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The formation and evolution of NiAl phase in a fourth generation nickel-based single crystal superalloy
Song, W.; Wang, X. G.; Li, J. G.; Meng, J.; Duan, T. F.; Yang, Y. H.; Liu, J. L.; Liu, J. D.; Pei, W. L.; Zhou, Y. Z.; Sun, X. F.
2020-12-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
Volume848
AbstractThe formation mechanism of the Ru-rich beta-NiAl phase in a nickel-based single crystal superalloy and its evolution course during the long-term aging were investigated. The beta-NiAl phase confirmed via the XRD and TEM analysis was observed in the solidification process for casting alloy. The intensive study on the formation mechanism of the beta-NiAl phase was conducted based on the analyses of the phase diagram, the incipient melting experiment, and the segregation behavior. In addition, a new phase identified as the 8 phase was also observed in the beta-NiAl phase, which was enriched in Re, Co, W, and Ni. The so- lidification path was determined as L -> beta, L -> beta + delta, L + beta -> gamma', L -> gamma', L -> (gamma + gamma'), which took into consideration the influence of the beta-NiAl phase and the 8 phase. Besides, the high melting point of the beta-NiAl phase induced impediment in homogenizing heat treatment, long-term aging at 1100 degrees C from 100 h to 1000 h was carried out to eliminate the beta-NiAl phase. Hence, the gamma'/beta-NiAl and gamma/beta-NiAl diffusion couples were put forward to interpret the evolution of the beta-NiAl phase during the long-term aging. The TCP phase which was determined as mu phase via the selected diffraction spot was examined in the full heat-treated and long-term aging specimens. The morphology of the TCP phase could be divided into three types: needle-like, rod-like, and bulk-like. The influence of the beta-NiAl phase on the formation of the TCP phase was researched in detail. (C) 2020 Elsevier B.V. All rights reserved.
DOI10.1016/j.jallcom.2020.156584
WOS IDWOS:000573298300007
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Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82291
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Song, W.,Wang, X. G.,Li, J. G.,et al. The formation and evolution of NiAl phase in a fourth generation nickel-based single crystal superalloy[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,848.
APA Song, W..,Wang, X. G..,Li, J. G..,Meng, J..,Duan, T. F..,...&Sun, X. F..(2020).The formation and evolution of NiAl phase in a fourth generation nickel-based single crystal superalloy.JOURNAL OF ALLOYS AND COMPOUNDS,848.
MLA Song, W.,et al."The formation and evolution of NiAl phase in a fourth generation nickel-based single crystal superalloy".JOURNAL OF ALLOYS AND COMPOUNDS 848(2020).
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