本文研究了层片状双相TiAl合金的室温拉伸压缩变形行为与断裂行为,发现在拉压变形条件下,其室温塑性有显著差异.并且这种差异与裂纹扩展路径有关.在室温拉伸与压缩变形时,该合金的拉压屈服应力随外载与层片界面间的夹角φ的变化趋势一致,而拉压断裂应变εf随夹角φ的变化趋势正好相反.外载与层片界面垂直时(φ=90°),拉伸断裂应变最小(εf≈0);压缩断裂应变最大(εf≈38%).夹角φ减小时,拉伸断裂应变增加,压缩断裂应变减小.在拉、压变形时裂纹的扩展路径不同.
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