Shear stress induced reduction of glass transition temperature in a bulk metallic glass

被引：24

作者：

Jin, H ^{[1
]}

Wen, J ^{[1
]}

Lu, K ^{[1
]}

机构：

[1] Chinese Acad Sci, Met Res Inst, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China

来源：

ACTA MATERIALIA | 2005年 / 53卷 / 10期

基金：

中国国家自然科学基金;

关键词：

metallic glasses; enthalpy recovery; glass transition; pressure; stress; free volume; activation volume;

D O I：

10.1016/j.actamat.2005.03.015

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In contrast to previous observations of a slight increase in glass transition temperature (T-g) under hydrostatic pressure, we report, for the first time, a drastic reduction of T-g (40 K/500 MPa) induced by shear stress in a Zr46.75Ti8.25Cu7.5Ni10.0Be27.5 bulk metallic glass, which gives rise to the experimental observation of the drastic decrease in flow temperature while a compressive stress was applied. The significant T-g reduction is attributed to a large activation volume of relaxation Delta V-t under shear stress (126 angstrom(3)), and can be quantitatively interpreted in terms of the free volume model. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3013 / 3020

页数：8

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