Composition-dependent interdiffusivity matrices of ordered bcc_B2 phase in ternary Ni–Al–Ru system at 1273∼1473 K
Author:
Li Qin1, Zhong Jing1, Tang Ying2, Deng Chunming3, Zhang Lijun13ORCID
Affiliation:
1. State Key Laboratory of Powder Metallurgy , Central South University , Changsha , P.R. China 2. School of Materials Science and Engineering , Hebei University of Technology , Tianjin , P.R. China 3. Guangdong Academy of Sciences , Institute of New Materials, National Engineering Laboratory for Modern Materials Surface Engineering Technology, The key Lab of Guangdong for Modern Surface Engineering Technology , Guangzhou , P.R. China
Abstract
Abstract
In this paper, 5 Ni–Al–Ru ternary and 2 NiAl/RuAl binary equilibrium alloys were prepared, and their lattice parameters were evaluated by using the X-ray diffraction technique. The relation between the lattice parameters and Ru content satisfies Vegard’s law, confirming that a continuous single bcc_B2 phase exists between NiAl and RuAl in the ternary Ni–Al–Ru system. After that, three diffusion couples located in the bcc_B2 phase region were prepared at 1273, 1373 and 1473 K, respectively. With the presently measured concentration profiles, the composition-dependent interdiffusivity matrices along the entire diffusion paths were efficiently determined by using the High-throughput Determination of Interdiffusion Coefficients (HitDIC) software. The obtained interdiffusivities show a good agreement with the limited experimental data in the literature. Furthermore, the present results show that the addition of Ru to bcc_B2 NiAl alloys can significantly inhibit the interdiffusion rate of Ni, indicating that the bcc_B2 Ru-containing NiAl bond coats can serve as a potential diffusion barrier for Ni-based superalloy substrate.
Funder
Fundamental Research Funds for the Central Universities
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
Reference56 articles.
1. Tawancy, H. M., Abbas, N. M., Bennett, A. Surf. Coating. Technol. 1994, 68/69, 10. https://doi.org/10.1016/0257-8972(94)90130-9. 2. Pollock, T. M., Tin, S. J. Propul. Power 2006, 22, 361. https://doi.org/10.2514/1.18239. 3. Reed, R. C., Tao, T., Warnken, N. Acta Mater. 2009, 57, 5898. https://doi.org/10.1016/j.actamat.2009.08.018. 4. Duan, Y. H., Zhang, P., Li, J., Li, B., Song, X. L., Gong, X. F., Yang, G. X. J. Cent. South Univ. 2020, 27, 325. https://doi.org/10.1007/s11771-020-4298-x. 5. Meier, S. M., Gupta, D. K. J. Eng. Gas Turbines Power 1994, 116, 250. https://doi.org/10.1115/1.2906801.
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