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Regensburg 2022 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 10: Poster Session 1

MM 10.21: Poster

Monday, September 5, 2022, 18:00–20:00, P2

Influence of Twin Boundaries on the Mechanical Behavior of Nanowires Subjected to Bending — •Saba Khadivianazar1,2, Jonas Schickel1, and Erik Bitzek1,21Friedrich-Alexander-Universität Erlangen-Nürnberg , Chair of General Materials Properties, Institute I, Martensstr. 5, Erlangen 91058, Germany — 2Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1 , Düsseldorf 40237, Germany

Metallic nanowires (NWs) display superior mechanical properties compared to their bulk counterparts and are regarded as promising building blocks for a variety of application such as touchscreen displays, flexible and stretchable electronic devices. Recently it has been observed that the multi twinned nanowires show higher yield stress and enhanced localized deformation compared to the single crystalline nanowires. Despite the importance of characterizing the deformation behavior under bending loads, most studies of metallic twinned NWs to date have been performed under tensile testing conditions.

Here we present recent results of atomistic simulations on bi-crystalline twinned nanowires under bending. Atomistic simulations allow for controlled variation of the material, size, morphology, the location of the twin boundary (TB), and loading conditions. We show that the presence of a TB not only influences the plastic deformation but also affects the stress state of nanowires. The critical resolved shear stress for dislocation nucleation was determined and the interactions of dislocations with TBs was studied in detail for varying twin boundary location and bending directions.

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