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中文摘要：
Mg2Si 阶段的修正和精炼被认为是关键方面之一改进包含 Si 镁合金的机械性质。在这篇文章，微观结构上的 Sr 的效果，张力并且爬 AZ61-0.7Si 镁合金的性质被调查。结果显示那补充说到 AZ61-0.7Si 合金的 Sr 的小数量能修改，精制中国手迹在合金塑造 Mg2Si 阶段。在把 0.03wt%-0.09wt% Sr 加到 AZ61-0.7Si 合金以后，在合金的 Mg2Si 阶段从粗糙的中国手迹形状改变到好小粒或不规则的多角形的形状。在包含 Sr AZ61-0.7Si 合金的 Mg2Si 阶段的修正和精炼机制是可能，与生长率和为 Mg2Si 的成核比率的改进的减小有关，粒子在团结期间处理。由于 Mg2Si 阶段的修正和精炼，张力并且爬包含 Sr AZ61-0.7Si 合金的性质极大地被改进。
英文摘要：
The modification and refinement of Mg2Si phase is thought to be one of the key aspects to improve the mechanical properties of Si-containing magnesium alloys. In this article, the effects of Sr on the microstructure, tensile and creep properties of AZ61-0.7Si magnesium alloy were investigated. The results indicate that adding small amounts of Sr to AZ61-0.7Si alloy can modify and refine Chinese script shaped Mg2Si phases in the alloy. After adding 0.03wt%-0.09wt% Sr to AZ61-0.7Si alloy, the Mg2Si phases in the alloy change from the coarse Chinese script shape to fine granule and/or irregular polygonal shapes. The modification and refinement mechanisms of Mg2Si phases in Sr-containing AZ61-0.7Si alloys are possibly related to the reduction of growth rate and the enhancement of nucleation ratio for Mg2Si particles during the solidification process. Owing to the modification and refinement of Mg2Si phases, the tensile and creep properties of Sr-containing AZ61-0.7Si alloys are greatly improved.
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