Journal
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
Volume 43A, Issue 13, Pages 4926-4932Publisher
SPRINGER
DOI: 10.1007/s11661-012-1317-z
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Funding
- Special Fund for the Author of Excellent PhD Thesis of Colleges and Universities in China [201148, 2007B38]
- National Basic Research Program of China (973 Program) [2012CB619600]
- NSF of Jilin Province [201115010]
- Foundation of Jilin University for Distinguished Young Scholars
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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 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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