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Effect of Pt-Al bond-coat on the tensile deformation and fracture behaviors of a second-generation SX Ni-based superalloy at elevated temperatures
Tao, X. P.1,2; Wang, X. G.1; Zhou, Y. Z.1; Tan, K. J.1,2; Liang, J. J.1; Yang, Y. H.1; Liu, J. L.1; Liu, J. D.1; Li, J. G.1; Sun, X. F.1
Corresponding AuthorWang, X. G.(xgwang11b@imr.ac.cn) ; Zhou, Y. Z.(yzzhou@imr.ac.cn)
2020-05-15
Source PublicationSURFACE & COATINGS TECHNOLOGY
ISSN0257-8972
Volume389Pages:11
AbstractAn investigation was conducted into the influence of applying Pt-Al bond-coat on the tensile deformation and fracture behavior of second-generation single crystal superalloy substrate with the temperature ranging between room temperature RT and 1100 degrees C. In the meantime, the development of a two-layer Pt-Al bond-coat, consisting of an outer layer of single-phase beta-(Ni,Pt)Al and an inter-diffusion zone of refractory metal precipitates, has also been discussed. As revealed by the results, the application of Pt-Al bond-coat contributed to a noticeable deterioration in both yield strength and ultimate tensile strength of the superalloy substrate at elevated temperatures. Nevertheless, the elongation of coated superalloy was shown to be 17.2% (at RT) and 10.4% (at 750 degrees C) lower and 9.6% (at 1100 degrees C) higher compared to uncoated samples. Following tensile test, the TEM analyses indicated that there were onsets of various slip systems, the traditional superlattice stacking faults were retarded at intermediate temperature and the dislocation debris could be increased to develop dislocation networks at higher temperature in the region of superalloy near the bond-coat. As the temperature was on the rise, the fracture mechanism of coated superalloy shifted from tearing ridges and dimples to quasi-cleavage and then to micro-void coalescence. While that of Pt-Al bond-coat was transformed from brittle to ductile rupture. Within the temperature range from RT up to 750 degrees C, a combination of long crack lengths and greater crack penetration depths into bond-coat caused more deterioration in the tensile properties of superalloy. When the temperature rose above 750 degrees C, the application of Pt-Al bond-coat improved the ductility of the substrate, as a result of the ductile failure in the bond-coat which hindered the development of through-thickness cracks.
KeywordPt-Al bond-coat Tensile deformation Fracture behaviors Ni-based superalloy Elevated temperatures
Funding OrganizationNational Science and Technology Major Project ; National Key Research and Development Program of China ; National Natural Science Foundation of China (NSFC) ; State Key Lab of Advanced Metals and Materials Open Fund ; Youth Innovation Promotion Association, Chinese Academy of Sciences
DOI10.1016/j.surfcoat.2020.125640
Indexed BySCI
Language英语
Funding ProjectNational Science and Technology Major Project[2017-VI-0002-0072] ; National Key Research and Development Program of China[2017YFA0700704] ; National Natural Science Foundation of China (NSFC)[51601192] ; National Natural Science Foundation of China (NSFC)[51671188] ; State Key Lab of Advanced Metals and Materials Open Fund[2018Z07] ; Youth Innovation Promotion Association, Chinese Academy of Sciences
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Coatings & Films ; Physics, Applied
WOS IDWOS:000528194000025
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/138635
Collection中国科学院金属研究所
Corresponding AuthorWang, X. G.; Zhou, Y. Z.
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
Recommended Citation
GB/T 7714
Tao, X. P.,Wang, X. G.,Zhou, Y. Z.,et al. Effect of Pt-Al bond-coat on the tensile deformation and fracture behaviors of a second-generation SX Ni-based superalloy at elevated temperatures[J]. SURFACE & COATINGS TECHNOLOGY,2020,389:11.
APA Tao, X. P..,Wang, X. G..,Zhou, Y. Z..,Tan, K. J..,Liang, J. J..,...&Sun, X. F..(2020).Effect of Pt-Al bond-coat on the tensile deformation and fracture behaviors of a second-generation SX Ni-based superalloy at elevated temperatures.SURFACE & COATINGS TECHNOLOGY,389,11.
MLA Tao, X. P.,et al."Effect of Pt-Al bond-coat on the tensile deformation and fracture behaviors of a second-generation SX Ni-based superalloy at elevated temperatures".SURFACE & COATINGS TECHNOLOGY 389(2020):11.
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