Abstract
The presence of H2O vapour in an oxidizing environment can increase the critical aluminium concentration, NAl*, required to establish a passivating Al2O3 scale in multicomponent alumina-forming alloys. This work used AlxFeyNi1−x−y composition spread alloy film combinatorial libraries to determine NAl*(x, y) continuously across AlxFeyNi1−x−y composition space (x=0→1, y=0→[1−x]) in a 10% H2O/air mixture at 427°C. The NAl*(x, y) in this environment was significantly higher across much of composition space than that previously measured in dry air. Physical insights from the observed differences are considered using a modified Wagner–Maak model.
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