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本文用直流电阻法研究了时效对M_s点高于室温的工业纯Cu—Zn—Al合金热弹性马氏体转变的影响。若该合金从高温无序β相区淬火后立即在马氏体状态充分时效,则热弹性马氏体会发生稳定化,在升降温的电阻—温度曲线上,马氏体不再呈现热弹性正逆转变的特征;若该合金淬火后立即在β_1状态(母相状态)时效,则随着β_1状态时效时间的延长,合金马氏体的热弹性转变特性会逐步保持下来,其马氏体相变点和马氏体相对可逆转变量逐渐趋近一稳定值,在随后的热循环中它们变化很小.可以认为,马氏体态时效所引起马氏体的稳定化与马氏体的再有序化及过饱和空位的聚集等过程有关。
In this paper, the effect of aging on the thermoelastic martensitic transformation of industrial pure Cu-Zn-Al alloy with M_s point higher than room temperature was studied by DC resistance method. If the alloy is sufficiently aged in the martensite state immediately after quenching from the high temperature disordered β-phase region, the thermoelastic martensite will be stabilized and the martensite no longer exhibits thermoelasticity over the temperature-rising resistance-temperature curve If the alloy is aged in the β_1 state (matrix phase), the thermoelasticity of the alloy martensite will be gradually reduced with the aging time of the β_1 phase. The martensitic phase The change point of martensite and the relative reversible variable of martensite gradually approached a steady value, and they changed little in the subsequent thermal cycle. It can be considered that the martensite stabilization and martensite re-generation caused by martensite aging Sequence and supersaturated vacancies and other processes related to the gathering.