|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Alloy Behavior and Design Across Length-Scales: An SMD Symposium Honoring Easo George
||Utilizing Nanoprecipitates to Modulate Phase Transformation, Strength, and Ductility of HEAs
||Ying Yang, Eva Zarkadoula, Easo George
|On-Site Speaker (Planned)
Solid solution high-entropy alloys (HEAs) with the face-centered cubic (fcc) structure can exhibit extensive tensile ductility and excellent toughness, but their room-temperature strength tends to be low. To increase strength, obstacles to dislocation motion such as precipitates are typically added. However, with few exceptions, they tend to embrittle the materials. Precipitates, in addition to spatially confining dislocations and increasing strength, can also retard phase transformation. In this presentation, we will demonstrate a strategy that utilizes computational thermodynamics and kinetics to control nanoprecipitate characteristics, thereby to independently tune both phenomena. The precipitates, by synergistically modulating the strength and transformation of the HEA matrix, produce alloys with improved strength and ductility. We will also discuss molecular dynamics simulation results to show how individual variables such as precipitate size, spacing, volume fraction, and/or the chemical driving force of matrix phase transformation can affect deformation mechanisms.
||High-Entropy Alloys, Mechanical Properties, Phase Transformations