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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title The influence of impurities on the interfacial chemistry of niobium – alumina high-temperature refractories
Author(s) Michael K. Eusterholz, Torben Boll, Alexander Kauffmann, Reshma Sonkusare, Tilo Zienert, Dirk Endler, Vincent Ott, Anja Weidner, Julian Gebauer, Christos G. Aneziris, Michael Stüber, Martin Heilmaier
On-Site Speaker (Planned) Michael K. Eusterholz
Abstract Scope Composites of coarse-grained refractory metals and refractory α-Al2O3-ceramic offer an outstanding combination of thermomechanical and functional properties, e.g., low shrinkage, excellent resistance to thermal shock, and electrical conductivity. Conventionally sintered composites from technical grade raw materials of α-Al2O3 and Nb include impurity elements and carbides alongside oxides, which further develop after exposure at a typical application temperature of 1500°C to 1800°C. To understand the principles of formation of such phases we investigated α-Al2O3 substrates, which were sputter-coated with Nb as a model system beside the technical grade material. This allows to independently study the influence of various impurity elements at the interface. The chemistry was investigated on different length scales. Backscatter electron imaging and electron backscatter diffraction were used to elucidate the microstructure, while transmission electron microscopy and atom probe tomography advanced the understanding of nano-scale segregation and phase formation at the phase boundary.
Proceedings Inclusion? Planned:
Keywords Composites, High-Temperature Materials,

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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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