Structural changes in bulk metallic glass after annealing below the glass-transition temperature

被引：82
作者：
Dmowski, W.
Fan, C.
Morrison, M. L.
Liaw, P. K.
Egami, T.
机构：
[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[2] Oak Ridge Natl Lab, Div Met & Ceram, Oak Ridge, TN 37831 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 471卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
bulk metallic glasses; neutron diffraction; structural relaxation;
D O I：
10.1016/j.msea.2006.12.137
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Small structural changes in bulk metallic glasses (BMGs) following thermal treatment below the glass-transition temperature were observed. Zr-based BMG ingots with nominal compositions of Zr52.5Cu17.9Ni14.6Al10.0Ti5.0 (at.%) were isothermally annealed at 630 K for 10-60 min in vacuum and then cooled down. Structural relaxation was indicated by enthalpy evolution during differential scanning calorimetry and by changes in micro-hardness. Atomic structure was studied using time-of-flight neutron diffraction followed by a pair-distribution function (PDF) analysis. Observed changes in the PDF could not be explained by a "free volume" annealing, but were consistent with the elimination of short and long inter-atomic distances. (C) 2007 Elsevier B.V. All rights reserved.
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页码：125 / 129
页数：5
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