D0_(22) precipitates strengthened W-Ta-Fe-Ni refractory high-entropy alloy  

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

机构地区:[1]State Key Laboratory of Nonlinear Mechanics,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Engineering Science,University of Chinese Academy of Sciences,Beijing 101408,China [3]Inter-University 3D Atom Probe Tomography Unit,Department of Materials Science and Engineering,City University of Hong Kong,Hong Kong,China [4]Department of Mechanical Engineering,The Hong Kong Polytechnic University,Hong Kong,China

出  处:《Journal of Materials Science & Technology》2024年第10期85-95,共11页材料科学技术(英文版)

基  金:National Natural Science Foundation of China(Nos.11790292,11972346,12102433,U2141204 and 11988102);National Key Research and Development Program of China(No.2017YFB0702003);Strategic Priority Research Program(Nos.XDB22040302 and XDB22040303);Key Research Program of Frontier Sciences(No.QYZDJSSW-JSC011);Science Challenge Project(No.TZ2016001);Key Research Program of the Chinese Academy of Sciences(No.ZDRW-CN-2021-2-3);Opening Project of State Key Laboratory of Explosion Science and Technology(No.KFJJ21-01Z).

摘  要: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 D0_(22)structure(Ni3Ta type)embedded in a continuous face-centered cubic matrix.Owing to pre-cipitation strengthening of D0_(22),the yield stress of the alloy is determined as high as 1450 MPa,which is a significant improvement(~100%)in comparison with the D0_(22)-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.

关 键 词:Refractory high entropy alloy Multi-phase structure D0_(22)superlattice Precipitation strengthening 

分 类 号:TG139[一般工业技术—材料科学与工程]

 

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