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Effect of Sr addition on the grain refinement of AZ31 magnesium alloys |
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| Authors: | Renju Cheng Fusheng Pan Shan Jiang Cheng Li Bing Jiang and Xianquan Jiang |
| Institution: | Chongqing Academy of Science and Technology, Chongqing 401123, China;Chongqing Academy of Science and Technology, Chongqing 401123, China,College of Materials Science & Engineering, Chongqing University, Chongqing 400030, China;Chongqing Academy of Science and Technology, Chongqing 401123, China;Chongqing Academy of Science and Technology, Chongqing 401123, China;Chongqing Academy of Science and Technology, Chongqing 401123, China,College of Materials Science & Engineering, Chongqing University, Chongqing 400030, China;Chongqing Academy of Science and Technology, Chongqing 401123, China |
| Abstract: | The grain refinement mechanisms of Sr in the AZ31 magnesium alloys were studied by both phase diagram calculation and experimental analysis. The influence of Sr content on the solute distribution coefficients of Al and Zn during solidification was investigated in order to find out whether Sr addition can enhance the grain refinement efficiency brought by Al and Zn. The results showed that Sr addition can promote the segregation in liquid phases for both Al and Zn during solidification, therefore enhance the grain refinement effects by Al and Zn in AZ31 magnesium alloys. And the effect of Sr addition on the solute distribution coefficients for Al is larger than that of Zn. Sr addition can improve the GRF values by itself and also improve the GRF values of Al and Zn to the AZ31 magnesium alloys, and the grains are refined consequently. |
| Keywords: | Sr AZ31 magnesium alloy Grain refinement mechanism |
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