| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Piot, David
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (20/20 displayed)
- 2024Substructure heterogeneity during hot deformation of ferritic stainless steels - Experimental characterization and discussion assisted by a mean-field modelcitations
- 2024Nucleation of recrystallization: A new approach to consider the evolution of the substructure in the system
- 2021An Attempt to Assess Recovery/Recrystallization Kinetics in Tungsten at High Temperature Using Statistical Nanoindentation Analysiscitations
- 2019A dissipation potential approach to describe flow instability in alloys during hot deformation
- 2019A flow instability criterion for alloys during hot deformationcitations
- 2018A semitopological mean-field model of discontinuous dynamic recrystallization ; A semitopological mean-field model of discontinuous dynamic recrystallization: Toward a correct and rapid prediction of grain-size distributioncitations
- 2013Modeling Grain Boundary Motion and Dynamic Recrystallization in Pure Metalscitations
- 2013Mechanical modeling of macroscopic behavior for anisotropic and heterogeneous metal alloyscitations
- 2012Hot Deformation and Dynamic Recrystallization of the Beta Phase in Titanium Alloys 7th International Conference on Processing and Manufacturing of Advanced Materials - Quebec City, CANADA - AUG 01-05, 2011; THERMEC 2011, PTS 1-4citations
- 2010Microtexture tracking in hot-deformed polycrystalline aluminium: Experimental resultscitations
- 2010Integrated modelling of precipitation during friction stir welding of 2024-T3 aluminium alloycitations
- 2010Microtexture tracking in hot-deformed polycrystalline aluminium: Comparison with simulationscitations
- 2010Rheological Behavior of Pure Binary Ni-Nb Model Alloys ; 6th International Conference on Processing and Manufacturing of Advanced Materials ; AUG 25-29, 2009 ; Berlin, GERMANYcitations
- 2009DEFORMATION MICROSTRUCTURE AND TEXTURE EVOLUTION OF {110}<112> Al-0.3wt.%Mn SINGLE CRYSTALS COMPRESSED IN A CHANNEL-DIE
- 2008MICROSTRUCTURAL MODELING OF COLD CREEP/FATIGUE IN NEAR ALPHA TITANIUM ALLOYS USING CELLULAR AUTOMATA METHOD
- 2007Microtexture Development and Flow Stress Saturation during Triaxial Forging of an Al-3Mg-Sc(Zr) Alloy
- 2006Texture and microtexture development in an Al–3Mg–Sc(Zr) alloy deformed by triaxial forgingcitations
- 2005Hot plane strain compression testing of aluminum alloys by channel-die compressioncitations
- 2005A Rapid Deformation Texture Model Incorporating Grain Interactions: Application to Aluminium Hot Rolling Texturescitations
- 2004A rapid deformation texture model incorporating grain interactionscitations
Places of action
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article
A flow instability criterion for alloys during hot deformation
Abstract
<p>Flow instability is an intrinsic behavior of materials, especially during hot deformation, and it will be intensified and propagate internal defects, and finally lead to various damages in the significant perturbation. Some phenomenological models in the literature could present the flow instability behavior, but not available for describing the microstructure changes. To overcome this problem, we introduce a dissipation potential as a function of the plastic strain rate, the dislocation density rate, and the heat transfer rate, 퐷(휺̇<sub>푝</sub>, 휌̇<sub>푑is</sub>, 풒; 휀, 휌<sub>푑is</sub>, 휃), coupled with strain, dislocation density, and temperature as the boundary condition to record the microstructure evolution and describe the flow instability. In this function, the stored energy rate marks the dislocation density evolution, i.e., the transient microstructure changes, and one parameter 휂<sub>푀</sub>, is introduced to evaluate the efficiency of metallurgy. And the flow instability criterion is derived from the principles of maximum dissipation (or maximum entropy production rate) and orthogonality proposed by HANS ZIEGLER. We obtain the necessary conditions of the flow instability are that the dissipation potential is with entirely positive values due to the large plasticity, and the dissipation potential 퐷(휺̇<sub>푝</sub>, 휌̇<sub>푑is</sub>, 풒; 휀, 휌<sub>푑is</sub>,휃) is convex, i.e., the associated Hessian matrix is semi-positive. In this work, the function was applied to describe the behavior of Ti6Al4V during hot deformation, and a Kocks-Mecking type model was used to describe the flow stresses as well.</p>