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Glass Forming Ability of Zr-Based Amorphous Alloys

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The glass forming ability (GFA) of five Zr-based alloys, namely Zr62.5Al12.1Cu7.95Ni17.45, Zr63Al11.4Cu9.3Ni16.3, Zr63.5Al10.7Cu10.7Ni15.1, Zr64Al10.1Cu11.7Ni14.2, and Zr65Al8.7Cu14.4Ni11.9, is studied based on the thermodynamic parameter i.e., the Gibbs free energy difference (ΔG(T G )) between the super-cooled liquid and the corresponding crystalline phase. Two different equations of ΔG, given by Lad et al., are used and the calculated values of ΔG(T G ) are plotted against the critical dimension (Z max) to understand the relationship between the GFA and ΔG(T G ). It is found that ΔG(T G ) obtained by Lad-1 expression, shows a strong correlation with Z max (R 2 = 0.955). Other GFA parameters (γ m , α, δ, ξ, Φ, ω, ω 2, ω′, β, β′, etc.) are also calculated to understand the glass forming ability and thermal stability of metallic glasses. Among all five compositions, Zr62.5Al12.1Cu7.95Ni17.45 is found to have the best glass forming ability with ΔG(T G ) values to be 5.166 and 4.359 kJmol−1 respectively by Lad-1 and Lad-2 expression.
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Keywords: Critical Dimension (Zmax); Gibbs Free Energy Difference (ΔG); Glass Forming Ability (GFA)

Document Type: Research Article

Affiliations: Condensed Matter Physics Laboratory, Applied Physics Department, Faculty of Technology and Engineering, The Maharaja Sayajirao University of Baroda, Vadodara 390001, India

Publication date: November 1, 2016

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