| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Heterostructured and Gradient Materials (HGM IV): Tailoring Heterogeneity for Superior Properties
|
| Presentation Title |
Thickness-dependent Shear Localization in Cu/Nb Metallic Nanolayered Composites |
| Author(s) |
Caizhi Zhou, Shujing Dong |
| On-Site Speaker (Planned) |
Caizhi Zhou |
| Abstract Scope |
Metallic nanolayered composites (MNCs) are a special class of composite materials made from alternative layers of different constituents with the layer thickness at nanometer scale. Recent studies have shown clear length scale-dependent plastic deformation instability in MNCs, as the shear band formed in samples with layer thickness below a critical value. In this work, we performed molecular dynamics simulations to study the effect of layer thickness on the shear localization in Cu/Nb MNCs. Our simulation results achieve good agreement with experimental results that the inverse size effect in the strength occurs in samples with layer thickness below 2.0 nm. The strain softening observed in those samples was triggered by the shear localization. The quantitative analysis revealed that the unsymmetrical dislocation transmission across the interface induces the shear localization and promotes the shear band formation in Cu/Nb MNCs. The plastic strain mainly comes from the interface sliding within the shear band. |
| Proceedings Inclusion? |
Planned: |