研究了含0.34%Hf DD6单晶高温合金在760℃下的低周疲劳行为,对其疲劳裂纹的萌生与扩展进行了分析.结果表明,含0.34%Hf DD6合金比含0.10%Hf的疲劳寿命稍有降低;其损伤以弹性损伤为主.疲劳裂纹萌生于试样表面、亚表面或试样内部后,先沿垂直应力轴方向扩展,后沿{111}面扩展.其断裂机制为类解理断裂.断口上有典型的疲劳条带.断裂组织分析表明,位错主要在基体通道中扩展,变形后期切过γ'相,形成滑移带.
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