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Title: Thermodynamic and topological modeling and synthesis of Cu-Zr-Ti-Ni-Based bulk metallic glasses by mechanical alloying
Authors: Bhatt, J.
Dey, G.K.
Murty, B.S.
Keywords: Boltzmann equation; Enthalpy; Entropy; Glass manufacture; Mechanical alloying; Chemical mixing enthalpy; Mansoori's approach; Multicomponent systems; Metallic glass
Issue Date: 2008
Citation: Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 39(7), 1543-1551
Abstract: In the present investigation, thermodynamic and topological concepts have been used together to understand the formation of bulk metallic glasses. The article attempts to develop a parameter that combines chemical mixing enthalpy (?H chem), mismatch entropy normalized by Boltzmann constant (?S? /kB), and configurational entropy (?S config/ R), which can be effectively used to identify the best bulk glass forming compositions in multicomponent systems. The ?Hchem for multicomponent systems has been calculated by extending the Miedema's macroscopic model, and ?S?/kB was obtained from Mansoori's approach. The iso-?Hchem, iso-?S? /kB, and iso-?Sconfig/R contours have been developed. The product of ?Hchem and ?S?/kB in the ?Sconfig /R range of 0.9 to 1.0 can be correlated strongly to glass forming ability. This has been demonstrated in the case of the quaternary Cu-Zr-Ti-Ni bulk glass forming system to determine the bulk metallic glass forming compositions. Mechanical alloying is used to prepare the bulk amorphous powder at the compositions predicted by the model in order to validate the model. � The Minerals, Metals & Materials Society and ASM International 2007.
ISSN: 10735623
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