The precipitation and mechanical properties of Al-Li-Mg-Si alloys

被引：2

作者：

Chen, R ^{[1
]}

Chen, CQ ^{[1
]}

Huang, Z ^{[1
]}

Zhang, YG ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3 | 2000年 / 331-3卷

关键词：

Al-Li-Mg-Si alloy; mechanical properties; microstructure;

D O I：

10.4028/www.scientific.net/MSF.331-337.1375

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The microstructure and mechanical properties of two Al-Li-Mg-Si alloys and the base Al-Mg-Si alloy were investigated, It was found that the coherent delta' particles became the predominant precipitates with a little equilibrium Mg2Si phase and AlLiSi phase formed in the Li containing alloys. No other metastable phase precipitated. Large volume fraction of delta' lead to higher strength for Li containing alloys than the base Al-Mg-Si alloy, and solution hardening of excess Mg in matrix also increased the strength. The Li containing alloys showed a lower elongation compared with Al-Mg-Si alloy because of the planar slip caused by delta'. The tensile specimens of Al-Li-Mg-Si alloys exhibited macroscopic shear failure and their fracture surface showed mainly transgranular fracture mode while the Al-Mg-Si alloy showed fully ductile dimple fracture.

引用

页码：1375 / 1380

页数：6