Micromechanical origin for the wide range of strength-ductility trade-off in metastable high entropy alloys†

Zongyang Lyu; Zehao Li; Taisuke Sasaki; Yanfei Gao; Ke An; Yan Chen; Dunji Yu; Kazuhiro Hono; Peter K. Liaw

doi:10.1016/j.scriptamat.2023.115439

Micromechanical origin for the wide range of strength-ductility trade-off in metastable high entropy alloys†

Zongyang Lyu, Zehao Li, Taisuke Sasaki, Yanfei Gao, Ke An, Yan Chen, Dunji Yu, Kazuhiro Hono, Peter K. Liaw

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Through different annealing temperatures and times, it is reported here that interstitial metastable high entropy alloys (HEAs) can exhibit a wide range of strength-ductility trade-offs. The underlying mechanisms were investigated via in situ neutron diffraction, electron backscattered diffraction, and electron channel contrast imaging analyses. These techniques revealed that the phase transformation process could be tuned by various annealing processes, resulting in different degrees of load partitioning and sharing among different phases and grain families on the commensurate microstructural length scales. Therefore, the microstructures generated by thermal treatments and phase transformation from face-centered-cubic to hexagonal-close-packed phases could efficiently improve the ductility of the studied alloys.

Original language	English
Article number	115439
Journal	Scripta Materialia
Volume	231
DOIs	https://doi.org/10.1016/j.scriptamat.2023.115439
State	Published - Jul 1 2023

Funding

This manuscript has been co-authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). ZL, PKL, and YG are grateful for the support from the US National Science Foundation (DMR 1809640). ZL also acknowledges a graduate fellowship from the Center for Materials Processing at the University of Tennessee. Neutron diffraction work was carried out at the Spallation Neutron Source (SNS), which is the U.S. Department of Energy (DOE) user facility at the Oak Ridge National Laboratory, sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences.

Keywords

metastable high entropy alloy
microstructures
neutron diffraction
strength-ductility tradeoff
transformation induced plasticity

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10.1016/j.scriptamat.2023.115439

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abstract = "Through different annealing temperatures and times, it is reported here that interstitial metastable high entropy alloys (HEAs) can exhibit a wide range of strength-ductility trade-offs. The underlying mechanisms were investigated via in situ neutron diffraction, electron backscattered diffraction, and electron channel contrast imaging analyses. These techniques revealed that the phase transformation process could be tuned by various annealing processes, resulting in different degrees of load partitioning and sharing among different phases and grain families on the commensurate microstructural length scales. Therefore, the microstructures generated by thermal treatments and phase transformation from face-centered-cubic to hexagonal-close-packed phases could efficiently improve the ductility of the studied alloys.",

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T1 - Micromechanical origin for the wide range of strength-ductility trade-off in metastable high entropy alloys†

AU - Lyu, Zongyang

AU - Li, Zehao

AU - Sasaki, Taisuke

AU - Gao, Yanfei

AU - An, Ke

AU - Chen, Yan

AU - Yu, Dunji

AU - Hono, Kazuhiro

AU - Liaw, Peter K.

PY - 2023/7/1

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N2 - Through different annealing temperatures and times, it is reported here that interstitial metastable high entropy alloys (HEAs) can exhibit a wide range of strength-ductility trade-offs. The underlying mechanisms were investigated via in situ neutron diffraction, electron backscattered diffraction, and electron channel contrast imaging analyses. These techniques revealed that the phase transformation process could be tuned by various annealing processes, resulting in different degrees of load partitioning and sharing among different phases and grain families on the commensurate microstructural length scales. Therefore, the microstructures generated by thermal treatments and phase transformation from face-centered-cubic to hexagonal-close-packed phases could efficiently improve the ductility of the studied alloys.

AB - Through different annealing temperatures and times, it is reported here that interstitial metastable high entropy alloys (HEAs) can exhibit a wide range of strength-ductility trade-offs. The underlying mechanisms were investigated via in situ neutron diffraction, electron backscattered diffraction, and electron channel contrast imaging analyses. These techniques revealed that the phase transformation process could be tuned by various annealing processes, resulting in different degrees of load partitioning and sharing among different phases and grain families on the commensurate microstructural length scales. Therefore, the microstructures generated by thermal treatments and phase transformation from face-centered-cubic to hexagonal-close-packed phases could efficiently improve the ductility of the studied alloys.

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Micromechanical origin for the wide range of strength-ductility trade-off in metastable high entropy alloys†

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