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Title: Yttrium Enhanced Glass-Forming Ability of Zr-Based Metallic Glasses
Authors: Patel, Margi K
Upadhyay, Deepak
Lad, Kirit N
Pratap, Arun
Keywords: Gibbs free energy difference;Bulk metallic glass;glass forming ability;rare earth element;electronegativity difference
Issue Date: Dec-2021
Publisher: NIScPR-CSIR, India
Abstract: Thermodynamic behavior of Zr56-xCo28Al16Yx (x = 0, 2, 7, 10 at. %) bulk metallic glass-forming alloys has been studied using an analytical approach where some of the key thermodynamic quantities such as ΔH, ΔS and ΔG have been estimated using a hyperbolic temperature dependence of specific heat difference ΔCp in the supercooled liquid region. The study is focused on understanding the effect of yttrium (Y) doping on the thermodynamics of the alloys in the supercooled region and on the glass-forming ability (GFA) of these alloys. The analytical approach has been found to give estimates of ΔG in a wide supercooled liquid region which is in excellent agreement with the experimental results. Estimated ΔG values are found to be minimum for Y concentration of 7% and 10% which is consistent with the observed high GFA for these compositions. Fundamental elemental properties such as atomic size, electronegativity, the heat of mixing have been found to play an important role in governing the thermodynamics of the alloys in the supercooled liquid region.
Page(s): 803-810
ISSN: 0975-0959 (Online); 0301-1208 (Print)
Appears in Collections:IJPAP Vol.59(12) [December 2021]

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