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首页> 外文期刊>Journal of Computational Methods in Sciences and Engineering >Adapting the condensation and evaporation model to the study of kinetics of phase transformations in binary metal systems
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Adapting the condensation and evaporation model to the study of kinetics of phase transformations in binary metal systems

机译：使冷凝和蒸发模型适应二元金属系统中相变动力学的研究

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摘要

A binary system in solid solution when is quenched at a temperature under the solubility limit, shows a structural instability that disappears when said system reaches equilibrium. In the process of reaching stability, a number of microstruc-tural modifications or fluctuations in concentration occur, which tend to generate a decrease in the free energy of the system. Critical fluctuations arise, prompting the association of critical size clusters, from which the growth of the phases responsible for final equilibrium is produced. Such proposal falls completely under the nucleation and growth theory where the first stage -before critical fluctuation appears, occurs at nucleation, whereas the latter stage corresponds to growth and coalescence of the clusters. The evaporation and condensation theory has been adapted so that the process of phase transformation is simulated while considering different evolution pathways from solid solution to the phase of equilibrium. Because the nucleation phase is energetically unstable, it is characterized by each cluster in that stage, while every cluster in the metastable or stable growth phase is grouped via the corresponding transformed fraction, which includes every metastable or stable cluster formed for a given aging time and temperature, thus allowing phase transformation to be expressed as one equation per phase plus the nucleation equations instead of an equation per cluster of different size. This paper expands on the calculation of the problem, determining the effect of the different parameters affecting phase kinetics in the Fe-C system for very low concentrations of C.
机译：当在低于溶解度极限的温度下淬灭时，固溶体中的二元体系显示出结构不稳定性，该体系不稳定性在所述体系达到平衡时消失。在达到稳定性的过程中，会发生许多微观结构的变化或浓度的波动，这往往会导致系统自由能的降低。出现临界波动，促使临界尺寸簇相关联，由此产生负责最终平衡的相的增长。这样的提议完全落入成核和生长理论，即在出现临界波动之前的第一阶段发生在成核过程中，而后期则对应于簇的生长和聚结。蒸发和凝结理论已经进行了调整，以便模拟相变过程，同时考虑从固溶体到平衡相的不同演化途径。因为成核相在能量上是不稳定的，所以它以该阶段的每个簇为特征，而亚稳态或稳定生长阶段的每个簇都通过相应的转化部分进行分组，其中包括在给定的老化时间和形成的每个亚稳态或稳定的簇。温度，因此可以将相变表示为每相一个方程式加上成核方程式，而不是每个大小不同的簇的方程式。本文扩展了问题的计算，确定了在非常低的C浓度下，影响Fe-C系统中相动力学的不同参数的影响。

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