Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 3: Interfaces I: Mechanical properties

MM 3.2: Vortrag

Montag, 7. März 2016, 10:30–10:45, H39

Shear Modulus of grain boundaries in relaxed and deformation-modified states — •Lisa Neier1, Sergiy Divinski1, Anantha Padmanabhan2, and Gerhard Wilde11Institut für Materialphysik, Westfälische-Wilhelms- Universität, 48149 Münster — 2University of Hyderabad, India

A comparison of properties in materials subjected to severe plastic deformation or steady state superplastic flow shows several similarities especially with respect to the interface response to the deformation, such as grain boundary sliding events. Making use of this idea, we propose to describe the experimentally observed "high-energy" state of general high-angle grain boundaries in severely plastically deformed materials in terms of a concept of shear localization and extra free volume in the interfaces, with oblates spheroids chosen as basic sliding units.

By performing atomistic simulations of these grain boundaries their response to deformation is analysed. With special focus on shear deformation parallel to the grain boundary plane, properties, such as the local shear modulus of these grain boundaries, are calculated and compared to the properties of relaxed high angle grain boundaries.

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