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Refinement and modification of primary Mg2Si in Al-20Mg2Si alloy by a combined addition of yttrium and antimony

Abstract

The complex modification of primary Mg2Si in an Al-20Mg2Si alloy by simultaneous additions of yttrium (Y) and antimony (Sb) was investigated in the present work. It was found that the combined addition of 0.5 wt.% Y-Sb had a more significant modifying effect than single addition of equivalent amount of Y or Sb. After modification, coarse Mg2Si dendrites were changed into fine polyhedral with an average size decreasing from 86 to less than 18µm. It has been demonstrated that Sb participated in the formation of Mg3Sb2, which act as heterogeneous nuclei of primary Mg2Si and hence significantly refine their sizes. Meanwhile, Y could obviously adsorb and poison the preferred growth along <100> directions of primary Mg2Si crystal, and hence not only changed the final morphology to truncated octahedron but also reduced their sizes. Furthermore, the skeleton-type growth process of the truncated octahedral primary Mg2Si in the Al-20Mg2Si alloy co-modified by 0.5 wt.% Y-Sb was also revealed. Our study provided a new insight in designing more efficient modifiers by a combined addition of refiner (e.g. Sb) and growth inhibitor (e.g. Y), which is critical to tailor new light-weight alloys with high strength and toughness.

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Publication details

The article was received on 18 Jul 2017, accepted on 21 Sep 2017 and first published on 21 Sep 2017


Article type: Paper
DOI: 10.1039/C7CE01309D
Citation: CrystEngComm, 2017, Accepted Manuscript
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    Refinement and modification of primary Mg2Si in Al-20Mg2Si alloy by a combined addition of yttrium and antimony

    H. Wang, J. Zhu, J. Li, C. Li, M. Zha, C. Wang, Z. Yang and Q. Jiang, CrystEngComm, 2017, Accepted Manuscript , DOI: 10.1039/C7CE01309D

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