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Effects of Al content on microstructures and high-temperature tensile properties of two newly designed CoNi-base superalloys
Wen, Mingyue1,2; Sun, Yuan1; Yu, Jinjiang1; Yang, Yanhong1; Zhou, Yizhou1; Sun, Xiaofeng1
Corresponding AuthorSun, Yuan(yuansun@imr.ac.cn) ; Yu, Jinjiang(jjyu@imr.ac.cn)
2020-09-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume835Pages:8
AbstractCoNi-base superalloys have recently attracted intensive research interests due to their wider gamma/gamma' domains and higher gamma' solvus temperatures compared to Ni-free Co-base superalloys. In this work, two CoNi-base superalloys with Al content of 9 at.% or 13 at.% were designed with the aid of CALPHAD approach. The 9Al alloy exhibits a gamma/gamma' dual-phase microstructure in its as-solidified and aged states, but the beta-(Co,Ni)Al phase precipitates on the grain boundaries in the 13Al alloy. The measured T gamma'-solvus of the as-solidified 9Al and 13Al is 1238 degrees C and 1220 degrees C, respectively, and the fraction of gamma' in the aged 9Al and 13Al is 64% and 80%, respectively. Tension tests at 900 degrees C reveal that the Al content plays a vital role on high-temperature tensile properties of the current CoNi-base superalloys. The lower yield strength but a larger tensile strain of the aged 13Al alloy, as compared with the aged 9Al alloy, are attributed to irregular shape of the softer gamma' precipitates and the easy formation of the local tiny cracks around the beta particles. This implies that the existence of beta particles can effectively relieve the grain-boundary brittleness of superalloys at high temperature. (C) 2020 Elsevier B.V. All rights reserved.
KeywordHigh-temperature alloys CoNi-base superalloys gamma/gamma ' microstructure High-temperature tension beta precipitates
Funding OrganizationNational Natural Science Foundation of China ; Aeronautics Power Foundation of China
DOI10.1016/j.jallcom.2020.155337
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51771191] ; National Natural Science Foundation of China[51801206] ; National Natural Science Foundation of China[51971214] ; Aeronautics Power Foundation of China[DLJJ1825]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000546685800063
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/321006/139584
Collection中国科学院金属研究所
Corresponding AuthorSun, Yuan; Yu, Jinjiang
Affiliation1.Chinese Acad Sci, Inst Met Res, Superalloy Div, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Wen, Mingyue,Sun, Yuan,Yu, Jinjiang,et al. Effects of Al content on microstructures and high-temperature tensile properties of two newly designed CoNi-base superalloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,835:8.
APA Wen, Mingyue,Sun, Yuan,Yu, Jinjiang,Yang, Yanhong,Zhou, Yizhou,&Sun, Xiaofeng.(2020).Effects of Al content on microstructures and high-temperature tensile properties of two newly designed CoNi-base superalloys.JOURNAL OF ALLOYS AND COMPOUNDS,835,8.
MLA Wen, Mingyue,et al."Effects of Al content on microstructures and high-temperature tensile properties of two newly designed CoNi-base superalloys".JOURNAL OF ALLOYS AND COMPOUNDS 835(2020):8.
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