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首页> 外文期刊>Journal of Applied Physics >Glass transition temperature of bulk metallic glasses: A linear connection with the mixing enthalpy
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Glass transition temperature of bulk metallic glasses: A linear connection with the mixing enthalpy

机译:大块金属玻璃的玻璃化温度:与混合焓的线性关系

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摘要

A linear relationship is found between the glass transition temperature T_g and the absolute value of the mixing enthalpy, |ΔH~(chem)|, for bulk metallic glass systems. The increasing (or lowering) of T_g with an admixture of metals or other elements manifests itself in the larger (or smaller) of |ΔH~(chem)| in a given system. The results indicate that the composition dependence of T_g results from the change of excess entropy (S_(ex)) during thermal excitation. The |ΔH~(chem)|, which relates to the strength of interaction among different atoms, corresponds to part of the S_(ex) at T_g [S_(ex)(T_g)]. The glass transition temperatures for Cu-Zr (Hf)-, Zr-Cu-, and La-Al-based glassy alloys are correlated with the interaction intensity between their based binary eutectic compositions, respectively.
机译:对于块状金属玻璃系统,在玻璃化转变温度T_g与混合焓的绝对值|ΔH〜(chem)|之间发现线性关系。 T_g与金属或其他元素混合的增加(或降低)表现为|ΔH〜(chem)|的较大(或更小)。在给定的系统中。结果表明,T_g的成分依赖性是由热激发过程中过量熵(S_(ex))的变化引起的。与不同原子之间的相互作用强度有关的|ΔH〜(chem)|对应于T_g [S_(ex)(T_g)]处的一部分S_(ex)。 Cu-Zr(Hf)-,Zr-Cu-和La-Al基玻璃态合金的玻璃化转变温度分别与其基于二元共晶成分之间的相互作用强度相关。

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