Switching nanoprecipitates to resist hydrogen embrittlement in high-strength aluminum alloys

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  • Wang, Yafei
    Department of Mechanical Engineering, Kyushu University School of Chemical Engineering and Technology, Xi’an Jiaotong University
  • Sharma, Bhupendra
    Department of Mechanical Engineering, Kyushu University
  • Xu, Yuantao
    Department of Mechanical Engineering, Kyushu University Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University
  • Shimizu, Kazuyuki
    Department of Physical Science and Materials Engineering, Iwate University
  • Fujihara, Hiro
    Department of Mechanical Engineering, Kyushu University
  • Hirayama, Kyosuke
    Department of Materials Science and Engineering, Kyoto University
  • Takeuchi, Akihisa
    Japan Synchrotron Radiation Research Institute
  • Uesugi, Masayuki
    Japan Synchrotron Radiation Research Institute
  • Cheng, Guangxu
    School of Chemical Engineering and Technology, Xi’an Jiaotong University,
  • Toda, Hiroyuki
    Department of Mechanical Engineering, Kyushu University

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Hydrogen drastically embrittles high-strength aluminum alloys, which impedes efforts to develop ultrastrong components in the aerospace and transportation industries. Understanding and utilizing the interaction of hydrogen with core strengthening elements in aluminum alloys, particularly nanoprecipitates, are critical to break this bottleneck. Herein, we show that hydrogen embrittlement of aluminum alloys can be largely suppressed by switching nanoprecipitates from the η phase to the T phase without changing the overall chemical composition. The T phase strongly traps hydrogen and resists hydrogen-assisted crack growth, with a more than 60% reduction in the areal fractions of cracks. The T phase-induced reduction in the concentration of hydrogen at defects and interfaces, which facilitates crack growth, primarily contributes to the suppressed hydrogen embrittlement. Transforming precipitates into strong hydrogen traps is proven to be a potential mitigation strategy for hydrogen embrittlement in aluminum alloys.

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