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Effect of Y Additions on the Oxidation Behaviour of Novel Refractory High-Entropy Alloy NbMoCrTiAl at 1000 °C in Air

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Abstract

In this work, the influence of 0.5 at.% and 1 at.% Y additions on the high-temperature oxidation resistance of the equiatomic alloy NbMoCrTiAl at 1000 °C in air was investigated. Continuous isothermal and cyclic thermogravimetric experiments were conducted to characterize the oxidation kinetics of the alloys. Various analytical methods such as X-ray diffraction and electron microscopy with energy-dispersive X-ray spectroscopy were used to study the growth, morphology and composition of the oxide scales. It was found that the Y additions led to the formation of Al2Y phase along grain boundaries. The isothermal oxidation experiments of both Y-containing alloys showed lower oxidation rates after a short period of transient oxidation probably due to a reduction of fast-growing and voluminous Nb2O5 oxides within the oxide layer. During the steady-state period, however, oxidation of Al2Y caused local stresses resulting in crack formation and subsequent breakaway oxidation, i.e. pronounce increase in the oxidation rates. The cyclic oxidation experiments revealed lower oxidation rates and thinner, more adherent oxide scales formed on the alloy NbMoCrTiAl1Y compared to NbMoCrTiAl. The increased scale adherence was attributed to the formation of pegs due to the oxidation of Al2Y phase at the oxide/metal interface.

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Acknowledgements

The financial support by the Deutsche Forschungsgemeinschaft (DFG), Grant Nos. GO 2283/2-1, GO 2283/4-1, HE 1872/31-1 and HE 1872/34-1, is gratefully acknowledged. The part of this work was performed at the Micro- and Nanoanalytics Facility (MNaF) of the University of Siegen.

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Authors and Affiliations

  1. Institut für Werkstofftechnik, Universität Siegen, Siegen, Germany

    Franz Müller, Bronislava Gorr & Hans-Jürgen Christ

  2. Institut für Angewandte Materialien, Karlsruher Institut für Technologie (KIT), Karlsruhe, Germany

    Hans Chen, Alexander Kauffmann & Martin Heilmaier

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  1. Franz Müller
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  2. Bronislava Gorr
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  3. Hans-Jürgen Christ
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Correspondence to Franz Müller.

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Müller, F., Gorr, B., Christ, HJ. et al. Effect of Y Additions on the Oxidation Behaviour of Novel Refractory High-Entropy Alloy NbMoCrTiAl at 1000 °C in Air. Oxid Met 94, 147–163 (2020). https://doi.org/10.1007/s11085-020-09983-6

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