obtained by analyzing the temperature dependence of transition sequence curves.
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