|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||Design of HEAs Strengthened by L12 Precipitates using High Throughput Thermodynamic Calculations
||Thomas Rieger, Jean-Marc Joubert, Mathilde Laurent-Brocq, Jean-Philippe Couzinié
|On-Site Speaker (Planned)
High entropy alloys (HEAs) are considered as potential candidates for structural applications at high temperatures. Nevertheless, the mechanical behavior of the sole solid solution is not enough to withstand temperatures exceeding 800°C. Additional sources of strengthening are required before considering future applications.
The most obvious way to strengthen fcc HEAs is to mimic nickel superalloys microstructure in which ordered precipitates are used to reinforce the disordered matrix with fcc structure. Accordingly, high throughput CALPHAD calculations are performed on the Ni-Co-Cr-Fe-Ti-Al senary system, allowing to map the entire composition space and to locate compositions with the desired fcc+L12 duplex microstructure. From these calculations, the role of each element on the microstructure is evaluated and an innovative method to represent the senary phase diagram is proposed. Five compositions of interest have been selected, synthesized and characterized. Good agreement between calculations and experimental results is observed.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume