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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title The oxidation behavior of the eutectic alloy Mo-20Si-52,8Ti in dry and wet atmospheres
Author(s) Matthias Weber, Bronislava Gorr, Hans-Jürgen Christ, Susanne Obert, Aditya Srinivasan Tirunilai, Alexander Kauffmann, Martin Heilmaier
On-Site Speaker (Planned) Matthias Weber
Abstract Scope Mo-silicide based alloys with high Ti concentrations are a new class of high temperature materials with promising properties. The good oxidation resistance relies on the formation of a duplex titania-silica layer. In this contribution, the effect of water vapor on the formation and growth of oxide scales on the alloy Mo-20Si-52.8Ti (at. %) at 1200°C is investigated. The oxidation kinetics increases in wet atmospheres compared to that in dry air. To explore whether the outer TiO2 layer can diminish the detrimental effect of water vapor, this scale was removed which causes a dramatic acceleration of the scale growth kinetics in the wet environment. It is discussed that water vapor may increase the concentration of oxygen vacancies in titania leading to faster inward diffusion of oxygen. Further, the diffusion of water in silica is substantially higher than that of oxygen obviously accounting for the higher oxidation rates in wet atmospheres.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Environmental Effects, 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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