|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||L-109: Thermal Properties of Entropy Stabilized Oxides
||Jeffrey Braun, Ashutosh Giri, Zsolt Rak, Mina Lim, Christina Rost, John-Paul Maria, Donald Brenner, Patrick Hopkins
|On-Site Speaker (Planned)
High-entropy alloys (HEAs) have been demonstrated to exhibit exceptional mechanical properties and thermal stability. The emergence of five-component oxides containing high configurational entropy, created by populating a single sublattice with many distinct cations, promises to extend such properties to oxide based systems. In these novel materials, thermal characterization is essential for understanding and predicting performance at elevated temperatures. Moreover, these systems provide a unique opportunity to study the nature of thermal transport and phonon scattering in multicomponent high-entropy materials. In this study, we experimentally investigate the thermal conductivity and heat capacity of thin-film 5- and 6-component oxides using time- and frequency-domain thermoreflectance to reveal a strong reduction in thermal conductivity with inclusion of more components. Finally, we compare experimental results to analytical and computational results to understand the phonon scattering mechanisms driving these findings.
||Planned: Supplemental Proceedings volume