| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Dynamic Behavior of Materials X
|
| Presentation Title |
Strain Rate Effects on Shear-band Behavior in Al-Sm System |
| Author(s) |
Nuohao Liu, Xuanxin Liu, Izabela Szlufarska |
| On-Site Speaker (Planned) |
Nuohao Liu |
| Abstract Scope |
Amorphous shear bands in crystalline materials are known to form at high strain rates as pre-cursors to fracture. Oppositely, recent findings reveal that shear bands can enable plasticity at low strain rate. However, how this behavior translates to high strain rate applications remains unknown. Here, the strain rate dependence of shear bands is compared in two intermetallic compositions, Al2Sm and Al3Sm. In Al2Sm, voids initiate and propagate rapidly after the brittle shear band formation, and higher strain rates lead to more decentralized voids. In Al3Sm, shear bands promote plasticity with no voids observed up to 25% strain and showing orientation dependence. When tension along <-2110>, formation of amorphous shear band is preceded by a partial lattice slip. In both compositions, the ductility increases with the strain rate due to the higher shear-band density. Our results demonstrate that shear bands could promote toughness at both low and high strain rates. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Computational Materials Science & Engineering, Mechanical Properties, |