About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
Development and Characterization of Gradient Nanostructured Metals via Compositional Means |
Author(s) |
Alejandro Barrios, James Nathaniel II, Joseph Monti, Khalid Hattar, Douglas Medlin, Remi Dingreville, Brad Boyce |
On-Site Speaker (Planned) |
Alejandro Barrios |
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 |
Thin Films and Interfaces, Mechanical Properties, |