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Volume 26 Issue 4
Apr.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(4): 507-515
Ao Li, Xin-peng Zhao, Hai-you Huang, Yuan Ma, Lei Gao, Yan-jing Su,  and Ping Qian, Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping, Int. J. Miner. Metall. Mater., 26(2019), No. 4, pp. 507-515. https://doi.org/10.1007/s12613-019-1758-0
Cite this article as:
Ao Li, Xin-peng Zhao, Hai-you Huang, Yuan Ma, Lei Gao, Yan-jing Su,  and Ping Qian, Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping, Int. J. Miner. Metall. Mater., 26(2019), No. 4, pp. 507-515. https://doi.org/10.1007/s12613-019-1758-0
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研究论文

Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping

  • Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

  • Corrosion and Protection Center, Key Laboratory for Environmental Fracture of Ministry of Education, University of Science and Technology Beijing, Beijing 100083, China

  • Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China

  • Department of Physics, University of Science and Technology Beijing, Beijing 100083, China

  • 通讯作者:

    Hai-you Huang    E-mail: huanghy@mater.ustb.edu.cn

  • Brittleness is a dominant issue that restricts potential applications of Mg2Si intermetallic compounds (IMC). In this paper, guided by first-principles calculations, we found that Al doping will enhance the ductility of Mg2Si. The underlying mechanism is that Al doping could reduce the electronic exchange effect between Mg and Si atoms, and increase the volume module/shear modulus ratio, both of which are beneficial to the deformation capability of Mg2Si. Experimental investigations were then carried out to verify the calculation results with Al doping contents ranging from Al-free to 10wt%. Results showed that the obtained ductile-brittle transition temperature of the Mg2Si-Al alloy decreased and the corresponding ductility increased. Specifically, the ductile-brittle transition temperature could be reduced by about 100℃. When the content of Al reached 6wt%, α-Al phase started to precipitate, and the ductile-brittle transition temperature of the alloy no longer decreased.
    • Research Article

    Fine-tuning the ductile-brittle transition temperature of Mg2Si intermetallic compound via Al doping

    + Author Affiliations
      Abstract
    • Brittleness is a dominant issue that restricts potential applications of Mg2Si intermetallic compounds (IMC). In this paper, guided by first-principles calculations, we found that Al doping will enhance the ductility of Mg2Si. The underlying mechanism is that Al doping could reduce the electronic exchange effect between Mg and Si atoms, and increase the volume module/shear modulus ratio, both of which are beneficial to the deformation capability of Mg2Si. Experimental investigations were then carried out to verify the calculation results with Al doping contents ranging from Al-free to 10wt%. Results showed that the obtained ductile-brittle transition temperature of the Mg2Si-Al alloy decreased and the corresponding ductility increased. Specifically, the ductile-brittle transition temperature could be reduced by about 100℃. When the content of Al reached 6wt%, α-Al phase started to precipitate, and the ductile-brittle transition temperature of the alloy no longer decreased.
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