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Cooling Behavior and Microstructure of Semisolid A201 Aluminum Alloy Prepared by the SEED Process

by Junzhen Gao 1,2,†, Xiaogang Hu 3,†, Qiang Zhu 3,*, Daquan Li 1,* and Yonglin Kang 2
1
National Engineering & Technology Research Center for Nonferrous Metal Matrix Composites, General Research Institute for Nonferrous Metals, Beijing 100088, China
2
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
3
Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
*
Authors to whom correspondence should be addressed.
These authors contribute equally to this work.
Metals 2019, 9(9), 922; https://doi.org/10.3390/met9090922
Received: 23 July 2019 / Revised: 13 August 2019 / Accepted: 21 August 2019 / Published: 23 August 2019
(This article belongs to the Special Issue Net-Shape Die Casting of Semi-solid Alloys)
The biggest challenge in semisolid processing of high-performance aluminum alloys is the narrow temperature processing windows of these alloys, and as a result, the preparation of qualified semisolid slurries is very important. High solid fraction slurries of high-strength A201 alloy were prepared by the Swirled Enthalpy Equilibration Device (SEED) process. The cooling behavior and microstructures of the A201 slurries produced by the standard, as well as a modified, SEED process were investigated. The results show that qualified A201 slurry can be produced by decreasing the pouring temperature and controlling the processing time in the SEED process. The modified SEED process significantly reduced the radial temperature gradient of the melt, due to the slow cooling rates involved, with the resulting slurries being more uniform, with more spherical microstructures, as compared to those produced by the standard SEED process. The formation of the nondendritic grain structure in the SEED process is attributed to the uniformly distributed large number of nuclei within the melt and the slow cooling of the melt in the containing crucible. View Full-Text
Keywords: A201 aluminum alloy; semisolid slurry; high solid fraction; microstructure; cooling behavior; SEED process A201 aluminum alloy; semisolid slurry; high solid fraction; microstructure; cooling behavior; SEED process
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Gao, J.; Hu, X.; Zhu, Q.; Li, D.; Kang, Y. Cooling Behavior and Microstructure of Semisolid A201 Aluminum Alloy Prepared by the SEED Process. Metals 2019, 9, 922.

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