Probing Shear-Band Initiation in Metallic Glasses

被引：140

作者：

Klaumuenzer, D. ^{[1
]}

Lazarev, A. ^{[2
]}

Maass, R. ^{[1
]}

Torre, F. H. Dalla ^{[1
]}

Vinogradov, A. ^{[2
,3
]}

Loeffler, J. F. ^{[1
]}

机构：

[1] ETH, Dept Mat, Lab Met Phys & Technol, CH-8093 Zurich, Switzerland

[2] Togliatti State Univ, Lab Phys Strength Mat & Intelligent Diagnost Syst, Tolyatti 4455667, Russia

[3] Osaka City Univ, Dept Intelligent Mat Engn, Osaka 5588585, Japan

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 18期

基金：

瑞士国家科学基金会;

关键词：

FLOW; MECHANISM; FRICTION;

D O I：

10.1103/PhysRevLett.107.185502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：5

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