| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Defects and Interfaces: Modeling and Experiments
|
| Presentation Title |
Mechanistic-Design of Multilayered Metal-Metal and Metal-Ceramic Nanocomposites for Tunable Strength and Toughness |
| Author(s) |
Siddhartha Pathak, Amit Misra, Nathan Mara |
| On-Site Speaker (Planned) |
Siddhartha Pathak |
| Abstract Scope |
This presentation will summarize my work at LANL conducted under the mentorship of the late Dr. Richard (Dick) Hoagland. We explore the synthesis of multilayered composites where one constituent phase has a low ductility, with a final goal of enhancing the system’s strength and toughness. We synthesized multiple multilayered systems using PVD and ALD: metal-ceramic (Cu-TiN, Al-TiN, where the ceramic is the brittle phase), metal-MAX (Nb–Ti2AlC, Ti-Ti3AlC2, where the interfaces between the layers are in direct competition with the internal interfaces within the MAX layers) and a unique bcc Mg-Nb system (where the hcp-to-bcc pseudomorphic transformation leads to enhanced ductility in Mg), with a lamellar thickness reduced to the nanoscale. We utilize a combination of nanoindentation, micro-compression, micro-tensile, and fracture toughness testing of 3-point bend micro-beams, under extremes of temperature (cryo-to-1000C) and strain rate (10^-3 to 10^3/s), and post-deformation TEM analysis to evaluate their deformation mechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Thin Films and Interfaces, Mechanical Properties, Characterization |