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Effect of Cooling Path on Precipitation Behavior, Microstructure, and Texture Evolution of Micro-alloyed Magnesium Alloy

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Abstract

Alloying with rare-earth (RE) elements enhances the formability of magnesium (Mg) alloys, especially for the lower elevated temperatures. The beneficial effect brought by RE addition is related to texture modification. However, the complexity of the precipitation behavior in RE-containing alloy and the often excessive RE additions has impeded the understanding of the mechanism for RE texture modification. The current study is based on three micro-alloyed Mg-1Zn-xNd (wt.%) alloys with reduced levels of Nd, i.e., x = 0.1, 0.2, and 0.5 wt.%. Two different cooling paths were employed after solutionizing to achieve different precipitation conditions. The alloys were then subjected to hot rolling at 450 °C to a total reduction of 45% in two passes, and post-deformation annealing was also conducted. The precipitation behavior of the current alloy was discussed based on experimental observations and thermodynamic simulations. It was found that “dilute” Nd in solid solution is more effective in suppressing both dynamic and static recrystallization compared to Nd in the form of precipitates. Ultimately, a non-basal texture with basal poles splitting toward rolling direction and transverse direction was obtained for the Mg-1Zn-0.5Nd alloy after annealing. The mechanism of texture weakening effect was attributed to the presence of Nd in solid solution.

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Acknowledgments

The authors are grateful to the NSERC Strategic Project Grant for funding this project; Yang Liu is grateful to the Chinese Scholarship Council (CSC) for scholarship support and to McGill University for the award of McGill Engineering Doctoral Award (MEDA).

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Authors and Affiliations

  1. Department of Mining and Materials Engineering, McGill University, 3610 Rue University, Montreal, H3A 0C5, Canada

    Yang Liu, Rui Gao, Huiwen Geng & Stephen Yue

  2. Max-Planck-Institut Für Eisenforschung GmbH, Max-Planck-Straße 1, 40237, Düsseldorf, Germany

    Jing Su

  3. CanmetMATERIALS, 183 Longwood Road South, Hamilton, L8P 0A5, Canada

    Amjad Javaid

  4. Magna International, 750 Tower Drive, Troy, 48098-3000, USA

    Tim Skszek

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  1. Yang Liu
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Correspondence to Yang Liu.

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Liu, Y., Su, J., Gao, R. et al. Effect of Cooling Path on Precipitation Behavior, Microstructure, and Texture Evolution of Micro-alloyed Magnesium Alloy. J. of Materi Eng and Perform 29, 3560–3567 (2020). https://doi.org/10.1007/s11665-020-04718-9

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  • DOI: https://doi.org/10.1007/s11665-020-04718-9

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