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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Refractory Metals 2018
Presentation Title High Ductility in Bulk Polycrystalline Tungsten Produced by Equal Channel Angular Extrusion
Author(s) Zachary S Levin, Karl Ted Hartwig
On-Site Speaker (Planned) Zachary S Levin
Abstract Scope Polycrystalline tungsten of commercial purity was processed by equal channel angular extrusion at low homologues temperatures. A total strain in excess of 4 was imparted via this method, resulting in a bulk material with highly elongated and refined microstructure, {110} texture along the extrusion direction, flexural modulus of ~3GPa, and ductility of 17-23% total elongation. Microstructure was characterized via optical and electron microscopy revealing a highly elongated lamella type structure composed on submicron sized sub grains. Mechanical behavior was evaluated through 3-point bend testing at ambient as well as elevated temperatures. Permitting characterization of temperature effects on ductility, strength and fracture energy, as well as the ductile-to-brittle transition behavior. Through this investigation it was determined that the source of ductility in this highly worked tungsten in due to; Inhibition of crack formation and propagation, by the elongated microstructure, and the favorable {110} texture permitting dislocation mobility under high stress conditions.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Metallurgical Study of Pressure Resistance Welded Molybdenum Based Materials
A Study on the Potential Analogous Rhenium Effect of Manganese in Tungsten-molybdenum Alloys Prepared by Mechanical Alloying
Alloying Behaviour and Properties of Tetragonal Nb5Si3
Assessments of the Mo-Si-X-(B) System for High Temperature Structural Application Potentials
Characteristics of Dynamic Abnormal Grain Growth in Mo and Ta
Effect of Oxide Coating on the Fusion Welding of Molybdenum Tubing
Fabrication of Tungsten Nanopowder by Combustion-based Method
Fracture Toughness Evaluation and Microstructural Characterization of Drawn Tungsten Wires
High Ductility in Bulk Polycrystalline Tungsten Produced by Equal Channel Angular Extrusion
High Temperature Oxidation Behaviors of Refractory Complex Concentrated Alloys (RCCAs)
Mechanical Behavior of a Three-phase Mo-Si-B Alloy Produced by Reaction Synthesis
Microstructure and Mechanical Properties of Cr-Si High-temperature Alloys
On the Design and Selection of Nb In Situ Composites
Opportunities for BCC Refractory-metal-based Superalloys
Oxidation and Creep Behavior of Mo-Si-Ti Alloys
Oxidation Resistance of W Substituted Mo-Si-B
Synthesis of MoC-graphite Composite by High-energy Ball Milling
Tensile Response of Binary Mo-Si Solid Solution Alloys

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