| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
High Entropy Materials: Concentrated Solid Solutions, Intermetallics, Ceramics, Functional Materials and Beyond V
|
| Presentation Title |
Interaction between Dislocation and Grain Boundary in Nanoindentation of Polycrystalline Al0.3CoCrFeNi Alloy |
| Author(s) |
Yuhong Zhao |
| On-Site Speaker (Planned) |
Yuhong Zhao |
| Abstract Scope |
The interaction between dislocations and grain boundaries during nanoindentation of Al0.3CoCrFeNi high entropy alloy was studied by using the molecular dynamics and phase field simulation. Results indicates that dislocation rosettes caused by dislocation cross-slip and dislocation tangles at grain boundaries suppress dislocation motion, leading to the work hardening. After plastic deformation, grain boundaries are the main factor leading to the softening effect: (i) dislocations are blocked by grain boundaries and glide along them; (ii) dislocations are absorbed by grain boundaries; (iii) dislocations are transmitted to adjacent grains; (iv) dislocations absorbed in grain boundaries cause re-emission of dislocations in adjacent grains; and (v) re-emitted dislocations glide along grain boundaries and are absorbed again. |