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High temperature oxidation of an oxide-dispersion strengthened NiAl |
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| Authors: | W. W. Lee D. B. Lee M. H. Kim S. C. Ur |
| Affiliation: | a School of Metallurgical and Materials Engineering, Sungkyunkwan University, Suwon, 440-746, South Korea b Department of Materials Science and Engineering, Chungju National University, Chungju, 380-702, South Korea |
| Abstract: | The oxidation behavior of an oxide-dispersion strengthened (ODS) NiAl has been studied between 900 and 1100°C in air. The dispersoids of mostly Al2O3 in fine-grained β-NiAl were incorporated by mechanical alloying (MA) in an argon atmosphere and hot pressing. It was found that excessive amounts of dispersoids and voids within the matrix had serious negative effects on the oxidation resistance of β-NiAl, by allowing for a more rapid formation of oxide scales and by providing fast diffusion paths for oxygen. Below the thin surface oxide scales consisted of -Al2O3, NiAl2O4 and Ni2O3, an internal oxidation zone was formed deep into the matrix. No metastable transient aluminas were formed during oxidation. The oxide ridge structure began to evolve after oxidation at 1100°C at the oxide–gas interface. |
| Keywords: | A. Nickel aluminides, based on NiAl B. Oxidation C. Mechanical alloying |
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