Abstract
The advent of bulk metallic glasses (BMG) has opened lot of scope of wide range of applications for this class of amorphous materials. Thermodynamics plays a very important role in glass formation in multicomponent metallic alloys. BMG’s can be synthesized with relatively lower cooling rate with ease now. However, the glass formation in these systems seems to depend on quite a few parameters like enthalpy of melting, reduced glass transition temperature, under cooling. In present paper, we have studied the glass forming ability of Pd-based metallic glasses using theoretically determined Gibbs free energy difference (ΔG), between the supercooled liquid and the corresponding crystalline phase, and the critical cooling rate (R c). Time–temperature-transformation (TTT) diagrams were constructed to calculate R c using Uhlmann and Davies formulation. Different theoretical expressions of ΔG are incorporated in nucleation and growth equations to find R c from TTT diagram. The results obtained theoretically by Dhurandhar et al. expression of ΔG, assuming hyperbolic variation of specific heat difference (ΔC p), were found to be in excellent agreement with experimental data for different Pd-based systems.
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Acknowledgements
One of the authors (Sonal Prajapati) is grateful to Department of Science and Technology (DST), Govt. of India, for providing financial assistance under the DST-INSPIRE fellowship scheme. Supriya Kasyap is grateful to the University Grant Commission (UGC), New Delhi for providing the financial support under Research Fellowship in Science for Meritorious Students (RFSMS) scheme.
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The present article is based on the lecture presented at SATAC2014 conference in Dhanbad—India on 15–17 December, 2014.
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Prajapati, S.R., Kasyap, S. & Pratap, A. Effect of driving force of crystallization on critical cooling rate for Pd-based metallic glasses. J Therm Anal Calorim 127, 2083–2091 (2017). https://doi.org/10.1007/s10973-016-5824-9
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DOI: https://doi.org/10.1007/s10973-016-5824-9