Mechanical properties of nanoporous gold in tension

Badwe, Nilesh; Chen, Xiying; Sieradzki, Karl

doi:10.1016/j.actamat.2017.02.040

Mechanical properties of nanoporous gold in tension

Journal Article · Thu Feb 16 00:00:00 EST 2017 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2017.02.040· OSTI ID:1533469

Badwe, Nilesh ^[1]; Chen, Xiying ^[2]; Sieradzki, Karl ^[2]

Arizona State Univ., Tempe, AZ (United States). Ira A. Fulton School of Engineering; DOE/OSTI
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.

View Accepted Manuscript (DOE)

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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Mechanical properties of nanoporous gold in tension

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