Modification of Primary Mg2Si in Mg-4Si Alloys with Antimony
Modification of Primary Mg2Si in Mg-4Si Alloys with Antimony
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DOI：
10.1007/s11661-012-1317-z
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发表时间：
2012-12-01
影响因子：
2.8
通讯作者：
Jiang, Qi-Chuan
中科院分区：
文献类型：
--
作者：
Wang, Hui-Yuan;Li, Qian;Jiang, Qi-Chuan
初生Mg_2Si的细化和形态变化与合金中的Sb含量有很大关系。在熔体中加入Sb可明显增加初生镁硅晶体的核数。此外，由于晶格中的Sb取代了晶格中的Sb，使得枝晶中的择优生长受到了很大的限制，导致变质初晶生长为被{111}晶面包围的八面体形态，因此，变质过程可以称为吸附和中毒机制。
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.