本文测试了三种显微组织的Ｔｉ３Ａｌ－Ｎｂ系合金的室温疲劳裂纹扩展速率．结果表明，初生α２相的体积分数、基体的晶粒尺寸、高温β转变产物的形貌以及静态屈服强度是影响材料的疲劳门槛值和裂纹扩展速率的重要因素；应力比的影响有着普遍的规律性．结合ＳＥＭ断口及裂纹扩展路径观察结果，对疲劳裂纹扩展行为进行了简单的讨论．
篢he room temperature fatigue crack growth rates fo the Ti3Al-Nb-Mo-Valloys with different microstructures by 3 regimes of heat treatment have been determined. The volume fraction of primary α2-phase,grain sizes of matrix, morphology of β-transformation products and static yield strength are the major factors influential in both the fatigue threshold and fatigue crack growth rate of the alloy. The effect of stress ratio on da / dN is consistent with that on the conventional materials. According to observations of SEM fractographs together with the fatigue crack growth rate measurements, a brief discussion on the fatigue crack propagation behaviour was made.
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