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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


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