Abstract
The residual stress in the oxide scale formed on polycrystalline Ni3Al in air in the range of 900–1200°C was determined at room temperature using optical fluorescence piezospectroscopy. The stress was found to be almost independent of time or temperature of oxidation. In contrast, the spalling behavior was strongly dependent on the oxidation temperature, not occurring below 1100°C and profusely at 1200°C. In the intermediate temperature regime (∼ 1100°C), spallation of the oxide scale occurred preferentially in the vicinity of grain boundaries in the Ni3Al. This is attributed to a buckling instability driven by the residual thermal mismatch stress and induced by both void formation and a non-planar interface structure resulting from preferential diffusion along the Ni3Al grain boundaries.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: 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.
