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形状记忆合金的应用开发异常活跃。然而,对于环境温度超过100℃的所谓高温应用,却涉及较少。本实验研制了成分为Cu-13Al-2.81Ni(wt%)的铸造合金,其转变温度均大于100℃。淬火后的试样在180℃停放30天,相应进行电阻温度回线测室、X衍射实验及透射电镜观察。实验结果表明:合金于180℃时效,起初随着时效时间的延长,马氏体转变温度提高,而转变量基本不变;25天后,转变量急剧减少,转变温度下降。时效前后,X衍射图谱无明显变化。透射电镜观察到时效30天的样品内部出现大量的块状共格过渡相,该共格过渡相与马氏体结构一致、成分不同,阻碍马氏体的可逆转变。
Shape memory alloy application development exceptionally active. However, for so-called high temperature applications where the ambient temperature exceeds 100 ° C, less is involved. The experiment developed a composition of Cu-13Al-2.81Ni (wt%) casting alloy, the transition temperature is greater than 100 ℃. After quenching the sample was parked at 180 ℃ for 30 days, the corresponding resistance temperature loop test room, X-ray diffraction experiment and transmission electron microscopy. The experimental results show that the aging time of the alloy is 180 ℃, and the martensite transformation temperature increases at the initial aging time, but the amount of transformation is almost unchanged. After 25 days, the amount of transformation decreases sharply and the transformation temperature decreases. Aging before and after, X diffraction pattern no significant change. TEM observation showed that a large amount of bulk coherent transition phase appeared in the samples aged for 30 days. The coherent transition phase was consistent with the martensite structure and different composition, which hindered the reversible transformation of martensite.