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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Refractory High Entropy Alloys for Applications in Extreme Environments
Author(s) Osman El-Atwani, Hi Vo, Matheus Tunes, Andrew Alvarado, Kevin Baldwin, Koray Iroc, Eda Aydogan, Stuart Maloy, Enrique Martinez
On-Site Speaker (Planned) Osman El-Atwani
Abstract Scope In the quest of new materials that can withstand severe irradiation and mechanical extremes for advanced applications (eg. fission reactors, fusion devices, space applications, etc.), design, prediction and control of advanced materials beyond current material designs become a paramount goal. W-based refractory high entropy alloys (HEA) have been recently developed in the context of high temperature applications. Here, we present thermal stability, mechanical properties and irradiation resistance experiments on several simulation (CALPHAD, DFT and Cluster Expansion) guided compositions of W-based refractory HEAs. In-situ TEM-annealing experiments are performed on different compositions of the HEAs and the results are compared with CALPHAD simulations and the enthalpies of mixing determined through DFT and Cluster Expansion methodologies. Ductility and strength are assessed, and in-situ TEM-irradiation and implantation experiments are performed and discussed. This work constructs a timely and urgent pathway to optimize the properties of these HEAs for different current and future applications.
Proceedings Inclusion? Planned:
Keywords High-Entropy Alloys, Nuclear Materials, High-Temperature Materials


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Design of BCC High-entropy Alloys with Low Neutron Absorption Cross-section
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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
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
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
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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
Thermal Stability of Thin Rolled Potassium-doped Tungsten Sheets at Temperatures between 1100 C and 1400 C
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