About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
2020 Technical Division Student Poster Contest
|
Presentation Title |
SPG-56: Core Effect of Local Atomic Configuration and Design Principles in AlxCoCrFeNi High-entropy Alloys |
Author(s) |
Yu-Chia Yang, Cuixia Liu, Chun-Yu Lin, Zhenhai Xia |
On-Site Speaker (Planned) |
Yu-Chia Yang |
Abstract Scope |
High-entropy alloys (HEAs) are known to have four core effects leading to superior properties over traditional alloys. Here 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 and stacking fault energies of the HEAs by controlling the chemical composition. The effect of temperature on stacking fault energy is also determined, which is consistent with experimental results. |
Proceedings Inclusion? |
Undecided |