The study of primary Si phase in spray forming hypereutectic Al–Si alloy

This paper is concerned mainly with the influence of the G/M ratio in the spray forming process on the size of the primary Si phase in hypereutectic Al–Si alloy. Before the hot extrusion process the growth of primary Si phase in as-deposited Al–Si alloy was observed with the increasing of the preheating temperature. The microstructure of the different samples which were extruded under the same temperature but at different extrusion ratio were compared, and the effects of the hot extrusion ratio on the refining of the primary Si phase which is distributed in the matrix of hypereutectic Al–Si alloy were discussed. According to the results of the present research the best process parameters are put forward.