In situ frustum indentation of nanoporous copper thin films

Liu, Ran; Pathak, Siddhartha; Mook, William M.; Baldwin, J. Kevin; Mara, Nathan; Antoniou, Antonia

doi:10.1016/j.ijplas.2017.07.005

Title: In situ frustum indentation of nanoporous copper thin films

Journal Article · Mon Jul 24 00:00:00 EDT 2017 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2017.07.005· OSTI ID:1416294

Liu, Ran ^[1]; Pathak, Siddhartha ^[2]; Mook, William M. ^[3]; Baldwin, J. Kevin ^[4]; Mara, Nathan ^[4]; Antoniou, Antonia ^[1]

Georgia Inst. of Technology, Atlanta, GA (United States). The Woodruff School of Mechanical Engineering
Univ. of Nevada, Reno, NV (United States). Chemical and Materials Engineering
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Mechanical properties of thin films are often obtained solely from nanoindentation. At the same time, such measurements are characterized by a substantial amount of uncertainty, especially when mean pressure or hardness are used to infer uniaxial yield stress. In this paper we demonstrate that indentation with a pyramidal flat tip (frustum) indenter near the free edge of a sample can provide a significantly better estimate of the uniaxial yield strength compared to frequently used Berkovich indenter. This is first demonstrated using a numerical model for a material with an isotropic pressure sensitive yield criterion. Numerical simulations confirm that the indenter geometry provides a clear distinction of the mean pressure at which a material transitions to inelastic behavior. The mean critical pressure is highly dependent on the plastic Poisson ratio ν^p so that at the 1% offset of normalized indent depth, the critical pressure p_m^c normalized to the uniaxial yield strength σ⁰ is 1 < p_m^c/σ⁰ < 1.3 for materials with 0 < ν^p < 0.5. Choice of a frustum over Berkovich indenter reduces uncertainty in hardness by a factor of 3. These results are used to interpret frustum indentation experiments on nanoporous (NP) Copper with struts of typical diameter of 45 nm. An estimate of the yield strength of NP Copper is obtained 230 MPa < σ⁰ < 300 MPa. Edge indentation further allows one to obtain in-plane strain maps near the critical pressure. Finally, comparison of the experimentally obtained in-plane strain maps of NP Cu during deformation and the strain field for different plastic Poisson ratios suggest that this material has a plastic Poisson ratio of the order of 0.2–0.3. However, existing constitutive models may not adequately capture post-yield behavior of NP metals.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Georgia Institute of Technology, Atlanta, GA (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: AC52-06NA25396; CMMI-1351705

OSTI ID:: 1416294

Alternate ID(s):: OSTI ID: 1549660

Report Number(s):: LA-UR-17-27378

Journal Information:: International Journal of Plasticity, Vol. 98; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 15 works

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