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| Effect of Al- and Ce-content on Microstructure of Mg-Al Magnesium Alloys |
Renju CHENG1( ), Hanwu DONG1(), Wenjun LIU1, Bin JIANG1,2, Shutao XIONG2, Bo LIU3, Fusheng PAN1,2 |
1 Chongqing Academy of Science and Technology, Chongqing 401123, China
2 College of Materials Science & Engineering, Chongqing University, Chongqing 400030, China
3 Chongqing Application Technology Co. Ltd, Chongqing 401123, China |
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Cite this article:
Renju CHENG, Hanwu DONG, Wenjun LIU, Bin JIANG, Shutao XIONG, Bo LIU, Fusheng PAN. Effect of Al- and Ce-content on Microstructure of Mg-Al Magnesium Alloys. Chinese Journal of Materials Research, 2017, 31(10): 737-742.
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Abstract The effect of Al- and Ce-content on the microstructure and the evolution of second phases of Mg-alloys Mg-Al-Ce were investigated, while the relevant mechanism related with the formation of intermetallic phases and the grain refinement of alloys were analyzed thermodynamically. The results show that the addition of certain amount of Ce can effectively refine the grain size of Mg-Al alloys, while with the addition of 2.5% Al and 2% Ce, the grain size could be decreased from 1000 μm for pure Mg to 280 μm for the alloy Mg-Al-Ce. According to the data fitting of experimental results the optimum content (in mass fraction) of Al and Ce were 6.4%~7% and 1.6%~2% respectively,the grain size can be reduced to 160 μm. Results of experiment and thermodynamics calculation indicated that intermetallic compounds of Al-Ce have smaller formation enthalpy than that of Mg-Ce and Mg-Al, and the phase Al4Ce preferentially formed in the melts while the small intermetallic compounds Al4Ce adsorbed on the α-Mg grains leading the formation of lamellar eutectic, which can hindered the growth of α-Mg grain and so as to refined the grains.
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Received: 10 October 2016
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| Fund: Supported by National Key R&D Program of China (No.2016YFB0301100);National Natural Science Foundation of China (No.51504052), Chongqing Science and Technology Training Program for Young Talent (No.cstc2014jcyjjq50002);Chongqing Science Foundation for Distinguished Young Scholars (No.cstc2014jcyjjq50002) |
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