About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Dynamic Behavior of Materials IX
|
Presentation Title |
Mechanisms Responsible for Kinking in Layered Crystalline Solids |
Author(s) |
Gabriel Plummer, Xingyuan Zhao, Leslie Lamberson, Garritt Tucker |
On-Site Speaker (Planned) |
Gabriel Plummer |
Abstract Scope |
Kinking is a deformation mode shared by many layered materials, ranging from geological formations to layered crystalline solids (LCSs). Observations of kinking in LCSs date back over 100 years, but the underlying mechanisms have remained elusive. Utilizing newly developed interatomic potentials, atomistic simulations provide the first dynamic demonstration of kinking in LCSs, with the MAX phases, ternary carbides and nitrides, as a model material. The results show that kinking occurs when elastic layer buckling couples with nucleation of basal dislocation dipoles. Notably, the resulting kink boundaries remain elastically strained with pronounced curvature over several nanometers, making the process reversible in many scenarios. An important consequence of this mechanism is that microstructures oriented favorably for kinking exhibit significant strengthening at high strain rates. These mechanistic insights should serve to help better design innovative structural materials which utilize the unique properties offered by kinking in LCSs. |
Proceedings Inclusion? |
Planned: |
Keywords |
Ceramics, Modeling and Simulation, Mechanical Properties |