材料科学技术(英文版)2024，Vol.177Issue(10) ：85-95.DOI:10.1016/j.jmst.2023.07.069

D022 precipitates strengthened W-Ta-Fe-Ni refractory high-entropy alloy

Tong Li Jin-Xi Chen Tian-Wei Liu Yan Chen Jun-Hua Luan Zeng-Bao Jiao Chain-Tsuan Liu Lan-Hong Dai
材料科学技术(英文版)2024，Vol.177Issue(10) ：85-95.DOI:10.1016/j.jmst.2023.07.069
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D022 precipitates strengthened W-Ta-Fe-Ni refractory high-entropy alloy

Tong Li 1Jin-Xi Chen 1Tian-Wei Liu 1Yan Chen 1Jun-Hua Luan 2Zeng-Bao Jiao 3Chain-Tsuan Liu 2Lan-Hong Dai1
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作者信息

  • 1. State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 101408,China
  • 2. Inter-University 3D Atom Probe Tomography Unit,Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China
  • 3. Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong,China
  • 折叠

Abstract

Refractory high-entropy alloys have recently emerged as promising candidates for high-temperature structural applications.However,their performance is compromised by the trade-off required between strength and ductility.Here,a novel W30Ta5(FeNi)65 refractory high-entropy alloy with an outstanding combination of strength and plasticity at both room and elevated temperatures is designed,based on the multi-phase transitions design strategy.The alloy comprises a body-centered cubic dendrite phase,a topologically close-packed μ rhombohedral phase,and a high-density coherent nano-precipitate γ"phase with the D022structure(Ni3Ta type)embedded in a continuous face-centered cubic matrix.Owing to pre-cipitation strengthening of D022,the yield stress of the alloy is determined as high as 1450 MPa,which is a significant improvement(～100％)in comparison with the D022-free alloy,without a loss of ductil-ity.This alloy exhibits an excellent high-temperature strength,with the yield strengths of 1300 MPa at 600 ℃ and 320 MPa at 1000 ℃.Detailed microstructural characterization using transmission electron mi-croscopy,high-angle annular dark-field imaging,and three-dimensional atom probe tomography analyses indicated that this superior strength-plasticity combination stems from the synergy of a multiple-phase structure.These results provide a new insight into the design of RHEAs and other advanced alloys.

Key words

Refractory high entropy alloy/Multi-phase structure/D022 superlattice/Precipitation strengthening

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基金项目

National Natural Science Foundation of China(11790292)

National Natural Science Foundation of China(11972346)

National Natural Science Foundation of China(12102433)

National Natural Science Foundation of China(U2141204)

National Natural Science Foundation of China(11988102)

National Key Research and Development Program of China(XDB22040302)

National Key Research and Development Program of China(XDB22040303)

Key Research Program of Frontier Sciences(QYZDJSSW-JSCO11)

Science Challenge Project(TZ2016001)

Key Research Program of the Chinese Academy of Sciences(ZDRW-CN-2021-2-3)

Opening Project of State Key Laboratory of Explosion Science and Technology(KFJJ21-01Z)

出版年

2024
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD
影响因子：0.657
ISSN：1005-0302
参考文献量74
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