摘要
The microstructure and properties of nanostructured Cu-13.2Al-5.1Ni shape memory alloy （SMA） were compared with those of initial coarse structure. The nanostructured Cu-Al-Ni ribbons were produced via rapid solidification using melt spinning technique. The structure and properties of both nanostructured and coarse-grain specimens were then characterized using XRD, SEM, AFM and DSC techniques. According to the obtained results, the nanostructured ribbons show one way shape memory effect. Besides, the formation of nanoparticles of γ2 （Cu9Al4） and the nanograins results in a significant decrease in the martensite-austenite transformation temperature. The produced nanostructure not only leads to a considerable increase in the recovered deformation but also results in the structure stability when it is subjected to deformation-recovery cycles.
比较了纳米Cu-13.2Al-5.1Ni形状记忆合金和初始粗晶结构合金的结构和性能。采用熔体旋淬技术,通过快速凝固制备纳米Cu-Al-Ni薄带。利用XRD、SEM、AFM和DSC等技术表征了纳米结构和粗晶样品结构及性能。结果表明,纳米结构薄带显示了单次形状记忆效应。另外,生成的纳米γ2(Cu9Al4)粒子和纳米晶粒导致马氏体?奥氏体相变温度显著降低。经过变形?回复循环后,所制备的纳米结构不仅导致回复变形量大幅增加,而且导致结构稳定性增加。
