Modification and refinement mechanism of Mg2Si phase in Srcontaining AZ61-0.7Si magnesium alloy |
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| Authors: | Yang Mingbo Shen Jia |
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| Affiliation: | 1. Materials Science and Engineering College, Chongqing Institute of Technology, Chongqing 400050, China;Materials Science and Engineering College, Chongqing University, Chongqing 400030, China
2. Materials Science and Engineering College, Chongqing Institute of Technology, Chongqing 400050, China |
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| Abstract: | 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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| Keywords: | AZ61-0.7Si magnesium alloy Sr Mg2Si phase modification and refinement |
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