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Yttrium Enhanced Glass-Forming Ability of Zr-Based Metallic Glasses

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Title Yttrium Enhanced Glass-Forming Ability of Zr-Based Metallic Glasses
 
Creator Patel, Margi K
Upadhyay, Deepak
Lad, Kirit N
Pratap, Arun
 
Subject Gibbs free energy difference
Bulk metallic glass
glass forming ability
rare earth element
electronegativity difference
 
Description 803-810
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.
 
Date 2021-12-17T09:18:31Z
2021-12-17T09:18:31Z
2021-12
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscair.res.in/handle/123456789/58634
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.59(12) [December 2021]