The tensile properties and high cyclic fatigue characteristics of Mg-5Li-3Al-1.5Zn-2RE alloy

被引：23

作者：

Li, Tingqu ^{[1
]}

Liu, Yongbing ^{[1
]}

Cao, Zhanyi ^{[1
]}

Jiang, Dongmei ^{[1
,2
]}

Cheng, Liren ^{[1
]}

机构：

[1] Jilin Univ, Key Lab Automobile Mat, Minist Educ, Dept Mat Sci & Engn, Changchun 130025, Peoples R China

[2] Aviat Univ AF, Mech Teaching & Res Off, Changchun 130022, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2010年 / 527卷 / 29-30期

关键词：

Magnesium alloys; Superplasticity; Serrated flow; Fatigue; MG-LI ALLOYS; MECHANICAL-PROPERTIES; SERRATED FLOW; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.1016/j.msea.2010.08.094

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The tensile and fatigue properties of the Mg-5Li-3Al-1.5Zn-2RE (LAZ531-2RE) alloy were presented. The alloy was prepared by hot extrusion after vacuum casting. The Portevin-Le Chatelier (PLC) phenomenon was observed during tensile deformation. The PLC effect was attributed to the dynamic interaction between solute atoms (Li) and dislocation movement. The abnormal negative strain rate sensitivity (SRS) in high strain rate regime can be explained by the dynamic strain ageing (DSA) mechanism. The higher ductility may be associated with finer-grained microstructure and Li addition. Fatigue crack propagation was characterized by striation-like features. The smaller spacing of fatigue striations and larger fatigue crack propagation zone at the lower total strain amplitude gave rise to a longer fatigue life. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：7808 / 7811

页数：4

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