TY - JOUR
T1 - Atomistic mechanism of phase transformation between topologically close-packed complex intermetallics
AU - Jin, Huixin
AU - Zhang, Jianxin
AU - Li, Pan
AU - Zhang, Youjian
AU - Zhang, Wenyang
AU - Qin, Jingyu
AU - Wang, Lihua
AU - Long, Haibo
AU - Li, Wei
AU - Shao, Ruiwen
AU - Ma, En
AU - Zhang, Ze
AU - Han, Xiaodong
N1 - Funding Information:
NSFC programs (91860202, 52071003, 11604006, 51771102, 51971118, 52171001). The authors at BJUT wish to acknowledge the financial supports of Basic Science Center Program for Multiphase Evolution in Hyper-gravity of the National Natural Science Foundation of China (51988101), Beijing Municipal Education Commission Project (PXM2020_014204_000021 and PXM2019_014204_500032), Beijing Outstanding Young Scientists Projects (BJJWZYJH01201910005018), Beijing Natural Science Foundation (Z180014), and the “111”project (DB18015). E.M. acknowledges XJTU for supporting his work at CAID. The authors acknowledge Analysis and Testing Center in Beijing Institute of Technology.
Funding Information:
NSFC programs (91860202, 52071003, 11604006, 51771102, 51971118, 52171001). The authors at BJUT wish to acknowledge the financial supports of Basic Science Center Program for Multiphase Evolution in Hyper-gravity of the National Natural Science Foundation of China (51988101), Beijing Municipal Education Commission Project (PXM2020_014204_000021 and PXM2019_014204_500032), Beijing Outstanding Young Scientists Projects (BJJWZYJH01201910005018), Beijing Natural Science Foundation (Z180014), and the “111”project (DB18015). E.M. acknowledges XJTU for supporting his work at CAID. The authors acknowledge Analysis and Testing Center in Beijing Institute of Technology.
Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85129364403&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85129364403&partnerID=8YFLogxK
U2 - 10.1038/s41467-022-30040-0
DO - 10.1038/s41467-022-30040-0
M3 - Article
C2 - 35513380
AN - SCOPUS:85129364403
SN - 2041-1723
VL - 13
JO - Nature communications
JF - Nature communications
IS - 1
M1 - 2487
ER -