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Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 15: Poster Session

MM 15.15: Poster

Montag, 11. März 2013, 18:00–20:00, Poster E

Investigation of the loading state dependent fracture behaviour of nanocrystalline PdAu — •Christian Braun and Rainer Birringer — Universität des Saarlandes, FR 7.2 Experimentalphysik, Campus D2.2, 66123 Saarbrücken

Numerous experiments exhibited that nanocrystalline materials with a mean grain size in the range of 10 to 20 nm behave different in compression and tension testing, in agreement with molecular dynamic simulations. However, investigations with other loading conditions between these two limiting cases are still scarce.

We used the miniaturized shear compression specimen (m-SCS) to study the mechanical response of nanocrystalline PdAu samples under different loading states by varying the shear angle. Since the deformation of the m-SCS samples is constrained to a cross section of 0.1 mm2, it becomes possible to in-situ observe plastic shear and/or crack nucleation and propagation using light microscopy. Additional, post mortem REM-analysis of the fracture surfaces is carried out. We present results for specimens with shear angles of 45 and 60. Although, upon loading a specimen, the difference in the hydrostatic pressure is small between this two sample geometries, they show a completely different behaviour: while for the 45 specimens a ductile deformation up to 20% strain is observed, the 60-samples show brittle fracture in the transition regime from elastic to plastic deformation.

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