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Microstructural characterization of the M23C6 carbide in a long-term aged Ni-based superalloy
Hu, X. B.1,3; Qin, X. Z.2; Hou, J. S.2; Zhou, L. Z.2; Ma, X. L.1
Corresponding AuthorMa, X. L.(xlma@imr.ac.cn)
2017
Source PublicationPHILOSOPHICAL MAGAZINE LETTERS
ISSN0950-0839
Volume97Issue:2Pages:43-49
AbstractThe microstructural features of M23C6 carbide in a long-term aged heat- and corrosion-resistant Ni-based superalloy have been investigated in detail using various kinds of transmission electron microscope (TEM) techniques. It is found that TEM contrast, which is related to structural and chemical inhomogeneities inside the grains, always exists in the interior of grains in the alloy. The structure of these inhomogeneous regions has been determined to be the same as that of the and t-M23C6 phases, where t-M23C6 indicates a transitional and metastable phase. Although possessing the same structure as the M23C6 phase, the chemical composition of the t-M23C6 is different from that of the M23C6 phase. Compared with M23C6, t-M23C6 is richer in Ni, Co, Al and Ti but poorer in W, Mo and Cr. This phenomenon of structural and chemical inhomogeneity demonstrates that pristine M23C6 carbide (p-M23C6) precipitated in standard heat-treated samples is unstable. Therefore, upon long-term ageing treatment, Ni, Co, Al and Ti may locally enrich inside the p-M23C6 phase, finally forming the phase, which can be described by the decomposition reaction p-M23C6M23C6+.
KeywordNickel-based superalloys long-term ageing transmission electron microscopy M23C6-type carbide structural instability
Funding OrganizationNational Natural Science Foundation of China
DOI10.1080/09500839.2016.1273554
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[11327901]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000395061900001
PublisherTAYLOR & FRANCIS LTD
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/123897
Collection中国科学院金属研究所
Corresponding AuthorMa, X. L.
Affiliation1.Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang, Peoples R China
2.Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang, Peoples R China
3.Japan Fine Ceram Ctr, Nanostruct Res Lab, Nagoya, Aichi, Japan
Recommended Citation
GB/T 7714
Hu, X. B.,Qin, X. Z.,Hou, J. S.,et al. Microstructural characterization of the M23C6 carbide in a long-term aged Ni-based superalloy[J]. PHILOSOPHICAL MAGAZINE LETTERS,2017,97(2):43-49.
APA Hu, X. B.,Qin, X. Z.,Hou, J. S.,Zhou, L. Z.,&Ma, X. L..(2017).Microstructural characterization of the M23C6 carbide in a long-term aged Ni-based superalloy.PHILOSOPHICAL MAGAZINE LETTERS,97(2),43-49.
MLA Hu, X. B.,et al."Microstructural characterization of the M23C6 carbide in a long-term aged Ni-based superalloy".PHILOSOPHICAL MAGAZINE LETTERS 97.2(2017):43-49.
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