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Oxidation of Zircaloy-2 studied using a wedge-shaped specimen
Authors:Bevis Hutchinson  Lars Hallstadius
Affiliation:1. Swerea-KIMAB, PO Box 55970, SE-10216 Stockholm, Sweden;2. Westinghouse Electric Sweden, SE-721 63 Västerås, Sweden;1. Centre for Nuclear Engineering and Department of Materials, Imperial College London, London SW7 2AZ, UK;2. Institute of Materials Engineering, Australian Nuclear Science & Technology Organisation, Menai, New South Wales 2234, Australia;3. Nuclear Department, Defence Academy, HMS Sultan, Gosport, Hampshire PO12 3BY, UK;1. Dept. of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden;2. I. Institute of Physics (IA), RWTH Aachen University, 52056 Aachen, Germany;3. Atomic Energy of Canada Ltd, Chalk River Laboratories, Chalk River, Ontario K0J 1J0, Canada;1. Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden;2. Studsvik Nuclear AB, SE-611 82 Nyköping, Sweden;3. Westinghouse Electric Sweden, SE-721 Västerås, Sweden
Abstract:Experiments have been carried out to vary the stress in the oxide layer during oxidation of Zircaloy-2. This was achieved by varying the thickness of the metal substrate, using a specimen with a tapered wedge-shaped cross-section. X-ray diffraction measurements confirmed that the compressive stress level in the oxide was reduced when the metal substrate was thinner. The rate of oxidation was also slower for conditions where the stress was reduced. The results can be interpreted such that transitions in the growth result from sequential cracking of the oxide when sufficient elastic strain energy accumulates and that the cracks then enhance access of oxygen to the metal interface.
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