用透射电镜,X射线衍射仪和电阻法研究了Cu-14.84wt-％Zn-7.75wt-％Al形状记忆合金在直接淬火和分级淬火后马氏体的稳定性。试验结果表明,直接淬火和分级淬火(150℃,2min)后于室温时效约3h的马氏体均为M18R结构,但刚直接淬火后马氏体并不稳定,其某些衍射峰位置和电阻率均随室温时效而变化;而分级淬火(150℃,2min)后马氏体是稳定的,其所有衍射峰位置和电阻率几乎不随室温时效而变化。上述结果可用“马氏体再有序化机制”解释。
The stability of the thermoelastic martensite in a Cu-14.84wt-%Zn-7.75wt-%Al shape memory alloy with M_s=106℃ after direct quenching or steppedquenching has been investigated by using TEM, X-ray diffractometer and doubleelectric bridge instrument. The martensite aged for about 3h at room temperatureafter either direct quenching or stepped quenching (150℃, 2 min) is the structureof M18R. The martensite just directly quenched is not so stable, both its certaindiffraction peaks and specific electric resistivity change with aging at room tempera-ture; whereas it is stable after stepped quenching (150℃, 2min), and its diffractionpeaks and specific electric resistivity change no more with aging time at room temp-erature. The above mentioned results seem to be explained by the martensite re-ordering.
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