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The Growth Kinetics of Nickel Aluminide Coatings by the Bi-velocity Method

Authors

  • Bartek Wierzba,

    Corresponding author
    1. Interdisciplinary Centre for Materials Modeling, FMSci&C, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków (Poland)
    • Interdisciplinary Centre for Materials Modeling, FMSci&C, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków (Poland)
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  • Marek Danielewski,

    1. Interdisciplinary Centre for Materials Modeling, FMSci&C, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków (Poland)
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  • Katarzyna Tkacz-Śmiech,

    1. Interdisciplinary Centre for Materials Modeling, FMSci&C, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków (Poland)
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  • Jan Sieniawski

    1. Research and Development Laboratory for Aerospace Materials in Rzeszow, W. Pola 2, 35-959 Rzeszów (Poland)
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  • This work was supported by the Ministry of Higher Education and Science in Poland, project N N507 505138. The CVD experiments were performed in Research and Development Laboratory for Aerospace Materials in Rzeszow. The rCADiff software was used in calculations (available from authors).

Abstract

In this work we solve the problem of the simultaneous growth and competition of intermediate phases. The crystal lattice as the frame of reference for diffusion is defined, based on the volume continuity equation. It permits the computation of the material velocity in a system in which reactions at several moving interfaces occur. All reactions lead to the lattice shift due to the difference of diffusivities and molar volumes. We simulate the CVD process followed by annealing in a non-oxidizing atmosphere. The computed kinetics and concentration profiles are compared with experimental results.

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