| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
The Influence of 3D Interfaces on the Mechanical Behavior of Nanoscale Metallic Multilayers |
| Author(s) |
Justin Y. Cheng, Kevin Baldwin, Youxing Chen, Nan Li, Irene Jane Beyerlein, Nathan Allan Mara |
| On-Site Speaker (Planned) |
Justin Y. Cheng |
| Abstract Scope |
Nanoscale metallic multilayers (NMMs) are layered composites that are ideal for exploring the role of interfacial structure on deformation behavior. Most NMMs studied so far have been synthesized with atomically sharp, or 2D interfaces. In contrast, this work focuses on interfaces that are structurally graded in the out-of-interface plane direction. These “3D interfaces” influence the hardness and deformability of materials in ways that are not yet well quantified. We show that 3D interface-containing Cu/Nb NMMs display distinct anisotropy in mechanical response at single-phase layer thicknesses of <20 nm. TEM characterization of the atomic structure of 3D interfaces before and after deformation reveal the underpinnings of anisotropy and size effects found in nanoindentation and in-situ micropillar compression of NMMs. These effects can be quantified and explained by the relationship between the dominant deformation mechanisms (dislocation-interface interactions, interfacial sliding) and the atomic structure of 3D interfaces of varying thickness. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |