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Study of the Hot Deformation and Processing Map of 31%B4Cp/6061Al Composites |
ZHOU Li1, LI Ming1, WANG Quanzhao2(), CUI Chao3, XIAO Bolv2, MA Zongyi2 |
1 School of Electromechanical and Vehicle Engineering, Yantai University, Yantai 264005, China 2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3 School of Materials Science and Engineering, Harbin Institute of Technology Weihai, Weihai 264209, China |
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Cite this article:
ZHOU Li, LI Ming, WANG Quanzhao, CUI Chao, XIAO Bolv, MA Zongyi. Study of the Hot Deformation and Processing Map of 31%B4Cp/6061Al Composites. Acta Metall Sin, 2020, 56(8): 1155-1164.
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Abstract B4Cp/Al composite has the advantages of light weight, good stability, high neutron absorption capacity and excellent mechanical properties, and is increasingly used in nuclear industry for storage and transportation of spent fuels. However, due to the obvious difference in the mechanical properties between the reinforcement and the aluminum matrix, the deformation of B4Cp/Al composite is quite difficult. In this study, the hot compression behavior of 31%B4Cp/6061Al (volume fraction) composite fabricated by powder metallurgy was investigated in the temperature range of 375~525 ℃ and strain rate range of 0.001~10 s-1 with Gleeble-3800 thermal simulator system. Based on the modified dynamic material model (MDMM), the power dissipation efficiency and processing maps were established, the instability zones and stable area of hot deformation were determined, and the microstructure evolution during hot compression were analyzed. The results show that the temperature and strain rate have significant influences on the flow stress of 31%B4Cp/6061Al composite, and the flow stress increases with decreasing temperature or with increasing strain rate. The optimum processing domains for 31%B4Cp/6061Al composite are at temperatures of 480~525 ℃ with strain rates of 0.01~0.04 s-1. However, the processing instability area is mainly concentrated in low temperature and high strain rate, and increases with the increase of strain. During the hot compressing, the microstructure evolution is influenced by hot processing parameters, such as the strain, temperature and strain rate. The higher the strain is, the more serious the grain deformation is. With increasing deformation temperature or decreasing strain rate, the size of the dynamic recrystallization grain in matrix increases obviously.
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Received: 27 December 2019
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Fund: National Natural Science Foundation of China(U1508216);National Natural Science Foundation of China(51771194);Natural Science Foundation of Shandong Province(ZR2019MEE074) |
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