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A new refractory Ni7Nb2 phase identified in Laves eutectic regions by TEM study
Ge, Hualong1,2; Xing, Weiwei3; Chen, Bo3; Hu, Xiaobing4; Zheng, Shijian1,5; Liu, Kui3; Ma, Xiuliang1
Corresponding AuthorZheng, Shijian(sjzheng@hebut.edu.cn)
2021-08-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume214Pages:10
AbstractThe dissolution behavior of gamma/Laves eutectic within a typical Ni-based superalloy (Inconel 718) was investigated by in-situ and conventional transmission electron microscopy (TEM) techniques. The results show that the Laves phase dissolved firstly at 700 degrees C, but a new Ni7Nb2 phase possessing similar composition with delta-Ni3Nb phase precipitated near Laves phase did not dissolve at temperatures up to 950 degrees C. The new Ni7Nb2 phase with lattice parameters: a=0.473 nm, b=0.794 nm, c=1.21 nm and beta=91.3 degrees, shows a C2/m space group symmetry. The crystal structure of the new Ni7Nb2 phase can be understood by "triple layers" as the Ni7Zr2-type structure does, stacking perpendicular to the (001) planes. Instead of stacking with one single shift vector s corresponding to the Ni7Zr2-type structure, the stacking sequences of the new Ni7Nb2 can be characterized by alternate occurrence of +s and -s. Moreover, the structural change of gamma/Laves eutectic constituent before and after heat treatment was investigated. The Ni7Nb2 could remain after heat treatment. Since the experimental Ni7Nb2 structure was shown to be unstable in the Ni-Nb binary system by calculation, it is suggested that Zr, Si and Co promote the formation of Ni7Nb2 phase in superalloys according to the segregation behaviors of elements. Moreover, as Ni7Zr2 is considered to be detrimental to the mechanical properties, Ni7Nb2 phase should also have negative influences and should be eliminated through possible approaches. The finding of the new phase should shed light on the microstructural controlling and heat treatment process formulating of superalloys. (C) 2021 Acta MaterialiaInc. Published by Elsevier Ltd. All rights reserved.
KeywordNickel-based superalloys Inconel 718 In-situ transmission electron microscopy Laves phase Eutectic Ni-Nb phase
Funding OrganizationNational Natural Science Foundation of China ; Key Project of Natural ScienceFoundation of Liaoning Province, China
DOI10.1016/j.actamat.2021.116985
Indexed BySCI
Languageen
Funding ProjectNational Natural Science Foundation of China[51771201] ; Key Project of Natural ScienceFoundation of Liaoning Province, China[20180510059]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000670363500010
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159933
Collection中国科学院金属研究所
Corresponding AuthorZheng, Shijian
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
3.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
4.Northwestern Univ Evanston, Dept Mat Sci & Engn, Evanston, IL 60208 USA
5.Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin Key Lab Mat Laminating Fabricat & Interfa, Tianjin 300130, Peoples R China
Recommended Citation
GB/T 7714
Ge, Hualong,Xing, Weiwei,Chen, Bo,et al. A new refractory Ni7Nb2 phase identified in Laves eutectic regions by TEM study[J]. ACTA MATERIALIA,2021,214:10.
APA Ge, Hualong.,Xing, Weiwei.,Chen, Bo.,Hu, Xiaobing.,Zheng, Shijian.,...&Ma, Xiuliang.(2021).A new refractory Ni7Nb2 phase identified in Laves eutectic regions by TEM study.ACTA MATERIALIA,214,10.
MLA Ge, Hualong,et al."A new refractory Ni7Nb2 phase identified in Laves eutectic regions by TEM study".ACTA MATERIALIA 214(2021):10.
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