About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Self-organizing Nano-architectured Materials
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Presentation Title |
Quasi-periodic Nanoarchitectures in Eutectic Thin Films: Lengthscales and Inherent Instabilities |
Author(s) |
Eli Sullivan, Jonathan Skelton, James Fitz-Gerald, Jerrold A. Floro |
On-Site Speaker (Planned) |
Jerrold A. Floro |
Abstract Scope |
Directional melting and solidification in eutectic alloys forms interdigitated bicrystals with regular, irregular or chaotic nanoarchitectures, with lengthscales that are controlled by the solidification speed. Eutectic nanostructures can be obtained in bulk, thin films and particles, and across metals, oxides and polymers. The resultant structure is of interest for studying interfacial scattering and anisotropy in energy transport, and as an alternative schema for nanostructured functional materials. In eutectic Al-Cu thin films, highly-regular, parallel phase lamellae with periodicities below 50 nm are readily obtained, and values below 20 nm should be achievable. Chaotic lamellar structures featuring continuous but tortuous lamellae may occur when composition deviates from the eutectic. Solitary tilt waves, oscillatory instabilities, and extreme lamellar branching events arise due to inherent instabilities associated with the moving solid-liquid interface during hypoeutectic solidification. Additional structural control may be afforded using pre-imposed patterning. Support of the NSF under grant DMR-1663085 is gratefully acknowledged. |
Proceedings Inclusion? |
Undecided |
Keywords |
Solidification, Nanotechnology, Thin Films and Interfaces |