Interfacial segregation in oxide scales on NiCrAl-based alloys

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Previous studies addressing the segregation of reactive elements in protective oxide scales and their beneficial effect on scale adhesion have primarily concentrated on primary alumina-formers. In this study the isothermal oxidation behavior of three NiCrAl alloys, which form complex oxide scales was studied in air at 1,473 K for 100 hrs. The resulting oxide scales were characterized by scanning electron microscopy (SEM) and cross=sectional transmission electron microscopy (TEM) techniques. Segregation at internal interfaces was analyzed in the STEM mode on a Philips CM200 FEG-TEM, operated at 200 kV and equipped with a Link ultrathin-window EDS detector. The probe size of ... continued below

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3 p.

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Pruessner, K.; Alexander, K.B.; Pint, B.A.; Tortorelli, P.F. & Wright, I.G. April 1, 1997.

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Description

Previous studies addressing the segregation of reactive elements in protective oxide scales and their beneficial effect on scale adhesion have primarily concentrated on primary alumina-formers. In this study the isothermal oxidation behavior of three NiCrAl alloys, which form complex oxide scales was studied in air at 1,473 K for 100 hrs. The resulting oxide scales were characterized by scanning electron microscopy (SEM) and cross=sectional transmission electron microscopy (TEM) techniques. Segregation at internal interfaces was analyzed in the STEM mode on a Philips CM200 FEG-TEM, operated at 200 kV and equipped with a Link ultrathin-window EDS detector. The probe size of the electron beam was about 1.5 nm. Spectra were recorded with grain boundaries oriented parallel to the electron beam. The oxide scale on Rene N5 ({approximately}5 {micro}m) consists of columnar {alpha}-Al{sub 2}O{sub 3} at the bottom ({approximately}4 {micro}m) and a mixed layer of spinel (Ni, Co, Ta) (Al,Cr){sub 2}O{sub 4} and {alpha}-Al{sub 2}O{sub 3} ({approximately}1 {micro}m) at the top. On Ni-7Cr-6.5Al+Y, the scale ({approximately}9 {micro}m) consists mainly of columnar Cr-doped {alpha}-Al{sub 2}O{sub 3}. Ni-10Cr-10Al+Y forms an oxide scale ({approximately}8 {micro}m) that consists mainly of columnar Cr-doped {alpha}-Al{sub 2}O{sub 3}. The results are consistent with previous results on primary alumina-formers.

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3 p.

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OSTI as DE97005155

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  • Microscopy and Microanalysis `97, Cleveland, OH (United States), 10-14 Aug 1997

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  • Other: DE97005155
  • Report No.: CONF-970834--12
  • Grant Number: AC05-96OR22464
  • DOI: 10.2172/505349 | External Link
  • Office of Scientific & Technical Information Report Number: 505349
  • Archival Resource Key: ark:/67531/metadc689883

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  • April 1, 1997

Added to The UNT Digital Library

  • Aug. 14, 2015, 8:43 a.m.

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  • Jan. 19, 2016, 6:52 p.m.

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Pruessner, K.; Alexander, K.B.; Pint, B.A.; Tortorelli, P.F. & Wright, I.G. Interfacial segregation in oxide scales on NiCrAl-based alloys, report, April 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc689883/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.