Effect of the over-aging degree on high cycle fatigue properties of an ultra-high strength Al-Zn-Mg-Cu alloy

被引：3
作者：
Liu, Yuyang [1 ]
Zhao, Zhihao [1 ]
Wang, Gaosong [1 ,2 ]
Qin, Gaowu [1 ,3 ]
机构：
[1] Northeastern Univ, Sch Mat Sci & Engn, Shenyang 110819, Peoples R China
[2] Northeastern Univ, Key Lab Electromagnet Proc Mat, Minist Educ, Shenyang 110819, Peoples R China
[3] Northeastern Univ, Key Lab Anisotropy & Texture Mat, Minist Educ, Shenyang 110819, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2024年 / 918卷
关键词：
Ultra-high strength Al-Zn-Mg-Cu alloy; Over-aging treatment; High-cycle fatigue; Fatigue strength; STRESS-CORROSION CRACKING; ALUMINUM-ALLOYS; MECHANICAL-PROPERTIES; PROPAGATION BEHAVIOR; STRAIN LOCALIZATION; FRACTURE-BEHAVIOR; GRAIN-BOUNDARIES; PRECIPITATION; DEFORMATION; SLIP;
D O I：
10.1016/j.msea.2024.147428
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
An ultra-high strength Al-Zn-Mg-Cu alloy with high Zn content was subjected to T6, T79, T76, T74 and T73 ageing treatments in order to investigate the effect of the over-aging degree on the high cycle fatigue (HCF) properties of the alloy. The microstructures and fatigue fracture morphologies were analyzed. The results showed that the fatigue strengths exhibited a non-linear trend of first increasing and then decreasing from the T6 to T73 aged samples. The T79 aged sample obtained the highest fatigue strength, was 247 MPa. The Basquin equation was used to describe the changes in HCF properties. The physical meanings and causes of changes in the parameters of the fitted Basquin equation were rationalized by combining quantitative analysis of the microstructures and existing models. The combination of microstructural evolution and the trend of parameters in the fitted Basquin equation was ultimately employed to elucidate the underlying mechanism of the specific nonlinear fatigue strength trend.
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页数：14
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