|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||Size Effects and Thermal Stability of High-entropy Alloys: Single Crystalline vs. Nanocrystalline
||Yu Zou, Jeffrey M Wheeler, Huan Ma, Roksolana Kozak, Soumyadipta Maiti, Walter Steurer, Ralph Spolenak
|On-Site Speaker (Planned)
A vast majority of studies on high-entropy alloys (HEAs) are focused on their bulk behavior, but how they perform at small length scales – both sample sizes and grain sizes – are still not clear. Here, we study the size-dependent plasticity of two typical HEAs – fcc CrMnFeCoNi and bcc NbMoTaW at both room temperature and elevated temperatures. We show a strong size dependence of strength in fcc CrMnFeCoNi and minor size effect in bcc NbMoTaW at room temperature. More interestingly, we find that these bcc nanocrystalline HEAs exhibit excellent thermal stability for the high-temperature, long-duration conditions (1100 °C for 3 days) and maintain their high yield strengths (above 5 GPa) up to 600 °C. Nanostructured HEAs with remarkably high strength, good ductility, low strain-rate sensitivity, and enhanced thermal stability make them attractive as a new class of structural materials in microscale and nanoscale devices.
||Planned: Supplemental Proceedings volume