Experimental and Modeling of the Coupled Influences of Variously Sized Particles on the Tensile Ductility of SiC p /Al Metal Matrix Composites

摘要

The influences of the SiC p , constituents, and precipitates on the tensile ductility of SiC p /Al metal matrix composites have been investigated through both modeling and experimental studies. It has been shown that the model predictions are in good agreement with the experimental data when testing on SiC p /Al-Cu-Mg composites. After coupled with the aging-hardening behavior of the composites, the model can be used to predict the evolution of the tensile ductility as a function of the aging time and aging temperature. It has been shown that the tensile ductility of the composites decreases with the increase in the volume fractions of the SiC p , constituents, and precipitates. Concerning the cracking phases (including both the SiC p and constituents), the SiC particles have a greater effect on the tensile ductility than do the constituents, due to the relatively larger volume fraction. During aging, the tensile ductility decreases as the aging time increases, and reaches the minimum value at the peak-aged stage. Then, the tensile ductility increases. The evolution of the tensile ductility is also sensitive to the aging temperature. Increasing the aging temperature can accelerate the decreasing velocity and increase the minimum value of the tensile ductility.