Pages 97-98
The effects of thermal cycling on the tensile properties of SiC particulate reinforced cast aluminum alloy have been studied. The results were discussed in terms of a microstructure controlled mechanism which is void growth, coalescence and debonding of SiC particle for tensile fracture. The ductilities of thermally cycled material is twice larger than that of as received material. The measurements of 3D shape of fracture surfaces show that the microvoid coalescence occured around of the SiC particle clusters. Based on the micro-mechanism of tensile fracture for the thermally cycled material simulations were conducted on void growth and debonding of the SiC particle/matrix interface. The predicted stress-strain behavior is consistent with the experimental results. The stress and strain field around the SiC particle were examined through the simulated results.
