Abstract
The growth kinetics of protective diffusion aluminide coatings were investigated on Ti based alloy Beta-21S. The coating was prepared by halide activated pack cementation using CrCl3 as transport agent and pure aluminum (high activity) as masteralloy. The coating was composed of only TiAl3 layer whose growth was controlled by solid state diffusion following a parabolic law. The morphology of the coating was quite similar with interdiffusion products present in a bulk semi-infinite diffusion couple as showed by previous literature studies. The transport phenomena are significantly affected by the alloying elements present in the alloys and dissolved in the coating layer. The activation energy estimated at 108 kJ mol−1 determined for temperatures in the range 660-760 °C, indicates a bulk diffusion process with a possible grain boundary contribution and/or kinetic limitations associated to the mobility of the gaseous species during the aluminization.
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Acknowledgements
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. The authors would like to thank the BOEING R&T Brazil for providing the Beta-21S plates.
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Chaia, N., Cossu, C.M., Parrisch, C.J. et al. Growth Kinetics of TiAl3 Diffusion Coating by Pack Cementation on Beta 21-S. J. Phase Equilib. Diffus. 41, 181–190 (2020). https://doi.org/10.1007/s11669-020-00819-z
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DOI: https://doi.org/10.1007/s11669-020-00819-z