A mesomechanical ductility model of SiC_p/Al composite

Abstract

Based on tensile cracking of SiC_p and decohesion of the interface between SiC_p and Al matrix, a mesome-chanical model for tensile deformation of SiC_p/Al composites was developed. The microcracks and multi-scale second phase particles were assumed to distribute homogeneously. A nonlinear quantitative relationship between tensile ductility and volume fraction of SiC_p was established based on the model. The tensile ductility values of 2xxx SiC_p/Al and 6xxx SiC_p/Al composites predicted by the model are in good agreement with the experimental values. The analysis of effects of multi-scale second phases on the ductility of the composites indicates that the ductility decreases with the increase of the volume fraction of SiC_p and precipitates in Al matrix and is almost independent of constituents and dispersoids.

Keywords

SiC_p/Al / composite / mesomechanics / tensile ductility / model

References

[1] ClyneT WAn introduction to metal matrix composites[M], 1993, Cambridge, Cambridge University Press

[2] LloydD J. Particle reinforced Al and Mg matrix composites[J]. International Materials Reviews, 1994, 39(1): 1-23

[3] RamakrishnanN. An analytical study on strengthening of particulate reinforced metal matrix composites[J]. Acta Mater, 1996, 44(1): 69-77

[4] ChanK S. A fracture model for hydride induced embrittlement[J]. Acta Metall Mater, 1995, 43(12): 4325-4335

[5] ZhangGuo-jun, LiuGang, DingXiang-dong, et al.. Model for tensile ductility of high strength Al alloys containing second particles of various sized scales [J]. The Chinese Journal of Nonferrous Metals, 2002, 12(1): 1-10

[6] AshbyM F. The deformation of plastically non-homogeneous materials[J]. The Philosophical Magazine, 1970, 21(2): 399-424

[7] AngersR, KrishnadevM R, TremblayR, et al.. Characterization of SiC_p/2024 aluminum alloy composites prepared by mechanical processing in a low energy ball mill[J]. Materials Science and Engineering, 1999, A262(1): 9-15

[8] ZuLi-jun, LuoShou-jing. Preparation of SiC_p/2024 Al alloy composites by powder mixing and semi-solid extrusion technology[J]. The Chinese Journal of Nonferrous Metals, 2000, 10(1): 179-183

[9] DerrienK, Guedra-DegeorgesD, BaptisteD, et al.. Multiscale modeling of the damaged plastic behavior and failure of SiC_p/Al composites [J]. International Journal of Plasticity, 1999, 15: 667-685

[10] ChenShang-ping, XieNiao-so, SuJian-zhang, et al.. The mechanical properties of Al alloys matrix composites based on discontinuous reinforcements[J]. Materials Science and Engineering, 1997, 15(4): 72-75

[11] ChenShang-ping, HeXiao-ling. Fabrication and properties of metal matrix composites based on SiC particle reinforced aluminium alloys [J]. Journal of Shanxi Institute of Technology, 1995, 11(2): 108-111

[12] DingZhan-lai, FanYun-chang, QiHai-bo, et al.. Tensile properties of SiC_p/Al alloy composites [J]. The Chinese Journal of Nonferrous Metals, 1999, 9(Suppl 1): 265-269

[13] ChenPeng-cheng, LinSu-jien. A study on the low-cycle fatigue properties of SiCp/6061 Al composites[J]. Journal of Materials Science, 1997, 32(15): 4153-4158

[14] DoelT J A, BowenP. Tensile properties of particulate reinforced metal matrix composites[J]. Composite, Part A: Applied Science and Manufacturing, 1996, 27(8): 655-665