Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics

Huixin Jin, Jianxin Zhang*, Pan Li, Youjian Zhang, Wenyang Zhang, Jingyu Qin, Lihua Wang, Haibo Long, Wei Li, Ruiwen Shao, En Ma*, Ze Zhang, Xiaodong Han*


研究成果: Article査読

14 被引用数 (Scopus)


Understanding how topologically close-packed phases (TCPs) transform between one another is one of the challenging puzzles in solid-state transformations. Here we use atomic-resolved tools to dissect the transition among TCPs, specifically the μ and P (or σ) phases in nickel-based superalloys. We discover that the P phase originates from intrinsic (110) faulted twin boundaries (FTB), which according to first-principles calculations is of extraordinarily low energy. The FTB sets up a pathway for the diffusional in-flux of the smaller 3d transition metal species, creating a Frank interstitial dislocation loop. The climb of this dislocation, with an unusual Burgers vector that displaces neighboring atoms into the lattice positions of the product phase, accomplishes the structural transformation. Our findings reveal an intrinsic link among these seemingly unrelated TCP configurations, explain the role of internal lattice defects in facilitating the phase transition, and offer useful insight for alloy design that involves different complex phases.

ジャーナルNature communications
出版ステータスPublished - 2022 12月

ASJC Scopus subject areas

  • 物理学および天文学一般
  • 化学一般
  • 生化学、遺伝学、分子生物学一般


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