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采用金相、透射电镜、电阻——温度测试和应力——应变测试等方法研究了Ca—23.4at％Zn—9.6at％Al形状记忆合金的冷加工及其对性能的影响。该合金经700～800℃、10o分钟处理的冷变形能力可达50％以上。冷变形量增加使Ms、As温度下降,出现晶格扭曲、晶面滑移、位错和嵌镶块等变形特征,电子衍射花样由单晶衍射斑点演变成不连续的多晶环。40％冷变形合金经700℃、2分钟处理后晶粒得到最佳细化(晶粒尺寸由～1 mm细化到0.2～0.3mm),合金的记忆性能也明显改善,实现完全回复的可逆应变值由4％增加到5％,相变屈服应力也有所提高。Cu—23.4at％Zn—9.6at％Al合金是一种可进行冷加工变形的合金,并可籍此达到细化组织和改善性能的目的。
The cold working of Ca-23.4at% Zn-9.6at% Al shape memory alloy and its effect on the properties were studied by means of metallographic examination, transmission electron microscopy, resistance-temperature test and stress-strain test. The alloy by 700 ~ 800 ℃, 10o minutes processing cold deformation capacity of up to 50%. As the cold deformation increases, the temperature of Ms and As decreases, and the deformation features such as lattice distortion, crystal plane slip, dislocation and embedded chunks appear. The electron diffraction pattern changes from single crystal diffraction spot to discontinuous polycrystalline ring. 40% cold deformation alloy after 700 ℃, 2 minutes to get the best grain refinement (grain size from ~ 1 mm thinning to 0.2 ~ 0.3mm), the memory performance of the alloy is also significantly improved to achieve full recovery of reversible Strain value increased from 4% to 5%, the phase transition yield stress also increased. The Cu-23.4at% Zn-9.6at% Al alloy is an alloy that can be cold worked and deformed to achieve the purpose of refining the texture and improving the performance.