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Mechanisms and control of phase transition in thermally grown aluminas

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3 Author(s)
Veal, B.W. ; Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439 ; Paulikas, A.P. ; Birtcher, R.C.

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The oxidation rate of β-NiAl, at 1100 °C in air, can be slowed by means of a mechanical polish with α-Al2O3 grit. Particles embedded during polishing act as nucleation sites for conversion of the initially formed θ-Al2O3 to the stable α-Al2O3 phase. Since θ-phase growth is much faster than α-phase growth, accelerated θ→α conversion results in a thinner oxide when conversion is complete. A model is presented to quantitatively describe this behavior.

Published in:

Applied Physics Letters  (Volume:89 ,  Issue: 16 )

Date of Publication:

Oct 2006

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