Thermodynamic basis for cluster kinetics: Prediction of the fragility of marginal metallic glass-forming liquids.
Thermodynamic basis for cluster kinetics: Prediction of the fragility of marginal metallic glass-forming liquids.
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DOI：
10.1021/jp063628q
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发表时间：
2006-11
期刊：
影响因子：
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通讯作者：
Lina Hu;X. Bian;X. Qin;Y. Yue;Yan Zhao;Caidong Wang
中科院分区：
文献类型：
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作者：
Lina Hu;X. Bian;X. Qin;Y. Yue;Yan Zhao;Caidong Wang
由于在实验时间窗口内的边缘金属玻璃（MMG）的过冷区域的不可访问性，我们研究了液相线温度以上的集群动力学，T1，获得信息的MMG系统的脆弱性。用双序参量模型讨论了MMG液体中局域有序结构稳定性的热力学基础。发现团簇的Arrhenius活化能Δ h与合金的化学混合焓Δ H（化学）成正比。MMG形成液体的脆性可以通过绝对Δ H（化学）值与玻璃化转变温度Tg的比率来描述。快速凝固过程中玻璃化的方式是本文提出的数据与关于Δ h和液体脆性之间关系的双序参数模型预测之间的差异的一个重要因素。
Due to the inaccessibility of the supercooled region of marginal metallic glasses (MMGs) within the experimental time window, we study the cluster kinetics above the liquidus temperature, Tl, to acquire information on the fragility of the MMG systems. The thermodynamic basis for the stability of locally ordered structure in the MMG liquids is discussed in terms of the two-order-parameter model. It is found that the Arrhenius activation energy of clusters, Deltah, is proportional to the chemical mixing enthalpy of alloys, DeltaH(chem). Fragility of the MMG forming liquids can be described by the ratio of the absolute DeltaH(chem) value to the glass transition temperature, Tg. The manner of vitrification during rapid solidification is an important factor for the discrepancy between the data presented in this paper and the prediction of the two-order-parameter model concerning the relation between Delta h and the liquid fragility.