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

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Niekiel F, Spiecker E, Bitzek E
Zeitschrift: Journal of the Mechanics and Physics of Solids
Verlag: Elsevier
Jahr der Veröffentlichung: 2015
Band: 84
Seitenbereich: 358-379
ISSN: 0022-5096


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.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bitzek, Erik Prof. Dr.-Ing.
Professur für Werkstoffwissenschaften (Simulation und Werkstoffeigenschaften)
Niekiel, Florian
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


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


Forschungsbereiche

A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials
A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

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.

BibTeX: 

Zuletzt aktualisiert 2019-29-05 um 15:08