Strong work-hardenable body-centered-cubic high-entropy alloys at cryogenic temperature

Xiaocan Wen; Li Zhu; Muhammad Naeem; Hailong Huang; Suihe Jiang; Hui Wang; Xiongjun Liu; Xiaobin Zhang; Xun-Li Wang; Yuan Wu; Zhaoping Lu

doi:10.1016/j.scriptamat.2023.115434

Strong work-hardenable body-centered-cubic high-entropy alloys at cryogenic temperature

Xiaocan Wen, Li Zhu, Muhammad Naeem, Hailong Huang, Suihe Jiang, Hui Wang, Xiongjun Liu, Xiaobin Zhang, Xun-Li Wang, Yuan Wu^*, Zhaoping Lu^*

^*Corresponding author for this work

Department of Physics

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

37 Citations (Scopus)

Abstract

Body-centered cubic (BCC) metals and alloys are usually brittle with limited strain hardening capability at cryogenic temperatures due to the restricted dislocation nucleation and mobility. Herein, we report that decrease of the Nb content in the TiZrHfNbTa0.2 high-entropy alloys (HEAs) can facilitate multiple deformation mechanisms, i.e., dislocation planar slip, strain-induced phase transformations and twinning, at the cryogenic temperature of 77 K due to the decreased phase stability. Particularly, the TiZrHfNb0.3Ta0.2 HEA showed pronounced strain hardening capability and exceptionally high uniform elongation of about 25% with no sign of ductile-brittle transition. Our findings are important not only for providing a prominent family of metallic materials for application at the extreme service conditions, but also for understanding the deformation mechanism of HEAs at cryogenic temperatures in general. © 2023 Acta Materialia Inc.

Original language	English
Article number	115434
Journal	Scripta Materialia
Volume	231
Online published	27 Mar 2023
DOIs	https://doi.org/10.1016/j.scriptamat.2023.115434
Publication status	Published - 1 Jul 2023

Funding

This research was supported by the National Natural Science Foundation of China (Nos. 51871016, 51671021, U20B2025), the Funds for Creative Research Groups of NSFC (51921001), Projects of International Cooperation and Exchanges of NSFC (51961160729, 52061135207), 111 Project (BP0719004), Program for Changjiang Scholars and Innovative Research Team in University of China (IRT_14R05), Dr. Yuan Wu specially appreciates the Fundamental Research Funds for the Central Universities of China (FRF-TP-22–001C2).XLW acknowledges the support by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China [Project No. CityU 11209822]. The in situ neutron diffraction experiments were conducted at the TAKUMI beamline of Japan Proton Accelerator Research Complex under Proposal Nos. 2021B0229 and 2022A0309.

Research Keywords

Deformation twinning
High entropy alloys
Mechanical properties
Phase stability
Phase transformation

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10.1016/j.scriptamat.2023.115434

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title = "Strong work-hardenable body-centered-cubic high-entropy alloys at cryogenic temperature",

abstract = "Body-centered cubic (BCC) metals and alloys are usually brittle with limited strain hardening capability at cryogenic temperatures due to the restricted dislocation nucleation and mobility. Herein, we report that decrease of the Nb content in the TiZrHfNbTa0.2 high-entropy alloys (HEAs) can facilitate multiple deformation mechanisms, i.e., dislocation planar slip, strain-induced phase transformations and twinning, at the cryogenic temperature of 77 K due to the decreased phase stability. Particularly, the TiZrHfNb0.3Ta0.2 HEA showed pronounced strain hardening capability and exceptionally high uniform elongation of about 25% with no sign of ductile-brittle transition. Our findings are important not only for providing a prominent family of metallic materials for application at the extreme service conditions, but also for understanding the deformation mechanism of HEAs at cryogenic temperatures in general. {\textcopyright} 2023 Acta Materialia Inc.",

keywords = "Deformation twinning, High entropy alloys, Mechanical properties, Phase stability, Phase transformation",

author = "Xiaocan Wen and Li Zhu and Muhammad Naeem and Hailong Huang and Suihe Jiang and Hui Wang and Xiongjun Liu and Xiaobin Zhang and Xun-Li Wang and Yuan Wu and Zhaoping Lu",

year = "2023",

month = jul,

day = "1",

doi = "10.1016/j.scriptamat.2023.115434",

language = "English",

volume = "231",

journal = "Scripta Materialia",

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TY - JOUR

T1 - Strong work-hardenable body-centered-cubic high-entropy alloys at cryogenic temperature

AU - Wen, Xiaocan

AU - Zhu, Li

AU - Naeem, Muhammad

AU - Huang, Hailong

AU - Jiang, Suihe

AU - Wang, Hui

AU - Liu, Xiongjun

AU - Zhang, Xiaobin

AU - Wang, Xun-Li

AU - Wu, Yuan

AU - Lu, Zhaoping

PY - 2023/7/1

Y1 - 2023/7/1

N2 - Body-centered cubic (BCC) metals and alloys are usually brittle with limited strain hardening capability at cryogenic temperatures due to the restricted dislocation nucleation and mobility. Herein, we report that decrease of the Nb content in the TiZrHfNbTa0.2 high-entropy alloys (HEAs) can facilitate multiple deformation mechanisms, i.e., dislocation planar slip, strain-induced phase transformations and twinning, at the cryogenic temperature of 77 K due to the decreased phase stability. Particularly, the TiZrHfNb0.3Ta0.2 HEA showed pronounced strain hardening capability and exceptionally high uniform elongation of about 25% with no sign of ductile-brittle transition. Our findings are important not only for providing a prominent family of metallic materials for application at the extreme service conditions, but also for understanding the deformation mechanism of HEAs at cryogenic temperatures in general. © 2023 Acta Materialia Inc.

AB - Body-centered cubic (BCC) metals and alloys are usually brittle with limited strain hardening capability at cryogenic temperatures due to the restricted dislocation nucleation and mobility. Herein, we report that decrease of the Nb content in the TiZrHfNbTa0.2 high-entropy alloys (HEAs) can facilitate multiple deformation mechanisms, i.e., dislocation planar slip, strain-induced phase transformations and twinning, at the cryogenic temperature of 77 K due to the decreased phase stability. Particularly, the TiZrHfNb0.3Ta0.2 HEA showed pronounced strain hardening capability and exceptionally high uniform elongation of about 25% with no sign of ductile-brittle transition. Our findings are important not only for providing a prominent family of metallic materials for application at the extreme service conditions, but also for understanding the deformation mechanism of HEAs at cryogenic temperatures in general. © 2023 Acta Materialia Inc.

KW - Deformation twinning

KW - High entropy alloys

KW - Mechanical properties

KW - Phase stability

KW - Phase transformation

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U2 - 10.1016/j.scriptamat.2023.115434

DO - 10.1016/j.scriptamat.2023.115434

M3 - RGC 21 - Publication in refereed journal

SN - 1359-6462

VL - 231

JO - Scripta Materialia

JF - Scripta Materialia

M1 - 115434

ER -

Strong work-hardenable body-centered-cubic high-entropy alloys at cryogenic temperature

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Research Keywords

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GRF: Suppression of Ductile-to-brittle Transition and Low-temperature Deformation Mechanisms in Bcc High-entropy Alloys - Insights from In-situ Neutron Diffraction Studies

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