Fine-tuning the ductile-brittle transition temperature of Mg<sub>2</sub>Si intermetallic compound via Al doping

Ao Li; Xin-peng Zhao; Hai-you Huang; Yuan Ma; Lei Gao; Yan-jing Su; Ping Qian

doi:10.1007/s12613-019-1758-0

Volume 26 Issue 4

Apr. 2019

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 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

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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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Research Article

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

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Corresponding author:
Hai-you Huang E-mail: huanghy@mater.ustb.edu.cn
Received: 6 July 2018; Revised: 8 September 2018; Accepted: 13 September 2018

Abstract

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.
- Mg alloy;
- intermetallic compound;
- first-principles calculations;
- mechanical properties;
- ductile-brittle transition temperature

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