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

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

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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.

Refractory high entropy alloyMulti-phase structureD022 superlatticePrecipitation strengthening

Tong Li、Jin-Xi Chen、Tian-Wei Liu、Yan Chen、Jun-Hua Luan、Zeng-Bao Jiao、Chain-Tsuan Liu、Lan-Hong Dai

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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

Inter-University 3D Atom Probe Tomography Unit,Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China

Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaKey Research Program of Frontier SciencesScience Challenge ProjectKey Research Program of the Chinese Academy of SciencesOpening Project of State Key Laboratory of Explosion Science and Technology

117902921197234612102433U214120411988102XDB22040302XDB22040303QYZDJSSW-JSCO11TZ2016001ZDRW-CN-2021-2-3KFJJ21-01Z

2024

10.1016/j.jmst.2023.07.069

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)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.177(10)
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