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
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.
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.
Fund: National Natural Science Foundation of China(U1508216);National Natural Science Foundation of China(51771194);Natural Science Foundation of Shandong Province(ZR2019MEE074)
Fig.3 True stress-true strain curves of 31%B4Cp/6061Al composites under different temperatures and strain rates () (a) =0.01 s-1 (b) =0.1 s-1 (c) =1 s-1 (d) =10 s-1
Fig.4 Peak stress distributions of 31%B4Cp/6061Al composites under different deformation conditions Color online
/ s-1
375 ℃
400 ℃
425 ℃
450 ℃
475 ℃
500 ℃
525 ℃
0.01
89.34
73.90
67.40
61.77
56.69
38.66
35.52
0.1
107.00
92.89
86.80
76.45
70.81
60.01
52.52
1
126.18
113.58
103.75
94.40
85.91
79.61
65.38
10
158.00
146.00
133.39
124.92
112.96
102.04
92.53
Table 1 Peak stresses of 31%B4Cp/6061Al composites under different deformation conditions
Fig.5 Power dissipation maps of 31%B4Cp/6061Al composites at strains of 0.1 (a), 0.3 (b), 0.5 (c) and 0.7 (d) (The contour numbers represent coefficients of power dissipation (η) Color online
Fig.6 Instability zones of 31%B4Cp/6061Al composites at strains of 0.1 (a), 0.3 (b), 0.5 (c) and 0.7 (d) (The contours represent instability factors (ξ), and the blue regions less than zero are the unstable regions, while the yellow regions greater than or equal to zero are the stable regions) Color online
Fig.7 Processing maps for 31%B4Cp/6061Al composites at strains of 0.1 (a), 0.3 (b), 0.5 (c) and 0.7 (d) (I—instability domain, II—machinable domain, III—optimal processing domain) Color online
Strain
Domain
T / ℃
/ s-1
0.1
I
385~450
3.16~10
II
435~525
0.01~1
475~525
1~10
III
500~525
0.01~0.031
0.3
I
275~435
2.80~10
II
420~525
0.01~0.39
505~525
0.39~10
III
490~525
0.01~0.025
0.5
I
375~455
2.51~10
II
426~525
0.01~0.1
III
480~525
0.01~0.039
0.7
I
375~450
2.23~10
II
438~525
0.01~0.1
III
480~520
0.01~0.021
Table 2 Hot processing parameters of 31%B4Cp/6061Al composites
Fig.8 Low (a, b) and high (c, d) magnified SEM images of 31%B4Cp/6061Al composites at temperatures and strain rates of 500 ℃, 0.01 s-1 (a, c) and 400 ℃, 10 s-1 (b, d)
Fig.9 Distribution of strain of 31%B4Cp/6061Al composites at temperature of 475 ℃ and strain rate of 10 s-1 after hot compression Color online
Fig.10 OM images of 31%B4Cp/6061Al composites at temperature of 475 ℃ and strain rate of 10 s-1 at areas A (a), B (b) and C (c) in Fig.9
Fig.11 OM images of 31%B4Cp/6061Al composites at central area of specimen under temperatures and strain rates of 450 ℃, 0.01 s-1 (a), 450 ℃, 1 s-1 (b), 500 ℃, 0.01 s-1 (c) and 500 ℃, 1 s-1 (d)
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