Modification and refinement mechanism of Mg2Si phase in Sr-containing AZ61-0.7Si magnesium alloy

Yang Mingbo; Shen Jia

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Modification and refinement mechanism of Mg2Si phase in Sr-containing AZ61-0.7Si magnesium alloy

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The effect of Sr on modification and refinement of the Mg2Si phase in an AZ61-0.78i magnesium alloy has been investigated and analyzed. The results indicate that Sr can effectively modify and refine the Chinese-script shaped Mg2Si phase in the AZ61-0.7Si alloy. By adding 0.06wt.%-0.12wt.%Sr to AZ61-0.7Si alloy, the Mg2Si phase in the alloy can be changed from the initial coarse Chinese-script shape to fine granule and/or irregular polygonal shapes. Accordingly, the Sr-containing AZ61-0.7Si alloy exhibits higher tensile and creep properties than the AZ61-0.7Si alloy without Sr modification. The mechanism on modification and refinement of the Mg2Si phase in St-containing AZ61-0.7Si alloy is possibly related to the following two aspects: (1) adding Sr may form the Al4Sr phase which can serve as the heterogeneous nucleus for the Mg2Si particles and/or (2) adding Sr may lower the onset crystallizing temperature and increase the undercooling level.

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《中国铸造》 |2009年第1期|37-42|共6页
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Yang Mingbo; Shen Jia;
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Materials Science and Engineering College, Chongqing Institute of Technology, Chongqing 400050, China;

Materials Science and Engineering College, Chongqing University, Chongqing 400030, China;

Materials Science and Engineering College, Chongqing Institute of Technology, Chongqing 400050, China;

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1. Modification and refinement mechanism of Mg_2Si phase in Sr-containing AZ61-0.7Si magnesium alloy [J] . Yang Mingbo ,Shen Jia . 中国铸造：英文版 . 2009,第1期
2. Comparison of Sb and Sr on modification and refinement of Mg_2Si phase in AZ61-0.7Si magnesium alloy [J] . 杨明波 ,潘复生 ,沈佳 . 中国有色金属学会会刊：英文版 . 2009,第2期
3. Modification and refinement effects of Sb and Sr on Mg_(17)Al_(12) and Mg_2Si phases in Mg-12Al-0.7Si alloy [J] . Zhi-wen Wang ,Hong-xia Wang ,Jia-lin Gong . 中国铸造：英文版 . 2016,第5期
4. Phase-field modeling of dendritic growth of magnesium alloys with a parallel-adaptive mesh refinement algorithm [J] . Bing-hui Tian ,Meng-wu Wu ,Ang Zhang . 中国铸造 . 2021,第006期
5. Sb、Ce复合变质对Mg2Si/Al-5Si复合材料中初生Mg2Si相的影响 [C] . Guo Fuqiang ,郭富强 ,Ren Bo . 第十六届全国特种铸造及有色合金学术年会暨十届全国铸造复合材料学术会议 . 2017
6. 微量元素变质对Al-Mg2Si合金中初生及共晶Mg2Si形态调控机制 [A] . 李超 . 2020

Modification and refinement mechanism of Mg2Si phase in Sr-containing AZ61-0.7Si magnesium alloy

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