Journal
CORROSION SCIENCE
Volume 139, Issue -, Pages 355-369Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2018.05.013
Keywords
alpha-Al2O3; SEM; Grain boundary diffusion; Dislocation diffusion; High temperature oxidation
Funding
- National Natural Science Foundation of China [51474239]
- Hunan Provincial Science and Technology Program of China - Huxiang Youth Talent Plan [2017RS3002]
- State Key Laboratory of Powder Metallurgy Foundation, Central South University, Changsha, China
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A composition- and temperature-dependent mobility database including bulk, grain boundary and dislocation diffusion in alpha-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 alpha-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.
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