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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Grain boundary doping as effective method to improve mechanical properties in ultra-fine grained tungsten
Author(s) Daniel Kiener, Michael Wurmshuber, Simon Doppermann, Stefan Wurster, Severin Jakob, Markus Alfreider, Klemens Schmuck, Rishi Bodlos, Lorenz Romaner, Verena Maier-Kiener, Helmut Clemens
On-Site Speaker (Planned) Daniel Kiener
Abstract Scope Despite its many favorable properties for high-performance applications, tungsten oftentimes cannot tap its full potential due to its inherent brittleness and low formability. Especially ultra-fine grained tungsten, a promising candidate for nuclear fusion applications due to its excellent performance in irradiative environments, suffers from a low-energy intercrystalline fracture. A key factor to reinforce these weak grain boundaries is to increase the grain boundary cohesion, e.g. using doping elements. In this work, several ultra-fine grained tungsten samples, doped with elements that were identified to strengthen grain boundaries via density functional theory, were produced from powders using severe plastic deformation. Extensive microstructural and micro-mechanical characterization confirmed that hafnium and boron can simultaneously increase strength, ductility and toughness of tungsten. Furthermore, an additional heat treatment of the boron-doped sample allows for more grain boundary segregation, which improves the mechanical properties and overall damage tolerance even further, suggesting a pathway to adaptive tungsten alloys.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Nuclear Materials, Mechanical Properties

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Bending Creep Deformation of ODS MoLa with 0.6 vs 1.1 wt.%La
Design of BCC high-entropy alloys with low neutron absorption cross-section
Design of MoWTaTiZr Refractory Multi-principal Element Alloys
Development of Heat-Treatable Crss-Cr3Si-based Alloys: Microstructure, Oxidation, and Creep
Development of novel chromium-superalloys strengthened by B2 intermetallic precipitates
Effect of heating rate and substrate on the oxidation behavior of hafnium aluminum diboride thin films
Flexible powder production for additive manufacturing of refractory metals and alloys
Flow behavior and associated microstructures of niobium at 1200 to 1500°C
Grain boundary doping as effective method to improve mechanical properties in ultra-fine grained tungsten
Grain Boundary Segregation Engineering in Technically Pure Molybdenum Examined via Three-point Bending Tests
High-throughput Engineering of Oxidation Behavior in complex refectory alloys
Hydrogen Reduction of Cobalt(II,III) oxide to make sub-micron and micron size cobalt metal powder for WC-Co synthesis
NanoPhase Separation Sintering in Mo and Mo-W Based Systems
Nanostructured tungsten alloys for nuclear fusion
Oxidation behavior of Mo-Si-B-Al alloys at elevated temperature
Platinum-based superalloys: Combating high temperatures and aggressive environments
Realizing sub-micron tungsten and tungsten composite microstructures via deformable punch spark plasma sintering
Refractory High Entropy Alloys for Applications in Extreme Environments
Studies on the phase formation of cobalt contacted with zinc vapour
Sustainability-based Selection of Materials for Refractory High Entropy Alloys
Tensile Properties of Molybdenum & ODS MoLa Sheet at Elevated Temperatures
The influence of impurities on the interfacial chemistry of niobium – alumina high-temperature refractories
The oxidation behavior of the eutectic alloy Mo-20Si-52,8Ti in dry and wet atmospheres
Thermal stability of thin rolled potassium-doped tungsten sheets at temperatures between 1100 C and 1400 C
Thermodynamic assessment of the V-Ti-B system
Tungsten grain optimization and composite fabrication for use in fusion reactors

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