2016
DOI: 10.1016/j.actamat.2016.01.020
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Quantitative mapping of stress heterogeneity in polycrystalline alumina using hyperspectral fluorescence microscopy

Abstract: The microstructurally-induced heterogeneous stress fields arising in a series of Cr-doped polycrystalline alumina materials are mapped with sub-micrometer sub-grain size resolution using fluorescence microscopy. Analysis of the hyperspectral data sets generated during imaging enabled both the amplitude and position of the characteristic Cr R1 fluorescence peak to be determined at every pixel in an image. The peak amplitude information was used to segment the images into individual grains and grain boundary reg… Show more

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Cited by 16 publications
(41 citation statements)
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References 69 publications
(162 reference statements)
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“…Hence, the linear variation of shift with applied stress (up to a few hundred megapascals; one unverified exception) and the numerical agreement with the non-polycrystal coefficient determinations surveyed above further support the observations. It is noted that the applied stress range of the polycrystal experiments was about an order of magnitude less than the single-crystal or fiber experiments (previous sections) and comparable to the intrinsic microstructural stresses expected and observed in bulk polycrystals [38][39][40][41][42][58][59][60][61][62][63][64][65][66][67]. Table 3 gives the first author, year published, citation, R-line coefficients (R1 or R2), and notes for original works that (experimentally) determined the temperature coefficients β (1) and β (2) ; see Eq.…”
Section: Bulk Polycrystal Testsmentioning
confidence: 90%
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“…Hence, the linear variation of shift with applied stress (up to a few hundred megapascals; one unverified exception) and the numerical agreement with the non-polycrystal coefficient determinations surveyed above further support the observations. It is noted that the applied stress range of the polycrystal experiments was about an order of magnitude less than the single-crystal or fiber experiments (previous sections) and comparable to the intrinsic microstructural stresses expected and observed in bulk polycrystals [38][39][40][41][42][58][59][60][61][62][63][64][65][66][67]. Table 3 gives the first author, year published, citation, R-line coefficients (R1 or R2), and notes for original works that (experimentally) determined the temperature coefficients β (1) and β (2) ; see Eq.…”
Section: Bulk Polycrystal Testsmentioning
confidence: 90%
“…where is the Cr composition given by the mass fraction (not percentage [139]) of Cr in the Al2O3:Cr structure [66]. is positive, such that fluorescence energy increases with Cr content.…”
Section: Temperature and Compositionmentioning
confidence: 99%
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