Abstract
The effect of isothermal pre-oxidation treatments on the β-(Ni,Pt)Al + IDZ + René N5 system degradation is reported here. The pre-oxidation treatments were carried out from 900 °C (mostly θ-Al2O3 growing conditions) to 1200 °C (mainly α-Al2O3 growing conditions) for 5 h, under an Ar-stream with pO2 = 1 × 10−5 atm. The correlation between the structural, microstructural, and chemical properties of the β-(Ni,Pt)Al BC show that pre-oxidation parameters have an important effect on the multi-elemental counter diffusion phenomena along the BC. Heat treatments performed above 1100 °C resulted in loss of stability of the BC, partially disordering of the β phase promoting the β → β + L10 and β → β + L12 transformations. A significant BC + IDZ thickness increase of 55% at 1200 °C was observed with respect to the as-received specimen resulting in a severe BC degradation. Multi-elemental inward diffusion is the main mechanism responsible for BC degradation at high temperatures.
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