|About this Abstract
||1st World Congress on High Entropy Alloys (HEA 2019)
||High Entropy Alloys 2019
||Effect of Local Chemical Ordering on Mechanical Properties in High Entropy Alloys
||Kook Noh Yoon, Hyunseok Oh, Zhang Jing , Baptiste Gault, Dierk Raabe, Eun Soo Park
|On-Site Speaker (Planned)
||Kook Noh Yoon
High entropy alloys (HEAs) are constituted with multi-principal elements in single solid solution. Thus, it is important to understand the local environment around the specific constituents. In particular, the local chemical ordering (LCO) can be formed by a stronger driving force to make preferential bonding depending on the constituents. Moreover, some of simulation results are proposed that stacking fault energy (SFE) of HEAs is locally tunable by forming these LCOs. In the present study, we systematically evaluate the influence of LCO formation on mechanical properties in FCC HEAs with different SFEs. The LCO formation was carefully controlled by solidification history and annealing conditions, and then was confirmed by intensive structural analysis. As a result, we report the meaningful changes of mechanical properties depending on LCOs in HEAs with same composition. This work will give us a new pathway to optimize the mechanical property of HEAs by controlling atomic-scale structure.