| Abstract Scope |
Refractory high entropy alloys are attractive for their mechanical properties at high temperatures. However, the vast compositional space presents a fabrication challenge: how does one quickly create hundreds of compositionally unique samples with bulk-like microstructures? Here we introduce a novel combinatorial method to do so by sputter depositing thick foils that can be processed and mechanically tested as free-standing samples at both low and high temperatures. The foils measure 10 to 200 microns in thickness, and they are annealed and rolled to produce bulk-like grain sizes and textures after removal from their substrates. In this study, we focus on Nb-Ti-Zr and Nb-Ti-Zr-Al alloys, and we screen the many samples based on their chemistry, phase, hardness, ductility, and oxidation. Through this methodology, we hope to find a range of compositions that yield single-phase, body centered cubic materials with strength, ductility, and oxidation resistance. |