Journal
MATERIALS LETTERS
Volume 312, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.131676
Keywords
Metals and alloys; Microstructure Zn/Mg ratio; T ' phase
Funding
- National Key Research and Development Program of China [2021YFB3704204, 2021YFB3700902, 2021YFB3704205]
- Beijing Natural Science Foundation [2202009]
- National Natural Science Foundation of China [51621003]
- Basic Research Program of Jiangsu Province (NSF) [BK20191148]
- Beijing Lab Project for Modern Transportation Metallic Materials and Processing Technology
- Jiangsu Key Laboratory for Clad Materials [BM2014006]
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The influence of Zn/Mg ratio on microstructure and mechanical properties of Al-Zn-Mg alloys with the same Zn + Mg contents was investigated. It was found that the alloy with a Zn/Mg ratio of 2.38 had the highest Vickers hardness after aging at 120 degrees C for 48 h, indicating an optimum microstructure and mechanical properties.
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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