Mechanical and microstructural properties of a CoCrFe0.75NiMo0.3Nb0.125 high-entropy alloy additively manufactured via cold-spray

doi:10.1016/j.jallcom.2021.162309

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	Mechanical and microstructural properties of a CoCrFe0.75NiMo0.3Nb0.125 high-entropy alloy additively manufactured via cold-spray
	Rojas, David Funes 1; Li, Haoyang 2; Orhan, Okan K.1; Shao, Chenwei 3; Hogan, James D.2; Ponga, Mauricio 1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2022-02-10
卷号	893 页码:12
关键词	High-entropy alloys CoCrFe0.75NiMo0.3Nb0.125 Cold-spray Additive manufacturing Mechanical properties
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2021.162309
通讯作者	Hogan, James D.(jdhogan@ualberta.ca) ; Ponga, Mauricio(mponga@mech.ubc.ca)
英文摘要	We 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.
资助项目	Natural 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研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000711216700005
资助机构	Natural 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
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/167088]
专题	金属研究所_中国科学院金属研究所
通讯作者	Hogan, James D.; Ponga, Mauricio
作者单位	1.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
推荐引用方式 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.