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The paper concerns the deposition and high temperature oxidation behavior of simple aluminide and SiAl coatings on the TiAl-based alloy TNB-V5. The coatings were produced using pack cementation method with varying content of Si and Al in the pack. The samples were thermally cycled at 850 °C in 23 h cycles up to 131 cycles (total of 3013 hours) in order to obtain mass change curves. The results of cyclic oxidation tests were related to the microstructure of the as deposited coatings. Special effort has been done in order to study the growth of protective oxide scales as well as the evolution of the metal-scale interfaces in detail using analytical high resolution Scanning Transmission Electron Microscopy (STEM).

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