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Title of Journal: Bull Mater Sci

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Abbravation: Bulletin of Materials Science

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Indian Academy of Sciences

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DOI

10.1016/0002-9394(82)90246-X

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0973-7669

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A thermodynamic approach towards glassforming abi

Authors: SONAL R PRAJAPATI SUPRIYA KASYAP ARUN PRATAP
Publish Date: 2015/12/03
Volume: 38, Issue: 7, Pages: 1693-1698
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Abstract

A quantitative measure of the stability of a glass as compared to its corresponding crystalline state can be obtained by calculating the thermodynamic parameters such as the Gibbs free energy difference ΔG entropy difference ΔS and the enthalpy difference ΔH between the supercooled liquid and the corresponding crystalline phase ΔG is known as the driving force of crystallization The driving force of crystallization ΔG provides very important information about the glassforming ability GFA of metallic glasses MGs Lesser the driving force of crystallization more is the GFA The ΔG varies linearly with the critical size d c According to Battezzati and Garonne the parameter γ = 1−ΔH x /ΔH m/1−T x /T m in the expression for ΔG should be a constant ie 08 but its uniqueness is not observed for all MGs The thermal stability of various alloy compositions is studied by their undercooled liquid region ΔT = T x −T g Large ΔT x implies greater stability against crystallization of the amorphous structure Other GFA parameters are also calculated and correlated with critical size d c

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