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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
Presentation Title Thermomechanical Conversion in Metals: Dislocation Plasticity Model Evaluation of the Taylor-quinney Coefficient
Author(s) Charles Lieou, Curt Bronkhorst
On-Site Speaker (Planned) Charles Lieou
Abstract Scope Using a partitioned-energy thermodynamic framework which assigns energy to that of atomic configurational stored energy of cold work and kinetic-vibrational, we derive an important constraint on the Taylor-Quinney coefficient, which quantifies the fraction of plastic work that is converted into heat during plastic deformation. Associated with the two energy contributions are two separate temperatures -- the ordinary temperature for the thermal energy and the effective temperature for the configurational energy. We show that the Taylor-Quinney coefficient is a function of the thermodynamically defined effective temperature that measures the atomic configurational disorder in the material. Finite-element analysis of recently published experiments on the aluminum alloy 6016-T4, using the thermodynamic dislocation theory (TDT), shows good agreement between theory and experiment for both stress-strain behavior and temporal evolution of the temperature. Our results suggest a value of the differential Taylor-Quinney coefficient which differs between materials and increases with increasing strain.
Proceedings Inclusion? Planned:

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Dislocation-limited Thermal Transport in III-Nitride Materials
Dislocation Drag in Metals: Dependence on Velocity, Temperature, Density, and Crystal Geometry, and Its Effect on Material Response
Do Moving Dislocations Induce Lattice Instabilities?
Inelastic Neutron Scattering Investigation of the Phonon Spectra of Dislocated Nb Crystals
Introduction to Dislons: A Quantized Description of Dislocations with Implications for Thermal and Electrical Transport
Introductory Comments: Phonons, Electrons and Dislons: Exploring the Relationships between Plastic Deformation and Heat
Role of Tantalum Concentration and Processing Temperature on High Strain Rate Phonon Behavior in Copper-tantalum Alloys
Shear Bands, Thermal Profiles and Microstructure Stability in Large-strain Deformation of High Entropy Alloys
The Effects of Heating Rate on Defect Reduction by Recrystallization in Deformed Polycrystal Niobium
Thermal and Strain Rate Effects on Plasticity and Fracture of Gen 3 Steels
Thermo-mechanics of Large Deformation Shear Banding
Thermomechanical Conversion in Metals: Dislocation Plasticity Model Evaluation of the Taylor-quinney Coefficient
Unified Analysis of Temperature Fields Arising from Large Strain Deformation and Friction in Manufacturing Processes

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