Temperature rise from fracture in a Zr-based metallic glass

A. Das, P. Kagebein, S. Küchemann, R. Maaß

Research output: Contribution to journalArticlepeer-review

Abstract

Inhomogeneous serrated plastic flow and the subsequent fracture of a Zr-based metallic glass are probed by high-speed in-situ pyrometry and in-situ acoustic emission. Whilst the temperature rise during serrated flow remains below the detection threshold of 300 °C, fracture is accompanied by ΔT of up to approximately 600 °C within less than 100 μs. Heating rates during fracture are up to 107 K/s, for which a dynamic glass transition temperature can be determined. A continuous wavelet analysis of the acoustic-emission pulse from fracture reveals an intermittent crack propagation with phases of intense activity of ca. 5-15 μs. These findings quantify the final stage of a shear-band-to-crack transition in terms of time scales and temperature excursions, the latter of which remains well below the melting temperature of the material in this study.

Original languageEnglish (US)
Article number261905
JournalApplied Physics Letters
Volume112
Issue number26
DOIs
StatePublished - Jun 25 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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