The formation of η-Ni<sub>3</sub>Ti phase microstructure in a cast nickel-based superalloy with high Ti/Al ratio

doi:10.1016/j.jmrt.2024.01.156

IMR OpenIR

	The formation of η-Ni₃Ti phase microstructure in a cast nickel-based superalloy with high Ti/Al ratio
	Hou, Kunlei; Ou, Meiqiong; Xing, Weiwei; Ma, Guangcai; Hao, Xianchao; Wang, Min; Ma, Yingche
通讯作者	Ma, Yingche(ycma@imr.ac.cn)
	2024-03-01
发表期刊	JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
ISSN	2238-7854
卷号	29 页码:764-778
摘要	By over-aging at 900 degrees C and 1000 degrees C, a high volume-fraction of eta-Ni3Ti phase was prepared in a cast nickel-based superalloy with high Ti/Al ratio. EBSD analysis shows that the eta phase obeys a SN-type orientation relationship with gamma matrix: <11 <(2)over bar> 0>(eta)//<1 <(1)over bar> 0>(gamma), {0001}(eta)//{111}(gamma). Four kinds of eta phase variants with a 70.5 degrees misorientation to each other are clarified. From the eta/gamma interface structure as detected by HRTEM, the thin plate-like morphology of eta phase is attributed to the preferential growth of the incoherent {11 (2) over bar 0}(eta)//{1 (1) over bar 0}(gamma) interface. The formation of eta phase at the grain boundary (GB) was by a discontinuous precipitation reaction, during which the original GB migrates from the eta-nucleating side into the adjacent grain following the elongation of eta phase to form a cellular structure. The detailed GB migration mechanism is investigated by EBSD and rationalized from the aspect of interface energy. For the formation of eta phase in grain interior, three relative reactions are clarified: (i) MC+gamma -> M23C6+OA-gamma ', OA-gamma '->eta, (ii) gamma -> M23C6+OA-gamma ', OA-gamma '->eta, and (iii) gamma '-> OA-gamma ', OA-gamma '->eta, where OA-gamma ' is the newly precipitated gamma ' phase during over-aging which shares a similar elemental distribution with eta. The intermediate phase OA-gamma ' is formed due to the comparably low nucleation barrier from gamma while its subsequent transformation to eta is excited by the higher thermodynamic stability of eta as revealed by the calculation results by using the VASP software. At last, as conformed by STEM-HAADF, the structure transformation of OA-gamma '->eta is aided by the introduce of superlattice intrinsic stacking faults.
关键词	Nickel-based superalloy eta-Ni3Ti phase Crystallographic variant Cellular precipitation Phase transformation
资助者	National Natural Science Foundation of China ; National Major Science and Technology Projects of China
DOI	10.1016/j.jmrt.2024.01.156
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[J2019-VI -0004-0118] ; National Major Science and Technology Projects of China[J2019 -VII -0002-0142] ; National Major Science and Technology Projects of China[52001314] ; [52101024]
WOS研究方向	Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:001176465400001
出版者	ELSEVIER
引用统计	被引频次：9[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/185015
专题	中国科学院金属研究所
通讯作者	Ma, Yingche
作者单位	Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hou, Kunlei,Ou, Meiqiong,Xing, Weiwei,et al. The formation of η-Ni₃Ti phase microstructure in a cast nickel-based superalloy with high Ti/Al ratio[J]. JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,2024,29:764-778.
APA	Hou, Kunlei.,Ou, Meiqiong.,Xing, Weiwei.,Ma, Guangcai.,Hao, Xianchao.,...&Ma, Yingche.(2024).The formation of η-Ni₃Ti phase microstructure in a cast nickel-based superalloy with high Ti/Al ratio.JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T,29,764-778.
MLA	Hou, Kunlei,et al."The formation of η-Ni₃Ti phase microstructure in a cast nickel-based superalloy with high Ti/Al ratio".JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T 29(2024):764-778.