| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Formation of Local Chemical Ordering in FCC HEAs and Its Effect on the Deformation Behaviors |
| Author(s) |
Kooknoh Yoon, Hyunseok Oh, Juhyun Oh, Miyoung Kim, Batiste Gault, Dierk Raabe, Eun Soo Park |
| On-Site Speaker (Planned) |
Eun Soo Park |
| Abstract Scope |
High entropy alloys(HEAs) exhibit pronounced mechanical properties due to their complex atomic configurations. These exceptional properties are known to be influenced by various factors, and recently, the formation of chemical ordering at the atomic scale has been widely reported for its significant role in enhancing these characteristics. However, detecting local chemical ordering(LCO) is challenging, as it consists of small clusters of atoms with preferential bonding among specific elements, leading to thermodynamic stability. This study systematically investigates the influence of LCO formation on the deformation mechanisms in various CrMnFeCoNi HEAs. These FCC HEAs exhibit varying stacking fault energies, resulting in multiple deformation mechanisms, including mechanical twinning and martensitic transformation, in addition to dislocation slip. By carefully controlling the LCO formation through thermal history and performing intensive structural analyses, including APT, EXAFS, and HRTEM, we aim to establish a tuning strategy for optimizing mechanical properties in HEAs based on atomic-scale structural information. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, |