Oxygen diffusivity in alumina scales grown on Al-MAX phases

Authors

James L. Smialek, NASA Glenn Research CenterFollow

Date of this Version

2015

Citation

Corrosion Science 91 (2015) 281–286

Comments

U.S. Government Work

Abstract

Ti₃AlC₂, Ti₂AlC, and Cr₂AlC are oxidation resistant MAX phase compounds distinguished by the formation of protective Al₂O₃ scales with well controlled kinetics. A modified Wagner treatment was used to calculate interfacial grain boundary diffusivity from scale growth rates and corresponding interfacial grain size, based on the pressure dependence of oxygen vacancies and diffusivity. MAX phase data from the literature yielded grain boundary diffusivity nearly coincident with that for Zr-doped FeCrAl (and many other FeCrAl alloys), suggesting similar oxidation mechanisms. The consolidated body of diffusivity data was consistent with an activation energy of 375 ± 25 kJ/mol.