Abstract
Al-20Si alloy specimens were manufactured using high pressure solidification. The microstructure, the mechanical properties as well as the strengthening mechanisms of the alloy were investigated. The results show that the primary Si phase disappears, the supersaturated α-Al prevails, and the eutectic Si phase is well refined after high pressure solidification. The ultimate tensile strength (UTS), the yield strength (YS) and the elongation increase gradually with increasing solidification pressure and the values of the Al-20Si alloy solidified at 3 GPa are 365 MPa, 237 MPa and 2.98%, respectively, corresponding to an increase of 83%, 57%, and 412% compared with the alloy solidified at atmospheric pressure. The alloy solidified at atmospheric pressure shows typical cleavage fracture, whereas the alloy solidified at 3 GPa exhibits quasi-cleavage fracture. Solid solution strengthening is the dominating strengthening mechanism after high pressure solidification.
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