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

doi:10.1016/j.jallcom.2020.155337

CORC > 金属研究所 > 中国科学院金属研究所

	Effects of Al content on microstructures and high-temperature tensile properties of two newly designed CoNi-base superalloys
	Wen, Mingyue 1,2; Sun, Yuan 1; Yu, Jinjiang 1; Yang, Yanhong 1; Zhou, Yizhou 1; Sun, Xiaofeng 1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2020-09-15
卷号	835 页码:8
关键词	High-temperature alloys CoNi-base superalloys gamma/gamma ' microstructure High-temperature tension beta precipitates
ISSN号	0925-8388
DOI	10.1016/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
内容类型	期刊论文
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.