Tailoring nanoprecipitates to achieve ultrahigh strength (CoCrNi)94.5W3Ta2.5 medium-entropy alloys

doi:10.1016/j.msea.2023.146046

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Tailoring nanoprecipitates to achieve ultrahigh strength (CoCrNi)94.5W3Ta2.5 medium-entropy alloys
	Chen, Jin-Xi ; Li, Tong ; Tan, Yuan-Yuan 3; Chen, Yan 3; Wang, Hai-Ying 3; Dai, Lan-Hong 1,2,3
刊名	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
	2024-02-01
卷号	892 页码:13
关键词	Dual nanoprecipitates Medium-entropy alloys Mechanical properties Precipitation hardening
ISSN号	0921-5093
DOI	10.1016/j.msea.2023.146046
通讯作者	Chen, Yan(chenyan@lnm.imech.ac.cn) ; Dai, Lan-Hong(lhdai@lnm.imech.ac.cn)
英文摘要	Metallic materials with high mechanical performance are in constant demand by various engineering applications. However, most conventional strengthening mechanisms inevitably suffer from fiercely sacrificing ductility, which severely limits service safety of metallic alloys, especially under various harsh circumstances. In this work, a novel ultra-strong (CoCrNi)94.5W3Ta2.5 medium entropy alloy (MEA) with dual nanoprecipitates is successfully developed. By conducting multiple thermomechanical processes, not only quantities of coherent gamma" nanoprecipitates with D022 superlattice are introduced, but also massive semi-coherent eta nanoprecipitates with hexagonal D024 superlattice are reconstructed with appropriate sizes and distributions, meanwhile ultrafine grains are achieved, together enabling superior strength-ductility synergies. This MEA exhibits not only high tensile strength of about 1.7 GPa and ultimate elongation of 23.8 % at room temperature, but also ultra-high tensile strength of about 2.2 GPa and still sufficient ultimate elongation of 13.2 % at cryogenic temperature. In-depth microstructure characterization indicates that the nanoprecipitates are effective barriers to dislocation motion at the early stages of plastic deformation. Intriguingly, the slip and deformation twinning could be transmitted across the phase boundaries with increasing applied strain, ensuring both strength enhancement and plasticity maintenance. At cryogenic temperature, much more complex deformation mechanisms are activated, e. g., multiple slip systems and high-density deformation twins, facilitating even better mechanical properties. The design concept of strengthening materials via tailoring dual coherent nanoprecipitates may afford a paradigm to develop advanced metallic materials with ultrahigh strength.
资助项目	NSFC[U2141204] ; NSFC[11790292] ; NSFC[11972346] ; NSFC[12102433] ; NSFC Basic Science Center Program for ''Multi-scale Problems in Nonlinear Mechanics ''[11988102] ; Key Research Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China[KFJJ21-01] ; Opening project of State Key Laboratory of Explosion Science and Technology[KFJJ18-14 M] ; Opening project of State Key Laboratory of Explosion Science and Technology[ZDRW -CN -2021-2-3] ; [2022YFC3320504-02]
WOS关键词	MECHANICAL-PROPERTIES ; TENSILE PROPERTIES ; PRECIPITATION ; DUCTILITY ; COHERENT ; DEFORMATION ; BEHAVIOR ; MICROSTRUCTURE ; PLASTICITY ; AMBIENT
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
WOS记录号	WOS:001164657600001
资助机构	NSFC ; NSFC Basic Science Center Program for ''Multi-scale Problems in Nonlinear Mechanics '' ; Key Research Program of the Chinese Academy of Sciences ; National Key Research and Development Program of China ; Opening project of State Key Laboratory of Explosion Science and Technology
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/94451]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Chen, Yan; Dai, Lan-Hong
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 101408, Peoples R China 2.State Key Lab Explos Sci & Technol, Beijing 100081, Peoples R China 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Chen, Jin-Xi,Li, Tong,Tan, Yuan-Yuan,et al. Tailoring nanoprecipitates to achieve ultrahigh strength (CoCrNi)94.5W3Ta2.5 medium-entropy alloys[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2024,892:13.
APA	Chen, Jin-Xi,Li, Tong,Tan, Yuan-Yuan,Chen, Yan,Wang, Hai-Ying,&Dai, Lan-Hong.(2024).Tailoring nanoprecipitates to achieve ultrahigh strength (CoCrNi)94.5W3Ta2.5 medium-entropy alloys.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,892,13.
MLA	Chen, Jin-Xi,et al."Tailoring nanoprecipitates to achieve ultrahigh strength (CoCrNi)94.5W3Ta2.5 medium-entropy alloys".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 892(2024):13.