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Microstructural and Mechanical Stability of Gradient-Nanostructured Mg-Li Alloy During Thermal Exposure

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Abstract

Strain-induced gradient nanostructure formation is an effective method for improving the strength of Mg-Li alloys. However, the microstructural and resulting mechanical stability of gradient-nanostructured Mg-Li alloys during thermal exposure have never been studied, thereby limiting their successful application. In this study, we fabricated a gradient-nanostructured Mg-Li alloy by sliding friction treatment and investigated its microstructural and mechanical stability by annealing at different temperatures up to 250°C. The results showed that (1) the lattice parameter c of the Mg phases gradually decreased with increasing temperature, (2) the Mg-Li nanograins exhibited a significantly lower grain growth activation energy (72 kJ/mol) compared with other Mg-based alloys, and (3) the yield strength of the annealed samples was higher than that of the matrix due to synergetic strengthening of the gradient microstructures at the micron scale.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant No. 51701163, 51701166), Natural Science Basic Research Plan in Shaanxi Province of China (2019JQ-410), Key Research and Development Projects of Shaanxi Province (2020GY-292), and Innovation Team in key areas of Shaanxi Province (2016KCT-30). The authors thank Yongqing Fu for helpful discussions.

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  1. Northwest Institute for Nonferrous Metal Research, Xi’an, 710016, China

    Wei Zhang, Yan Du, Wangtu Huo & Jinwen Lu

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  1. Wei Zhang
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  2. Yan Du
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Zhang, W., Du, Y., Huo, W. et al. Microstructural and Mechanical Stability of Gradient-Nanostructured Mg-Li Alloy During Thermal Exposure. JOM 73, 1173–1179 (2021). https://doi.org/10.1007/s11837-021-04582-5

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