Strong and ductile refractory high-entropy alloys with super formability

Cheng Zhang; Haoren Wang; Xinyi Wang; Yuanbo T. Tang; Qin Yu; Chaoyi Zhu; Mingjie Xu; Shiteng Zhao; Rui Kou; Xin Wang; Benjamin E. Macdonald; Roger C. Reed; Kenneth S. Vecchio; Penghui Cao; Timothy J. Rupert; Enrique J. Lavernia

doi:10.1016/j.actamat.2022.118602

Strong and ductile refractory high-entropy alloys with super formability

Cheng Zhang, Haoren Wang, Xinyi Wang, Yuanbo T. Tang, Qin Yu, Chaoyi Zhu, Mingjie Xu, Shiteng Zhao, Rui Kou, Xin Wang, Benjamin E. Macdonald, Roger C. Reed, Kenneth S. Vecchio, Penghui Cao, Timothy J. Rupert, Enrique J. Lavernia^*

^*Corresponding author for this work

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

Abstract

Refractory high-entropy alloys (RHEAs) are considered promising candidate materials for high-temperature structural applications that currently use superalloys. However, for most of the reported RHEAs, their poor ductility and negligible cold-workability at room temperature have hindered their use. Here, we report a new class of non-equiatomic NbTaTi-based RHEAs that can be cold-rolled to a reduction of over 90% from the as-cast state without surface treatment and/or intermediate annealing. This excellent cold-workability is facilitated by activation of a high-density of dislocations and deformation twins as well as by high diffusivity paths, such that these RHEAs can be rendered homogeneous at lower annealing temperatures for much shorter time durations. In addition, we report that the RHEAs retain their high strength at elevated temperatures and exhibit considerable ductility at cryogenic conditions, evading the traditional strength–ductility trade-off. This class of super-formable RHEAs provides a novel design pathway to fabricate high-temperature structural materials via an energy- and time-saving method.

Original language	English
Article number	118602
Number of pages	11
Journal	Acta Materialia
Volume	245
Early online date	8 Dec 2022
DOIs	https://doi.org/10.1016/j.actamat.2022.118602
Publication status	Published - 15 Feb 2023

Bibliographical note

Acknowledgments:
C.Z., BEM and E.J.L. would like to acknowledge financial support from UCI. This research was also partially supported (EJL, X.W., BEM and TJR) by the National Science Foundation Materials Research Science and Engineering Center program through the UC Irvine Center for Complex and Active Materials (DMR-2011967). Xinyi W. and P.C. acknowledge financial support from National Science Foundation (DMR-2105328, CMMI-1935371). We also would like to thank Dr. Fan Ye, Dr. Li. Xing, and Dr. Jian-guo Zheng (IMRI, UC Irvine) for TEM assistance. We acknowledge Dr. Mingde Qin and Xiao Liu (UC San Diego) for assistance in some experiments.

Keywords

Refractory high-entropy alloys
Formability
Cryogenic-to-elevated temperatures
Strength-ductility synergy

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@article{86fa4bdf3564454fb24f92edae39b914,

title = "Strong and ductile refractory high-entropy alloys with super formability",

abstract = "Refractory high-entropy alloys (RHEAs) are considered promising candidate materials for high-temperature structural applications that currently use superalloys. However, for most of the reported RHEAs, their poor ductility and negligible cold-workability at room temperature have hindered their use. Here, we report a new class of non-equiatomic NbTaTi-based RHEAs that can be cold-rolled to a reduction of over 90% from the as-cast state without surface treatment and/or intermediate annealing. This excellent cold-workability is facilitated by activation of a high-density of dislocations and deformation twins as well as by high diffusivity paths, such that these RHEAs can be rendered homogeneous at lower annealing temperatures for much shorter time durations. In addition, we report that the RHEAs retain their high strength at elevated temperatures and exhibit considerable ductility at cryogenic conditions, evading the traditional strength–ductility trade-off. This class of super-formable RHEAs provides a novel design pathway to fabricate high-temperature structural materials via an energy- and time-saving method.",

keywords = "Refractory high-entropy alloys, Formability, Cryogenic-to-elevated temperatures, Strength-ductility synergy",

author = "Cheng Zhang and Haoren Wang and Xinyi Wang and Tang, {Yuanbo T.} and Qin Yu and Chaoyi Zhu and Mingjie Xu and Shiteng Zhao and Rui Kou and Xin Wang and Macdonald, {Benjamin E.} and Reed, {Roger C.} and Vecchio, {Kenneth S.} and Penghui Cao and Rupert, {Timothy J.} and Lavernia, {Enrique J.}",

