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Meeting 2022 TMS Annual Meeting & Exhibition
Symposium Refractory Metals
Presentation Title Design of MoWTaTiZr Refractory Multi-principal Element Alloys
Author(s) Gaoyuan Ouyang, Prashant Singh, Jun Cui, Matthew Kramer, Duane Johnson
On-Site Speaker (Planned) Gaoyuan Ouyang
Abstract Scope Refractory Multi-principal Element Alloys (RMPEA) show high strength at elevated temperatures, surpassing that of Nickel-based superalloys. Recent efforts in RMPEA focus on developing lighter alloys with a combination of strength and ductility. Under the guidance of accurate density-functional theory (DFT) theory, we have studied the phase formation and room temperature (RT) elastic constant of a set of 32 compositions in the Mo-W-Ta-Ti-Zr-(Al,Cr) system. W or Cr addition increased the RT modulus and provided the basis for down selection. Down-selected RMPEA samples show good compressive yield strength (700-900MPa) and ductility (~10% strain) at room temperature. As-casted samples demonstrated good high-temperature yield strength up to 250MPa at 1300C by small punch testing. Our results also showed that the homogenization heat treatment at ~75% of melting point is sufficient to cause phase redistribution and significant grain growth for RMPEA, adversely affecting their mechanical properties.
Proceedings Inclusion? Planned:
Keywords High-Temperature Materials, High-Entropy Alloys, Mechanical Properties


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
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
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
Thermal Stability of Thin Rolled Potassium-doped Tungsten Sheets at Temperatures between 1100 C and 1400 C
Tungsten Grain Optimization and Composite Fabrication for Use in Fusion Reactors

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