Spray casting of Al-25Si alloy and hot deformation behavior

Abstract

The spray forming process was used to produce Al-25Si alloy in this study. The microstructure of the hypereutectic Al-25Si alloy appeared to consist of Al matrix and equiaxed Si particles with average diameter of 5similar to7 mum. To deduce the extrusion condition, a series of compression tests has been conducted at temperatures ranging from RT to 500degreesC. The strain rate sensitivity parameter (m) of this alloy has been found to be very low (less than or equal to0.1) below 300degreesC and reached maximum value of about 0.13 at 500degreesC. The extrusion has been successfully conducted at the temperatures of 300degreesC and above with the ratio of area reduction of 28 and 40. The processing map for hot working has also been constructed.