|About this Abstract
||MS&T22: Materials Science & Technology
||High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond III
||High-temperature Oxidation and Mechanical Behavior of Ta-Ti-Cr Concentrated Refractory Alloys
||Noah J. Welch, Maria J Quintana, Todd M Butler, Peter C Collins
|On-Site Speaker (Planned)
||Noah J. Welch
There is an ever-growing need for high temperature materials that can outperform Ni-base superalloys in extreme environments (>1000°C-1150°C). While dilute refractory alloys generally exhibit suitable mechanical strength at much higher temperatures, their oxidation resistance is severely lacking. However, concentrated refractory alloys have a tendency to form favorable complex oxides that improve oxidation resistance. The oxidation behavior of four Ta-Ti-Cr alloys (TaTiCr, Ta4Ti3Cr, Ta2TiCr, and Ta4TiCr3) have been investigated to elucidate the role of constituent concentration on microstructures and resulting oxidation performance and mechanical behavior. These four alloys have been tested for 24 hours at 1200°C and show drastically different oxidation behaviors, with the TaTiCr alloy exhibiting superior oxidation resistance. These alloys were also mechanically tested (compression) in the 20-1200°C range to understand the high-temperature performance in atmospheres containing oxygen.