利用轻气炮装置在不同加载速率下对Ni47Ti44Nb9形状记忆合金进行了动态冲击加载试验.采用差示扫描量热仪(DSC)、X射线衍射仪(XRD)和透射电子显微镜(TEM)等先进手段对样品的形变行为进行了分析表征.探讨冲击过程合金样品的物相转变机制和微观组织演化规律.结果表明:冲击后样品内部存在大量微观缺陷,NiTi基体相与β-Nb粒子相均发生了明显的形变,但未发生应力引发马氏体相变过程,这可能是由于Ni47Ti44Nb9合金马氏体相变温度较低以及β-Nb粒子对相变过程的阻碍作用引起的.
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