真空感应电磁悬浮熔炼对A356铝合金组织和性能的影响

doi:10.11896/cldb.18100146

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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 ΔG_A. 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.

Key words： A356 alloy refinement and modification vacuum induction electromagnetic levitation melting nucleation rate

Published: 16 September 2019

CLC number:

TG146.2

Fund:This work was financially supported by Doctoral Research Start-up Fee Fund of Huaiyin Institute of Technology (Z301B18558).

About author:: Zhengjun Wangreceived his Ph.D. degree in mate-rials science and engineering from the School of Mate-rials Science and Engineering of Jiangsu University in June 2016. He is currently an associate professor in Faculty of Mechanical and Material Engineering, Huai-yin Institute of Technology. His research interests are research and preparation of high-performance alloy materials, published more than 20 articles in important journals at home and abroad, and has authorized 5 invention patents.

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Cite this article:

WANG Zhengjun. Impact of Vacuum Induction Electromagnetic Levitation Melting on Microstructure and Properties of A356 Alloy[J]. Materials Reports, 2019, 33(22): 3801-3805.

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http://www.mater-rep.com/EN/10.11896/cldb.18100146 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3801

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