High cycle fatigue improvement by heat-treatment for semi-continuous casting Mg96.34Gd2.5Zn1Zr0.16 alloy

被引：26
作者：
He, Zongling
Peng, Liming
Pe, Penghuai [1 ]
Wang, Yingxin
Hu, Xiaoyu
Ding, Wenjiang
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 604卷
基金：
中国国家自然科学基金;
关键词：
Semi-continuous casting; Mg-Gd-Zn alloy; Heat-treatment; Fatigue properties; STACKING ORDERED STRUCTURE; MAGNESIUM ALLOY; ZR ALLOY; MECHANICAL-PROPERTIES; GD ALLOYS; ZN; BEHAVIOR; TEMPERATURE; MICROSTRUCTURE;
D O I：
10.1016/j.msea.2014.03.017
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
High cycle fatigue behavior of casting Mg96.34Gd2.5Zn1Zr0.16 alloy was investigated for its improvement by heat-treatment. After solution treatment (T4, 10 h@773 K) or solution treatment plus artificial aging (T6, 10 h@773 K + 128 h@473 K), fatigue strength of this alloy was found to be enhanced. The T6-treated alloy achieved the highest fatigue strength, 130 MPa, being 25 MPa and 18 MPa greater than those of the as-cast and T4-treated alloy, respectively. The average fatigue life of the heat-treated alloys is longer than that of the as-cast alloy a given stress amplitude. For the distribution of fatigue life, a fatigue life gap spanned from 105 to 107 can be observed in the as-cast and T4-treated alloy. Such a gap is absent after the alloy received artificial aging. The mechanism for the high cycle fatigue behavior of the casting alloy after heat-treatment was also discussed. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：78 / 85
页数：8
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