Strain measurements in thermally grown alumina scales using ruby fluorescence

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We have measured strains in alumina scales thermally grown on Fe-Cr- Al alloys by exploiting the strain dependence of the ruby luminescence line. Measurements were done on Fe-5Cr-28Al and Fe-18Cr-10Al (at.%, bal. Fe) oxidized between 300-1300 C with periodic cycling to room temperature. Significantly different levels of strain buildup were observed in scales on these alloys. Results on similar alloys containing a dilute reactive element (Zr or Hf) are also presented. We observe that scales on alloys containing a reactive element (RE) can support higher strains than scales on RE-free alloys. With the luminescence technique, strain relief associated with spallation ... continued below

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13 p.

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Veal, B. W.; Natesan, K.; Koshelev, I.; Grimsditch, M.; Renusch, D. & Hou, P. Y. December 31, 1996.

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Description

We have measured strains in alumina scales thermally grown on Fe-Cr- Al alloys by exploiting the strain dependence of the ruby luminescence line. Measurements were done on Fe-5Cr-28Al and Fe-18Cr-10Al (at.%, bal. Fe) oxidized between 300-1300 C with periodic cycling to room temperature. Significantly different levels of strain buildup were observed in scales on these alloys. Results on similar alloys containing a dilute reactive element (Zr or Hf) are also presented. We observe that scales on alloys containing a reactive element (RE) can support higher strains than scales on RE-free alloys. With the luminescence technique, strain relief associated with spallation thresholds is readily observed. In early stage oxidation, the evolution of transition phases is monitored using Raman and fluorescence spectroscopies. The fluorescence technique also provides a sensitive probe of early stage formation of {alpha}-Al{sub 2}O{sub 3}. It appears that, in presence of Cr{sub 2}O{sub 3} or Fe{sub 2}O{sub 3}, the {alpha}-alumina phase can form at anomalously low temperatures.

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13 p.

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OSTI as DE97001409

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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: DE97001409
  • Report No.: ANL/MSD/CP--91224
  • Report No.: CONF-961040--15
  • Grant Number: W-31109-ENG-38
  • Office of Scientific & Technical Information Report Number: 434919
  • Archival Resource Key: ark:/67531/metadc676433

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  • December 31, 1996

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  • July 25, 2015, 2:20 a.m.

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  • Oct. 3, 2017, 6:42 p.m.

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Veal, B. W.; Natesan, K.; Koshelev, I.; Grimsditch, M.; Renusch, D. & Hou, P. Y. Strain measurements in thermally grown alumina scales using ruby fluorescence, article, December 31, 1996; Illinois. (digital.library.unt.edu/ark:/67531/metadc676433/: accessed November 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.