Kohlrausch exponent of amorphous Zr{sub 65}Al{sub 7.5}Cu{sub 27.5} determined by anelastic relaxation measurements
- Institut fuer Physik, Universitaet Augsburg, D-86135 Augsburg (Germany)
Anelastic relaxations of amorphous Zr{sub 65}Al{sub 7.5}Cu{sub 27.5} have been studied in the range of the glass transition and in the supercooled liquid. Applying a force step function, an anelastic aftereffect of the form exp({ital t}/{tau}){sup {beta}} (Kohlrausch{endash}Williams{endash}Watts function) is expected with an exponent {beta}{lt}1. From the measurement a value of {beta}=0.67{plus_minus}0.03 is determined at {ital T}{sub {ital g}} which confirms the empirical correlation between the fragility index {ital m} (36.4 for Zr{sub 65}Al{sub 7.5}Cu{sub 27.5}) and {beta}, established by B{umlt o}hmer {ital et} {ital al}. This result is another indication for the metallic glass Zr{sub 65}Al{sub 7.5}Cu{sub 27.5} being a rather strong glass former. Furthermore, a strong increase in {beta} just above {ital T}{sub {ital g}} is found and is interpreted in the framework of a cluster model. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 389253
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 21 Vol. 69; ISSN APPLAB; ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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