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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Phonons, Electrons and Dislons: Exploring the Relationships Between Plastic Deformation and Heat
Sponsorship TMS Materials Processing and Manufacturing Division
TMS: Shaping and Forming Committee
Organizer(s) Aashish Rohatgi, Pacific Northwest National Laboratory
Sean R. Agnew, University of Virginia
Thomas R. Bieler, Michigan State University
Scope While the simple fact that plastic deformation efficiently converts mechanical energy (work) into heat is well known, many questions regarding this (and related) phenomenon are still unanswered or are not universally accepted. For example, what factors (composition, microstructure, etc.) determine the fraction of work which is converted into heat, what are the mechanisms of converting deformation to heat, and what is the role of “phonon radiation” of dislocations as they move at high velocities? Numerous research topics are affected since these heating effects can lead to helpful or harmful plastic instabilities during high-strain-rate deformation (Hopkinson bar tests, plate-impact tests, shock-deformation), shear-banding, friction stir welding/processing, machining, ball milling, etc. The topic of heat generation is typically addressed by using thermocouples or infra-red cameras to record the temperature rise associated with a corresponding plastic strain, but usually, there is less clarity or discussion around the mechanisms of heat generation. In conditions where visual or contact access is not possible, indirect methods to infer heating history or simulations are required, which includes assessment of degrees of dynamic recovery or recrystallization as an indicator of local heating history. On the flip-side, it is becoming increasingly clear that the mere presence of dislocations in the lattice can be used to engineer the thermal and electrical transport of materials relevant to applications as diverse as thermoelectrics, optoelectronics, topological insulators, and superconductors. An emergent theoretical construct known as a “dislon” has recently been introduced, which promises to explain such diverse manifestations of the interactions between phonons, electrons and dislocations. Therefore, this symposium aims to provide a forum for reporting experimental, computational, and theoretical methods to understand both, heat generation and heat transfer in materials, through the interactions between phonons, electrons and dislons. Research exploring the fundamental physics, in association with experimental validation, is also encouraged.
Abstracts Due 07/20/2020
Proceedings Plan Planned:

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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