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Mechanical and microstructural properties of a CoCrFe0.75NiMo0.3Nb0.125 high-entropy alloy additively manufactured via cold-spray
Rojas, David Funes1; Li, Haoyang2; Orhan, Okan K.1; Shao, Chenwei3; Hogan, James D.2; Ponga, Mauricio1
Corresponding AuthorHogan, James D.(jdhogan@ualberta.ca) ; Ponga, Mauricio(mponga@mech.ubc.ca)
2022-02-10
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume893Pages:12
AbstractWe present a combined experimental and computational investigation of the mechanical properties of a CoCrFe0.75NiMo0.3Nb0.125 (composition in molar ratio) high-entropy alloy additively manufactured via cold spray. We find that the sprayed alloy exhibits extraordinary mechanical properties under compression, reaching yield stress of similar to 1745 MPa, ultimate stress of similar to 2622 MPa, and a maximum strain at failure of similar to 9%. These exceptional mechanical properties are the result of four independent hardening mechanisms. First, using ab initio simulations, we find that non-equiatomic compositions increase the enthalpy of mixing, promoting better solubility of solute Mo and Nb atoms while simultaneously preserving the electronegativity of the base alloy. The higher solubility results in solid-solution hardening and nanosized precipitate formation, promoting additional hardening. These effects are confirmed in the experimental characterization of the manufactured HEA, where nanosized precipitates of similar to 226 +/- 65 nm in size are identified. Additional hardening effects are associated with the manufacturing process, where the high velocity impacts of the microparticles promote dynamic recrystallization through dislocation emission and grain refinement. To understand the dynamic recrystallization of particles, high-velocity impact simulations using molecular dynamics are performed. We find that when particles reach a critical impact velocity (similar to 600-800 m. s(-1)), the dislocation density reaches a maximum, and grain refinement is maximized. The decaying wave pressures developed during the impact generate gradual refinement levels, leading to heterogeneous microstructures combining nano and micro grains, which was later confirmed experimentally using electron backscatter diffraction. These subtle atomic and microstructural features result in outstanding experimentally evaluated yield and ultimate stresses compared to other high-entropy alloys with similar compositions. (C) 2021 Elsevier B.V. All rights reserved.
KeywordHigh-entropy alloys CoCrFe0.75NiMo0.3Nb0.125 Cold-spray Additive manufacturing Mechanical properties
Funding OrganizationNatural Sciences and Engineering Research Council of Canada (NSERC) through the Discovery Grant ; IDEaS Program ; New Frontier in Research Fund Exploration program ; Department of Mechanical Engineering at the University of British Columbia
DOI10.1016/j.jallcom.2021.162309
Indexed BySCI
Language英语
Funding ProjectNatural Sciences and Engineering Research Council of Canada (NSERC) through the Discovery Grant[2016-06114] ; Natural Sciences and Engineering Research Council of Canada (NSERC) through the Discovery Grant[2016-04685] ; IDEaS Program[W7714-196811] ; IDEaS Program[W7714-217552] ; New Frontier in Research Fund Exploration program[NFRFE-2019-01095] ; Department of Mechanical Engineering at the University of British Columbia
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000711216700005
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/167089
Collection中国科学院金属研究所
Corresponding AuthorHogan, James D.; Ponga, Mauricio
Affiliation1.Univ British Columbia, Dept Mech Engn, 2054-6250 Appl Sci Lane, Vancouver, BC V6T 1Z4, Canada
2.Univ Alberta, Dept Mech Engn, Edmonton, AB T6G 2R3, Canada
3.Chinese Acad Sci, Inst Met Res, Lab Fatigue & Fracture Mat, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Rojas, David Funes,Li, Haoyang,Orhan, Okan K.,et al. Mechanical and microstructural properties of a CoCrFe0.75NiMo0.3Nb0.125 high-entropy alloy additively manufactured via cold-spray[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2022,893:12.
APA Rojas, David Funes,Li, Haoyang,Orhan, Okan K.,Shao, Chenwei,Hogan, James D.,&Ponga, Mauricio.(2022).Mechanical and microstructural properties of a CoCrFe0.75NiMo0.3Nb0.125 high-entropy alloy additively manufactured via cold-spray.JOURNAL OF ALLOYS AND COMPOUNDS,893,12.
MLA Rojas, David Funes,et al."Mechanical and microstructural properties of a CoCrFe0.75NiMo0.3Nb0.125 high-entropy alloy additively manufactured via cold-spray".JOURNAL OF ALLOYS AND COMPOUNDS 893(2022):12.
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