Abstract: It is generally one of the critical demands for developing light-weight, energy-saving, comfortable and diversified automobiles to optimize the microstructure and mechanical properties of A356 aluminum alloy. For further tapping the property potential of A356 aluminum alloy, the refinement and modification of the alloy was conducted by vacuum induction electromagnetic levitation melting, a clean and well controllable techno-logy with high energy density, and the comparison in treatment efficiency between the adopted approach and the conventional one was carried out as well. In light of the experimental results, vacuum induction electromagnetic levitation melting would facilitate the convert of the eutectic silicon phase from coarse and needle-like to fine spherical particles, and the particles were uniformly precipitated at the grain boundaries. α-Al phase was also significantly refined, presenting the regular rounded equiaxed crystal. During the process of vacuum induction electromagnetic levitation melting technology, nucleation work ΔG* made far more contribution than diffusion activation energy ΔGA. There was no peak value for supercooling degree. The nucleation rate I skyrocketed as the supercooling degree ΔT went up, giving rise to the burst nucleation of the melt. Meanwhile, the sheared, broken, crushed and proliferated dendrite arms induced by violent collision and convective motion between the grains enlarged the nucleation rate I, which eventually inherited into the solidified structure. Consequently, vacuum induction electromagnetic levitation melting exhibited superior refining and modification effect to conventional technique, and better mechanical properties of A356 aluminum alloy can be obtained as well.
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2019, Vol. 33 
