Abstract
The refinement in size and modification in morphology for primary Mg2Si depended significantly on Sb contents in Mg-4Si alloys. Adding Sb into melts evidently increased the nucleus numbers of primary Mg2Si crystals. Moreover, the preferential growth along \( \left\langle { 100} \right\rangle \) directions in dendritic crystals was restricted greatly due to the Si sites being substituted by Sb in Mg2Si lattices, resulting in modified primary Mg2Si crystals growing to octahedral morphology surrounded by {111} planes; therefore, the modification process could be called adsorption and poisoning mechanisms.
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Acknowledgments
This work is supported by The Special Fund for the Author of Excellent PhD Thesis of Colleges and Universities in China (201148, 2007B38) and The National Basic Research Program of China (973 Program) (Grant No. 2012CB619600). Partial financial support comes from The NSF of Jilin Province (Grant No. 201115010) and The Foundation of Jilin University for Distinguished Young Scholars.
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Wang, HY., Li, Q., Liu, B. et al. Modification of Primary Mg2Si in Mg-4Si Alloys with Antimony. Metall Mater Trans A 43, 4926–4932 (2012). https://doi.org/10.1007/s11661-012-1317-z
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DOI: https://doi.org/10.1007/s11661-012-1317-z