The formation of η-Ni3Ti phase microstructure in a cast nickel-based superalloy with high Ti/Al ratio
文献类型：期刊论文
| 作者 | Hou, Kunlei; Ou, Meiqiong; Xing, Weiwei; Ma, Guangcai; Hao, Xianchao; Wang, Min; Ma, Yingche |
| 刊名 | JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
 |
| 出版日期 | 2024-03-01 |
| 卷号 | 29页码:764-778 |
| 关键词 | Nickel-based superalloy eta-Ni3Ti phase Crystallographic variant Cellular precipitation Phase transformation |
| ISSN号 | 2238-7854 |
| DOI | 10.1016/j.jmrt.2024.01.156 |
| 通讯作者 | Ma, Yingche(ycma@imr.ac.cn) |
| 英文摘要 | 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. |
| 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 |
| 语种 | 英语 |
| WOS记录号 | WOS:001176465400001 |
| 出版者 | ELSEVIER |
| 资助机构 | National Natural Science Foundation of China ; National Major Science and Technology Projects of China |
| 源URL |  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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