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Effects of chemical composition on the structural relaxation in ternary Zr-Cu-Al bulk glassy alloys studied by EXAFS and positron annihilation techniques.

Published online by Cambridge University Press:  10 March 2011

A Ishii ,
S Mineno ,
A Iwase ,
Y Yokoyama ,
T J. Konno  and
F Hori
A Ishii
Affiliation:
Department of Materials Science, Osaka Pref. Univ., 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
S Mineno
Affiliation:
Department of Materials Science, Osaka Pref. Univ., 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
A Iwase
Affiliation:
Department of Materials Science, Osaka Pref. Univ., 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Y Yokoyama
Affiliation:
Institute for Materials Research, Tohoku Univ., 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
T J. Konno
Affiliation:
Institute for Materials Research, Tohoku Univ., 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
F Hori
Affiliation:
Department of Materials Science, Osaka Pref. Univ., 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
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Abstract

Mechanical properties and thermal stability of bulk glassy alloys depend on their chemical composition ratios, although their detailed local structures especially around free volume have not been clarified yet. In order to know the origin of property dependence on alloy composition in Zr-Cu-Al ternary bulk glassy alloys in a view point of atomic scale, positron annihilation lifetime, coincidence Doppler broadening (CDB) and EXAFS (extended X-ray absorption fine structure) measurements have been employed for eutectic Zr50Cu40Al10 and hypoeutectic Zr60Cu30Al10 bulk glassy alloys before and after structural relaxation by annealing below glass transition temperature Tg.

The result of CDB experiment, which represents the electron momentum distribution around free volume, shows that significant atomic reordering around free volume does not take place by the annealing in each alloy. Besides, CDB ratio profiles for each alloy suggest that the fraction of Zr atom around free volume does not match the chemical composition of each alloy system. Change in positron lifetime, which is proportional to the size of free volume, during annealing for hypoeutectic alloy almost remains unchanged.

Keywords

amorphousannealingZr
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1300: Symposium U – Bulk Metallic Glasses and their Applications , 2011 , mrsf10-1300-u09-38
Copyright
Copyright © Materials Research Society 2011

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References

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