Thermodynamic Behaviour of Bulk Metallic Glasses

Journal Article · Tue Jun 29 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3466545· OSTI ID:21415252

Singh, P K; Dubey, K S ^[1]

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1. Department of Applied Physics, Institute of Technology, Banaras Hindu University, Varanasi-221005 (India)

The thermodynamics and kinetics of glass forming melts are essential parameters for understanding the glass forming ability of materials. The Gibbs free energy difference ({Delta}G) between undercooled liquid and corresponding equilibrium solid plays an important role in nucleation and growth processes. Due to high thermal stability of undercooled melts of BMG glass formers the experimental data of thermodynamical parameters of bulk metallic melts are available over a wide range of undercooling and it is very interesting to study the thermodynamics of undercooled melts of BMGs. The aim of present work is to study {Delta}G of zirconium based BMG using an expression based on Taylor's series expansion. The enthalpy difference ({Delta}H) and entropy difference ({Delta}S) between the undercooled liquid and corresponding equilibrium solid phases is also studied. The importance of the Kauzmann temperature has also been discussed. The study is made for Zr{sub 58.5}{sup -} Cu{sub 15.6}Ni{sub 12.8}Al{sub 10.3}Nb{sub 2.8} in the temperature range T{sub m} to T{sub g}, where T{sub m} and T{sub g} are the melting and glass transition temperatures respectively. An attempt is also made to study the glass forming ability of BMGs.

• OSTI ID: 21415252
• Journal Information: AIP Conference Proceedings, Vol. 1249, Issue 1; Conference: NCTP-09: 5. national conference on thermophysical properties, Baroda (India), 7-9 Oct 2009; Other Information: DOI: 10.1063/1.3466545; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM COMPOUNDS
COPPER COMPOUNDS
ENTHALPY
ENTROPY
EQUILIBRIUM
FREE ENTHALPY
KINETICS
MATERIALS
MELTING
METALLIC GLASSES
NICKEL COMPOUNDS
NIOBIUM COMPOUNDS
NUCLEATION
SOLIDS
SPECIFIC HEAT
STABILITY
SUBCOOLING
THERMODYNAMICS
TRANSITION TEMPERATURE
ZIRCONIUM COMPOUNDS
COOLING
ENERGY
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
REFRACTORY METAL COMPOUNDS
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS