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 and Xiaodong Han ()
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Huixin Jin: Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
Jianxin Zhang: Shandong University
Pan Li: Shandong University
Youjian Zhang: Shandong University
Wenyang Zhang: Shandong University
Jingyu Qin: Shandong University
Lihua Wang: Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
Haibo Long: Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
Wei Li: Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
Ruiwen Shao: Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Engineering Medicine, Beijing Institute of Technology
En Ma: Center for Alloy Innovation and Design (CAID), State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University
Ze Zhang: Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology
Xiaodong Han: Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract 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.

Date: 2022
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DOI: 10.1038/s41467-022-30040-0

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