About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
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Symposium
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Self-organizing Nano-architectured Materials
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Presentation Title |
Self-organizing Gradient Nanostructures via Chemical Heterogeneities |
Author(s) |
Brad L. Boyce, Khalid Hattar, Remi Dingrevillie, Doug Medlin, Joseph Monti, Alejandro Barrios, James Nathaniel, Zachary Milne, David Adams |
On-Site Speaker (Planned) |
Brad L. Boyce |
Abstract Scope |
Gradient nanostructured metals possess unique combinations of properties achieved as a result of the heterogeneous grain structure. However, most efforts to produce gradient nanostructures have relied on differential severe plastic deformation confined to the near-surface regions, such as via surface mechanical attrition treatment or SMAT. Those techniques require line-of-sight access to the surface of interest, and can only produce the finest grain sizes at the surface. In contrast, by depositing a binary nanocrystalline alloy with gradient composition, it is possible to achieve self-stabilized gradient grain sizes through annealing. In this work, we employ phase field calculations to understand the thermodynamic and kinetic effects of the gradient composition and guide the selection of appropriate thermochemical parameters and validate this approach through annealing experiments and Chemi-STEM aberration corrected energy dispersive spectroscopy in the Pt-Au binary alloy system. This new compositional gradient approach offers a new potential for commercial processing of heterogeneous nanostructures.
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Proceedings Inclusion? |
Undecided |
Keywords |
Thin Films and Interfaces, Modeling and Simulation, Process Technology |