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利用透射电镜（ＴＥＭ）原位拉伸在室温下对（１１０）［１１０］取向 Ｎｉ３ＡＩ合金单晶中裂纹的萌生与扩展进行了研究结果表明：裂纹沿之字形路径扩展且裂纹的总体扩展路径与拉伸轴平行迹线分析表明，首先激活的是（１１１）和（１１１）两个主滑移面上的滑移系；其后在 Ｓｃｈｍｉｄ因子为零的两个滑移面上的滑移系激活．为了解释所观察到的现象而建立了一个位错塞积模型位错应力场的计算表明，塞积位错列所产生的应力场导致了第二滑移系的启动，并使得裂纹扩展路径平行于拉伸轴的方向
The initiation and propagation of cracks in (110) [110] -oriented Ni3Al single crystal were investigated by transmission electron microscopy (TEM) in-situ tensile at room temperature. The results show that the crack propagates along the zigzag path and the total crack propagation path and Parallel trace analysis of the stretching axis shows that firstly the slip system on the two main slip planes (111) and (111) is activated; the slip system on the two slip planes whose Schmid factor is zero activation. A calculated dislocation stress field for a dislocated plug model to explain the observed phenomena shows that the stress field created by the plugged dislocation array leads to the activation of the second slip system and causes the crack propagation path to be parallel In the direction of the stretching axis