Calorimetric study of β-relaxation in an amorphous alloy: An experimental technique for measuring the activation energy for shear transformation

被引：32
作者：
Lee, Jae-Chul [1 ]
机构：
[1] Korea Univ, Dept Mat Sci & Engn, Seoul 136701, South Korea
来源：
INTERMETALLICS | 2014年 / 44卷
关键词：
Intermetallics; miscellaneous; Glasses; metallic; Rapid solidification processing; Microstructure; STRUCTURAL RELAXATION; METALLIC-GLASS; DEFORMATION; DYNAMICS; FLOW;
D O I：
10.1016/j.intermet.2013.09.002
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
When loaded at cryogenic temperature under stresses below the global yield, an amorphous alloy revealed two clearly distinguishable exothermic events during heating in calorimetric experiments. These exotherms, commonly known as the alpha- and beta-relaxations, were attributed to the annealing out of two different local structures with different structural stability, presumably free volume and shear transformation zone (STZ). In this study, we introduced a simple and reliable experimental technique, which enables the evaluation of the activation energy corresponding to the beta-relaxation, E-beta. Based on experimental evidence and comparison with earlier studies, it is presumed that E-beta is directly related to the potential energy barrier to shear transformation. (C) 2013 Published by Elsevier Ltd.
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收藏
页码：116 / 120
页数：5
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