本文研究了两种合金成分及弥散相含量不同的Al-Mg-Si合金,在不同时效状态下的疲劳断裂行为。结果表明,弥散相对不同时效状态合金的疲劳断裂行为有明显的影响。弥散相通过影响合金的形变均匀性来改变合金的疲劳断裂方式,弥散相本身在疲劳循环应力作用下也与基体界面发生分离。
A study was made on the fatigue fracture behaviour under different aging cond-itions of two Al-Mg-Si alloys with different chemical composition and dispersoid contents.The dispersoid phase can alter the mode of fatigue fracture by the influence on the deformationuniformity of alloy. The dispersoid itself may decohere from the dispersoid/matrix interface undercyclic fatigue stress to form small-sized dimples.
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