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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 Dislocation Drag in Metals: Dependence on Velocity, Temperature, Density, and Crystal Geometry, and Its Effect on Material Response
Author(s) Daniel Blaschke, Leonid Burakovsky, Abigail Hunter, Darby J. Luscher, Dean L. Preston
On-Site Speaker (Planned) Daniel Blaschke
Abstract Scope The mobility of dislocations is an important factor in understanding material strength. Dislocations experience a drag due to their interaction with the crystal structure, the dominating contribution at high stress and temperature being the scattering off phonons due to phonon wind. Yet, the functional dependence of this effect on velocity and other properties has eluded a good theoretical understanding. In this talk we present recent results on dislocation drag from first principles as a function of velocity (resp. stress), temperature, density, and character. We then discuss the impact this newly derived drag coefficient has on the overall material response by presenting selected examples from single crystal plasticity simulations as well as an analytical model of stress as a function of strain rate which takes into account mobile-immobile dislocation intersections as well as dislocation drag from phonon wind.
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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