On the origin of the anomalous compliance of dealloying-derived nanoporous gold

SCRIPTA MATERIALIA

卷:130

Article

Ngo, B. -N. D.¹  Roschning, B.²  Albe, K.³  Weissmueller, J.^1,2  Markmann, J.^1,2 

[1] Helmholtz Zentrum Geesthacht, Inst Mat Res Mat Mech, Geesthacht, Germany

[2] Hamburg Univ Technol, Inst Mat Phys & Technol, Hamburg, Germany

[3] Tech Univ Darmstadt, Inst Mat Sci, Div Mat Modeling, Darmstadt, Germany

关键词: Nanoporous;    Molecular dynamics;    Finite element modeling;    Elasticity of nanomaterials;    Surface effects;   

DOI  :  10.1016/j.scriptamat.2016.11.006

来源: Elsevier

【 摘 要 】

The origin of the anomalously compliant behavior of nanoporous gold is studied by comparing the elasticity obtained from molecular dynamics (MD) and finite element method (FEM) simulations. Both models yield a compliance, which is much higher than the predictions of the Gibson-Ashby scaling relation for metal foams and thus confirm the influence of other microstructural features besides the porosity. The linear elastic FEM simulation also yields a substantially stiffer response than the MD simulation, which reveals that nonlinear elastic behavior contributes decisively to the anomalous compliance of nanoporous gold at small structure size. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

Free