运用原子力显微镜(AFM)对形状记忆合金CuNiAl中裂纹扩展行为进行了观察.观察表明,拉伸时,裂纹尖端首先产生马氏体,纳米微裂纹择优沿马氏体相界面形核.但当外力较大,且裂纹扩展距离较长使裂尖应力集中足够大时,不但能诱发马氏体相变,也可出现滑移带.一旦出现滑移带,裂纹也可沿马氏体或滑移带交替扩展.
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