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研究了恒变幅疲劳载荷作用下Al-Si-Mg合金的疲劳行为及微结构对其疲劳性能的影响。对恒变疲劳载荷作用下Al-Si-Mg合金的单轴疲劳寿命以及疲劳行为进行了研究。利用透射透射电子显微镜观察在恒变幅载荷条件下Al-Si-Mg合金中位错以及位错带的演变情况。结果表明,Al-Si-Mg合金的疲劳寿命随变幅载荷的变化而变化;位错结构在Al-Si-Mg合金中的运动具有一定的规律性。变幅加载条件会引起材料微结构发生变化,使得材料的硬化效果和变形行为表现出明显的差异,从而影响了损伤的演化进程,材料的疲劳寿命强烈地依赖于加载历史所导致的材料微观结构变化。
The fatigue behavior of Al-Si-Mg alloy under constant amplitude fatigue loading and the effect of microstructure on its fatigue properties were studied. The uniaxial fatigue life and fatigue behavior of Al-Si-Mg alloy under constant fatigue loading were studied. Transmission electron microscopy was used to observe the evolution of dislocation and dislocation bands in Al-Si-Mg alloys under constant amplitude load. The results show that the fatigue life of Al-Si-Mg alloy varies with the amplitude-varying load. The dislocation structure has regularity in Al-Si-Mg alloy. The luffing loading condition will cause the material microstructure to change, which makes the material hardening effect and deformation behavior show obvious differences, thus affecting the evolution of damage. The fatigue life of the material strongly depends on the loading history of the material microstructure Variety.