| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Mechanical Behavior at the Nanoscale V
|
| Presentation Title |
Improved Strength and Toughness in Metal-MAX Nanolaminates Through Nanoscale Mechanistic Competition |
| Author(s) |
Jacob Gruber, Siddhartha Pathak, Garritt Tucker |
| On-Site Speaker (Planned) |
Jacob Gruber |
| Abstract Scope |
Metal-MAX nanolaminates with layer thickness below 50nm are hierarchical, multi-layered nanocomposite materials that exhibit tunable strength and toughness, under both compressive and tensile stresses. Layering both between metal and MAX layers, as well as within the MAX phase itself give rise to unique mechanical behavior. Using atomistic simulation, the deformation of nanolaminates in a variety of configurations mirrors the behavior observed in experiment. Increased strength and toughness are observed, especially in specific orientations, and orientation also determines the failure mode, whether kinking, in-plane dislocation plasticity or interfacial sliding. Leveraging kinematic metrics at the atomic scale, we identify that these transitions arise from the competition of atomic deformation mechanisms, whose activation depends on orientation. Modulation of layer thickness allows for the competition to be tuned. This tunability has the potential for use in high-temperature structural applications, leveraging the unique mechanical properties of the composite as well as it’s thermal stability. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |