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<p>This study investigates the influence of phase constitution on the hydrogen embrittlement (HE) behavior of the AlCoCr<sub>0.5</sub>FexNi<sub>2.5</sub> (x = 1.5, 2.5, and 3.5, hereafter denoted as Fex) high-entropy alloys (HEAs) through tensile testing and electrochemical hydrogen charging experiments. Unlike previous studies focusing primarily on single-phase HEAs or duplex stainless steels, this work systematically explores the role of FCC/BCC phase fraction in dual-phase HEAs, providing new insights into the design of HE-resistant materials with balanced strength and ductility. The results reveal that increasing the FCC phase fraction significantly reduces plasticity loss in hydrogen-charged samples, while the depth of hydrogen-affected zones (HAZs) decreases with higher FCC content. This study demonstrates that tailoring phase constitution in dual-phase HEAs can effectively mitigate hydrogen-induced damage, offering a novel strategy for developing advanced materials in hydrogen environments.</p>

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Effect of Phase Constitution on Hydrogen Embrittlement Resistance of Dual-Phase AlCoCr0.5FexNi2.5 High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年9月25日

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  • Menglu Jian,
  • Min Liu,
  • Jie Luo,
  • Bingliang Liang

摘要

This study investigates the influence of phase constitution on the hydrogen embrittlement (HE) behavior of the AlCoCr0.5FexNi2.5 (x = 1.5, 2.5, and 3.5, hereafter denoted as Fex) high-entropy alloys (HEAs) through tensile testing and electrochemical hydrogen charging experiments. Unlike previous studies focusing primarily on single-phase HEAs or duplex stainless steels, this work systematically explores the role of FCC/BCC phase fraction in dual-phase HEAs, providing new insights into the design of HE-resistant materials with balanced strength and ductility. The results reveal that increasing the FCC phase fraction significantly reduces plasticity loss in hydrogen-charged samples, while the depth of hydrogen-affected zones (HAZs) decreases with higher FCC content. This study demonstrates that tailoring phase constitution in dual-phase HEAs can effectively mitigate hydrogen-induced damage, offering a novel strategy for developing advanced materials in hydrogen environments.