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MM: Fachverband Metall- und Materialphysik

MM 26: Poster session II

MM 26.33: Poster

Tuesday, March 8, 2016, 18:30–20:30, Poster B3

Surface Excess Elasticity: A First-Principles Study — •Beatrix Elsner and Stefan Müller — Hamburg University of Technology, Institute of Advanced Ceramics, Denickestr. 15, D-21073 HH

The size-dependent elastic response of nanomaterials and nanostructures with a large surface-to-volume ratio has attracted increasing attention. Yet, it remains an open question whether the presence of surfaces entails a stiffening or softening of the material [1]. The surface elastic constants–a measure for the change of surface stress with surface strain–represent a key quantity with regard to this question. In this contribution, we present a density functional theory (DFT) study of the surface energy, surface stress, and surface elastic constants of low-index fcc metal surfaces. Our calculations yield positive surface elastic constants for the (111) and (001) surfaces of gold, implying a stiffening effect.

Supported by DFG, SFB 986, project B3.

[1] Mameka, et al., Acta Materialia 76, 272 (2014).