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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Effect of heating rate and substrate on the oxidation behavior of hafnium aluminum diboride thin films
Author(s) Samyukta Shrivastav, Dana Yun, Carly Romnes, Kinsey Canova, John R Abelson, Jessica Krogstad
On-Site Speaker (Planned) Samyukta Shrivastav
Abstract Scope The oxidation resistance of hafnium diboride in high temperature applications is attributed to a liquid boria phase, which can be volatile depending on temperature and pressure. This volatility poses a problem for thin films, as it may lead to spallation and consumption of the film. Here, aluminum is alloyed with hafnium diboride via a low-temperature CVD process to enable the formation of a protective aluminum oxide and suppress boria volatilization. We show that the oxidation behavior of HfAlBx thin films is strongly dependent on heating rate and substrate interaction. The thickness, phase, and composition of the oxide formed were determined using HRTEM and SEM. In cases that did not develop a continuous passivating oxide, complete oxidation of films was observed. Films on sapphire gave rise to the formation of nano-whiskers of Al4B2O9 with traces of alumina, while films deposited on silicon resulted in the formation of an amorphous silica layer
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, Thin Films and Interfaces, Characterization

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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