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Mechanical properties of nanoporous gold in tension

Journal Article · · Acta Materialia
 [1];  [2];  [2]
  1. Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton School of Engineering; DOE/OSTI
  2. Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton School of Engineering

We report results of the tensile properties of nanoporous gold (NPG) as a function of the density and average ligament diameter. As-dealloyed tensile samples were thermally treated to coarsen the length scale of the NPG structure while increasing the sample density resulting from thickness reductions. The behaviors of samples with mean ligament diameters ranging from 30 to 750 nm and corresponding densities ranging from 0.30 to 0.57 that of bulk gold were examined. Digital image analysis was used to obtain ligament size histograms that were fit to the Weibull distribution. The Young's modulus was found to obey a power law, but with an exponent larger than that predicted by Gibson-Ashby scaling. The fracture behavior showed a brittle-ductile transition as a function of increasing ligament size. For samples characterized by a mean ligament diameter less than ~ 220 nm, the tensile behavior was linear elastic to sample fracture while samples with larger scale ligaments showed macroscopic yielding prior to fracture. These results are interpreted within the framework of extreme value statistics.

Research Organization:
Arizona State Univ., Tempe, AZ (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0008677
OSTI ID:
1533469
Alternate ID(s):
OSTI ID: 1419114
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 129; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (14)

Gaining new insights into nanoporous gold by mining and analysis of published images journal April 2018
On the impact of capillarity for strength at the nanoscale text January 2017
Light Gold: A Colloidal Approach Using Latex Templates journal December 2019
Mechanical properties of nanoporous gold subjected to tensile stresses in real-time, sub-microscopic scale journal June 2019
Mechanical Response of Au Foams of Varying Porosity from Atomistic Simulations journal July 2018
Molecular dynamics study on cold-welding of 3D nanoporous composite structures journal January 2018
Independent control over residual silver content of nanoporous gold by galvanodynamically controlled dealloying journal January 2018
Atomistic simulations of shock compression of single crystal and core-shell Cu@Ni nanoporous metals journal July 2019
Microstructure-sensitive mechanical properties of nanoporous gold: a molecular dynamics study journal September 2018
Skeletonization-based beam finite element models for stochastic bicontinuous materials: Application to simulations of nanoporous gold journal July 2018
Focused ion beam characterization of deformation resulting from nanoindentation of nanoporous gold journal January 2018
Pattern formation during electrochemical and liquid metal dealloying journal January 2018
Mechanical response of nanoporous metals: A story of size, surface stress, and severed struts journal January 2018
Understanding the Interdependence of Penetration Depth and Deformation on Nanoindentation of Nanoporous Silver journal December 2019

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