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采用快速凝固工艺制取了不同规格的Cu-24.9wt-％Zn-4.5wt-％AJ合金带材、并通过应力-应变曲线、电阻-温度曲线、光学金相、X射线衍射、扫描电镜和透射电镜等方法研究了该合金的形状记忆性能、组织结构特征及热处理的影响。结果表明:合金喷带原始组织是单一的β细晶(晶粒尺寸约20μm);经720℃10min水淬处理后晶粒长大到100μm左右,室温下为(β+M)组织时,可以获得最佳的形状记忆性能,且避免了粗晶脆化;在应变值ε≤8％时能实现完全的记忆回复;加载变形过程中,样品表面形成的马氏体和晶粒状浮雕具有可逆性。
The Cu-24.9wt-% Zn-4.5wt-% AJ alloy strips with different sizes were prepared by rapid solidification process. The stress-strain curves, electrical resistance- temperature curves, optical metallography, X-ray diffraction and scanning electron microscopy Transmission electron microscopy and other methods to study the shape memory properties of the alloy, the organizational structure and the impact of heat treatment. The results show that the original microstructure of the alloy ribbon is single β fine grain (grain size about 20μm). When the grain size grows to about 100μm after water quenching at 720 ℃ for 10min and (β + M) at room temperature, Get the best shape memory performance, and avoid the coarse grain embrittlement; when the strain value ε≤8% can achieve a complete memory recovery; loading deformation process, the sample formed on the surface of the martensite and grain embossed reversible Sex.