About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Materials Processing and Kinetic Phenomena: From Thin Films and Micro/Nano Systems to Advanced Manufacturing
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Presentation Title |
The Interface between a Body-centered Cubic Crystal and Its Melt |
Author(s) |
Frans A. Spaepen |
On-Site Speaker (Planned) |
Frans A. Spaepen |
Abstract Scope |
Solidification experiments on undercooled metallic liquids whose stable crystalline phase is face-centered cubic often first yield a metastable body-centered cubic phase. This means that the crystal-melt interfacial energy for the bcc phase is lower than that for the fcc phase. In his doctoral thesis, Carl Thompson provided a structural explanation for this difference, based on the smaller entropy loss in the liquid layer next to the crystal. Later computer simulations have confirmed this difference as well. Although it is difficult to measure the crystal-melt interfacial enery directly, it is possible to determine a closely related quantity, the interfacial stiffness, from the spectrum of positional fluctuations. Experiments on colloidal crystals that form both fcc and bcc phases find a lower interfacial stiffness for bcc. |
Proceedings Inclusion? |
Planned: |
Keywords |
Phase Transformations, Solidification, Modeling and Simulation |