Microstructure-properties relationship of AS9U3?SiCp composites formed by sand and permanent mold casting

摘要

The present work deals with the mechanical behaviour of a commercial AS9U3/SiCp composite formed by sand and permanent mold casting. The corresponding unreinforced matrix was also formed in the same conditions. As cast and heat treated (T6)tensile test specimens were machined and tested at room and 300°temperatures. The results showed a finer microstructure for both materials formed by permanent mold casting, with improved properties for the composite over those obtained for theunreinforced matrix, although this improvement was more clearly shown at 3000. The highest mechanical properties were obtained with the T6 heat treatment for both materials formed by permanent mold casting.