| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
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| Presentation Title |
Investigation on Superplastic Behavior of L21 Precipitate-Strengthened Al-Cr-Fe-Ni-Ti High Entropy Alloy |
| Author(s) |
Kanghyun Park, Kangjin Lee, Sang Hun Shim, 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 remarkable 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 insufficient ductility at room temperature. To overcome this drawback, we applied hot-rolling processes to obtain sub-grain structure. Specifically, the ultrafine low-angle grain boundaries were formed after processing. It was found that low-angle grain boundaries were transformed to 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. |