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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title NanoPhase Separation Sintering in Mo and Mo-W Based Systems
Author(s) Christian Edward Oliver, Christopher Schuh
On-Site Speaker (Planned) Christian Edward Oliver
Abstract Scope Molybdenum and Molybdenum-Tungsten alloys have great potential for future nuclear power and thermal propulsion applications due to their high thermal stability, high thermal conductivity and corrosion resistance. However, Mo and Mo-W based alloys, often produced through a powder metallurgy route, can be difficult to produce, requiring high temperatures or pressure-assisted techniques such as hot isostatic pressing (HIP) to obtain dense parts. Nanophase Separation Sintering (NPSS) offers a way to design Mo-based alloys to exhibit low temperature pressureless sintering, involving the transient formation and resolutionization of second phase necks in the solid state. Experiments demonstrate that the addition of Cr as a sintering aid facilitates NPSS, obtaining near full density at low temperatures without applied pressure. Thermodynamic considerations for composition design for NPSS are also presented and experimentally evaluated.
Proceedings Inclusion? Planned:
Keywords Powder Materials, High-Temperature Materials, Other

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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