note = "Acknowledgments: C.Z., BEM and E.J.L. would like to acknowledge financial support from UCI. This research was also partially supported (EJL, X.W., BEM and TJR) by the National Science Foundation Materials Research Science and Engineering Center program through the UC Irvine Center for Complex and Active Materials (DMR-2011967). Xinyi W. and P.C. acknowledge financial support from National Science Foundation (DMR-2105328, CMMI-1935371). We also would like to thank Dr. Fan Ye, Dr. Li. Xing, and Dr. Jian-guo Zheng (IMRI, UC Irvine) for TEM assistance. We acknowledge Dr. Mingde Qin and Xiao Liu (UC San Diego) for assistance in some experiments.",

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doi = "10.1016/j.actamat.2022.118602",

language = "English",

volume = "245",

journal = "Acta Materialia",

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T1 - Strong and ductile refractory high-entropy alloys with super formability

AU - Zhang, Cheng

AU - Wang, Haoren

AU - Wang, Xinyi

AU - Tang, Yuanbo T.

AU - Yu, Qin

AU - Zhu, Chaoyi

AU - Xu, Mingjie

AU - Zhao, Shiteng

AU - Kou, Rui

AU - Wang, Xin

AU - Macdonald, Benjamin E.

AU - Reed, Roger C.

AU - Vecchio, Kenneth S.

AU - Cao, Penghui

AU - Rupert, Timothy J.

AU - Lavernia, Enrique J.

N1 - Acknowledgments: C.Z., BEM and E.J.L. would like to acknowledge financial support from UCI. This research was also partially supported (EJL, X.W., BEM and TJR) by the National Science Foundation Materials Research Science and Engineering Center program through the UC Irvine Center for Complex and Active Materials (DMR-2011967). Xinyi W. and P.C. acknowledge financial support from National Science Foundation (DMR-2105328, CMMI-1935371). We also would like to thank Dr. Fan Ye, Dr. Li. Xing, and Dr. Jian-guo Zheng (IMRI, UC Irvine) for TEM assistance. We acknowledge Dr. Mingde Qin and Xiao Liu (UC San Diego) for assistance in some experiments.

PY - 2023/2/15

Y1 - 2023/2/15

N2 - Refractory high-entropy alloys (RHEAs) are considered promising candidate materials for high-temperature structural applications that currently use superalloys. However, for most of the reported RHEAs, their poor ductility and negligible cold-workability at room temperature have hindered their use. Here, we report a new class of non-equiatomic NbTaTi-based RHEAs that can be cold-rolled to a reduction of over 90% from the as-cast state without surface treatment and/or intermediate annealing. This excellent cold-workability is facilitated by activation of a high-density of dislocations and deformation twins as well as by high diffusivity paths, such that these RHEAs can be rendered homogeneous at lower annealing temperatures for much shorter time durations. In addition, we report that the RHEAs retain their high strength at elevated temperatures and exhibit considerable ductility at cryogenic conditions, evading the traditional strength–ductility trade-off. This class of super-formable RHEAs provides a novel design pathway to fabricate high-temperature structural materials via an energy- and time-saving method.

AB - Refractory high-entropy alloys (RHEAs) are considered promising candidate materials for high-temperature structural applications that currently use superalloys. However, for most of the reported RHEAs, their poor ductility and negligible cold-workability at room temperature have hindered their use. Here, we report a new class of non-equiatomic NbTaTi-based RHEAs that can be cold-rolled to a reduction of over 90% from the as-cast state without surface treatment and/or intermediate annealing. This excellent cold-workability is facilitated by activation of a high-density of dislocations and deformation twins as well as by high diffusivity paths, such that these RHEAs can be rendered homogeneous at lower annealing temperatures for much shorter time durations. In addition, we report that the RHEAs retain their high strength at elevated temperatures and exhibit considerable ductility at cryogenic conditions, evading the traditional strength–ductility trade-off. This class of super-formable RHEAs provides a novel design pathway to fabricate high-temperature structural materials via an energy- and time-saving method.

KW - Refractory high-entropy alloys

KW - Formability

KW - Cryogenic-to-elevated temperatures

KW - Strength-ductility synergy

U2 - 10.1016/j.actamat.2022.118602

DO - 10.1016/j.actamat.2022.118602

M3 - Article

SN - 1359-6454

VL - 245

JO - Acta Materialia

JF - Acta Materialia

M1 - 118602

ER -

Strong and ductile refractory high-entropy alloys with super formability

Abstract

Bibliographical note

Keywords

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