Dresden 2014 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster Session

MM 34.27: Poster

Tuesday, April 1, 2014, 18:00–20:00, P4

Analysis of the pressure dependence of plasticity in nanocrystalline Pd90Au10 — •Anja Steinbach, Nicole Fèvre, Christian Braun, and Rainer Birringer — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus D2.2, 66123 Saarbrücken

We examine the pressure or normal stress dependence of the mechanical behavior of nanocrystalline Pd90Au10 by utilizing the miniaturized shear compression specimen (m-SCS) [1]. In this specific testing geometry, the plastic deformation caused by dominant shear stress is confined to the gauge section which is inclined at an angle α (α = 45^∘ for standard geometry) relative to the loading direction. Variations of the inclination angle allow varying the superimposed hydrostatic pressure in the gauge section. Based on the experimentally determined force-displacement diagram, the stress-strain-curve and further parameters like the hydrostatic pressure are calculated using FEM-simulations. On this poster we present inclination angle-dependent stress-strain-curves obtained from inert gas condensed Pd90Au10 samples with a mean grain size of 10 nm. In agreement with theory [2], we find that nanocrystalline Pd90Au10 is stronger under pressure.

[1] M. Ames, J. Markmann, R. Birringer, Mater. Sci. Eng. A 528, 526 (2010) [2] A.C. Lund, C.A. Schuh, Acta Mater. 53, 3193 (2005)