Abstract: 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.
Key words: SiCp/ZA27
composite Solidification microstructure Fracture morphology
*
This project
is supported by Provincial Science and Technology Committee of Jiangsu (No.
BJ97062). Manuscript received on October 26, 1999; revised manuscript
July 15, 2000
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