Power-law and exponential creep in class M materials: discrepancies in experimental observations and implications for creep modeling |
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| Affiliation: | 1. ITER Organization, Route de Vinon-sur-Verdon, CS 90 046, 13067 St. Paul Lez Durance Cedex, France;2. Assystem EOS, 117 rue Jacquard, 84120 Pertuis, France;3. Sogeti High Tech, RE2, 180 rue René Descartes, Le Millenium – Bat C, 13857 Aix en Provence, France;4. SOM Calcul – Groupe ORTEC, 121 ancien Chemin de Cassis – Immeuble Grand Pré, 13009 Marseille, France;1. School of Information Science and Technology, Dalian Maritime University, Linghai Road 1, Dalian, China;2. School of Information Science and Technology, Tokai University, 4-1-1 Kitakaname, Hiratsuka 259-1292, Japan;1. CCFE, Culham Science Centre, Abingdon, Oxon, OX14 3DB, UK;2. Max Planck Institute for Plasma Physics, Boltzmann Str. 2, 85748 Garching, Germany;1. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford, Oxfordshire, OX1 3AN, UK;2. Department of Materials, Imperial College London, Royal School of Mines, Exhibition Road, London SW7 2AZ, UK;3. Department of Materials, University of Oxford, Parks Road, Oxford, Oxfordshire, OX1 3PH, UK;1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing, China;2. College of Resources and Environmental Science, Chongqing University, Chongqing, China;3. High Pressure and Temperature Laboratory, Department of Earth Sciences, Utrecht University, Utrecht, The Netherlands;4. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei, China;5. Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan |
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| Abstract: | This paper discusses our current understanding of the processes thought to be dominant in the exponential creep regime as well as the implications for creep modeling relating to both power-law and exponential creep regions. The significance and implications of creep controlled by vacancy diffusion along dislocation cores are discussed. It is pointed out that creep substructures, other than subgrains, have been reported in the literature, and a bifurcation diagram is presented to demonstrate how this evolution can occur from an initially homogeneous dislocation substructure. The use of nonlinear dislocation dynamics in creep modeling is advocated to rationalize the observed diversity in the creep substructures. It is demonstrated that the dislocation substructure evolution models can be coupled with a viscoplastic model through the volume fractions of the ‘hard’ and ‘soft’ phases. This coupling is shown to lead to the stress-subgrain size relationship in a simple and a natural way. |
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