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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Flexible powder production for additive manufacturing of refractory metals and alloys
Author(s) Frauke Hinrichs, Daniel Schliephake, Sascha Seils, Susanne Obert, Alexander Kauffmann, Karin Ratschbacher, Melissa Allen, Martin C. Heilmaier
On-Site Speaker (Planned) Martin C. Heilmaier
Abstract Scope Quality and properties of metal powders are essential for powder metallurgy in general and additive manufacturing (AM) in particular. Thus, several atomization technologies were established meeting the multiple needs of different processing technologies. However, production of refractory metal alloy powder remains challenging due to their high liquidus temperatures (> 2000 C), the formation of brittle intermetallic phases and the reactivity of the constituting elements. In this presentation, powders exemplarily made of Mo-20Si-52.8-Ti (at. pct.) were produced by a novel ultrasonic atomization (UA) process in laboratory scale and compared with an industrial EIGA process. The powders resulting from the two processes were analysed with respect to size distribution, sphericity, microstructure and phase constitution, chemical composition and interstitial impurity content. The properties, quality and quantity of UA perfectly meets the requests for alloy development for powder-based AM while the modified EIGA process allows for upscaling of the amount of alloy powders.
Proceedings Inclusion? Planned:
Keywords Additive Manufacturing, Powder Materials, Process Technology


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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