Abstract
In this study, the Al-Ti-B-RE and Al-10Sr master alloy addition effects on refinement and modification performances of A356 alloys were investigated. The results demonstrated that the refinement and modification performances of the master alloy reduced along with the remelting times and the heat preservation duration increased. Following the fifth remelting, the A356 grain size was 130 μm, the secondary dendrite spacing was 13.4 μm, the tensile strength was 158 MPa, the elongation was 4.3 % and the brinell hardness was 70 HB. The mechanical performance decreased significantly compared to that of the A356 alloy without remelting. The heat preservation duration had a less significant effect on the A356 alloy properties than that of the remelting times. The secondary phase growth included the AlTi3, TiB2 and Ti2Al20Re phases in the Al-5Ti-B-RE master alloy. In addition, the Sr adsorption quantity was declined on the Si phase surface. These were the two main reasons for the degradation of the refinement and modification performances of A356 alloys.
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