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Evading strength-corrosion tradeoff in Mg alloys via dense ultrafine twins

Author

Listed:
  • Changjian Yan

    (Nanjing Tech University
    Institute of Corrosion Science and Technology)

  • Yunchang Xin

    (Nanjing Tech University)

  • Xiao-Bo Chen

    (RMIT University)

  • Daokui Xu

    (Chinese Academy of Sciences)

  • Paul K. Chu

    (City University of Hong Kong)

  • Chaoqiang Liu

    (Central South University)

  • Bo Guan

    (Chongqing University)

  • Xiaoxu Huang

    (Chongqing University)

  • Qing Liu

    (Nanjing Tech University)

Abstract

Conventional ultrafine-grains can generate high strength in Mg alloys, but significant tradeoff of corrosion resistance due to inclusion of a large number of non-equilibrium grain boundaries. Herein, an ultrafine-grain structure consisting of dense ultrafine twins is prepared, yielding a high strength up to 469 MPa and decreasing the corrosion rate by one order of magnitude. Generally, the formation of dense ultrafine twins in Mg alloys is rather difficult, but a carefully designed multi-directional compression treatment effectively stimulates twinning nucleation within twins and refines grain size down to 300 nm after 12-passes compressions. Grain-refinement by low-energy twins not only circumvents the detrimental effects of non-equilibrium grain boundaries on corrosion resistance, but also alters both the morphology and distribution of precipitates. Consequently, micro-galvanic corrosion tendency decreases, and severe localized corrosion is suppressed completely. This technique has a high commercial viability as it can be readily implemented in industrial production.

Suggested Citation

  • Changjian Yan & Yunchang Xin & Xiao-Bo Chen & Daokui Xu & Paul K. Chu & Chaoqiang Liu & Bo Guan & Xiaoxu Huang & Qing Liu, 2021. "Evading strength-corrosion tradeoff in Mg alloys via dense ultrafine twins," Nature Communications, Nature, vol. 12(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24939-3
    DOI: 10.1038/s41467-021-24939-3
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    Cited by:

    1. Chengbin Jin & Yiyu Huang & Lanhang Li & Guoying Wei & Hongyan Li & Qiyao Shang & Zhijin Ju & Gongxun Lu & Jiale Zheng & Ouwei Sheng & Xinyong Tao, 2023. "A corrosion inhibiting layer to tackle the irreversible lithium loss in lithium metal batteries," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    2. Qingchun Zhu & Yangxin Li & Fuyong Cao & Dong Qiu & Yao Yang & Jingya Wang & Huan Zhang & Tao Ying & Wenjiang Ding & Xiaoqin Zeng, 2022. "Towards development of a high-strength stainless Mg alloy with Al-assisted growth of passive film," Nature Communications, Nature, vol. 13(1), pages 1-8, December.

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