| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solution, Intermetallics, Ceramics, Functional Materials and Beyond
|
| Presentation Title |
Effect of Grain Size and Strain Rate on the Deformation Mechanism of Nanocrystalline HEAs Using Molecular Dynamics Simulations |
| Author(s) |
Ankit Roy, Ganesh Balasubramanian |
| On-Site Speaker (Planned) |
Ankit Roy |
| Abstract Scope |
HEAs have garnered notable interest since their inception due to their potential for maintaining excellent mechanical properties at high temperatures. Though their mechanical properties have been well investigated, the effect of grain size and deformation rate on its properties are yet to be explored. Most HEAs follow the Hall-Petch relation at the micron level grain size, but the Hall-Petch relation breaks down below a critical grain size in nanocrystalline HEAs. Below the critical grain size, materials follow an inverse Hall-Petch relation where strength does not increase with reducing grain size but instead, flow stress maintains a linear relation with d-1/2, where d is the average grain diameter. In parallel, the effect of increasing strain rate is studied on a fixed grain size and an increase in stress strain gradients is noted. The switching of deformation mechanism from slip to grain boundary slide is the primary factor responsible for these phenomena. |