Characterization of Thermally-Cycled Alumina Scales

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Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni-20at% Cr-19Al-0.05Y after 100, 1h cycles at 1100 C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni-49at% Al-2Cr were also characterized. With the addition of Cr, the formation of {alpha}-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated ... continued below

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Pint, B.A. October 22, 2001.

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Cross-sectional transmission electron microscopy was used to characterize the alumina scales formed on several Ni-base alumina-formers. The alumina scale microstructure of Ni-20at% Cr-19Al-0.05Y after 100, 1h cycles at 1100 C was compared to an isothermally-grown scale. Despite being near the onset of mass loss in cyclic testing, very few defects were noted in either scale microstructure. The more adherent scales that form on Hf-doped NiAl and Ni-49at% Al-2Cr were also characterized. With the addition of Cr, the formation of {alpha}-Cr precipitates at the metal-oxide interface coincided with increased long-term scale spallation. No similar precipitation mechanism was observed to be associated with scale spallation on NiCrAlY.

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  • 4th Microscopy of Oxidation Conference, Cambridge (GB), 09/20/1999--09/22/1999

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  • Report No.: P00-106215
  • Grant Number: AC05-00OR22725
  • Office of Scientific & Technical Information Report Number: 788669
  • Archival Resource Key: ark:/67531/metadc715078

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  • October 22, 2001

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  • Sept. 29, 2015, 5:31 a.m.

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  • March 29, 2016, 4:13 p.m.

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Pint, B.A. Characterization of Thermally-Cycled Alumina Scales, article, October 22, 2001; Tennessee. (digital.library.unt.edu/ark:/67531/metadc715078/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.