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Probing Shear-Band Initiation in Metallic Glasses

2011; American Physical Society; Volume: 107; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.107.185502

1092-0145

David Klaumünzer, A. Lazarev, R. Maaß, Florian H. Dalla Torre, Alexei Vinogradov, Jorg F. Löffler,

Theoretical and Computational Physics

In situ acoustic emission monitoring is shown to capture the initiation of shear bands in metallic glasses. A model picture is inferred from stick-slip flow in granular media such that the origin of acoustic emission is attributed to a mechanism of structural dilatation. By employing a quantitative approach, the critical volume change associated with shear-band initiation in a metallic glass is estimated to be a few percent only. This result agrees with typical values of excess free volume found in the supercooled liquid regime near the glass transition temperature.