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Oxidation-induced cavity formation in binary β-NiAl alloys

  • D. Zimmermann , M. Bobeth , M. Rühle and D. R. Clarke EMAIL logo
Published/Copyright: December 20, 2021

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.


Professor David R. Clarke, Materials Department, College of Engineering, University of California, Santa Barbara, Tel.:+1 805 893 8275, Fax: +1 805 893 8983

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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Received: 2003-07-25
Accepted: 2003-10-22
Published Online: 2021-12-20

© 2004 Carl Hanser Verlag, München

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