Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.2: Poster

Dienstag, 8. März 2016, 18:30–20:30, Poster B3

Surface Nucleation Controlled Plasticity in Twinned Gold Nanowires — •Zhuocheng Xie, Jakob Renner, Aruna Prakash, and Erik Bitzek — Friedrich-Alexander-Universität Erlangen-Nürnberg, Materials Science & Engineering, Institute I, Erlangen, Germany

Metallic nanowires (NWs) receive currently much attention due to their often superior mechanical properties compared to bulk materials. Similarly, nanotwinned metals have lately attracted a lot of interest because they combine high strength with high ductility, two properties which have been thought to be mutually exclusive. Recently, nanotwinned nanowires were reported, which could combine both strengthening mechanisms, namely surface dislocation nucleation controlled plasticity and hardening due to dislocation - twin interactions.

Here, we report on molecular dynamics simulations of tensile tests on single and multi-twinned Au nanowires with <110> and <112> orientations. The interactions of partial dislocations nucleated at the surfaces with the twin boundaries parallel to the wire axis are analyzed in detail and the resulting deformation behavior is compared to recent experiments.