Energy model for the Zr-based metallic glass alloy melt with clusters |
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Authors: | Yang YuanSheng Li HuiQiang Tong WenHui |
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Institution: | Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China |
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Abstract: | An energy model for the melt of bulk metallic glass (BMG) with clusters was established, the Gibbs free energy and interfacial
energy for the Zr-Al-Ni ternary alloy melt with Zr2Ni clusters were calculated, and the effects of the clusters on the Gibbs free energy, interfacial energy and nucleation rate
were analyzed. The results showed that the existence of the clusters in the Zr-Al-Ni ternary alloy melt enables the Gibbs
free energy to decrease in the composition range where bulk metallic glass forms easily, makes the interfacial energy increase
and changes the distribution of the interfacial energy with the alloy composition. Because of the clusters in the melt, the
Gibbs free energy of the Zr66Al8Ni26 alloy melt decreases about 0.3–1 kJ/mol and the interfacial energy between the melt and crystal nucleus increases about 0.016
J/m2. The nucleation rate of the undercooled Zr66Al8Ni26 alloy melt decreases evidently under the influence of the clusters on Gibbs free energy and the interfacial energy, and the
maximum of the nucleation rate in the melt with the Zr2Ni clusters is only about 107 mol−1·s−1.
Supported by the National Natural Science Foundation of China (Grant No. 50395100) |
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Keywords: | bulk metallic glass cluster Gibbs free energy interfacial energy |
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