CAJ | 학술논문

研究Al-si-Mg合金的微结构对其疲劳性能的影响.利用透射电子显微镜观察不同条件下Al-si-Mg合金中位错的结构,对同一应力幅下不同循环周次试样的基体(011)面进行位错观察.结果表明,Al-Si-Mg合金的位错结构随应力幅的变化而变化,并具有一定的规律性;Mg2Si与二次硅相对位错运动具有强烈阻碍作用.材料的疲劳行为强烈地依赖于的材料的微观结构变化.
연구Al-si-Mg합금적미결구대기피로성능적영향.이용투사전자현미경관찰불동조건하Al-si-Mg합금중위착적결구,대동일응력폭하불동순배주차시양적기체(011)면진행위착관찰.결과표명,Al-Si-Mg합금적위착결구수응력폭적변화이변화,병구유일정적규률성;Mg2Si여이차규상대위착운동구유강렬조애작용.재료적피로행위강렬지의뢰우적재료적미관결구변화.
The effects of microstructural characteristics on the fatigue behavior in Al-Si-Mg alloy were investigated. The dislocation substructures of Al-Si-Mg alloy were observed by transmission electron microscopy (TEM). Dislocation evolution process of a(Al)matrix with [011] orientation of Al-Si-Mg alloy specimens was observed during fatigue process under different stress amplitudes and cycles. The results indicate that dislocation structure is closely dependent on stress amplitudes,and the density of dislocation in failure specimens increases with increasing stress amplitudes. The results show that Mg2Si and secondary silicon phase could have a strong hindrance effect on the movement of dislocations during the fatigue process. The fatigue behavior is strongly dependent on the microstructure of material.