Fluorescence spectroscopy analysis of Al–Al2O3 composites with coarse interpenetrating networks
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Fluorescence microprobe spectroscopy was used to characterize the stress fields that develop within an interpenetrating Al–Al2O3 composite resulting from both the thermal expansion mismatch during sample processing, and from an external applied load. The 30 vol% Al–70 vol% Al2O3 composite that was investigated had an aluminum and alumina phase feature size of 50–100 μm. The residual thermal compressive stress measured in the alumina was ∼40–340 MPa. The effect of varying the metal ligament size on the residual stress distribution is discussed. Additionally, the application of an external load caused a non-uniform stress distribution to develop within the alumina regions around the crack-tip, which was attributed to microstructure inhomogeneities. The crack was further extended and the influence of the stress distribution within the alumina regions on the crack extension direction is briefly discussed.
KeywordsResidual Thermal Stress Alumina Phase External Applied Load Thermal Stress Distribution Al2O3 Composite
The authors sincerely thank Prof. Jürgen Rödel of the Technische Universitaet Darmstadt, Germany for use of equipment and assistance during sample preparation. Additionally, the authors would like to thank Lyndal Rutgers of the University of New South Wales for providing the epoxy-alumina sample. This work was supported by the Australian Research Council, the Australian Academy of Science and the Japan Society for the Promotion of Science.
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