| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ultrafine-grained and Heterostructured Materials (UFGH XI)
|
| Presentation Title |
Atomistic Analysis of the Effect of Internal Defects on the Deformation of Nanocrystalline Metals |
| Author(s) |
Caizhi Zhou, Sixie Huang |
| On-Site Speaker (Planned) |
Caizhi Zhou |
| Abstract Scope |
Nanocrystalline (NC) metals normally process ultrahigh strength in comparison to the coarse-grained counterparts. While the fracture strain of most NC metals, such as copper and nickel, is usually less than 5% due to the limited space for dislocation accumulation inside the grains, and voids and cracks are preferred to nucleate at grain boundaries after yielding. Adding defects inside the nano grains is one strategy to minimize the trade-off of strength versus ductility. In this work, we aim to understand the effect of different types of internal defects (nano-domain and Frank-Read source) on the crack nucleation in NC metals by molecular dynamics simulations. We compare the in stress-strain responses of pristine and defected NC metals. We also analyze the internal stress on the grain boundary atoms, dislocation density evolution, void volume fraction evolution and plastic contribution from dislocation or grain boundaries activities. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume |