High-temperature deformation of Sr(FeCo)1.5Ox ceramics |
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| Affiliation: | 1. Faculty of Materials and Chemical Engineering, Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Pakistan.;2. University of Engineering and Technology Lahore, Pakistan;1. School of Materials Science & Engineering, UNSW Sydney, NSW 2052, Australia;2. Australian Centre for Microscopy & Microanalysis and School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, NSW 2006, Australia;3. Voestalpine Böhler Edelstahl GmbH & Co KG, Mariazellerstraße 25, 8605 Kapfenberg, Austria;4. Department of Microstructure Physics and Alloy Design, Max-Planck-Institute for Iron Research, 40237 Düsseldorf, Germany |
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| Abstract: | Compressive creep of polycrystalline SrFe1.2Co0.3Ox and SrFeCo0.5Ox ceramics has been investigated at 940–1000°C in constant-load and constant-displacement-rate experiments. At low stresses, the stress exponent was ≈1 and the activation energy was ≈110–135 kJ/mol. At higher stresses, a transition occurred and the stress exponent became ≈2.4–3.1 and the activation energy became ≈425–453 kJ/mol. At higher stresses, there was no dependence of the steady-state flow stress on oxygen partial pressure from 10–105 Pa. The creep parameters and scanning and transmission electron microscopy observations of the deformed samples suggested that deformation was controlled by diffusion at low stresses and dislocation glide at high stresses. |
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