Berlin 2015 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 40: Nanomaterials II: Mechanical Properties
MM 40.4: Vortrag
Mittwoch, 18. März 2015, 16:30–16:45, H 0107
An analysis of thermal activation parameters in nanocrystalline metals — •Anja Steinbach, Manuel Grewer, and Rainer Birringer — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus D2.2, 66123 Saarbrücken
We studied the plasticity of thermally equilibrated and non-equilibrated nanocrystalline (NC) Pd90Au10 samples with grain sizes below 10 nm by using the miniaturized shear compression specimen (m-SCS) [1]. We performed strain-rate and temperature-dependent mechanical tests under dominant shear and superimposed compression up to large plastic strains to deduce the shear activation volume Δ v, strain-rate sensitivity m, as well as the Gibbs free energy of activation Δ G. These thermal activation parameters are most informative for probing the mechanisms of thermally activated plasticity [2].
[1] M. Ames, J. Markmann, R. Birringer, Mater. Sci. Eng. A 528, 526 (2010)
[2] M. Grewer, and R. Birringer, Phys. Rev. B 89, 184108 (2014)