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Microstructural evolution mechanisms and cryogenic mechanical properties of induction-melted CoNiCr2 eutectic medium entropy alloy

文献类型：期刊论文

作者Wu, Haibin4; Wang, Weili4; Liu TW(刘天威)3; Yan, Pengxu4; Ren, Wei2,4; Chen, Jian1
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2025-09-01
卷号940页码:12
关键词Eutectoid transformation Eutectic medium-entropy alloy Liquid nitrogen temperature Compressive/tensile mechanical property
ISSN号0921-5093
DOI10.1016/j.msea.2025.148578
通讯作者Wang, Weili(wlwang@nwpu.edu.cn) ; Ren, Wei(renwei@xupt.edu.cn)
英文摘要The tensile mechanical properties of eutectic multi-principal element alloys consisting of solid solution phases and intermetallic compounds are usually unsatisfactory due to their brittleness, let alone the mechanical properties at cryogenic temperatures. In this work, a novel CoNiCr2 lamellar eutectic medium entropy alloy, mainly composed of FCC-(Co,Ni) and a-Co2Cr3 phases, was prepared by vacuum induction melting. The a phase originated from the eutectoid transformation of the BCC-(Cr) phase at the low cooling rate of 28 K/min. In contrast, no a phase was observed in the arc-remelted alloy, since the rapid cooling rate over 1.67 x 104 K/min restrained the eutectoid decomposition. The compressive and tensile mechanical properties at liquid nitrogen temperature (LNT) were systematically investigated. A remarkable compressive yield strength and ductility synergy of 924 MPa and 21.8 % was obtained at LNT compared to room temperature (RT) values of 313 MPa and 37.1 %. The (Co,Ni)-a interfacial strengthening and enhanced lattice friction stress were responsible for the improved compressive yield strength, while the more brittle a phase slightly reduced ductility. Moreover, the deformation mechanisms were dominated by Lomer-Cottrell locks at RT, along with stacking faults and nanoscale deformation twins at LNT. This work may provide new insights for designing eutectic high/medium entropy alloys with superior mechanical properties for cryogenic applications.
分类号一类
WOS关键词STRENGTH ; DUCTILITY ; DEFORMATION ; BEHAVIOR ; PHASE
资助项目National Natural Science Foundation of China[U24A20106] ; National Natural Science Foundation of China[52171048] ; National Natural Science Foundation of China[51931005] ; National Natural Science Foundation of China[U24A2034] ; Key Research and Development Program of Shaanxi Province[No.2020ZDLGY12-02]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001501332000001
资助机构National Natural Science Foundation of China ; Key Research and Development Program of Shaanxi Province
其他责任者Wang, Weili，Ren, Wei
源URL[http://dspace.imech.ac.cn/handle/311007/101718]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Xian Technol Univ, Sch Mat Sci & Chem Engn, Xian 710021, Peoples R China
2.Xian Univ Posts & Telecommun, Sch Sci, Xian 710121, Peoples R China;
3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
4.Northwestern Polytech Univ, Sch Phys Sci & Technol, Xian 710072, Peoples R China;
推荐引用方式
GB/T 7714		 Wu, Haibin,Wang, Weili,Liu TW,et al. Microstructural evolution mechanisms and cryogenic mechanical properties of induction-melted CoNiCr2 eutectic medium entropy alloy[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2025,940:12.
APA Wu, Haibin,Wang, Weili,刘天威,Yan, Pengxu,Ren, Wei,&Chen, Jian.(2025).Microstructural evolution mechanisms and cryogenic mechanical properties of induction-melted CoNiCr2 eutectic medium entropy alloy.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,940,12.
MLA Wu, Haibin,et al."Microstructural evolution mechanisms and cryogenic mechanical properties of induction-melted CoNiCr2 eutectic medium entropy alloy".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 940(2025):12.

入库方式： OAI收割

来源：力学研究所

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