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Interdiffusion in β Phase Field of Ternary (Ni, Ru)Al System

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Abstract:

Bond coats play a vital role in multi-layered thermal barrier coatings (TBCs), commonly made of B2 (Ni, Pt)Al. However, the presence of platinum (Pt) makes the bond coats costly. To reduce the overall cost and enhance the working temperature of TBCs, Pt can be partially or completely replaced by ruthenium (Ru). For the development of Ru-based bond coats, understanding the interdiffusion behavior of (Ni, Ru)Al is essential. In the present work, the interdiffusion behavior in the single B2 phase of the ternary (Ni, Ru)Al system was studied at 1100 °C using the diffusion couple technique. Experimental concentration profiles were obtained using an Electron Probe Micro-Analyzer, which was further fitted and analyzed for interdiffusion fluxes by utilizing the MultiDiflux software. Kirkaldy's approach was employed to determine the interdiffusion coefficients in the ternary B2 (Ni, Ru)Al system.

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Periodical:

Defect and Diffusion Forum (Volume 439)

Pages:

105-114

DOI:

https://doi.org/10.4028/p-72P0gI

Citation:

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Online since:

February 2025

Authors:

Sachin Kumar*, Kaustubh N. Kulkarni

Keywords:

B2 Phase, Bond Coat, Interdiffusion Coefficients, MultiDiFlux

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© 2025 Trans Tech Publications Ltd. All Rights Reserved

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