Article ID Journal Published Year Pages File Type
7893441 Corrosion Science 2018 40 Pages PDF
Abstract
A composition- and temperature-dependent mobility database including bulk, grain boundary and dislocation diffusion in α-Al2O3 was developed. Three sets of mobility parameters for aluminum diffusion were evaluated. The experimental results including mass gain, oxide scale microstructure resulting from aluminum exposed at 1623 K under PO2 = 0.21 bar for 24 h were presented. Kinetic modeling of oxidation of pure aluminum were performed using CALPHAD method. The parameter set supporting that aluminum diffusion in α-Al2O3 has similar order of magnitude with oxygen diffusion can reproduce the experimental oxide thicknesses with good accuracy. Both simulations and experiments indicate internal and external oxidation occur simultaneously.
Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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