Abstract
The morphological stability of an oxide layer during selective oxidation of a binary alloy is investigated theoretically for the case of inward oxygen diffusion. According to the result of a linear stability analysis, a roughening of a planar oxide-metal interface can occur if interdiffusion in the alloy is rate determining. The wavelength of the most unstable mode is evaluated taking into account interface smoothing via volume and interface diffusion. For parabolic scale growth, the wavelength increases with time according to the power law t 1 4 for volume diffusion and t 1 6 for interface diffusion. The theoretical results are compared with recent experiments on the oxidation of γ′-Ni 3Al at low oxygen partial pressure where protrusions of the oxide into the metal were found in the initial stage of oxidation. The observed smoothing of the interface in the course of further oxidation is interpreted as a transition from metal-to oxygen-diffusion controlled growth.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.