Relaxation of Free Volume in Zr50CU40Al10 Bulk Metallic Glasses Studied by Positron Annihilation Measurements

被引：25
|
作者：
Ishii, Akito [1 ]
Hori, Fuminobu [1 ]
Iwase, Akihiro [1 ]
Fukumoto, Yuka [1 ]
Yokoyama, Yoshihiko [2 ]
Konno, Toyohiko J. [2 ]
机构：
[1] Osaka Prefecture Univ, Dept Mat Sci, Sakai, Osaka 5998531, Japan
[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
MATERIALS TRANSACTIONS | 2008年 / 49卷 / 09期
关键词：
bulk metallic glass; structural relaxation; positron annihilation measurement;
D O I：
10.2320/matertrans.MAW200826
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Relaxation of free volume in Zr50CU40Al10 bulk metallic glass during isothermal annealing below T-g (glass transition temperature) has, been investigated by using positron annihilation lifetime and coincidence Doppler broadening (CDB) techniques. The mean positron lifetime decreases with increasing annealing time at each annealing temperature. The decrease in lifetime is due to shrinkage and annealing out of the free volume. The relaxation kinetics of free volume obeys the stretched exponential function (KWW: Kohlrausch-Williams-Watts law). An adjustable parameter of the KWW exponent beta depending on temperature was determined. The electron momentum distribution around free volume derived from a CDB spectrum during annealing showed no appreciable change at each temperature. These results suggest that long-range atomic diffusion and rearrangement, particularly around the free volume, do not occur essentially during relaxation below T-g. [doi: 10.2320/matertrans.MAW200826]
引用
收藏
页码：1975 / 1978
页数：4
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