Design of novel high-performance Al-Cu-Mg alloys containing Zn and Li

被引：1
作者：
Chen, Zhiguo [1 ,2 ,3 ]
Ren, Jieke [1 ,3 ]
Yang, Wenling [1 ,3 ]
Fang, Liang [1 ,3 ]
机构：
[1] Cent S Univ, Sch Mat Sci & Engn, Changsha 410083, Hunan, Peoples R China
[2] Hunan Univ Humanities Sci & Technol, Dept Mech & Elect Engn, Loudi 417000, Hunan, Peoples R China
[3] Cent S Univ, Light Alloy Res Inst, Changsha, Hunan, Peoples R China
来源：
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS | 2017年 / 231卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Aluminium alloy; alloying; damage tolerance; corrosion resistance; microstructure; MECHANICAL-PROPERTIES; CORROSION BEHAVIOR; X ALLOYS; AG ALLOY; MICROSTRUCTURE; PRECIPITATION; EXPOSURE;
D O I：
10.1177/1464420715612108
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
To design novel high-performance aluminium alloys, the properties and microstructure of Al-4.2Cu-1.4Mg alloy containing Zn and Li have been investigated by tensile tests, fatigue crack propagation test, slow strain-rate tensile test, Kahn tear test, scanning electron micrography and transmission electron micrography. The stress corrosion cracking resistance and toughness of Al-4.2Cu-1.2Mg alloy can be markedly improved by small Zn addition. Independent Li addition has no significant effect on the corrosion resistance of Al-4.2Cu-1.2Mg alloy, but the tensile strength is improved and the fatigue crack propagation is restrained. Small Zn addition promotes the precipitation of S phase during age treatment, and the grain boundary precipitates are scarcer than those of the base alloy. The co-effect of Li and Zn addition promotes the fine and dispersed precipitation of the S (non-equilibrium Al2CuMg) phases in Al-4.2Cu-1.2Mg alloy. The comprehensive performance (the fracture toughness, tensile properties, stress corrosion resistance and fatigue crack propagation resistance) of Al-4.2Cu-1.2Mg alloy with 0.25% Zn and 1.0%Li is outstanding. This alloy could lay the foundation for the design of new aluminium alloys.
引用
收藏
页码：349 / 357
页数：9
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