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  • 1
    Electronic Resource
    Electronic Resource
    Strain determination in thermally-grown alumina scales using fluorescence spectroscopy (1997)
    Springer
    Oxidation of metals 48 (1997), S. 471-495 
    Details
    ISSN: 1573-4889
    Keywords: alumina scales ; stresses ; strains ; fluorescence ; Raman spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract By exploiting the strain dependence of the ruby luminescence line, we have measured room-temperature residual strains in thermally-grown alumina scales. Measurements were made on two alloys Fe-5Cr-28Al and Fe-18Cr 10Al (at.% bal. Fe), oxidized between 300–1300°C. Significantly different levels of strain buildup were observed in scales on these alloys. Results on similar alloys containing a dilute reactive element (RE) are also presented. Scales formed on RE-containing alloys (Zr or Hf) could support significantly higher strains at T ≥ 1000°C. 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 α-Al2O3. It appears that, in the presence of Cr2O3 or Fe2O3, the α-phase of Al2O3 can form at anomalously low temperatures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02153461
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of Edges and Corners on Stresses in Thermally Grown Alumina Scales (2000)
    Springer
    Oxidation of metals 53 (2000), S. 171-191 
    Details
    ISSN: 1573-4889
    Keywords: Alumina scales ; stresses ; strains ; fluorescence ; finite-element calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Residual stress near edges and corners of thermally grown alumina scaleswere investigated. In this study, an edge is the intersection of twoorthogonal flat surfaces and a corner is the intersection of three suchsurfaces. Microfluorescence measurements, performed on alloys withcomposition Fe–28Al–5Cr (at.%, bal. Fe) oxidized at 900°C,showed a large (〉50%) reduction in hydrostatic stress in the vicinity ofedges and corners. Surprisingly, significant stress reduction persists outto distances twenty to fifty times the scale thickness from theedge. Finite-element analysis calculations confirm the experimental resultsand provide a considerably more detailed picture of the stress distributionand its components and show that much of the observed stress reduction nearan edge, is due to plastic deformation of the underlying metal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004543032584
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    Paper (German National Licenses)
    Fulltext
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