Effect of interfacial modification on Mechanical properties of the co-continuous SiC/Al composites

Abstract:

The novel co-continuous SiC/Al composites were prepared by vaccum-infiltration technology. The effects of strain rates and surface oxidation modification of 3D-SiC preforms on the mechanical properties of co-continous SiC/Al composites were investigated in this study. The strain rate hardening effect of the co-ontiounsous SiC/Al composites is observed obviously, and there was the maximum increasement in compressive strength by 25% at strain rate from 10-3/s to 10/s. Furthermore, the compressive strength of the SiC3D/Al composites are also improved by surface oxidation modification of SiC preforms, and the maximum increasement is observed in the composite with 3D-SiC preform at 1200℃ for 6h. Its the compressive strength is higher about 10% than the SiC3D/Al composite without surface oxidation modification at 10-3/s, which suggests that the surface oxidization modification for SiC preforms can play an important role in the fracture behaviours of the SiC3D/Al composites due to the improvement of SiC/Al interfacial characteristics. But the three-point bending strengths of SiC3D/Al composites are not sensitive to surface oxidization modification.