The morphology of Al{sub 2}O{sub 3} scales: indicators of phase, growth mechanisms, and grain boundary segregation

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Advanced analysis over the past decade has resulted in increased understanding of the formation, growth, and adhesion of alumina scales. It is proposed that this can now be inferred from SEM images of the AL{sub 2}O{sub 3} scale morphology. The presence of bladelike grains is an indicator of metastable alumina phases and an outward growth mechanism. Large surface ridges indicate that the scale has transformed to {alpha}-Al{sub 2}O{sub 3}. A columnar grain structure is associated with an inward growth mechanism, while an equiaxed grain structure typically forms when both Al and O diffusion is occurring. Grain boundary segregation typically results ... continued below

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6 p.

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Pint, B. A. December 31, 1996.

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Advanced analysis over the past decade has resulted in increased understanding of the formation, growth, and adhesion of alumina scales. It is proposed that this can now be inferred from SEM images of the AL{sub 2}O{sub 3} scale morphology. The presence of bladelike grains is an indicator of metastable alumina phases and an outward growth mechanism. Large surface ridges indicate that the scale has transformed to {alpha}-Al{sub 2}O{sub 3}. A columnar grain structure is associated with an inward growth mechanism, while an equiaxed grain structure typically forms when both Al and O diffusion is occurring. Grain boundary segregation typically results in a fine grain size at the scale-gas interface. Examples are given from Ni- and Fe-base alumina formers ({beta}-NiAl, FeCrAl, iron aluminides) to illustrate these correlations. 5 figs, 35 refs, 1 tab.

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6 p.

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OSTI as DE97003608

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  • 190. meeting of the Electrochemical Society and technical exhibition, San Antonio, TX (United States), 6-11 Oct 1996

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  • Other: DE97003608
  • Report No.: CONF-961040--22
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 459973
  • Archival Resource Key: ark:/67531/metadc675164

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  • December 31, 1996

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  • July 25, 2015, 2:21 a.m.

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  • Oct. 3, 2017, 1:35 p.m.

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Pint, B. A. The morphology of Al{sub 2}O{sub 3} scales: indicators of phase, growth mechanisms, and grain boundary segregation, article, December 31, 1996; Tennessee. (digital.library.unt.edu/ark:/67531/metadc675164/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.