Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10621110 | Acta Materialia | 2005 | 11 Pages |
Abstract
The relationships between the compositional changes in the alloy and the morphology and phase constitution of the developing oxide scale are established as a function of oxidation time for the thermal oxidation of a γ-Ni-27Cr-9Al (at.%) alloy at 1373 K and a high and low partial oxygen pressure (pO2) of 2 Ã 104 and 0.1 Pa, respectively. Based on experimental observations, and model calculations using a coupled thermodynamic-kinetic oxidation model, four successive growth stages can be identified for the oxidation of a γ-Ni-27Cr-9Al alloy at 1373 K. It is shown that the exclusive growth of α-Al2O3 is promoted for oxidation at low pO2 by maintaining a sufficiently high concentration of Al in the alloy at the oxide/metal interface during the initial stages of fast oxide-scale growth.
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Authors
T.J. Nijdam, L.P.H. Jeurgens, W.G. Sloof,