About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
|
Presentation Title |
Effect of Interfacial Structure on Mechanical Behavior of Nanolayered Ti/TiN Composites |
Author(s) |
Ashlie A. Hamilton, Justin Y Cheng, Mauricio De Leo, Kevin Baldwin, Nathan A Mara |
On-Site Speaker (Planned) |
Ashlie A. Hamilton |
Abstract Scope |
Metal-Ceramic Composites have been used to enhance the performance of materials by combining the benefits of high hardness from the ceramic layer and ductility of the metallic layer. Our recent work revealed that chemical and structural gradients over nanometer length scales simultaneously enhance the strength and deformability of nanolayered composites. However, this work has been limited to metallic systems. In this study, multilayer Ti/TiN composites containing either chemically abrupt interfaces, or a nitrogen gradient were deposited via magnetron sputtering. Spherical and Berkovich nanoindentation determines hardness, modulus, and indentation stress-strain behavior as a function of layer thickness and interface structure. Transmission Electron Microscopy reveals a gradient in structure over nanometers to tens of nanometers between the hexagonal-close-packed pure titanium phase, and the NaCl-type structure of TiN. We discuss strengthening effects in terms of the interplay between layer thickness, atomic interfacial structure and chemistry, and dislocation-based mechanisms. |
Proceedings Inclusion? |
Planned: |
Keywords |
Composites, Mechanical Properties, Thin Films and Interfaces |