研究了不同取样方向和应力集中系数(Kt)条件下6156铝合金的高周疲劳性能,并利用金相、透射和扫描电镜对合金的显微组织及断口进行了观察.结果表明,在同一应力水平条件下,取样方向对光滑试样和缺口试样的疲劳寿命影响甚微.光滑试样(Kt=1)的疲劳寿命大于缺口试样(Kt=3)的疲劳寿命,表明此合金有明显的缺口效应.第二相粒子在疲劳裂纹萌生过程中起关键作用,绝大部分裂纹都是在表面粗大粒子上或粒子/基体界面上萌生.
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