Abstract
The role of the (Fe,Al)2Nb Laves phase on the high temperature oxidation mechanisms of Fe–26Al–4Nb (at%) was investigated between 700 °C and 1000 °C in air for 500 h. The (Fe,Al)2Nb Laves phase that was already present in as-cast state was selectively oxidised at all temperatures but showed the formation of different oxides including Fe2O3, AlNbO4, and Al-rich oxide depending on test temperature. Unharmed (Fe,Al)2Nb was newly formed below the oxide scale at 700 °C and 800 °C, while at 900 °C and 1000 °C no unharmed Laves phase below the oxide layer was observed. The discontinuous isothermal testing showed a change of kinetics at 700 °C and 800 °C after 10 h of oxidation. At 1000 °C, the (Fe,Al)2Nb Laves phase was additionally identified to initiate oxide spallation.
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