Development of Rheo-Diecasting of Al-Si Alloys Based on a Modified DSCP Process
An advanced rheo-diecasting technique, based on a modified multi-electromagnetic stirring continuous preparation (MSCP) process was developed for manufacturing near-net shape Al-alloys components with high integrity. The modified MSCP process innovatively combines noncontact electromagnetic stirring and an annular chamber with specially designed profiles to in situ make high quality semisolid slurry, and intensive forced shearing and self-wiping action can be achieved under high shear rate and high intensity of turbulence inside the annular chamber. Three Al-Si alloys with hypoeutectic, eutectic and hypereutectic compositions were tested in this study. The results indicate that, compared with those produced by conventional high-pressure diecasting (HPDC) process, rheo-diecasting samples based on the modified MSCP process have finer and more uniform microstructure.
G. Hirt, A. Rassili, A. Bührig-Polaczek
Z. F. Zhang et al., "Development of Rheo-Diecasting of Al-Si Alloys Based on a Modified DSCP Process", Solid State Phenomena, Vols. 141-143, pp. 185-190, 2008