Influence of lattice defects on grain boundary self-diffusion in nickel

0354423 - ÚFM 2011 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Rothová, Věra - Buršík, Jiří - Svoboda, Milan
Influence of lattice defects on grain boundary self-diffusion in nickel.
METAL 2010. Conference proceedings. Ostrava: Tanger, s.r.o, 2010, Čl. ZV22. ISBN 978-80-87294-15-4.
[Metal 2010. International Conference on Metallurgy and Materials /19./. Rožnov pod Radhoštěm (CZ), 18.05.2010-20.05.2010]
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: grain boundary diffusion * nickel * lattice defects
Kód oboru RIV: BJ - Termodynamika

An extremely wide spectrum of experimental results on the grain boundary (GB) self-diffusivities in nickel was published in the literature. Currently, our previously published results show a pronounced dependence of diffusivities on both purity and thermo-mechanical history. A possible reason for the large scatter of published experimental data could be a contribution arising from some crystal lattice defects other than GBs. Thus, in the present work, the impact of the selected lattice defects on diffusion processes, grain growth and twin production has been investigated. Hence, the cast and cold-rolled nickel specimens of purity grades from 99.5% to over 99.99% were selected to study the influence of the material purity and fabrication on microstructure and its evolution during thermal treatment and thereby on the mass transport properties.
Trvalý link: http://hdl.handle.net/11104/0193427