About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
Micro-scale Fracture Mechanics of BaTiO3 Thin Films |
Author(s) |
Balila Nagamani Jaya, Nidhin G Mathews |
On-Site Speaker (Planned) |
Balila Nagamani Jaya |
Abstract Scope |
Barium Titanate thin films are used at microscale as capacitors, actuators, and sensors, where mechanical failure due to cracking and delamination occur due to electric and thermal cycling. Here, we study their fracture behavior as a function of film thickness, residual stress and nature of interfaces using micromechanical experiments and finite element modelling. Nanoindentation is applied as a dilatometer to determine Tc of the films. Microcantilever fracture tests revealed that free-standing thin films showed a 60% lower KIC than single crystals due to weak inter-columnar boundaries. However, bilayered film- substrate combinations revealed an increase in fracture toughness when the crack tip is near to a stiffer substrate. It was seen that the crack driving force decreased in line with predictions from the FEM. In situ tensile shear lag tests in combination with digital image correlation was used to understand the cracking behavior of these films when deposited on flexible substrates. |
Proceedings Inclusion? |
Planned: |
Keywords |
Thin Films and Interfaces, Mechanical Properties, Modeling and Simulation |