About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Heterostructured and Gradient Materials (HGM V): New Mechanistic Discoveries Enabling Superior Properties
|
Presentation Title |
L-47-Invited Poster: Chemically-induced Gradient Nanostructures |
Author(s) |
Brad L. Boyce, Alejandro Barrios, James Nathaniel, Joseph Monti, Khalid Hattar, Douglas Medlin, Remi Dingreville |
On-Site Speaker (Planned) |
Brad L. Boyce |
Abstract Scope |
Nanocrystalline metals are usually highly unstable and exhibit poor ductility. Common strategies to overcome these two challenges are to introduce an alloying element, stabilizing the microstructure via kinetic and thermodynamic mechanisms, and to develop gradient nanostructured films. In this work, we combine both strategies and introduce a methodology to fabricate gradient nanostructured films via chemical compositional means. We demonstrate that annealing an alloyed PtAu thin film, fabricated with a compositional gradient, results in a film with a microstructural gradient. We employ phase-field modeling to further explore the competing mechanisms of Au diffusion and thermally induced grain growth. We additionally investigate the mechanical behavior of these gradient films and compare its behavior to microstructurally homogeneous films. This new fabrication method offers an alternative for the development of the next generation of thin films with increased mechanical performance. SNL is managed and operated by NTESS under DOE NNSA contract DE-NA0003525. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Thin Films and Interfaces |