METALS AND METAL MATRIX COMPOSITES |
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Hot Deformation Behavior and Hot-rolling Process of Al-Mg-Si-In Alloy |
SU Yuelan, LUO Binghui, BAI Zhenhai, MO Wenfeng, HE Chuan
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School of Materials Science and Engineering, Central South University, Changsha 410083, China |
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Abstract Al-Mg-Si-In alloy was subjected to thermal compression experiment using Gleeble-3500 thermal simulation testing machine, the temperature range was 350—500 ℃, and the strain rate range was 0.001—1 s-1. The effects of deformation temperature and deformation rate on rheological stress during thermal deformation of the alloy were analyzed, and the constitutive equation and thermal processing diagram of the alloy were established. The microstructure of thermal compression deformation was studied with metallographic microscope. The test results show that with the decrease of deformation temperature or the increase of strain rate, the flow stress and peak stress increase, and the dynamic softening mechanism of the alloy is mainly dynamic recovery, which is difficult to occur dynamic recrystallization. The thermal compression deformation rheological stress behavior of the alloy can be described by a hyperbolic sine constitutive equation, and its deformation activation energy is 180.84 kJ/mol. When the strain is 0.2, the suitable processing area of the alloy is 470—500 ℃, 0.001—0.01 s-1 and 350—375 ℃, 0.1—1 s-1, instability region is 350—360 ℃, 0.001—0.01 s-1. When the strain is 0.8, the suitable processing area of the alloy is 350—360 ℃, 0.1—1 s-1; 390—480 ℃, 0.001—0.01 s-1; 480—500 ℃, 0.1—1 s-1. The instability region is 350—360 ℃, 0.001—0.01 s-1; 490—500 ℃, 0.001—0.01 s-1; 390—425 ℃, 0.1~1 s-1. When the strain of the alloy is 0.8, there are more equiaxed grains in the suitable processing region, and the grains are smaller, while the unstable region is opposite. The effect of actual hot-rolling process 480 ℃, 0.51 s-1, and the rolling effect is well.
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Published: 12 November 2021
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Fund:State Administration of Science, Technology and Industry for National Defence (2011-006). |
Corresponding Authors:
lbh@csu.edu.cn
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About author:: Yuelan Su, a postgraduate student, is currently stu-dying in the School of Materials Science and Enginee-ring, Central South University. She is mainly engaged in the research on the microstructure and properties of Al-Mg-Si alloys. Binghui Luo, professor of Central South University, doctoral supervisor. He is mainly engaged in metal structure-advanced functional material theory research and development, published more than 80 papers by the first author or the corresponding author or graduate tutor status in domestic and international famous academic journals, in which many were cited by the multinational renowned scholars refer to materials science. |
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