Grain refinement of Mg-3Y alloy using Mg-10Al_2Y master alloy |
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| Authors: | Zhongtao Jiang Xiang Meng Bin Jiang Shan Jiang Jiahong Dai Jingren Dong Yongfeng Ding |
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| Affiliation: | 1. Chongqing Key Laboratory of Materials Surface & Interface Science, Chongqing University of Arts and Sciences, Chongqing 402160, China;2. College of Materials Science and Engineering, National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing 400044, China;3. Chongqing Academy of Science and Technology, Chongqing 401123, China;4. College of Mechanical and Electrical Engineering, Yangtze Normal University, Chongqing 408100, China |
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| Abstract: | The as-extruded Mg-10 Al_2 Y master alloy was chosen as a novel grain refiner for as-cast Mg-3 Y alloy.Contrast samples of cast Mg-3 Y alloy added with pure Al and Mg-Zr master alloy grain refiners were prepared under the same conditions.In this study,the influence of addition amounts of Al_2 Y and holding time on grain refinement efficiency as well as tensile properties was investigated.And the grain refining ability of the Al_2 Y particles was systematically evaluated in terms of the addition amounts,number density of the Al_2 Y particles and holding time.The finest grains are achieved at 2 wt% Al_2 Y addition amount,which corresponds to number density of the polygonal Al_2 Y particles of 420-460 mm~(-2).The Mg-10 Al_2 Y master alloy has significant refinement performance and no refining recession occurs at the holding time within 60 min,or the settling time up to 180 min.Grain refinement and the second phase strengthening of uniformly distributed Al_2 Y particles contribute to the simultaneous enhancement on both strength and elongation of Mg-3 Y alloy. |
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| Keywords: | Grain refinement Mg-Y alloys Microstructure Rare earths |
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