|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||High Entropy Alloys V
||L-104: Microstructural Investigations of a Nanocrystalline TiZrHfNbTa High-entropy Alloy
||Benjamin Schuh, Jean-Philippe Couzinié, Verena Maier-Kiener, Bernhard Völker, Anton Hohenwarter
|On-Site Speaker (Planned)
An equiatomic TiZrHfNbTa high-entropy alloy was subjected to severe plastic deformation using high-pressure torsion, leading to a substantial refinement of the microstructure and a grain size well below 100 nm. Isochronal heat treatments performed for 1 hour resulted in a significant hardness increase from approximately 420 HV1 for the as-processed state to ~ 530 HV1 for an annealing temperature of 500°C, while for higher temperatures the hardness starts to decrease due to the onset of grain growth. In order to clarify this unexpected annealing response comprehensive analysis of selected microstructural states was performed utilizing electron microscopy as well as mechanical testing such as nanoindentation and compression testing to gain further information on microstructure-property relationships. The changes in mechanical properties could be related to the formation of new phases during low temperature annealing, therefore the obtained results give new valuable insights into the phase-stability of the TiZrHfNbTa high-entropy alloy.
||Planned: Supplemental Proceedings volume