Influence of anisotropic elasticity on the mechanical properties of fivefold twinned nanowires

Niekiel F, Spiecker E, Bitzek E (2015)

Publication Status: Published

Publication Type: Journal article

Publication year: 2015

Journal

Journal of the Mechanics and Physics of Solids Elsevier

Publisher: Elsevier

Book Volume: 84

Pages Range: 358-379

DOI: 10.1016/j.jmps.2015.08.004

Abstract

Previous atomistic simulations and experiments have shown an increased Young's modulus and yield strength of fivefold twinned (FT) face-centered cubic metal nanowires (NWs) when compared to single crystalline (SC) NWs of the same orientation. Here we report the results of atomistic simulations of SC and FT Ag, Al, Au, Cu and Ni NWs with diameters between 2 and 50 nm under tension and compression. The simulations show that the differences in Young's modulus between SC and FT NWs are correlated with the elastic anisotropy of the metal, with Al showing a decreased Young's modulus. We develop a simple analytical model based on disclination theory and constraint anisotropic elasticity to explain the trend in the difference of Young's modulus between SC and FT NWs. Taking into account the role of surface stresses and the elastic properties of twin boundaries allows to account for the observed size effect in Young's modulus. The model furthermore explains the different relative yield strengths in tension and compression as well as the material and loading dependent failure mechanisms in FTNWs. (C) 2015 Elsevier Ltd. All rights reserved.

Authors with CRIS profile

Florian Niekiel Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erdmann Spiecker Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Erik Bitzek Professur für Datenbasierte Materialmodellierung

Additional Organisation(s)

Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Exzellenz-Cluster Engineering of Advanced Materials Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

How to cite

APA:

Niekiel, F., Spiecker, E., & Bitzek, E. (2015). Influence of anisotropic elasticity on the mechanical properties of fivefold twinned nanowires. Journal of the Mechanics and Physics of Solids, 84, 358-379. https://dx.doi.org/10.1016/j.jmps.2015.08.004

MLA:

Niekiel, Florian, Erdmann Spiecker, and Erik Bitzek. "Influence of anisotropic elasticity on the mechanical properties of fivefold twinned nanowires." Journal of the Mechanics and Physics of Solids 84 (2015): 358-379.

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