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Modeling the precipitation processes and the formation of hierarchical microstructures in a single crystal high entropy superalloy

Authors :
Hideyuki Murakami
Wei Che Hsu
An-Chou Yeh
Stéphane Gorsse
Yung Ta Chen
Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB)
Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
Department of Materials Science and Engineering
National Tsing Hua University [Hsinchu] (NTHU)
High Entropy Materials Center
Research Center for Structural Materials
National Institute for Materials Science (NIMS)
Department of Nanoscience and Nanoengineering
Waseda University
Authors would like to thank Dr. K. Kawagishi and Mr. Y. Takada from National Institute for Materials Science (NIMS) for single crystal casting supply. And, authors acknowledge funding supports from Ministry of Science and Technology (MOST) in Taiwan under Grant MOST108-2218-E-007-005, MOST109-2634-F-007-024, and MOST109-2811-E-007-500
the 'High Entropy Materials Center' from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education.
Source :
Scripta Materialia, Scripta Materialia, Elsevier, 2021, 193, pp.147-152. ⟨10.1016/j.scriptamat.2020.11.002⟩
Publication Year :
2021
Publisher :
HAL CCSD, 2021.

Abstract

International audience; Although superior high temperature tensile yield strength of high entropy superalloys (HESAs) arises from their hierarchical microstructure, the precipitation processes driving its formation remains unclear. In the present study, we analyze the kinetics of γ’ and γ precipitations by treating the concurrent nucleation, growth and coarsening using common computational thermodynamic and kinetic tools to simulate the microstructure genesis and evolution in HESA during thermal treatments. The ability of the simulations to reproduce the experimentally observed microstructure parameters is evaluated. Temperature-time-transformation (TTT) diagrams are calculated to serve as guidelines for further optimization of the hierarchical microstructure of HESAs.

Details

Language :
English
ISSN :
13596462
Database :
OpenAIRE
Journal :
Scripta Materialia, Scripta Materialia, Elsevier, 2021, 193, pp.147-152. ⟨10.1016/j.scriptamat.2020.11.002⟩
Accession number :
edsair.doi.dedup.....62266b771f7db4ce9dfe05a6f540d913
Full Text :
https://doi.org/10.1016/j.scriptamat.2020.11.002⟩