Effects of Single/Double Size SiCp on Microstructure and Properties of AZ91D Alloy
Taking AZ91D magnesium alloy as matrix and SiC particles with an average particle size of 10 μm and 10 nm as reinforcing phases,single-and double-size SiC particle-reinforced magnesium matrix composites were pre-pared by semi-solid state mechanical stirring method.The results reveal that the 2%SiCp/AZ91D composites with particle size of 10 nm achieve a tensile strength of 198 MPa and yield strength of 113 MPa,which is increased by 34.7%and 46.7%,respectively,and elongation reaches 6.4%,which is mainly attributed to the grain refinement effect of nano SiC particles.The fracture mechanism indicates that the cracks in the SiCp/AZ91D composite mainly propa-gate along the interface of micron SiCp-AZ91D.
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