Effects of Mg contents on microstructures and second phases of as-cast Al-Zn-Mg-Cu alloys

被引:33
作者
Huang, Rensong [1 ]
Li, Mengnie [1 ]
Yang, Hongfu [1 ]
Lu, Shumeng [1 ]
Zuo, Hanning [1 ]
Zheng, Shanju [1 ]
Duan, Yonghua [1 ]
Yuan, Xiaohong [2 ]
机构
[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Peoples R China
[2] Sino Platinum Met Co Ltd, Kunming Inst Precious Met, Kunming 650106, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 21卷
关键词
Al-Zn-Mg-Cu alloys; Microstructure evolution; Second phase; Nonequilibrium eutectic structure; HOT TEARING SUSCEPTIBILITY; MECHANICAL-PROPERTIES; INTERMETALLIC PARTICLES; LOCALIZED CORROSION; HEAT-TREATMENT; BEHAVIOR; EVOLUTION; TRANSFORMATION; TEMPERATURE; EUTECTICS;
D O I
10.1016/j.jmrt.2022.10.050
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The effects of Mg content on the microstructures and second phases of the as-cast Al-Zn-Mg-Cu alloys were investigated. The results show that the nonequilibrium eutectic structure consists of a(Al), Al7Cu2Fe, h(MgZn2) and T(AlCuMgZn) intermetallic compounds. The alloys with the highest Mg content generate nonequilibrium eutectic structures. The maximum value of nonequilibrium eutectic structures is 10.13 +/- 0.62%. As the Mg content increases, the number of tertiary dendrites in the a(Al) matrix increases significantly, and more Mg can be dissolved into the Al-matrix. In addition, as the Mg content increases, the crystallization temperature range decreases from 169.8 K to 157.3 K. When the Mg content is higher than 2.6 wt%, the microstructure evolution of the Al-Zn-Mg-Cu aluminum alloy is as follows: Liq.-> Liq. + a(Al)-> Liq. + a(Al) + Al7Cu2Fe-> a(Al) + Al7Cu2Fe + h(MgZn2)-+ T(AlCuMgZn). These results play a certain role in promoting the basic research of Al-Zn-Mg-Cu aluminum alloys with high Mg content. (c) 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
引用
收藏
页码:2105 / 2117
页数:13
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