About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
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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: |