Rate-dependent shear-band initiation in a metallic glass

D. Tönnies, K. Samwer, P. M. Derlet, C. A. Volkert, R. Maaß

Research output: Contribution to journalArticlepeer-review

Abstract

A statistical analysis of the rate-dependent pop-in behavior during spherical nanoindentation of a metallic glass is presented. Since the first pop-in of a test corresponds to the initiation of plasticity, this method provides insights into the fundamentals of shear-banding behavior. In this study, test series with different applied loading rates reveal that the initiation of a shear band is thermally activated with a rate- and stress-dependent activation volume. We further find a spatial inhomogeneity of the elastic modulus at the micrometer scale. This long-range structural heterogeneity does not strongly correlate with the shear-band initiation stress.

Original languageEnglish (US)
Article number171907
JournalApplied Physics Letters
Volume106
Issue number17
DOIs
StatePublished - Apr 27 2015

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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