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Thermodynamic and kinetic fragilities of Mg-based bulk metallic glass-forming liquids

Published online by Cambridge University Press:  31 January 2011

H. Ma  and
H-J. Fecht
H. Ma*
Affiliation:
Institute of Micro and Nanomaterials, Faculty of Engineering, Ulm University, 89081 Ulm, Germany
H-J. Fecht
Affiliation:
Institute of Micro and Nanomaterials, Faculty of Engineering, Ulm University, 89081 Ulm, Germany; and Research Center Karlsruhe, Institute of Nanotechnology, 76021 Karlsruhe, Germany
*
a)Address all correspondence to this author. e-mail: han.ma@uni-ulm.de
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Abstract

The thermodynamic and kinetic fragilities of two near-eutectic Mg-based bulk metallic glass (BMG)-forming liquids, Mg61Cu28Gd11 and Mg59.5Cu22.9Ag6.6Gd11, were investigated using high-precision differential scanning calorimeter (DSC). The thermodynamic fragility denoted as F3/4 was determined by evaluating the temperature dependence of the excess entropy Sex. The heating rate dependence of the relaxation time at the glass transition temperature was investigated to measure the kinetic fragility. A positive correlation between the thermodynamic and kinetic fragilities could be established in Mg-based BMG-forming liquids on the basis of Adam-Gibbs equation in contrast to a number of other BMGs.

Keywords

AlloyAmorphousCalorimetry
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 10 , October 2008 , pp. 2816 - 2820
Copyright
Copyright © Materials Research Society 2008

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