Enhanced low-cycle fatigue and crack propagation resistance of an Al-Cu-Mg-Si forging alloy by non-isothermal aging

被引：22

作者：

Li, Pengwei ^{[1
]}

Li, Huizhong ^{[1
,2
,3
]}

Liang, Xiaopeng ^{[1
,2
,3
]}

Huang, Lan ^{[2
]}

Zhang, Kelong ^{[1
]}

Chen, Zhi ^{[1
]}

机构：

[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

[2] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

[3] Cent S Univ, Minist Educ, Key Lab Nonferrous Met Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2018年 / 732卷

基金：

中国国家自然科学基金;

关键词：

Aluminum alloys; Low-cycle fatigue; Fatigue crack propagation; Non-isothermal aging; ALUMINUM-ALLOYS; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; CORROSION BEHAVIOR; FRACTURE-BEHAVIOR; GROWTH-BEHAVIOR; STRAIN; MICROSTRUCTURE; INITIATION;

D O I：

10.1016/j.msea.2018.07.002

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Low-cycle fatigue (LCF) and fatigue crack propagation (FCP) behavior of an Al-Cu-Mg-Si forging alloy with different non-isothermal aging (NIA) degrees were investigated. The main question addressed was about the interactions between precipitates and dislocations and their influences on LCF and FCP resistance. Strain-controlled LCF and Delta K-controlled FCP were tested. The characterization of precipitates and fractography were performed on TEM/HRTEM and SEM, respectively. The results showed that under cyclic loading, shearable precipitates were suffered from particle shearing mechanism associated with slip localization, resulting in cyclic softening behavior and low FCP rates; non-shearable precipitates were suffered from bypassing mechanism associated with homogeneous slip, resulting in cyclic hardening behavior and high FCP rates. The mixed precipitation characteristics obtained by complete NIA treatment, consisting of shearable and non-shearable precipitates, led to cyclic stability behavior and low FCP rates, which means a simultaneous enhancement of LCF and FCP resistance.

引用

页码：341 / 349

页数：9

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