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Acta Metall Sin  2019, Vol. 55 Issue (7): 911-918    DOI: 10.11900/0412.1961.2018.00453
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Multi-Scale Study on the Fracture Behavior of Hot Compression B4C/6061Al Composite
Li ZHOU1,Pengfei ZHANG1,Quanzhao WANG2(),Bolü XIAO2,Zongyi MA2,Tao YU1
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
Cite this article: 

Li ZHOU,Pengfei ZHANG,Quanzhao WANG,Bolü XIAO,Zongyi MA,Tao YU. Multi-Scale Study on the Fracture Behavior of Hot Compression B4C/6061Al Composite. Acta Metall Sin, 2019, 55(7): 911-918.

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Abstract  

B4C/Al composites possess excellent physical and mechanical properties, especially the capacity of neutron absorption, and therefore are increasingly used in nuclear industry for storage and transportation of spent fuels. However, very little study has reported the fracture behavior of B4C/Al composite under hot compression. Therefore, at the present work, the hot compression fracture behavior of B4C/6061Al composite was studied by combining experimental and simulation methods, and the fracture model and damage parameters were determined. A unidirectional multi-scale finite element model was established to analyze the meso damage mechanism of B4C/6061Al composite. The results show that the shear damage model cannot predict the fracture behavior of B4C/6061Al composite because of the inhomogeneous microstructure, and the GTN damage model can accurately predict the hot compression fracture behavior of B4C/6061Al composite. At the same time, by comparing with the experimental results, the GTN damage parameters of 31%B4C/6061Al composite were determined, and then by applying the damage parameters, the calculated crack depth and load-displacement curves agree well with the experimental results. In addition, the micro-damage mechanism of B4C/6061Al composite during hot compression process was analyzed accurately with the unidirectional multi-scale finite element method, which was caused by brittle fracture of particles, debonding between matrix and interface, and ductile damage of matrix.

Key words:  B4C/6061Al composite      hot compression      multi-scale method      fracture     
Received:  27 September 2018     
ZTFLH:  TG339  
Fund: Supported by National Key Research and Development Program of China(No.2017YFB0703104);National Natural Science Foundation of China(Nos.U1508216);National Natural Science Foundation of China(51771194);Natural Science Foundation of Shandong Province(No.ZR2019MEE074)

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00453     OR     https://www.ams.org.cn/EN/Y2019/V55/I7/911

Fig.1  OM image of initial microstructure of 31%B4C/6061Al composite
Fig.2  Finite element model for hot compression
Thermo-physical parameterValueUnit
Young's modulus (E)136GPa
Shear modulus of elasticity (G)52.3GPa
Specific heat (cp)1.381J·g?1·K?1
Thermal diffusivity31.42m2·s?1
Coefficient of thermal expansion (φ)16.9×10?6K?1
Poisson's ratio (μ)0.3
Density (ρ)2.64g·m?3
Table 1  Thermo-physical properties of 31%B4C/6061Al composite
Fig.3  Crack morphologies of 31%B4C/6061Al composite after hot compression at 375 ℃ (a), 425 ℃ (b), 475 ℃ (c) and 525 ℃ (d) under strain rate of 10 s-1 and reduction of 75%
Fig.4  Crack morphologies of 31%B4C/6061Al composite calculated by shear fracture model at 375 ℃ (a), 425 ℃ (b), 475 ℃ (c) and 525 ℃ (d) under strain rate of 10 s-1 and reduction of 27%
Fig.5  Crack morphologies of 31%B4C/6061Al composite calculated by GTN model at 375 ℃ (a), 425 ℃ (b), 475 ℃ (c) and 525 ℃ (d) under strain rate of 10 s-1
Fig.6  Comparisons of crack depth calculated by GTN model (a~d) and experimental results (e~h) at 375 ℃ (a, e), 425 ℃ (b, f), 475 ℃ (c, g) and 525 ℃ (d, h) under strain rate of 10 s-1
Fig.7  Comparisons of load-displacement curves be-tween experimental and calculated by GTN model during hot compression at strain rate of 10 s-1 (a) and 425 ℃ (b)
Fig.8  Selections of feature positions in finite element simulation
Fig.9  Establishment of 2D mesoscopic finite element model of 31%B4C/6061Al
Fig.10  Crack formation in mesoscopic model at time of 0.06 s (a), 0.062 s (b), 0.065 s (c) and 0.068 s (d)
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