Journal
CRYSTENGCOMM
Volume 15, Issue 9, Pages 1787-1793Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2ce26649k
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Funding
- Natural Science Foundation of China (NSFC) [51271086]
- National Key Technologies RD Program [2011BAE22B03]
- Author of Excellent PhD Thesis of Colleges and Universities in China [201148]
- Natural Science Foundation of Jilin Province [201115010]
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Octahedron and truncated octahedron primary Mg2Si were prepared by increasing the contents of Sb in an Al-Mg-Si melt. The structure and morphologies of primary Mg2Si were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FESEM). The modifier Sb plays an important role in determining their morphologies, which can transform from equiaxed-dendrite to octahedron and finally to truncated octahedron (tetrakaidecahedron) with an increase in Sb content. An adsorption model demonstrates that Sb atoms preferentially adsorb on {100} facets of the Mg2Si crystal, which is the key reason for the morphology evolution. Moreover, the growth processes of octahedron and truncated octahedron primary Mg2Si modified by Sb element have been revealed for the first time. Our study suggests that it is feasible to control the morphologies of primary Mg2Si crystals in metallic melts by a simple method modification, which is critical to the development of advanced structural alloys with high strength and toughness.
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