【摘 要】
：
The modification and refinement of Mg2Si phase is thought to be one of the key aspects to improve the mechanical prop-erties of Si-containing magnesium alloys.I
【机 构】
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Materials Science and Engineering College
【基金项目】
：
国家杰出青年科学基金;MajorState Basic Research and Development Program of China;重庆市自然科学基金;Chongqing Science and Technology Commission in China
论文部分内容阅读
The modification and refinement of Mg2Si phase is thought to be one of the key aspects to improve the mechanical prop-erties of Si-containing magnesium alloys.In this article,the effects of Sr on the microstructure,tensile and creep properties ofAZ61-0.7Si magnesium alloy were investigated.The results indicate that adding small amounts of Sr to AZ6 l-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 refine-ment of Mg2Si phases,the tensile and creep properties of Sr-containing AZ61-0.7Si alloys are greatly improved.
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