Radiotracer investigation of silver grain boundary diffusion and segregation in copper bicrystals at low temperatures: the direct determination of grain boundary diffusion coefficients

• Antragsteller: Professor Dr. Sergiy Divinski
• Fachliche Zuordnung: Thermodynamik und Kinetik sowie Eigenschaften der Phasen und Gefüge von Werkstoffen
• Förderung: Förderung von 2009 bis 2015
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 163598987

• Erstellungsjahr: 2015

Zusammenfassung der Projektergebnisse

In the current project almost all goals were achieved. However, several unexpected results were obtained, too. Among such results are the first precise measurements of diffusion coefficients of single grain boundaries and an unambiguous prove of the occurrence of temperature-induced grain boundary phase transitions. These achievements allowed the first in-depth analysis of the underlying diffusion mechanisms of atomic transport and segregation in a single grain boundary that in fact was provided by a combination of radiotracer diffusion measurements and atomistic modelling. These were breakthrough investigations in the field of grain boundary diffusion and represent a kind of benchmark results for future studies. The results obtained on different grain boundaries (currently on Σ5 and Σ17 in Cu) substantiate the non-uniqueness of the crystalline phase transitions in grain boundaries which could be induced by temperature variation or solute segregation. A dedicated research along these two directions would be of fundamental importance, along with similar investigations on other FCC metals.

Projektbezogene Publikationen (Auswahl)

• Diffusion and segregation of silver in copper Σ5(310) grain boundary, Phys. Rev. B 85 (2012) 144104
  S.V. Divinski, H. Edelhoff, S. Prokofjev
  (Siehe online unter https://doi.org/10.1103/PhysRevB.85.144104)
• Effect of interface phase transformations on diffusion and segregation in high-angle grain boundaries, Phys Rev Lett 110 (2013) 255502
  T. Frolov, S.V. Divinski, M. Asta, Y. Mishin
  (Siehe online unter https://doi.org/10.1103/PhysRevLett.110.255502)
• Thermodynamics, Diffusion and the Kirkendall Effect in Solids, Springer Int. Publ. Switzerland, 2014, 522 pp.; ISBN 978-3-319-07460-3
  A. Paul, T. Laurila, V. Vuorinen, S.V. Divinski
  (Siehe online unter https://doi.org/10.1007/978-3-319-07461-0)