2013 Volume 53 Issue 3 Pages 468-475
A new slurry-making method consisting of two-stages of electro-magnetic(EM) stirring, was developed to manufacture high-quality slurries for rheo-diecasting of a near eutectic Al–Si based piston alloy. In the 1st stage of EM stirring, the optimized process conditions, such as the pouring temperature and the EM induction intensity were investigated to control the microstructural evolution of the primary Si particles. The 2nd stage of EM stirring was carried out to obtain fine and uniform globular α-Al particles and intermetallic compounds. High quality slurries with fine and uniform microstructures for rheo-diecasting can be obtained through the two-stages of EM stirring. Mechanical properties, such as hardness, high temperature tensile strength and relative wear resistance were evaluated on the specimens taken from the rheo-diecast products, and the results are compared with those of the conventional metal mold cast piston.
