Characterisation of oxide scale formation on a new single crystal superalloy for power generation applications

Journal article

The oxidation behaviour at 950°C of a prototype nickel-based single crystal superalloy containing ~15 wt%Cr is studied, with and without silicon alloying. It is demonstrated that the alloy is a marginal alumina former, with further alloying by Si promoting the formation of a continuous, protective alumina scale. Transmission electron microscopy reveals that out-growing alumina forms during the early stages of oxidation. The presence of silicon within the alumina is detected using atom probe tomography.

Authors: Sato, A; Chiu, Y; Marquis, E; Reed, R

• Publication status: Published
• Journal: MATERIALS AT HIGH TEMPERATURES
• Volume: 29
• Issue: 3
• Pages: 272-278
• Publication date: 2012-08-01
• DOI: 10.3184/096034012X13335334078005
• ISSN: 0960-3409
• Language: English
• Keywords: oxidation; heterogeneous nucleation of phase transformations; nickel alloys; kinetics; superalloy