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<p>Intermetallic alloys, recognized for the long-range atomic ordering and resultant impressive mechanical properties, are highly sought after in various advanced fields, including aerospace, automotive, and nuclear energy. However, their widespread application is still hindered seriously due to the poor fatigue endurance. Here, we design a new-type L1<sub>2</sub>-structured multi-element symbiotic intermetallic alloy (MSIMA) and achieve a fatigue limit of ~1,100 MPa that remarkably surpasses its yield strength by 1.1 times, which is superior to other structural alloys currently in use. The complex sublattice occupation strengthens the alloy by increasing the antiphase boundary energy of the superlattice, thereby suppressing the fatigue-induced lattice defects. Concurrently, the multi-element symbiosis enables the modulation of local chemistries and the architecting of the disordered interfacial nanolayer (DINL) near grain boundaries, thereby shifting the fatigue fracture mode from intergranular to transgranular cracking. Furthermore, serving as the ductilizing sources, these DINLs facilitate the unusual anti-fatigue mechanisms—mechanical faulting and twinning—that are rarely observed in ordered alloys at room temperature. This deformation behavior effectively alleviates the strain localization and blunts the crack propagation, thereby enhancing their fatigue resistance.</p>

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Increasing fatigue resistance in ordered intermetallic alloys with multi-element symbiosis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月18日

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  • Qian Li,
  • Lijun Jing,
  • Fenghui Duan,
  • Yantao Sun,
  • Weibing Wang,
  • Biao Xu,
  • Dongpeng Hua,
  • Jianyang Zhang,
  • Zheling Shen,
  • Weihua Zhou,
  • Junhua Luan,
  • Peter K. Liaw,
  • Xiaodong Han,
  • Jian Lu,
  • Yilu Zhao,
  • Tao Yang

摘要

Intermetallic alloys, recognized for the long-range atomic ordering and resultant impressive mechanical properties, are highly sought after in various advanced fields, including aerospace, automotive, and nuclear energy. However, their widespread application is still hindered seriously due to the poor fatigue endurance. Here, we design a new-type L12-structured multi-element symbiotic intermetallic alloy (MSIMA) and achieve a fatigue limit of ~1,100 MPa that remarkably surpasses its yield strength by 1.1 times, which is superior to other structural alloys currently in use. The complex sublattice occupation strengthens the alloy by increasing the antiphase boundary energy of the superlattice, thereby suppressing the fatigue-induced lattice defects. Concurrently, the multi-element symbiosis enables the modulation of local chemistries and the architecting of the disordered interfacial nanolayer (DINL) near grain boundaries, thereby shifting the fatigue fracture mode from intergranular to transgranular cracking. Furthermore, serving as the ductilizing sources, these DINLs facilitate the unusual anti-fatigue mechanisms—mechanical faulting and twinning—that are rarely observed in ordered alloys at room temperature. This deformation behavior effectively alleviates the strain localization and blunts the crack propagation, thereby enhancing their fatigue resistance.