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The lattice friction stress driven temperature-dependent tensile deformation behaviors of 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, Wei4,5; Zhou, Pengjie1; Chen, Jian2
刊名JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
出版日期2025-06-01
卷号219页码:44-58
关键词Eutectic medium-entropy alloy Microstructures Nanoparticles Mechanical properties Stacking faults
ISSN号1005-0302
DOI10.1016/j.jmst.2024.09.006
通讯作者Wang, Weili(wlwang@nwpu.edu.cn) ; Ren, Wei(renwei@xupt.edu.cn)
英文摘要A heterogeneous CoNiCr2 eutectic medium-entropy alloy (EMEA), comprising soft face-centered cubic (FCC) and hard body-centered cubic (BCC) lamellae, associated with minor acicular hexagonal close-packed (HCP) phase precipitated in BCC phase, was synthesized towards excellent tensile strength and ductility synergy. The tensile mechanical properties demonstrated that this alloy was temperature-dependent, i.e., when the testing temperature reduced from room temperature (RT) to liquid nitrogen temperature (LNT), the yield strength, ultimate strength, and uniform elongation were enhanced from 449 MPa, 821 MPa, and 5.0 % to 702 MPa, 1174 MPa, and 8.4 %, respectively. The prominent elevation of yield strength at LNT mainly resulted from the dramatically enhanced lattice friction stress ( a0 ) and the FCC-BCC interfacial strengthening, while the improved ductility was attributed to the superior crack-arrest capability of FCC matrix stemmed from the accumulation of stacking faults (SFs) and enhanced Q0 at LNT. Additionally, although the deformation mechanisms were dominated by planar dislocation glides and SFs at both temperatures, the initiation of premature cracks in the BCC phase due to the inferior deformation capability at LNT constrained the better strength-ductility trade-off. The cracks in the BCC phase tended to propagate along the BCC-HCP interfaces because of the strain incompatibility. Furthermore, the sub-nanoscale L12 particles in the FCC matrix could not only strengthen this alloy but also improve the stacking fault energy leading to no deformation twinning even at LNT. This work may provide a guide for the design of remarkable strength and ductility synergy EMEAs combined with outstanding castability for applications at cryogenic temperatures. (c) 2025 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
分类号一类
WOS关键词STRENGTH-DUCTILITY SYNERGY ; MECHANICAL-PROPERTIES ; DESIGN ; STRATEGY ; CRCONI
资助项目National Natural Science Foundation of China[51931005] ; National Natural Science Foundation of China[52171048] ; Key Research and Development Program of Shaanxi Province[2020ZDLGY12-02]
WOS研究方向Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:001532934500001
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/311007/102113]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Peoples R China;
2.Xian Technol Univ, Sch Mat Sci & Chem Engn, Xian 710021, 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;
5.Xian Univ Posts & Telecommun, Sch Sci, Xian 710121, Peoples R China;
推荐引用方式
GB/T 7714		 Wu, Haibin,Wang, Weili,Liu TW,et al. The lattice friction stress driven temperature-dependent tensile deformation behaviors of CoNiCr2 eutectic medium-entropy alloy[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2025,219:44-58.
APA Wu, Haibin.,Wang, Weili.,刘天威.,Yan, Pengxu.,Ren, Wei.,...&Chen, Jian.(2025).The lattice friction stress driven temperature-dependent tensile deformation behaviors of CoNiCr2 eutectic medium-entropy alloy.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,219,44-58.
MLA Wu, Haibin,et al."The lattice friction stress driven temperature-dependent tensile deformation behaviors of CoNiCr2 eutectic medium-entropy alloy".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 219(2025):44-58.

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来源：力学研究所

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