التفاصيل البيبلوغرافية
| العنوان: |
Microstructural evolution and element interdiffusion of NiAlHf and NiAlHfY coatings deposited on a Ni-based superalloy. |
| المؤلفون: |
Li, Xiaoya1,2 (AUTHOR), Zou, Jianpeng1 (AUTHOR) zoujp@csu.edu.cn, Shi, Qian1,2 (AUTHOR) shiqian@gdinm.com, Dai, Mingjiang2 (AUTHOR), Yang, Hongzhi2 (AUTHOR), Lin, Songsheng2 (AUTHOR), Zhang, Cheng2 (AUTHOR), Liu, Yingkun2 (AUTHOR), Tang, Peng2 (AUTHOR), Su, Yifan2 (AUTHOR) |
| المصدر: |
Surface & Coatings Technology. Dec2022, Vol. 451, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*LAVES phases (Metallurgy), *DIFFUSION, *ION plating, *HEAT resistant alloys, *SURFACE coatings, *LEAD, *SINGLE crystals |
| مستخلص: |
The NiAlHf and NiAlHfY coatings were deposited on a nickel-based single crystal superalloy using arc ion plating technology. The microstructural evolution and element interdiffusion behavior of the NiAlHf and NiAlHfY coatings were investigated under a 1200 °C thermal exposure process. The results showed that the NiAlHfY coating had a higher residual Al content and fewer topologically close-packed (TCP) phases, which implied that Y effectively retarded the diffusion rate of related elements. Besides, the inward diffusion of Al and outward diffusion of Ni lead to a γ → γ´ phase change and the formation of different TCP phases, resulting from the main precipitating elements (Cr, Mo, Re, W, and Ta) having a lower solubility in γ´. Moreover, it is found that the σ and Laves phase precipitate in the interdiffusion zone, which is described by an intergrowth relationship, where the σ phase is a metastable phase and plays a key role in forming the Laves phase. Finally, the interdiffusion mechanism of the elements is proposed. • The residual content of Al in NiAlHfY coating (about 30 at. %) is higher than than of NiAlHf coating (about 20 at. %) after oxidation 200 h. • The number of TCP phases in NiAlHfY coating is lesser than that of NiAlHf coating. • The rod-like and blocky σ and Laves phases are precipitated in IDZ, and needle-like σ phase is precipitated in SRZ. • σ phase and Laves phase have an intergrowth relationship, σ phase serves as the nucleation site for Laves phase. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
