Diffusion in Metallic Glass-Forming Systems: A Description of the Kink Behavior Observed in the Temperature Dependence

Abstract:

The temperature dependence of the diffusion coefficient in metallic glass-forming systems do not follow the Arrhenius behavior over a wide temperature range. Instead, it exhibits a kink behavior at around the glass transition temperature. Some researchers associate this behavior to the difference in the diffusion mechanism operating in the glassy and the supercooled liquid state, whereas others do not support this view. In addition, usually, the temperature dependence of the diffusion coefficient is analyzed by splitting the temperature range into two regions, above and below the glass transition temperature. In the present study, we developed an analytical theory that describes the continuous variation of the diffusion coefficient across a temperature where the kink behavior is observed. According to the theory, the kink behavior arises from the freezing of free volume available for diffusion by lowering the temperature. A connection to the vacancy mechanism of diffusion has been also pointed out.

• Periodical: Solid State Phenomena (Volume 353)
• Pages: 143-148
• DOI: https://doi.org/10.4028/p-goE935
• Online since: December 2023
• Authors: Masaru Aniya*, Masahiro Ikeda
• Keywords: Diffusion, Free Volume, Freezing of Free Volume, Glass-Forming Liquids, Metallic Glass, Vacancy Mechanism, Viscosity

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