A new ultrahigh strength Al-Cu-Li alloy

被引：2

作者：

Zhong, Jifa ^{[1
]}

Zheng, Ziqiao ^{[1
]}

Luo, Xianfu ^{[1
]}

机构：

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

来源：

Aluminium Alloys 2014 - ICAA14 | 2014年 / 794-796卷

关键词：

mechanical characterization; Al-Cu-Li alloys; precipitation; Micro-alloying elements; ALUMINUM-LITHIUM ALLOY; ZN ADDITIONS; PRECIPITATION; FRACTURE; MG; MICROSTRUCTURE; EVOLUTION; KINETICS; FATIGUE; ROLES;

D O I：

10.4028/www.scientific.net/MSF.794-796.1050

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this work, a new ultra-high strength Al-Cu-Li alloy was investigated. The ultimate strength, yield strength and elongation of the newly designed alloy by artificial aging are 647.2MPa, 609.4MPa and 7.3% respectively. Among the main strengthening phases of T-1, theta' and S' in the experimental alloys, T-1 is the dominant one. The combined addition of Mg and Ag promoted the precipitation of T-1 and increased the strength of the new alloy greatly. Zn had a similar effect as Ag during the aging strengthening progress, when added with Mg. Among the three micro-alloying elements, Mg, Ag and Zn, Mg had the strongest influence on age strengthening. Compared with the combined additions of (Mg + Ag) and (Mg + Zn), (Ag + Zn) had the weakest influence on aging strengthening. Pre-deformation before aging promoted the precipitation of T-1 phase which weakened the influence of micro-alloying elements (Mg, Ag and Zn) on strengthening the alloys and minished the strength difference between alloy containing (Mg + Ag + Zn) and alloys containing two of them.

引用

页码：1050 / 1056

页数：7

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