Improving the fatigue strength of 7075 alloy through aging

被引：60

作者：

Leng, L. ^{[1
]}

Zhang, Z. J. ^{[1
]}

Duan, Q. Q. ^{[1
]}

Zhang, P. ^{[1
]}

Zhang, Z. F. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, Mat Fatigue & Fracture Div, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 738卷

基金：

中国国家自然科学基金;

关键词：

7075 Al alloy; Aging treatment; Hardness; Tensile strength; Fatigue strength; ZN-MG ALLOYS; TRANSMISSION ELECTRON-MICROSCOPY; STRESS-CORROSION CRACKING; ALUMINUM-ALLOYS; AL-ALLOYS; MECHANICAL-PROPERTIES; VOLUME FRACTION; BEHAVIOR; MICROSTRUCTURE; FRACTURE;

D O I：

10.1016/j.msea.2018.09.047

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In order to optimize the fatigue strength of 7075 Al alloy, the hardness, tensile and fatigue tests as well as the microstructure observation under different aging conditions were investigated. The result indicates that, with the aging time increasing, the precipitation spacing first decreases and then increases, which leads to the hardness and tensile strength first increasing and then decreasing. With the increase of yield strength, the fatigue strength increases first and then decreases, resulting in an optimization of fatigue strength. Especially, the specimen aged at 120 degrees C for 48 h with strength and elongation in middle of the three specimens exhibits the highest fatigue strength of 165 MPa. Considering the effect of yield strength on fatigue strength and fatigue damage, the causes for the parabolic variation of fatigue strength were analyzed.

引用

页码：24 / 30

页数：7

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