|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||High Temperature, Low Cost and Light Weight High Entropy Superalloys
||Jithin Joseph, Karl Shamlaye, Manisha Senadeera, Santu Rana, Sunil Gupta, Svetha Venkatesh, Matthew Barnett, Daniel Fabijanic
|On-Site Speaker (Planned)
The single FCC phase high entropy alloys (HEAs) such as CoCrFeNi and CoCrFeMnNi showed exceptional ductility, work hardenability and fracture toughness, but are not strong enough for engineering applications at room and elevated temperatures. This study aim towards a new alloy design space for FCC HEAs strengthened by the coherent L12 γ′ precipitates. The exploration is made on a set of six elements using machine learning algorithm from Thermocalc (HEA3 database) based on Ni-Al-Co-Cr-Fe-Ti system. These bulk alloy compositions with a high volume fraction of γ′ precipitates (60%) and high concentration of Al and Ti (>16 at.%) were fabricated using direct laser deposition. HEAs such as Ni54Co20Fe5Cr5Al12Ti4 showed a high yield strength of 650 MPa at 800 °C, γ′ dissolution temperature of 1200 °C, excellent high-temperature coarsening resistance and low density (<7.6 g/cm3) without any detrimental TCP phases after long-term exposure at elevated temperatures is designed using this strategy.