Nanometre-scale defects in shear bands in a metallic glass

被引：208

作者：

Li, J ^{[1
]}

Spaepen, F

Hufnagel, TC

机构：

[1] Johns Hopkins Univ, Dept Mat Sci & Engn, Baltimore, MD 21218 USA

[2] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 2002年 / 82卷 / 13期

关键词：

D O I：

10.1080/01418610210152792

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have compared the structure of shear bands with that of undeformed regions of a metallic glass. Using quantitative high-resolution electron microscopy, we observed void-like defects, approximately 1 nm in diameter and at a concentration of one in 100 nm(3), which are generated as a result of plastic deformation in the shear bands. These defects may result from the coalescence of excess free volume upon cessation of the flow. By comparing the free energy of the shear band containing uniformly distributed free volume with that of the relaxed shear band with voids present, we show that the coalescence is thermodynamically possible.

引用

页码：2623 / 2630

页数：8

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