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A correlative multidimensional study of gamma ' precipitates with Ta addition in Re-containing Ni-based single crystal superalloys
Zhang, Jiachen1; Huang, Taiwen1; Cao, Kaili1; Chen, Jia1; Zong, Huajing1; Wang, Dong2; Zhang, Jian2; Zhang, Jun1; Liu, Lin1
Corresponding AuthorLiu, Lin(linliu@nwpu.edu.cn)
2021-06-10
Source PublicationJOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
ISSN1005-0302
Volume75Pages:68-77
AbstractThe microstructural evolution in Re-containing Ni-based single crystal superalloys with different Tantalum (Ta) content (2Ta, 5Ta and 8Ta in wt %) was investigated. Ta addition significantly affected the gamma' precipitate morphology, gamma/gamma' lattice misfit and microstructural stability during long-term aging. Results showed that the partitioning behaviors of solutes were enhanced by Ta addition, meanwhile, the reversal partitioning behavior of W was triggered which partitioned from gamma' precipitate to gamma matrix. The elemental concentration redistribution caused variations in lattice misfit from positive to negative, the values of lattice misfit were measured to be 0.16 % for 2Ta alloy, then decreased to -0.07 % for 5Ta alloy and negatively increased to -0.23 % for 8Ta alloy. These variations in the lattice misfit were reflected on the transition of gamma' morphology from round-cornered cuboidal shape to cuboidal with sharp corners, accomplished with increasing shape parameter ratio eta. Consequently, the optimal gamma' shape could be obtained at lattice misfit of approximately 0.3 %. The gamma' coarsening investigation at 900 degrees C (up to 2000 h) indicated that Ta addition was beneficial for improving the microstructural stability by reducing the coarsening rate and interfacial energy, accompanied by the enhanced capability of resisting gamma' coalescence. By incorporating the calculated interfacial energy, computational modeling, Thermo-Calc and PrecipiCalc, were employed to elucidate the gamma' kinetic pathways, the simulation results agreed with experiments, indicating that the model and parameters were reasonable. Additionally, it was found that there was no overlap between gamma' nucleation and coarsening when the gamma/gamma' interfacial energy increased to a critical value. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
KeywordTantalum Ni-based superalloys Atom probe tomography Lattice misfit Coarsening kinetics
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China ; Natural Science Foundation of Shaanxi Province
DOI10.1016/j.jmst.2020.10.025
Indexed BySCI
Languageen
Funding ProjectNational Natural Science Foundation of China[51631008] ; National Key Research and Development Program of China[2016YFB0701400] ; Natural Science Foundation of Shaanxi Province[2020JM122]
WOS Research AreaMaterials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000640021600008
PublisherJOURNAL MATER SCI TECHNOL
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/162319
Collection中国科学院金属研究所
Corresponding AuthorLiu, Lin
Affiliation1.Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
2.Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Jiachen,Huang, Taiwen,Cao, Kaili,et al. A correlative multidimensional study of gamma ' precipitates with Ta addition in Re-containing Ni-based single crystal superalloys[J]. JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,2021,75:68-77.
APA Zhang, Jiachen.,Huang, Taiwen.,Cao, Kaili.,Chen, Jia.,Zong, Huajing.,...&Liu, Lin.(2021).A correlative multidimensional study of gamma ' precipitates with Ta addition in Re-containing Ni-based single crystal superalloys.JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY,75,68-77.
MLA Zhang, Jiachen,et al."A correlative multidimensional study of gamma ' precipitates with Ta addition in Re-containing Ni-based single crystal superalloys".JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 75(2021):68-77.
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