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Thermodynamics of The Pd43Ni10Cu27P20 Bulk Metallic Glass Forming Alloy

Published online by Cambridge University Press:  01 February 2011

Masahiro Kuno ,
Ludi A. Shadowspeaker ,
Jan Schroers  and
Ralf Busch
Masahiro Kuno
Affiliation:
Department of Mechanical Engineering, Oregon State University, Corvallis Oregon 97331
Ludi A. Shadowspeaker
Affiliation:
Department of Mechanical Engineering, Oregon State University, Corvallis Oregon 97331
Jan Schroers
Affiliation:
Keck Laboratory of Engineering Materials, California institute of technology, Pasadena, CA 91125
Ralf Busch
Affiliation:
Department of Mechanical Engineering, Oregon State University, Corvallis Oregon 97331
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Abstract

The thermodynamics of the bulk metallic glass forming Pd43Ni10Cu27P20 alloy were investigated with differential scanning calorimetry (DSC). The specific heat capacity of the undercooled liquid with respect to the crystalline mixture was measured in the DSC simultaneously with the enthalpy of crystallization over the entire supercooled liquid region. The enthalpy, entropy, and Gibbs free energy change between the liquid and the crystalline mixture was determined from the specific heat capacity data. The calculated enthalpy function closely matched the enthalpies of crystallization that were measured in the DSC, which verifies the validity of the thermodynamic model used. A small Gibbs free energy difference between undercooled liquid and crystalline mixture was found for decreasing temperature in Pd43Ni10Cu27P20 when compared to other glass forming alloys. This reflects a small driving force for crystallization when undercooling this alloy and is the main contributing factor for its high glass forming ability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 806: Symposium MM – Amorphous and Nanocrystalline Metals , 2003 , MM5.2
Copyright
Copyright © Materials Research Society 2004

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References

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