| Microstructure, wettability, tensile strength and wear properties were examined in AC8A/SiC_p composites. Increasing Mg content in matrix improved wettability probably due to decreasing surface tension of the melt. By increasing the stirring time and particle size, the particles were more uniformly distributed in the matrix. And the particle distribution of as-cast state had a significant influence on that of extruded state, that is, particles were rarely aligned in the extrusion direction in the composites stirred for 20 mimutes. Tensile strength was increased as stirring time increased and particle size decreased, but significant increase of high temperature strength due to the presence of particles was not obtained. Also wear resistance did not vary significantly with the particle size. It is clear that SiC particle reinforcement improved both tensile strength and wear resistance. |
|
