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

Published online by Cambridge University Press:  24 June 2016

Jimei Mao ,
Wencai Liu ,
Yanlei Li ,
Guangling Wei ,
Liang Zhang ,
Wenbing Zou ,
Ying Tian  and
Guohua Wu
Jimei Mao
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Wencai Liu*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; and Shanghai Light Alloy Net Forming National Engineering Research Center Co., Ltd, Shanghai 201615, China
Yanlei Li
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Guangling Wei
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Liang Zhang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Wenbing Zou
Affiliation:
Shanghai Spaceflight Precision Machinery Research Institute, Shanghai 201600, China
Ying Tian
Affiliation:
Shanghai Spaceflight Precision Machinery Research Institute, Shanghai 201600, China
Guohua Wu
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
*
a) Address all correspondence to this author. e-mail: liuwc@sjtu.edu.cn
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Abstract

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.

Keywords

Mg–10Gd–3Y–0.5Zrhigh cycle fatigueporositylow-pressure sand-castinggravity permanent mold casting
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 16 , 29 August 2016 , pp. 2538 - 2548
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Copyright
Copyright © Materials Research Society 2016 

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