Thermal microstress measurements in Al2O3/SiC nanocomposites by Cr3+ fluorescence microscopy |
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| Affiliation: | 1. Virginia Commonwealth University, USA;2. Department of Psychiatry and Psychotherapy, Heinrich-Heine University, Germany;3. Global Mental Health Program, Columbia University Medical Center, USA;4. New York State Psychiatric Institute, USA;5. Mississippi State University, USA;6. All India Institute of Medical Sciences, India;7. World Health Organization, Switzerland;1. Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research (IEK-1), D-52425 Jülich, Germany;2. Jülich-Aachen Research Alliance, JARA-Energy, Germany;3. Institute for Applied Materials, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany;4. Helmholtz-Institute Münster, c/o Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany;1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran, 1684613114, Iran;2. Department of Bioengineering, School of Engineering of São Carlos, University of São Paulo, São Carlos, SP, 13.566-590, Brazil;3. Department of Materials Engineering, Center for Research, Technology and Education in Vitreous Materials, Federal University of São Carlos, São Carlos, SP, 13.565-905, Brazil;1. College of Energy, Xiamen University, Xiamen 361005, Fujian, China;2. Key Laboratory of High-valued Conversion Technology of Agricultural Biomass, Xiamen 361005, Fujian, China;3. Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, Xiamen 361005, Fujian, China;4. Henan Key Lab of Biomass Energy, Zhengzhou 450008, Henan, China;5. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, Southeast University, Nanjing 210096, Jiangsu, China;1. Department of Geosciences, University of Padua, Via G. Gradenigo 6, 35131 Padua, Italy;2. Department of Earth and Environmental Sciences, University of Pavia, Via A. Ferrata, 1, 27100 Pavia, Italy;3. Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany;4. School of Geographical and Earth Sciences, University of Glasgow, Glasgow, G12 8QQ, UK;5. Swiss Light Source, Paul Scherrer Institut, 5232 Villigen, Switzerland |
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| Abstract: | Alumina/SiC ‘nanocomposites’ show significant property improvements compared with pure alumina. The improvements are thought to stem at least in part from the microstresses caused by the thermal expansion mismatch between alumina and SiC. These microstresses have been measured previously by neutron and X-Ray diffraction. This paper reports stress measurements using Cr3+ fluorescence microscopy of the alumina matrix. The results show that although fluorescence microscopy is less powerful than the diffraction techniques in terms of the range of information provided, it does provide an alternative method of measuring subsurface microstresses in these materials which is quicker, cheaper and higher in spatial resolution. |
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