About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Chemistry and Physics of Interfaces
|
Presentation Title |
An In-situ Transmission Electron Microscopy Study of Phase Stability in Fe-W Crystalline-Amorphous Nanomultilayers |
Author(s) |
Cormac Killeen, Kyle Russell, Andrea M. Hodge, Jason Trelewicz |
On-Site Speaker (Planned) |
Cormac Killeen |
Abstract Scope |
At certain chemical compositions, an amorphous structure can be achieved in the Fe-W system that is surprisingly stable up to intermediate homologous temperatures of 700-800°C. This structure undergoes devitrification and phase separation as temperatures continue to increase. In this study, the phase stability of a sputtered Fe-W nanomultilayers containing pure nanocrystalline Fe with alternating co-sputtered amorphous Fe-W layers of varying thickness is explored using in-situ electron microscopy and differential scanning calorimetry. The Fe-W amorphous layer is shown to be stable up to 500°C for both layer thicknesses, however phase separation proceeds slower in the thicker amorphous layer sample as temperatures increase to 750°C. Results indicate that the diffusion of the chemical species to their own domains during separation is rate limited by the thickness of the stable amorphous phase as well as the lower volume fraction of interfacial area rather than the global composition of W. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Phase Transformations, Thin Films and Interfaces |