Effect of Li content on ageing precipitation behavior of Al-Mg-Si alloy

被引：2
作者：
Yang Xiao-kun [1 ,2 ,3 ]
Xiong Bai-qing [1 ,3 ]
Li Xi-wu [1 ,2 ,3 ]
Yan Li-zhen [1 ,2 ,3 ]
Li Zhi-hui [1 ,3 ]
Zhang Yong-an [1 ,2 ,3 ]
Li Ya-nan [1 ,2 ,3 ]
Wen Kai [1 ,2 ,3 ]
机构：
[1] GRINM Grp Corp Ltd, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China
[2] GRIMAT Engn Inst Co Ltd, Beijing 101407, Peoples R China
[3] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China
来源：
CAILIAO GONGCHENG-JOURNAL OF MATERIALS ENGINEERING | 2021年 / 49卷 / 06期
关键词：
Al-Li alloy; Al-Mg-Si alloy; precipitation phase; precipitate-free zone; microstructure; MECHANICAL-PROPERTIES; MICROSTRUCTURE;
D O I：
10.11868/j.issn.1001-4381.2020.000794
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of Li content on the ageing precipitation behavior of Al-3.0Mg-0.6Si alloy was investigated by transmission electron microscopy. The evolution and distribution of the precipitation phases in alloys with different Li contents during the artificial ageing at 170 degrees C were analyzed. The results show that the addition of Li changes the ageing precipitation behavior of Al-3.0Mg-0.6Si alloy. In the alloy with 2.15% (mass fraction) Li addition, the spherical delta'-Al-3 Li phases are formed first in grain interiors, while the needle-shaped beta ''-Mg2Si phases gradually precipitate at the later ageing stage. After ageing for 192 h, there are obviously dual phase precipitation of spherical delta' phase and needle-shaped beta '' phase formed. However, beta '' phase precipitation is not found in the alloy with 3.12% Li addition during the observed ageing stage. In addition, there are no precipitation phases at the grain boundaries of the Li-containing alloys, and the precipitate-free zones (delta'-PFZs) and delta' phase are found nearby the grain boundaries. After ageing for 100 h, the alloy with 2.15% Li addition precipitates needle-shaped beta '' phase in the delta'-PFZs regions. Both the half width size and growth rate of the delta-PFZs in the alloy with 2.15%Li addition are greater than that of 2.68%,3.12% Li alloys.
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页码：100 / 108
页数：9
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