Interdiffusion in the Al-V System in the 800-1000 °C Temperature Range.
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| Title: | Interdiffusion in the Al-V System in the 800-1000 °C Temperature Range. |
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| Authors: | Silveira, V. M.1 (AUTHOR) vitoria.melo.silveira@usp.br, Chaia, N.2 (AUTHOR) nabil.chaia@unifal-mg.edu.br, Borowski, K. E.1 (AUTHOR) karoline.borowski@usp.br, Ramos, A. S.2 (AUTHOR) alfeu.ramos@unifal-mg.edu.br, Ramos, E. C.2 (AUTHOR) erika.ramos@unifal-mg.edu.br, Nunes, C. A.1 (AUTHOR) cnunes@usp.br, Coelho, G. C.1 (AUTHOR) gilberto.coelho@usp.br |
| Source: | Journal of Phase Equilibria & Diffusion. Feb2025, Vol. 46 Issue 1, p204-214. 11p. |
| Subjects: | Liquid metal fast breeder reactors, Sodium cooled reactors, Diffusion coatings, Vanadium alloys, Liquid sodium |
| Abstract: | Vanadium and its alloys have potential for application as fuel cladding in new fast breeder reactors cooled by sodium. Diffusion aluminide coatings could be a solution of choice in providing protection against high-temperature corrosion by liquid sodium or residual oxygen for these materials. In this work, multilayered coatings were formed on V and V-44Al substrates by halide activated pack cementation, using CrCl3 as transport agent and pure aluminum (high activity) as master alloy. Two types of diffusion couples, V/Al and V-44Al/Al, were investigated in order to determine the growth kinetics of the aluminide compounds in the 800-1000 °C temperature range. The growth of the saturated Vss as well as of the VAl3 and V5Al8 layers was controlled exclusively by solid state diffusion following a parabolic law, allowing the determination of the parabolic growth constants. Wagner's analysis was adopted to calculate the integrated interdiffusion coefficients, resulting in values ranging approximately from 10−10 to 10−12 cm2/s for temperatures between 800 and 1000 °C. In general, VAl3 has the highest D ~ int values in relation to those of the other two layers, considering the nominal temperatures (except for 1000 °C). [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | Vanadium and its alloys have potential for application as fuel cladding in new fast breeder reactors cooled by sodium. Diffusion aluminide coatings could be a solution of choice in providing protection against high-temperature corrosion by liquid sodium or residual oxygen for these materials. In this work, multilayered coatings were formed on V and V-44Al substrates by halide activated pack cementation, using CrCl3 as transport agent and pure aluminum (high activity) as master alloy. Two types of diffusion couples, V/Al and V-44Al/Al, were investigated in order to determine the growth kinetics of the aluminide compounds in the 800-1000 °C temperature range. The growth of the saturated Vss as well as of the VAl3 and V5Al8 layers was controlled exclusively by solid state diffusion following a parabolic law, allowing the determination of the parabolic growth constants. Wagner's analysis was adopted to calculate the integrated interdiffusion coefficients, resulting in values ranging approximately from 10−10 to 10−12 cm2/s for temperatures between 800 and 1000 °C. In general, VAl3 has the highest D ~ int values in relation to those of the other two layers, considering the nominal temperatures (except for 1000 °C). [ABSTRACT FROM AUTHOR] |
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| ISSN: | 15477037 |
| DOI: | 10.1007/s11669-025-01179-2 |
