Abstract
Previously, it has been established that oxidation-induced cavitation of binary NiAl alloys occurs primarily when Nirich compositions are oxidized. In this work it is shown that at 1100 °C cavities form principally during the very early stages of oxidation for these compositions. During this time, the growing oxide is a transient, theta-alumina whereas on the Al-rich compositions the growing oxide rapidly transforms to alpha alumina. It is concluded that cavity formation is associated with tensile stresses generated by the flux divergence created by the outward diffusion of Al during the growth of theta-alumina and the inward diffusion of nickel. Once the transient oxide transforms to alpha alumina, the outward flux of aluminum is decreased and with it the flux divergence. Values for the inter-diffusion coefficients for the alloys investigated, derived from the diffusion profiles, are also reported.
Funding statement: The authors are grateful to Professor Grabke of the Max-Planck-Institut für Eisenforschung in Düsseldorf for kindly providing some of the NiAl single crystals studied in this work and to Dr. Vladimir Tolpygo for lively discussions. The work performed in Stuttgart was supported by the Max-Planck Society and that at UC Santa Barbara was supported by the Office of Naval Research under grant number N00014-97-1-0190
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© 2004 Carl Hanser Verlag, München
Articles in the same Issue
- Frontmatter
- Articles BBasic
- Thermodynamic modeling of the Rh–Zr system
- Ni grain boundary diffusion in coarse-grained Fe-40 wt.% Ni alloy and comparison with Ni diffusion in the nanocrystalline alloy
- Crystallization kinetics of an amorphous Zr70Cu20Ni10 alloy
- Oxidation-induced cavity formation in binary β-NiAl alloys
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- Model of artificial neural network for complex data analysis in slag glass-ceramic
- Quantitative investigation of material erosion caused by high-pressure discharges in air and nitrogen
- Role of alloying elements on machinability of plastic-molding steels
- A simple model for the strength and elongation of ultra-fine grained low carbon steels
- Notifications/Mitteilungen
- Personal/Personelles
- Conferences/Konferenzen
Articles in the same Issue
- Frontmatter
- Articles BBasic
- Thermodynamic modeling of the Rh–Zr system
- Ni grain boundary diffusion in coarse-grained Fe-40 wt.% Ni alloy and comparison with Ni diffusion in the nanocrystalline alloy
- Crystallization kinetics of an amorphous Zr70Cu20Ni10 alloy
- Oxidation-induced cavity formation in binary β-NiAl alloys
- Articles AApplied
- Influences of counterface materials and reinforcements on the sliding wear of copper matrix composites
- Model of artificial neural network for complex data analysis in slag glass-ceramic
- Quantitative investigation of material erosion caused by high-pressure discharges in air and nitrogen
- Role of alloying elements on machinability of plastic-molding steels
- A simple model for the strength and elongation of ultra-fine grained low carbon steels
- Notifications/Mitteilungen
- Personal/Personelles
- Conferences/Konferenzen