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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Realizing sub-micron tungsten and tungsten composite microstructures via deformable punch spark plasma sintering
Author(s) Nachiket Shah, Nathan J Madden, Sergei Zvenigorodsky, Zachariah Koyn, Jessica A Krogstad
On-Site Speaker (Planned) Nachiket Shah
Abstract Scope Tungsten is an attractive refractory material for future fusion reactor applications because of its high melting point, good thermal conductivity, and high sputter threshold. While dense polycrystalline tungsten has been fabricated before using powder processing methods, the potential for finer grain structures possible via a lower temperature processing regime has not been fully explored. In this work, a modified high pressure die stack setup was used in a spark plasma sintering (SPS) machine to manufacture high density, sub-micron grained pure tungsten samples. Processing parameters such as pressure and hold temperature were systematically varied to observe changes in microstructure and mechanical properties. Additional compositional regimes were explored by incorporating composite-forming carbide additives. Our results show that sintered tungsten samples with reasonably high densities (>80%) and high microhardness values (up to 387 kgf/mm2) can be fabricated at pressures between 500-750MPa and at temperatures under a third of its melting point (<0.3Tm).
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Powder 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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