Influence of different casting processes on high cycle fatigue behavior of Mg-10Gd-3Y-0.5Zr alloy

被引：4
|
作者：
Mao, Jimei [1 ,2 ]
Liu, Wencai [1 ,2 ,3 ]
Li, Yanlei [1 ,2 ]
Wei, Guangling [1 ,2 ]
Zhang, Liang [1 ,2 ]
Zou, Wenbing [4 ]
Tian, Ying [4 ]
Wu, Guohua [1 ,2 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[3] Shanghai Light Alloy Net Forming Natl Engn Res Ct, Shanghai 201615, Peoples R China
[4] Shanghai Spaceflight Precis Machinery Res Inst, Shanghai 201600, Peoples R China
来源：
JOURNAL OF MATERIALS RESEARCH | 2016年 / 31卷 / 16期
基金：
中国国家自然科学基金;
关键词：
TENSILE PROPERTIES; MAGNESIUM ALLOYS; HEAT-TREATMENT; GD; MICROSTRUCTURE; IMPROVEMENT; MECHANISMS;
D O I：
10.1557/jmr.2016.221
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In this present study, the influence of different casting processes on high cycle fatigue behavior of Mg-10Gd-3Y-0.5Zr magnesium alloy was investigated by using porosity-free low-pressure sand-casting (LPS) bars and gravity permanent mold casting (GPM) ingots. The results show that the fatigue properties of both LPS and GPM Mg-10Gd-3Y-0.5Zr alloy in as-cast condition are determined by Mg matrix and eutectic phase. However, the fatigue property improvement for LPS alloy by T6 heat treatment is significantly superior to that of GPM alloy. The different degree of enhancement of fatigue properties for two conditions of the alloy is related to different crack initiation mechanism. The fatigue crack of the LPS alloy initiates from the free surface of the sample, while the crack of the GPM alloy initiates from porosities or inclusions near the surface of the sample. Meanwhile, the crack of slip band has a crucial effect on the fatigue crack initiation of both as-cast and T6 conditions for LPS alloy.
引用
收藏
页码：2538 / 2548
页数：11
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