Modification of Primary Mg2Si in Mg-4Si Alloys with Antimony

• DOI: 10.1007/s11661-012-1317-z
• Publication Date: 2012-09-18T17:37:10Z
• Authors: Hui-Yuan Wang; Qian Li; Bo Liu; Nan Zhang; Lei Chen; Jin-Guo Wang; Qi-Chuan Jiang
• Keywords: 0205 materials engineering; 02 engineering and technology

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.