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Solidification microstructure and mechanical property are explored.Furthermore,tensile fracture and microstructure are analyzed by using SEM and JXA 840A electron probe.The results indicate that SiC particles in SiCp/ZA27 composite are mainly distributed on interfaces or between dendrites and surrounded by primary α phase.The dendrite of α phase is fined by SiCp.The tensile strength at room temperature decreases with the increasing of SiCp addition.The tensile strength at elevated temperature increases with the addition of SiCp.The fracture of SiCp/ZA27 composites is the mixture of tough and brittle fracture.The carck is prone to extend along the interface and the region of dispersed shrinkage.
Solidification microstructure and mechanical properties are explored. Stillrther, tensile fracture and microstructure are analyzed by using SEM and JXA 840A electron probe. The results indicate that SiC particles in SiCp / ZA27 composite are mainly distributed on interfaces or between dendrites and surrounded by primary a phase . The dendrite of α phase is fined by SiCp. Tensile strength at room temperature decreases with the increasing of SiCp addition. Tensile strength at elevated temperature increases with the addition of SiCp. Fracture of SiCp / ZA27 composites is the mixture of tough and brittle fracture. The carck is prone to extend along the interface and the region of dispersed shrinkage.