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Stretching the engineering strain of high strength LPSO quaternary Mg-Y-Zn-Al alloy via integration of nano-Al2O3

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Abstract

In the present study, an attempt is made for the first time to reinforce long-period stacking ordered (LPSO) MgY1.06Zn0.76Al0.42 (at.%) alloy with 0.5, 1.0, and 1.5 vol% of nano-Al2O3 particles to form nanocomposites. Microstructure characterization revealed the ability of nano-Al2O3 in inhibiting the formation of 14H LPSO phases in the nanocomposites during solidification. Homogenization at 723 K (450 °C) for 2 h led to the subsequent precipitation of fine Mg-Y-Zn-Al precipitates (≤1 µm) in the nanocomposites. The fine Mg-Y-Zn-Al precipitates and nano-Al2O3 particles were established to be active in promoting dynamic recrystallization (DRX) of α-Mg via particle-simulated nucleation during extrusion, which was responsible for weakening the basal texture in the nanocomposites and improving failure strain. As a result, failure strain was significantly increased from 10.8 % in the monolithic alloy to beyond 15 % in the nanocomposites with the highest strength among nanocomposites achieved in NC5 (nanocomposite reinforced with 0.5 vol% of nano-Al2O3 particles).

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Acknowledgements

The authors wish to acknowledge the funding support given by Singapore Technologies Kinetics Ltd and Singapore Economic Development Board under the Industrial Post-Graduate Programme (R 265 000 456 592) for carrying out this research work.

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Authors and Affiliations

  1. Singapore Technologies Kinetics Ltd (ST Kinetics), 249 Jalan Boon Lay, Singapore, 619523, Singapore

    XingHe Tan, Winston Keat How Chee, Jimmy Kwok Weng Chan & Richard Wai Onn Kwok

  2. Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore

    XingHe Tan & Manoj Gupta

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  1. XingHe Tan
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  2. Winston Keat How Chee
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  3. Jimmy Kwok Weng Chan
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  4. Richard Wai Onn Kwok
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  5. Manoj Gupta
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Correspondence to XingHe Tan.

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Tan, X., Chee, W.K.H., Chan, J.K.W. et al. Stretching the engineering strain of high strength LPSO quaternary Mg-Y-Zn-Al alloy via integration of nano-Al2O3 . J Mater Sci 51, 4160–4168 (2016). https://doi.org/10.1007/s10853-016-9742-9

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  • DOI: https://doi.org/10.1007/s10853-016-9742-9

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