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Microstructural evolution of the interface between NiCrAlY coating and superalloy during isothermal oxidation
Liu, Y. Z.; Hu, X. B.; Zheng, S. J.; Zhu, Y. L.; Wei, H.; Ma, X. L.; sjzheng@imr.ac.cn; xlma@imr.ac.cn
2015
Source PublicationMATERIALS & DESIGN
ISSN0261-3069
Volume80Pages:63-69
AbstractNiCrAlY coating was plasma-sprayed on a Ni-based single crystal superalloy and then subjected to isothermal oxidation at 1100 degrees C in air up to 50 h. Using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), we investigate interfacial microstructure evolution of the coating induced by internal oxidation and nitridation. After 5 h oxidation, alpha-Al2O3 and Cr2O3 sub-layers form at the coating/substrate interface. Interestingly, after 10 h oxidation, pure Al phase is found at the coating/substrate interface owing to decomposition of substrate phase gamma'-Ni3Al. Although, after 25 h oxidation, hexagonal AlN and cubic TiN form in the substrate close to the coating/substrate interface, after 50 h oxidation, AlN transforms into alpha-Al2O3 owing to internal oxidation while TiN remains in the substrate because of its high stability. The findings of this work provide solid experimental evidence of microstructural evolution at the coating/substrate interface, especially demonstrate the conjecture that pure metal phases and nitrides could precipitate at coating/substrate interface after high temperature oxidation. (C) 2015 Elsevier Ltd. All rights reserved.
description.department[liu, y. z.] univ sci & technol china, sch chem & mat sci, hefei 230026, peoples r china ; [liu, y. z. ; hu, x. b. ; zheng, s. j. ; zhu, y. l. ; ma, x. l.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [wei, h.] chinese acad sci, superalloys div, inst met res, shenyang 110016, peoples r china
KeywordCoating Superalloy Isothermal Oxidation Interface Transmission Electron Microscopy (Tem)
Funding OrganizationMajor State Basic Research Development Program (973 Program) of China [2010CB631206]; "Hundred Talents Project" of Chinese Academy of Sciences; National Natural Science Foundation of China (NSFC) [50931004, 51071164, 51371173, 50671102]
Indexed Bysci
Language英语
WOS IDWOS:000355120300008
Citation statistics
Cited Times:42[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/74970
Collection中国科学院金属研究所
Corresponding Authorsjzheng@imr.ac.cn; xlma@imr.ac.cn
Recommended Citation
GB/T 7714
Liu, Y. Z.,Hu, X. B.,Zheng, S. J.,et al. Microstructural evolution of the interface between NiCrAlY coating and superalloy during isothermal oxidation[J]. MATERIALS & DESIGN,2015,80:63-69.
APA Liu, Y. Z..,Hu, X. B..,Zheng, S. J..,Zhu, Y. L..,Wei, H..,...&xlma@imr.ac.cn.(2015).Microstructural evolution of the interface between NiCrAlY coating and superalloy during isothermal oxidation.MATERIALS & DESIGN,80,63-69.
MLA Liu, Y. Z.,et al."Microstructural evolution of the interface between NiCrAlY coating and superalloy during isothermal oxidation".MATERIALS & DESIGN 80(2015):63-69.
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