About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
|
High Entropy Alloys IX: Structures and Modeling
|
Presentation Title |
Core Effect of Local Atomic Configuration and Design Principles in AlxCoCrFeNi High-entropy Alloys |
Author(s) |
Yu-Chia Yang, Zhenhai Xia |
On-Site Speaker (Planned) |
Zhenhai Xia |
Abstract Scope |
High-entropy alloys (HEAs) are known to have four core effects leading to superior properties over traditional alloys. In this paper, we investigate an additional core effect, local atomic configuration, due to inherent variations of local chemical composition at the nanoscale. The stacking fault and twin formation energies of AlxCoCrFeNi HEAs, calculated with density functional theory methods, show large variations and even negative energies due to the local atomic configurations. A design principle is proposed to predict the mechanical properties of the HEAs. The effect of temperature on stacking fault energy is also determined, which is consistent with experimental results. |
Proceedings Inclusion? |
Planned: TMS Journal: Metallurgical and Materials Transactions |