Microstructure-based analysis of fatigue behaviour of Al-Si-Mg alloy

被引：27
作者：
Jiang Xiao-song [1 ]
He Guo-qiu [1 ]
Liu Bing [1 ]
Fan Song-jie [1 ]
Zhu Min-hao [2 ]
机构：
[1] Tongji Univ, Sch Mat Sci & Engn, Shanghai Key Lab D&a Metall Funct Mat, Shanghai 200092, Peoples R China
[2] SW Jiaotong Univ, Natl Power Tract Key Lab, Chengdu 610031, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2011年 / 21卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Al-Si-Mg alloy; dislocation; Mg(2)Si; secondary silicon phase; ALUMINUM-ALLOYS; CAST A356-T6;
D O I：
10.1016/S1003-6326(11)60734-6
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
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 alpha(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 Mg(2)Si 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.
引用
收藏
页码：443 / 448
页数：6
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