Materials Reports 2019, Vol. 33 Issue (Z2): 398-401 |
METALS AND METAL MATRIX COMPOSITES |
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Effect of Zn/Mg Ratio and Aging Temperature on Precipitation Behavior ofAl-Zn-Mg-Cu Aluminum Alloy |
CHAO Daiyi1, SUN Youzheng1, LIU Xiaoteng1, LI Xingdong1, LI Weijian2, LYU Zhengfeng1, CHENG Rence1
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1 National Engineering Research Center for Plastic Working of Aluminium Alloys, Shandong Nanshan Aluminum Co., Ltd., Longkou 265713; 2 College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005 |
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Abstract The effects of Zn/Mg ratio and aging temperature on precipitation behavior (GP area and η′ phase of Al-Zn-Mg-Cu series alloys were investigated by using the aluminum alloy module in thermodynamic simulation software in detail. The results show that the content of GP area decreased with the increase of Zn/Mg ratio, and low temperature aging could promote the formation of GP area. However the content of η′ phase decreased slightly with the increase of Zn/Mg ratio. The aging time was cut down about 16 h, when the alloy at 160 ℃ than at 120 ℃; while under the same aging temperature, at different aging time with the increase of Zn/Mg ratio, the time when the content reached 6.5%, first increases slowly, and then increases rapidly when Zn/Mg ratio is greater than 2.91. The quenching sensitivity of the alloy decreases with the increase of Zn/Mg ratio, while with the Zn/Mg ratio increased from 2.46 to 3.20, the nose temperature of GP area and η′ phase decrease from 150 ℃ and 330 ℃ to 140 ℃ and 320 ℃, respectively. The critical cooling rate reduced with the increase of Zn/Mg ratio.
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Published: 25 November 2019
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About author:: Daiyi Chao received his master of engineering in environmental and material engineering from Yantai University in June 2013. From September 2013 to March 2017, he studied for doctorate in school of materials, Harbin Institute of Technology. Mainly engaged in heat treatment and deformation process of stainless steel and high strength aluminum alloy. At present, he is a failure analysis expert of Chines Failure Analysis Institution of CMES. Weijian Li, Ph.D., lecturer, since August 2019,worked at College of nuclear equipment and nuclear engineering of Yantai University, mainly engaged in the research of first-principles calculations of interface pro-perties and process properties of metal materials |
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