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Effects of Al content on microstructures and high-temperature tensile properties of two newly designed CoNi-base superalloys

文献类型：期刊论文

作者Wen, Mingyue1,2; Sun, Yuan1; Yu, Jinjiang1; Yang, Yanhong1; Zhou, Yizhou1; Sun, Xiaofeng1
刊名JOURNAL OF ALLOYS AND COMPOUNDS
出版日期2020-09-15
卷号835页码:8
ISSN号0925-8388
关键词High-temperature alloys CoNi-base superalloys gamma/gamma ' microstructure High-temperature tension beta precipitates
DOI10.1016/j.jallcom.2020.155337
通讯作者Sun, Yuan(yuansun@imr.ac.cn) ; Yu, Jinjiang(jjyu@imr.ac.cn)
英文摘要CoNi-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.
资助项目National 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研究方向Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
出版者ELSEVIER SCIENCE SA
WOS记录号WOS:000546685800063
资助机构National Natural Science Foundation of China ; Aeronautics Power Foundation of China
源URL[http://ir.imr.ac.cn/handle/321006/139581]  
专题金属研究所_中国科学院金属研究所
通讯作者Sun, Yuan; Yu, Jinjiang
作者单位1.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
推荐引用方式
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.

入库方式： OAI收割

来源：金属研究所

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