Stress-dependent χ phase transformation in a Ni-based superalloy
Egan A, Gunda NS, Feng L, Ghazisaeidi M, Wang Y, Tin S, Mills MJ (2025)
Publication Language: English
Publication Type: Journal article
Publication year: 2025
Journal
Book Volume: 6
Article Number: 180
Journal Issue: 1
DOI: 10.1038/s43246-025-00895-z
Abstract
The ongoing push to elevate operating temperatures in aerospace gas turbine engines – driven by goals of enhanced fuel efficiency and reduced CO2 emissions – mandates advancements in the creep resistance of Ni- and Co-based superalloys, which are integral for critical engine components. This study elucidates the role of stress assisted localized phase transformations in the creep properties of these alloys. By leveraging chemo-mechanical coupling, self-healing γ′ precipitates are designed to immobilize planar defects, thereby increasing creep resistance. Employing advanced characterization techniques such as high-resolution Scanning Transmission Electron Microscopy (HR-STEM), in conjunction with atomistic simulations and thermodynamic calculations, novel deformation pathways facilitated by χ local phase transformation (LPT) strengthening have been uncovered; notably, the formation of χ nano-laths through microtwinning and superlattice intrinsic stacking fault (SISF) shearing. This study highlights critical insights into the compositional boundaries necessary for optimizing LPT strengthening while avoiding deleterious bulk formation of η/χ phases. These advancements will guide the design of new alloys maximizing high-temperature creep strength for advanced aerospace applications.
Authors with CRIS profile
Involved external institutions
Indian Institute of Technology (IIT), Delhi
India (IN)
Lawrence Livermore National Laboratory
United States (USA) (US)
Ohio State University
United States (USA) (US)
University of Arizona
United States (USA) (US)
India (IN)
Lawrence Livermore National Laboratory
United States (USA) (US)
Ohio State University
United States (USA) (US)
University of Arizona
United States (USA) (US)
How to cite
APA:
Egan, A., Gunda, N.S., Feng, L., Ghazisaeidi, M., Wang, Y., Tin, S., & Mills, M.J. (2025). Stress-dependent χ phase transformation in a Ni-based superalloy. Communications Materials, 6(1). https://doi.org/10.1038/s43246-025-00895-z
MLA:
Egan, Ashton, et al. "Stress-dependent χ phase transformation in a Ni-based superalloy." Communications Materials 6.1 (2025).
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