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Design of damage tolerant and crack-free layered ceramics with textured microstructure
Affiliation:1. Department of Materials Science, Lehrstuhl fuer Struktur- und Funktionskeramik, Montanuniversitaet Leoben, Franz Josef Strasse 18, A-8700, Leoben, Austria;2. Department of Materials Science and Engineering, The Pennsylvania State University, 307 Steidle Bldg, University Park, PA, 16802, USA;3. Institute of Solid Mechanics, Mechatronics and Biomechanics, Brno University of Technology, 616 69, Brno, Czech Republic;1. Fachgebiet Keramische Werkstoffe / Chair of Advanced Ceramic Materials, Institut für Werkstoffwissenschaften und -technologien, Fakultät III, Technische Universität Berlin, Hardenbergstr. 40, 10623, Berlin, Germany;2. Division 5.4 Ceramic processing and biomaterials, Bundesanstalt für Materialforschung und -prüfung, Unter den Eichen 44-46, 12203, Berlin, Germany;1. Department of Materials Science, Montanuniversitaet Leoben, Franz Josef Straße 18, A-8700 Leoben, Austria;2. Materials Center Leoben Forschung GmbH, Roseggerstrasse 12, A-8700 Leoben, Austria;1. Engineering Ceramics Department, Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia;2. Biomaterials Laboratory, Faculty of Dentistry, University of Sydney, Sydney Dental Hospital, 2 Chalmers St., Surry Hills, NSW 2010, Australia;1. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK;2. Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, UK;3. Williams Advanced Engineering, Grove, Oxfordshire, OX12 0DQ, UK
Abstract:This work demonstrates damage tolerant behavior of ceramic laminates designed with residual stresses and free of surface edge cracks. Non-periodic architectures were designed by embedding 2 textured alumina (TA) layers between 3 equiaxed alumina-zirconia (AZ) layers. Compressive residual stresses of ∼ 250 MPa were induced in the textured layers. Indentation strength tests showed that textured compressive layers arrested the propagation of cracks. Results were compared to periodic architectures with the same volume ratio of TA and AZ materials. Crack propagation was arrested in both periodic and non-periodic designs; the minimum threshold-strength being higher in the latter. Non-periodic architectures with compressive layers as thin as ∼ 200 μm showed no evidence of surface edge cracks, yet still reached minimum threshold strength values of ∼ 300 MPa. In addition, the textured microstructure promoted crack bifurcation in the thin compressive layers and thus enhanced the damage tolerance of the material.
Keywords:Layered ceramics  Edge crack  Non-periodic textured architecture  Residual stresses  Damage tolerance
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