| Abstract Scope |
Refractory metals and alloys are critical for structural performance in extreme environments, including propulsion and fusion energy systems. While conventional powder metallurgy remains effective, additive manufacturing (AM) enables complex geometries and offers potential cost savings over subtractive methods. In this study, we develop AM process parameters for key refractory alloys (e.g., C103, Ta-W, W-Re), evaluate their high-temperature tensile behavior, and investigate processing-structure-property relationships. Custom sub-scale tensile specimens, specifically designed for laser powder bed fusion and powder-blown directed energy deposition, were tested at temperatures up to 2000°C using direct resistive heating in a Gleeble system. Special attention is given to the role of heating rate on mechanical response, comparing rapid heating with slower, furnace-based conditions. Ongoing electron microscopy studies are examining how grain morphology and recrystallization evolve under different thermomechanical testing conditions, and how these microstructural changes affect material performance at high temperatures. |