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Meeting 2026 TMS Annual Meeting & Exhibition
Symposium Chemistry and Physics of Interfaces
Presentation Title A reversible grain boundary complexion transition in gold-platinum alloys
Author(s) Sebastian Calderon, Wen-Yu Chen, Md. Shariful Islam, Sai S. Tripathy, Maarten P. de Boer, Elizabeth C. Dickey, Gregory S. Rohrer
On-Site Speaker (Planned) Gregory S. Rohrer
Abstract Scope Solute segregation to grain boundaries in polycrystalline metals and ceramics is a well-known phenomenon. We have found that in Au-rich Au-Pt alloys, it is the solvent (Au) that is enriched at the grain boundaries. After heating in the range of 500 °C to 600 °C and quenching to room temperature, grain boundaries in the alloy are enriched in Au at a mean level of ~ 4 atoms/nm2. When the alloy is annealed at 300 °C and quenched, the mean grain boundary composition is closer to the bulk composition. When the alloy is reheated to 500 °C, the segregation is reestablished, demonstrating that the transformation from the strongly segregated complexion to the weakly segregated complexion is reversible. In this case, the stronger driving force for the solvent segregation is likely the lower grain boundary energy of Au in comparison to Pt.
Proceedings Inclusion? Planned:
Keywords Thin Films and Interfaces,

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