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Thermodynamics and kinetics of the Mg65Cu25Y10 bulk metallic glass forming liquid

Busch, R. and Liu, W. and Johnson, W. L. (1998) Thermodynamics and kinetics of the Mg65Cu25Y10 bulk metallic glass forming liquid. Journal of Applied Physics, 83 (8). pp. 4134-4141. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:BUSjap98

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Abstract

The thermodynamics and kinetics of the bulk metallic glass forming Mg65Cu25Y10 liquid were investigated using differential scanning calorimetry and three-point beam bending. The experiments lead to the determination of the thermodynamic functions as well as the viscosity of the supercooled liquid. The viscosity shows a temperature dependence, which is consistent with that of a strong glass similar to Zr–Ti–Cu–Ni–Be bulk metallic glasses or sodium silicate glasses. This contrasts with more fragile conventional metallic glass formers or pure metals. The relatively weak temperature dependence of the thermodynamic functions of the supercooled liquid is related to these sluggish kinetics in the supercooled liquid. Entropy, viscosity, and kinetic glass transition are compared in the frameworks of the fragility concept and the Adam–Gibbs theory. Strong liquid behavior retards the formation of crystals kinetically and thermodynamically.


Item Type:Article
Additional Information:©1998 American Institute of Physics. (Received 8 December 1997; accepted 12 January 1998) This work was supported by the U.S. Department of Energy (Grant No. DEFG-03-86ER45242). Partial support for R. Busch was provided by the Alexander von Humboldt Foundation via the Feodor Lynen Program.
Subject Keywords:METALLIC GLASSES; YTTRIUM ALLOYS; COPPER ALLOYS; MAGNESIUM ALLOYS; THERMODYNAMIC PROPERTIES; DIFFERENTIAL THERMAL ANALYSIS; CALORIMETRY; VISCOSITY; ENTROPY; SPECIFIC HEAT; liquid alloys; thermal analysis; glass transition
Record Number:CaltechAUTHORS:BUSjap98
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BUSjap98
Alternative URL:http://dx.doi.org/10.1063/1.367167
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1902
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:23 Feb 2006
Last Modified:26 Dec 2012 08:46

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