CAJ | 학술논문

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.
연구료항변폭피로재하작용하Al-Si-Mg합금적피로행위급미결구대기피로성능적영향.대항변피로재하작용하Al-Si-Mg합금적단축피로수명이급피로행위진행료연구.이용투사투사전자현미경관찰재항변폭재하조건하Al-Si-Mg합금중위착이급위착대적연변정황.결과표명,Al-Si-Mg합금적피로수명수변폭재하적변화이변화;위착결구재Al-Si-Mg합금중적운동구유일정적규률성.변폭가재조건회인기재료미결구발생변화, 사득재료적경화효과화변형행위표현출명현적차이, 종이영향료손상적연화진정,재료적피로수명강렬지의뢰우가재역사소도치적재료미관결구변화.
The effects of microstructural characteristics on the fatigue behavior in Al-Mg-Si alloy were researched. Fatigue tests were conducted to determine the influence of constant loading and variable amplitude loadings. The dislocation substructures of Al-Mg-Si alloy were observed by transmission electron microscopy (TEM). The fatigue life exhibits a variable behaviour with variable amplitude loading. Results show that the dislocation structures of Al-Mg-Si alloy have certain regularity in the movement. Additionally, the change of material's microstructure is caused by loading conditions; in this way hardening effect and deformation behavior of material show significant differences, thus affecting the damage evolution process. The fatigue behavior and uniaxial fatigue life are strongly dependent on material's microstructure which is caused by the loading history.