Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 51: Nanomaterials - Nanocrystalline & Porous Materials I
MM 51.4: Vortrag
Donnerstag, 14. März 2013, 11:00–11:15, H25
Solid solution strengthening in nanocrystalline Pd-Au alloys — •Andreas Leibner1, Manuel Grewer1, Christian Braun1, Jonas Heppe1, Jochen Lohmiller2, Patric Gruber2, and Rainer Birringer1 — 1Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus D2 2, 66123 Saarbrücken — 2Karlsruher Institut für Technologie, Institut für Angewandte Materialien, Hermann-von-Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen
It is well known that nanocrystalline (nc) materials show enhanced mechanical properties depending on their grain size. In binary alloys, solute drag enhances the stability of the nanoscale microstructure. However, systematic studies on the influence of solute content on the mechanical response of nc alloys with constant grain size are still scarce. Here we report on the influence of gold concentration on the strength of nc Pd-Au with 10nm-sized grains. The samples were prepared by inert gas condensation and tested in shear-compression-specimen (SCS) geometry. While all Pd-Au compositions show the typically increased strength due to grain refinement, the overall trend is a fairly linear strength decrease with rising gold concentration. In contrast, Vickers hardness measurements on arc melted coarse grained Pd-Au alloys exhibit classical solid solution hardening.