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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 Inelastic Neutron Scattering Investigation of the Phonon Spectra of Dislocated Nb Crystals
Author(s) Sean R. Agnew, Thomas R. Bieler, Matthew B. Stone
On-Site Speaker (Planned) Sean R. Agnew
Abstract Scope Even modest dislocation densities have been shown to have a profound impact upon the phonon-dominated heat transfer of Nb near 2K. At higher temperatures, heat transfer is primarily electron-mediated, so the effect of dislocations on phonon behavior cannot be assessed using measurements of thermal transport alone. At very high dislocation densities, it has been predicted that even single-atom unit cells may exhibit an optical phonon mode. Inelastic neutron spectroscopy (INS) experiments on the Wide Angular-Range Chopper Spectrometer (ARCS) at the Spallation Neutron Source at Oak Ridge National Laboratory are used to examine the phonon spectra of highly pedigreed single crystals of Nb in the highly annealed, uniaxially deformed to moderate strain levels (30%), and heavily rolled conditions at 4K, 50K, and 300K. The results will be discussed in the context of classical observations of thermal transport and modern dislon theory.
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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