Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7893441 | Corrosion Science | 2018 | 40 Pages |
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 1623â¯K under PO2â¯=â¯0.21 bar for 24â¯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.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Na Ta, Lijun Zhang, Qin Li, Zhao Lu, Yan Lin,