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