Characterizing thermodynamic properties of Ti–Cu–Ni–Zr bulk metallic glasses by hyperbolic expression
Characterizing thermodynamic properties of Ti–Cu–Ni–Zr bulk metallic glasses by hyperbolic expression
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DOI：
10.1016/j.jallcom.2012.09.105
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发表时间：
2013-02
影响因子：
6.2
通讯作者：
Peiyou Li;Gang Wang;D. Ding;Jun Shen
中科院分区：
文献类型：
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作者：
Peiyou Li;Gang Wang;D. Ding;Jun Shen
根据液态空穴理论中的比热容差ΔCp的表达式，推导出大块金属玻璃过冷液相和相应晶相的比热容差ΔCp的双曲线表达式。根据ΔCp的双曲线表达式，可以估算出过冷液相与相应晶相的吉布斯自由能差ΔG、焓差ΔH和熵差ΔS的新表达式。实验测得的Ti35.37Cu45.11Ni8.88Zr10.64和Ti37.65Cu43.25Ni9.6Zr9.5大块非晶合金的热力学参数与这些新的ΔG、ΔH和ΔS表达式吻合较好。这一发现清楚地表明，Δ Cp的双曲线表达式为阐明玻璃形成能力提供了最佳的数学模型，与先前报道的表达式相比，具有更高的准确性和更容易建模。
The hyperbolic expression of specific heat difference, ΔCp, in the supercooled liquid and corresponding crystalline phase of bulk metallic glasses can be deduced based on the expression of ΔCpin the hole theory of the liquid state. According to the hyperbolic expression of ΔCp, novel expressions of the Gibbs free energy difference, ΔG, enthalpy difference, ΔH, and entropy difference, ΔS, between the supercooled liquid and corresponding crystalline phase may be estimated. The experimentally measured thermodynamic parameters of Ti35.37Cu45.11Ni8.88Zr10.64and Ti37.65Cu43.25Ni9.6Zr9.5bulk metallic glasses exhibit a perfect fit with these novel expressions for ΔG, ΔH and ΔS. This finding clearly suggests that the hyperbolic expression of ΔCpprovides an optimum mathematical model for the elucidation of glass forming ability, with increased accuracy and ease of modeling compared to previously reported expressions.