热循环对Cu-Zn-Al合金记忆效应的影响

INFLUENCE OF THERMAL CYCLING ONSHAPE MEMORY EFFECT IN Cu-Zn-Al ALLOYS

利用相变参数测量、变温金相观察、Ｘ－射线衍射等方法研究了热循环对Ｃｕ－Ｚｎ－Ａｌ合金马氏体相变和双向记忆效应的影响。热循环使合金相变点升高，可逆马氏体量减少，记忆性能衰减，滞后环宽度变窄。在组织结构上，伴随着热循环，合金有序度降低，并出现高度稳定的残留马氏体。使晶粒粗化，提高合金Ａｌ质量分数，适当提高约束加热训练温度均可改善合金抗热循环性能。

Effect of thermal cycling on the martensite transformation and two way shape memory effect (TWSME)in Cu-Zn-Al alloys in studied by means of transformation parameter measurement ,optical metalloscope observationand X-ray diffraction. As thermal cycling numbers increased, the transformation temperatures increased the re-versible martensite amount dereased, the TWSME declined and the width of transformation gysteresis ring becameare very stable. The properties of anti-thermal cycling of the alloys can be enhanced by enlarging grain size, increas-ing mass fraction of Al and properly raising the confined training temperature.