Abstract
The effect of semi-solid processing on microstructures and mechanical properties of rheo-sulrries A356 sand cast produced by Gas Induce Semi-Solid (GISS) process was investigated. Step plate sand molds were used in this study. The results found that the initial solid fraction of rheo-slurries did not influence on the non dendritic α-Al phase size of the as-cast alloy, while no initial solid fraction of low temperature conventional casting specimens obtained dendritic α-Al phase microstructure. In addition, both α-Al phase size and dendrite arm spacing increased with increasing the casting modulus. Tensile strengths and elongations of rheo-slurry casting specimens are higher than that of conventional casting specimens. This study indicates that low initial solid fraction slurry is suitable for gravity sand casting due to higher feeding time of this alloy and obtain the highest quality index value of 400 (tensile strength of 281 MPa and elongation of 6.1%).
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