Regensburg 2010 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster Session

MM 26.22: Poster

Dienstag, 23. März 2010, 14:45–16:30, Poster C

Deformation of Au Nanoparticles — •Andreas Kelling, Burkhard Roos, and Cynthia A. Volkert — Institut für Materialphysik, Universität Göttingen, D-37077 Göttingen

Compression experiments and TEM investigations have been performed on Au nanoparticles with diameters between 80 and 250 nm in an effort to understand nucleation and motion of dislocations in small volumes. TEM images of the 80 nm nanoparticles confirm that they are twinned in their as-received condition, but that the twins can be annealed out by heating to 400°C. Compression of the 250 nm diameter particles with a flat punch in a nanoindenter gives reproducible force-displacement curves, allowing controlled deformation of the nanoparticles to the desired strain. In preparation for TEM investigations of the deformed nanoparticles, compression tests have been performed on 80 nm diameter nanoparticles placed on a TEM-transparent SiN membrane. By investigating the stored dislocations in the deformed nanoparticles, it is hoped that insights will be gained into the mechanisms that lead to the high strength of sub-micrometer metal specimens.