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<p>This study systematically investigates the relationship between glass-forming ability (GFA), fragility index, and free volume in Cu–Zr–Al bulk metallic glasses (BMGs) doped with Si, Er, and Y. The research unveils correlations among the fragility index, free volume, and GFA in these BMGs by employing thermal analysis at varying heating rates. Non-isothermal differential scanning calorimetry (DSC) was employed to examine thermal stability and characteristic temperatures of (Cu<sub>50</sub>Zr<sub>43</sub>Al<sub>7</sub>)<sub>100-x</sub>Si<sub>x</sub>, (Cu<sub>50</sub>Zr<sub>43</sub>Al<sub>7</sub>)<sub>100-y</sub>Er<sub>y</sub>, and (Cu<sub>50</sub>Zr<sub>43</sub>Al<sub>7</sub>)<sub>100-y</sub>Y<sub>y</sub> (<i>x</i> = 0, 0.5, 1, 1.5, 2 at.% and <i>y</i> = 0, 2, 4, 6 at.%) BMGs, highlighting Si's enhancement of thermal stability and GFA and the significant improvement in both factors by adding 2% Y and Er. Moreover, a direct linear correlation between the fragility index and GFA in Cu–Zr–Al BMGs is observed, while free volume calculations shed light on the correlation between free volume alterations and GFA on the Cu-based BMGs, contributing to a deeper comprehension of their interrelation.</p>

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Correlation between glass-forming ability, fragility, and free volume of copper-based bulk metallic glasses

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Mehdi Malekan,
  • Alireza Jalali

摘要

This study systematically investigates the relationship between glass-forming ability (GFA), fragility index, and free volume in Cu–Zr–Al bulk metallic glasses (BMGs) doped with Si, Er, and Y. The research unveils correlations among the fragility index, free volume, and GFA in these BMGs by employing thermal analysis at varying heating rates. Non-isothermal differential scanning calorimetry (DSC) was employed to examine thermal stability and characteristic temperatures of (Cu50Zr43Al7)100-xSix, (Cu50Zr43Al7)100-yEry, and (Cu50Zr43Al7)100-yYy (x = 0, 0.5, 1, 1.5, 2 at.% and y = 0, 2, 4, 6 at.%) BMGs, highlighting Si's enhancement of thermal stability and GFA and the significant improvement in both factors by adding 2% Y and Er. Moreover, a direct linear correlation between the fragility index and GFA in Cu–Zr–Al BMGs is observed, while free volume calculations shed light on the correlation between free volume alterations and GFA on the Cu-based BMGs, contributing to a deeper comprehension of their interrelation.