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Meeting 2023 TMS Annual Meeting & Exhibition
Symposium Environmental Degradation of Multiple Principal Component Materials
Presentation Title High Temperature Oxidation of NbTiZr and HfNbTaTiZr RMPEAs
Author(s) Charlie Brandenburg, David Beaudry, Elaf Anber, Jean-Philippe Couzinie, Loic Perriere, Mitra Taheri, Elizabeth J Opila
On-Site Speaker (Planned) Charlie Brandenburg
Abstract Scope Oxidation mechanisms of refractory multiple principal element alloys (RMPEAs) and methods for mitigating rapid oxidation rates remains a challenge. The oxidation kinetics of equimolar NbTiZr and HfNbTaTiZr were studied by thermogravimetric analysis at 1050°C in 1% oxygen (balance argon). The oxidation kinetics of NbTiZr were non-parabolic but slowed with time, and the sample fully oxidized within the 20-hour TGA experiment. The oxidation kinetics of HfNbTaTiZr were approximately parabolic, and the specific weight gain was significantly less than that of NbTiZr. XRD analysis of the oxide scales revealed TiO2, TiNb2O7, and Zr6Nb2O17 structures in all samples. SEM-EDS of sample cross sections showed initial phase separation of NbTiZr into Nb- and Zr-rich regions, and HfNbTaTiZr into (Nb, Ta) and (Hf, Zr)-rich regions. As oxidation progressed, Ti also precipitated out of solution. Possible explanations for reduced oxidation rates in the HfNbTaTiZr system are explored.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, High-Entropy Alloys, Other

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A High, Medium to Low Throughput Study of Aqueous Passivation in FeCoNi–(Crx–Aly) Alloys across Classical Cr Threshold Concentration
Atomistic Exploration of Light-weight Refractory High Entropy Alloys by Promoting Short-range Chemical Order Using a Machine Learning Potential
B-1: Concentration Effect of Tellurium on the Corrosion and Mechanical Properties of 304 Stainless Steel in Molten FLiNaK Salt
Cold Working Enhanced Thermal Stability of Native Oxide Solar Absorbers on FeMnNiAlCr High Entropy Alloys for Concentrated Solar Power System
Conditions for Exclusive External Scale Formation in the High Temperature Oxidation of Alloys
Corrosion and Mechanical Behavior of High-Entropy Alloys
Corrosion Behavior of High-Entropy Alloys
Determining Elemental Distributions across Thin Corrosion Films on Multi-principal Element Alloys via Atom Probe Tomography
Effect of Niobium Addition on the Passivity and Corrosion Resistance of TiHfZrNbx High-entropy Alloys in a Hanks’ Solution
Effect of the Chemical Composition on the Formation of Compact (Cr,Ta,Ti)O2 Scales on Refractory High-entropy Alloys (RHEAs) within the Ta-Mo-Cr-Ti-Al System
Effects of pH on the Corrosion and Tribocorrosion Behavior of Al0.1CrCoFeNi High Entropy Alloys in 0.6 M NaCl Solution
Elemental Effects on Oxidation Kinetics of Refractory High Entropy Alloys
Enabling Oxidation-resistant Refractory Complex, Concentrated Alloys via a Machine Learning for Accelerated Materials Discovery Framework
Flow and Steam Enhanced Degradation of Once Through Steam Generation Piping Steels
High-Throughput Computation of Short-Range Order Types in MPEA Alloys
High Temperature Oxidation of CoNiFeMnCr High Entropy Alloys Reinforced by MC-carbides
High Temperature Oxidation of NbTiZr and HfNbTaTiZr RMPEAs
Hot Corrosion of TP347H in Coal Ash – an Electrochemical Noise Investigation
How Alloying Elements Affect Passivation and Dissolution in the NiCrFeCoMn System: New Insights Using Element-resolved Electrochemistry
Hydrogen Diffusion towards Notch Tips in Zirconium Alloys
Influence of Hydrogen on the Low Cycle Fatigue Behavior of the Equiatomic CrMnFeCoNi High Entropy Alloy
Intermediate and High-Temperature Oxidation Behavior of an Equiatomic CrTaTi Alloy from 800°C to 1400°C
Investigation of Spinel Phase Formation on Ni-doped FeCrAl Alloy in Multiple Environments
Limitations of Equiatomic Refractory High Entropy Alloys: Role of Reactive Elements in Al-containing HfNbTaTiZr
Modeling Element-resolved Dissolution of Compositionally Complex Alloys in Aqueous Environments
Modelling the Interactions of Zirconium Hydrides
Novel Refractory Metal-based High Entropy Silicide-Borides and their Oxidation at 1100°C
On the High-temperature Oxidation of Complex Concentrated Alloys FeAlCrNixVy
Passivation and Corrosion Resistance of Compositionally Complex Alloys: Effects of Cr
Role of Surface Deformation on the High-Temperature Oxidation Response of FeNiCr-based HEAs
Tailoring Oxidation Behavior of MPEAs Through Microstructural Modification
The Hydrogen Charging-induced Surface Degradation on High-entropy Alloys Studied via In-situ Techniques
Tuning of Hierarchical Oxide Evolution in NbTiZr-based RMPEAs
Understanding Elemental Effects on the Accelerated Corrosion of FeCrAl Alloy System in Steam Environments

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