Effect of Zn/Mg ratio on microstructure and mechanical properties of Al-Zn-Mg alloys

被引：6
作者：
Zhao, Peihao [1 ]
Wu, Xiaolan [1 ]
Gao, Kunyuan [1 ]
Wen, Shengping [1 ]
Rong, Li [1 ]
Huang, Hui [1 ]
Wei, Wu [1 ]
Nie, Zuoren [1 ]
机构：
[1] Beijing Univ Technol, Educ Minist China, Key Lab Adv Funct Mat, Beijing 100124, Peoples R China
来源：
MATERIALS LETTERS | 2022年 / 312卷
基金：
北京市自然科学基金; 中国国家自然科学基金;
关键词：
Metals and alloys; Microstructure Zn/Mg ratio; T ' phase; CU ALLOY; PRECIPITATION;
D O I：
10.1016/j.matlet.2022.131676
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of Zn/Mg ratio on microstructure and mechanical properties of Al-Zn-Mg alloys with the same Zn + Mg contents has been investigated through microhardness test, electrical conductivity test and transmission electron microscopy (TEM). In this study, Zn/Mg ratio was changed from 1.61 to 3.93 with Zn + Mg content of 6 wt%. The results showed that the Vickers hardness of the alloy with the Zn/Mg ratio of 2.38 aged at 120 degrees C for 48 h was highest. Through TEM observation, strengthening precipitates in investigated alloys were mainly spherical T' phases and a few plate-like eta' phases. With the increase of Zn/Mg ratio, T' phase fraction in alloys decreased from 88% to 81%, and the corresponding eta' phase fraction increased from 12% to 19%. As aging at 120 degrees C from 48 h to 168 h, the coarsening degree of precipitates of alloy A and alloy C were both greater than that of alloy B. When the Zn + Mg content was 6 wt%, the alloy with the Zn/Mg ratio of 2.38 had optimum microstructure and mechanical properties.
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页数：4
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