Comparison of Sb and Sr on modification and refinement of Mg2Si phase in AZ61-0.7Si magnesium alloy

The effects of Sb and Sr on the modification and refinement of Mg2Si phase in an AZ61-0.7Si magnesium alloy were investigated and compared. The results indicate that the difference of Sb and Sr in the modification and refinement of Mg2Si phase is significant. Addition of 0.4%Sb （mass fraction） to AZ...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009-04, Vol.19 (2), p.287-292
Main Author: 杨明波 潘复生 沈佳 白亮
Format: Article
Language:English
Subjects:
Mg2Si
多边形
晶化温度
蠕变性能
质量分数
镁合金
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Summary:The effects of Sb and Sr on the modification and refinement of Mg2Si phase in an AZ61-0.7Si magnesium alloy were investigated and compared. The results indicate that the difference of Sb and Sr in the modification and refinement of Mg2Si phase is significant. Addition of 0.4%Sb （mass fraction） to AZ61-0.7Si alloy can refine but not modify Mg2Si phase. Oppositely, by addition of 0.12%Sr to AZ61-0.7Si alloy, the Mg2Si phase changes from initial coarse Chinese script shape to fine granule and/or irregular polygonal shape. Accordingly, the St-modified AZ61-0.7Si alloy exhibits higher tensile and creep properties than the Sb-modified one. The difference of Sb and Sr in the modification and refinement of Mg2Si phase is possibly related to the following two aspects： 1） the disregistry at （100）A14Sr//（100）Mg2Si is lower than that at （0001）Mg3Sb2//（111）Mg2Si （0.69% vs 1.72%） and 2） the onset crystallizing temperature of the Sr-modified AZ61-0.7Si alloy is lower than that of the Sb-modified one （603.1 ℃ vs 606.9 ℃）.
ISSN:1003-6326
DOI:10.1016/s1003-6326(08)60266-6