Indian Journal of Pure and Applied Physics

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


Affiliations
1 Applied Physics Department, Faculty of Technology & Engineering, The M. S. University of Baroda, Vadodara 390 001, Gujarat,, India
2 Department of Physics, Sardar Patel University, Vallabh Vidyanagar 388 120, Gujarat,, India

Thermodynamic behavior of Zr56-xCo28Al16Yx (0, 2, 7, 10) 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 has 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-doping on the thermodynamics of the alloys in the supercooled region and on the glass-forming ability of these alloys. The analytical approach has been found to give estimates of ΔG in a wide supercooled liquid region 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.
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  • Yttrium Enhanced Glass-Forming Ability of Zr-Based Metallic Glasses

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Authors

Margi K. Patel
Applied Physics Department, Faculty of Technology & Engineering, The M. S. University of Baroda, Vadodara 390 001, Gujarat,, India
Deepak Upadhyay
Applied Physics Department, Faculty of Technology & Engineering, The M. S. University of Baroda, Vadodara 390 001, Gujarat,, India
Kirit N. Lad
Department of Physics, Sardar Patel University, Vallabh Vidyanagar 388 120, Gujarat,, India
Arun Pratap
Applied Physics Department, Faculty of Technology & Engineering, The M. S. University of Baroda, Vadodara 390 001, Gujarat,, India

Abstract


Thermodynamic behavior of Zr56-xCo28Al16Yx (0, 2, 7, 10) 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 has 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-doping on the thermodynamics of the alloys in the supercooled region and on the glass-forming ability of these alloys. The analytical approach has been found to give estimates of ΔG in a wide supercooled liquid region 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.