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Effect of Ta on microstructural evolution of NiCrAlYSi coated Ni-base single crystal superalloys
Yin, Bin; Xie, Guang; Lou, Langhong; Zhang, Jian
2020-07-15
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
Volume829
AbstractThe effect of Ta on microstructural evolution of NiCrAlYSi coated Ni-base single crystal superalloys at 1000 degrees C and 1100 degrees C has been investigated. Interdiffusion occurs between the NiCrAlYSi coating and the substrate, leading to the formation of inter-diffusion zone (IDZ) and secondary reaction zone (SRZ). After exposure at 1000 degrees C for 100 h, the initial gamma/gamma' transforms to gamma' phases in the IDZ, and SRZ with sigma and mu topologically close-packed (TCP) phases is formed primarily due to the inward diffusion of Al. Different behavior of SRZ formation in the alloys with various Ta content can be observed after exposure at 1000 degrees C, which highlights the potency of Ta addition in promoting SRZ formation. This may be ascribed to the fact that Ta promotes the precipitation of TCP phases. After exposure at 1100 degrees C for 100 h, the initial gamma/gamma' transforms to y layer and coarse gamma' phases in the IDZ, and no SRZ can be found. The formation of IDZ is significantly suppressed by Ta addition, which may be related to the retardation of interdiffusion between the coating and the substrate due to the increased gamma' volume fraction. Furthermore, gamma' rafting parallel to and/or perpendicular to the coating/substrate interface in the substrate beneath IDZ are found in the alloys after exposure at 1000 degrees C and 1100 degrees C. Microstructural observation shows that Ta has a potent influence on the development of perpendicular gamma' rafting. The mechanism of parallel gamma' rafting and perpendicular gamma' rafting has been discussed, respectively. (C) 2020 Elsevier B.V. All rights reserved.
DOI10.1016/j.jallcom.2020.154440
WOS IDWOS:000523555300039
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/82697
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Yin, Bin,Xie, Guang,Lou, Langhong,et al. Effect of Ta on microstructural evolution of NiCrAlYSi coated Ni-base single crystal superalloys[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,829.
APA Yin, Bin,Xie, Guang,Lou, Langhong,&Zhang, Jian.(2020).Effect of Ta on microstructural evolution of NiCrAlYSi coated Ni-base single crystal superalloys.JOURNAL OF ALLOYS AND COMPOUNDS,829.
MLA Yin, Bin,et al."Effect of Ta on microstructural evolution of NiCrAlYSi coated Ni-base single crystal superalloys".JOURNAL OF ALLOYS AND COMPOUNDS 829(2020).
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