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Effect of grain size on the static and dynamic mechanical properties of magnesium aluminate spinel (MgAl2O4)
Affiliation:1. Department of Materials Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 8410501, Israel;2. Department of Mechanical Engineering, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 8410501, Israel;1. Department of Molecular Sciences and Nanosystems and Centro di Microscopia Elettronica “Giovanni Stevanato”, Università Ca’ Foscari di Venezia, via Torino 155/B, 30172 Venezia, Mestre, Italy;2. Kyoto Institute of Technology and Research Institute for Nanoscience, Sakyo-ku, Matsugasaki 606-8585, Kyoto, Japan;3. Department of Condensed Matter Physics, Universidad de Sevilla, Avda. Reina Mercedes, 41012 Sevilla, Spain;4. ISTEC, Institute of Science and Technology for Ceramics, via Granarolo 64, I-48018 Faenza, Ravenna, Italy;1. Department of Materials Science and Engineering & NEAT ORU, University of California, Davis, CA 95616, USA;2. Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA;1. G.G. Devyatykh Institute of Chemistry of High-Purity Substances RAS, Nizhny Novgorod, Russia;2. N.I. Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia;3. Institute of Applied Physics RAS, Nizhny Novgorod, Russia;1. Joint Glass Centre of the IIC SAS, TnUAD, FChPT STU, Študentská 2, 911 50 Trenčín, Slovakia;2. FunGlass, A. Dubček University of Trenčín, Študentská 2, 911 50 Trenčín, Slovakia;3. RHP-Technology GmbH, Forschungs-und Technologiezentrum, 2444 Seibersdorf, Austria;4. Department of Inorganic and Physical Chemistry, Gent University, Krijgslaan 281 (53), 9000 Gent, Belgium;1. Optical Research and Photonics Unit, CDTA, Ferhat Abbas University Setif 1, Algeria;2. Emerging Materials Research Unit, Ferhat Abbas University Setif 1, Algeria;3. Optics and Precision Mechanics Institute, Ferhat Abbas University Setif 1, Algeria;4. Mateis Laboratory, INSA Lyon, France
Abstract:Samples of transparent polycrystalline spinel with average grain size varying from 0.14 to 170 μm were prepared by different sintering approaches. The effect of grain size on the flexural strength, hardness and Hugoniot elastic limit (impact loading) was investigated. It was found that values of hardness divided by three for samples with grain size in the 0.14–15 μm range were almost equal to the dynamic yield strength values, estimated based on the Hugoniot elastic limit. This led to the assumption that the onset of inelastic deformation at the Hugoniot elastic limit was brittle rather than ductile. The observed departure of the dynamic yield strength from the hardness divided by three value for ceramics with grain size >15 μm was associated with either impact-induced shear banding or twinning. The feasibility of such banding/twinning intervention in initiating inelastic deformation in the spinel is supported by the values of apparent Hall-Petch coefficients in the corresponding grain size domains.
Keywords:Dynamic mechanical properties  Grain size  Hall-Petch  Magnesium aluminate spinel  Static mechanical properties
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