Creep behaviour of alumina/YAG nanocomposites obtained by a colloidal processing route |
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| Affiliation: | 1. INCAR-CSIC, C/Francisco Pintado Fe 26, La Corredoria, 33011 Oviedo, Spain;2. ICMM-CSIC, Campus UAM, Cantoblanco, 28049 Madrid, Spain;1. Department of Engineering “E. Ferrari”, University of Modena and Reggio Emilia, Via Vignolese 905, 41125 Modena, Italy;1. Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3. General Institute for Nonferrous Metals, Beijing 100088, China;1. Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, Košice, Slovakia;2. Institute of Inorganic Chemistry, Slovak Academy of Sciences, Dúbravská Cesta 9, Bratislava, Slovakia;1. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;2. School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao 266033, China;3. College of Environmental Science and Engineering, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China;4. Sanlihe Subdistrict Office, Jiaozhou, Qingdao 266033, China;1. Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, I-50121 Firenze, Italy;2. CNR – Istituto di Geoscienze e Georisorse, Sezione di Firenze, Via La Pira 4, I-50121 Firenze, Italy;3. Department of Petrology, Geological Faculty, Moscow State University, Leninskie Gory, 119234, Moscow, Russia;4. Geodynamics Research Center, Ehime University, Matsuyama 790-8577, Japan;5. Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo 152-8550, Japan;1. Centre of Advanced Structural Ceramics & Department of Materials, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;2. Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK;3. Naval Research Laboratory, Washington, D.C. 20375, USA |
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| Abstract: | The high temperature creep behaviour (1200–1400 °C and 30–250 MPa) of high-purity alumina (A) and an alumina/YAG nanocomposite (AY) prepared by using a colloidal processing route has been studied. Creep parameters were correlated with microstructural features in order to determine the dominant creep mechanisms in both materials.It was found that the creep rate value of AY was 1 order of magnitude lower than the one of undoped alumina A. The creep mechanism for AY was found to be lattice diffusion (Nabarro–Herring) compared to a combination of grain boundary (Coble) and lattice diffusion for A. When the slow crack growth region of both materials was compared, a significant improvement was observed, i.e. the slow crack growth region of alumina shifted to nearly 2.5 times the stresses applied for AY at the temperatures of 1200, 1300 and 1400 °C. |
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