This paper offers a heuristic thermodynamic analysis of the selection of solidification microstructures formed during re-solidification of micro layers of molten metal driven by surface tension. This study explores empirical evidence obtained by performing a tightly controlled heating-dwell-cooling materials processing cycle that causes melting followed by re-solidification of micro layers of an Al + Si alloy in ultra high purity nitrogen. Identification of characteristic process parameters responsible for crystal pattern formation of the α-phase solid solution during associated rapid quench is discussed. The focus of the inquiry is ultimately directed toward solid solution dendrites population morphology. A transition from a scarce (even single or non existent) dendrite formation toward chaotically distributed α-phase dendrites imbedded in two-phase eutectic is identified. A heuristic approach has been established to interpret alpha phase dendrite pattern formation during solidification phenomena driven by entropy generation at the liquid-solid interfaces.
A Heuristic Thermodynamic Interpretation of a Mechanism Responsible for the Selection of Solidification Microstructures
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Sekulic, DP. "A Heuristic Thermodynamic Interpretation of a Mechanism Responsible for the Selection of Solidification Microstructures." Proceedings of the ASME 2002 International Mechanical Engineering Congress and Exposition. Advanced Energy Systems. New Orleans, Louisiana, USA. November 17–22, 2002. pp. 297-302. ASME. https://doi.org/10.1115/IMECE2002-39521
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