| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Multi-Principal Element Alloys IV: Mechanical Behavior
|
| Presentation Title |
Study on Superplastic Behavior of L21 Precipitate-Hardened BCC High Entropy Alloy |
| Author(s) |
Kanghyun Park, Sang-Hun Shim, Kangjin Lee, Yunjong Jung, Ka Ram Lim, Chanho Lee, Gian Song |
| On-Site Speaker (Planned) |
Kanghyun Park |
| Abstract Scope |
Superplasticity is defined as the capability to undergo excellent plastic deformation over a few hundred percent, which can provide exceptional formability. Although superplasticity is known to mainly occur by grain boundary sliding (GBS), it can occur by dynamic recrystallization (DRX). For example, the ultrafine grains with low-angle boundaries can change into high-angle boundaries during deformation at high-temperature, which stimulates GBS. In our previous study, we developed the L21 precipitate-hardened Al-Cr-Fe-Ni-Ti high entropy alloys (HEAs) with exceptional high-temperature strength but showed insufficient formability. To overcome this drawback, we applied hot-rolling processes to obtain ultrafine sub-grain structures that can induce DRX. It was found that low-angle grain boundaries were transformed into high-angle grain boundaries during high-temperature deformation, which implies the occurrence of DRX. In this study, we systematically investigated the superplastic behavior of Al-Cr-Fe-Ni-Ti HEA with various deformation conditions, such as temperature and strain rate. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
High-Entropy Alloys, Mechanical Properties, High-Temperature Materials |