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Abstract
An approach is developed using differential scanning calorimetry with the characteristics of relaxation to exhibit a glass transition under high pressure in metallic glass, specifically, the glass transition in ${\mathrm{Zr}}_{46.75}{\mathrm{Ti}}_{8.25}{\mathrm{Cu}}_{7.5}{\mathrm{Ni}}_{10}{\mathrm{Be}}_{27.5}$ bulk glass-forming alloy with a very stable supercooled liquid state. Through the approach, we obtain an averaged increase of the glass transition temperature with a pressure of 5.6 K/GPa. Based on free volume theory, the formation volume $(\ensuremath{\Delta}{V}_{f})$ of $6.5\ifmmode\pm\else\textpm\fi{}0.5{\AA{}}^{3}$ and migration volume $(\ensuremath{\Delta}{V}_{m})$ of $6.5\ifmmode\pm\else\textpm\fi{}0.5{\AA{}}^{3}$ for defect diffusion, which is related to pressure-dependent free volume change, are derived. The results contribute to the understanding of the nature of the calorimetric glass transition and diffusion in metallic glasses.
Published Version
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