Effects of Sc addition on the microstructure and mechanical properties of cast Al-3Li-1.5Cu-0.15Zr alloy

被引：58
作者：
Shi, Chunchang
Zhang, Liang [1 ]
Wu, Guohua [1 ]
Zhang, Xiaolong
Chen, Antao
Tao, Jiashen
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 680卷
基金：
中国国家自然科学基金;
关键词：
Cast Al-Li alloy; Scandium; Grain refinement; Microstructure; Mechanical properties; EVOLUTION; DECOMPOSITION; AEROSPACE;
D O I：
10.1016/j.msea.2016.10.063
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effects of Sc addition on the microstructure and mechanical properties of cast Al-3Li-1.5Cu-0.15Zr alloy were investigated by microscopy methods and tensile tests. With the addition of 0.15 wt% Sc, the grain size of studied alloy in as-cast state decreased from 120 gm to 30 pm and did not grow obviously after two-step solution treatment (32 hat 500 degrees C+24 hat 560 degrees C). After aging at 175 degrees C for 32 h, the elongation (EL) of Sc-containing alloy reached 5.5%, which increased by 83% compared with Al-3Li-1.5Cu-0.15Zr alloy. The key factors for improvement of comprehensive mechanical properties in Al-3Li-1.5Cu-0.15Zr-0.15Se alloy could be summarized as follows: grain refining, size reduction of delta' phases and the precipitation of core/double-shell Al-3 (Li, Sc, Zr) composite particles.
引用
收藏
页码：232 / 238
页数：7
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