Room temperature stress relaxation in nanocrystalline Ni measured by micropillar compression and miniature tension

Mohanty, Gaurav; Wehrs, Juri; Boyce, Brad L.; Taylor, Aidan; Hasegawa, Madoka; Philippe, Laetitia; Michler, Johann

doi:10.1557/jmr.2016.101

Room temperature stress relaxation in nanocrystalline Ni measured by micropillar compression and miniature tension

Journal Article · Fri Apr 01 00:00:00 EDT 2016 · Journal of Materials Research

DOI:https://doi.org/10.1557/jmr.2016.101· OSTI ID:1870473

Mohanty, Gaurav ^[1]; Wehrs, Juri ^[1]; Boyce, Brad L. ^[2]; Taylor, Aidan ^[1]; Hasegawa, Madoka ^[1]; Philippe, Laetitia ^[1]; Michler, Johann ^[1]

Swiss Federal Laboratories for Materials Science and Technology (Empa), Dübendorf (Switzerland)
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

In this report, we report a micropillar stress relaxation technique employing a stable displacement-controlled, in-situ scanning electron microscope indenter, and unusually large micropillars to precisely measure stress relaxation in electroplated nanocrystalline Ni thin films. The observed stress relaxation is significant under constant displacement: even well below the 0.2% offset yield strength, the stresses relax by ~4% within a minute; in the work hardening regime, stress relaxes by ~9% in 1 min. A logarithmic fit of the relaxation curves is consistent with an Arrhenius thermal activation of plasticity and suggests an activation volume in the vicinity of ~10 b³. The apparent and effective activation volumes diverge at lower strains, particularly in the “elastic” regime. These measurements are compared to similar measurements performed on free-standing thin film tensile coupons. Both methods yield similar results, thereby validating the applicability of pillar compression to capture time-dependent plasticity. To our knowledge, these are the first micropillar stress relaxation experiments on metals ever reported.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0003525

OSTI ID:: 1870473

Report Number(s):: SAND2022-3828J; 704786

Journal Information:: Journal of Materials Research, Journal Name: Journal of Materials Research Journal Issue: 8 Vol. 31; ISSN 0884-2914

Publisher:: Materials Research SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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