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Correlation Between Thermodynamic and Kinetic Properties of Glass-Forming Liquids

Published online by Cambridge University Press:  01 February 2011

Oleg N. Senkov  and
Daniel B. Miracle
Oleg N. Senkov
Affiliation:
oleg.senkov@wpafb.af.mil, UES, Inc., Materials and Processes Division, 4401 Dayton-Xenia Rd., Dayton, OH, 45432-1894, United States, 937-255-1320, 937-656-7292
Daniel B. Miracle
Affiliation:
daniel.miracle@wpafb.af.mil, Air Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson AFB, OH, 45433, United States
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Abstract

Correlations between three characteristic temperatures: glass transition, Tg , Kauzmann, Tk , and Vogel-Fulcher-Tammann, To , were identified from the analysis of more than 60 metallic and non-metallic glass-forming materials. It was found that Tg ≥ Tk ≥ To and Tk is the geometric mean of Tg and To . The relation Tk ≥ To indicates that the excess total entropy of a super-cooled liquid ΔS approaches zero at a higher temperature than the configurational entropy ΔSconf , and such behavior was explained by the stronger temperature dependence of the excess vibrational entropy of the liquid, ΔSvib , than that of the corresponding glass, . A relationship between the fragility index m, reduced excess heat capacity ΔCp (Tg )/Sm , and reduced glass transition temperature, Trg , was identified using the found correlation between the characteristic temperatures.

Keywords

amorphouskineticsliquid

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1048: Symposium Z – Bulk Metallic Glasses–2007 , 2007 , 1048-Z02-10
Copyright
Copyright © Materials Research Society 2008

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