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Analysis of solid state phase transformation kinetics: models and recipes

机译：固态相变动力学分析：模型和配方

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The progress of solid-state phase transformations can generally be subdivided into three overlapping mechanisms: nucleation, growth and impingement. These can be modelled separately if hard impingement prevails. On that basis, an overview has been given of recent numerical and analytical methods for determination of the kinetic parameters of a transformation. The treatment focuses on both isothermally and isochronally conducted transformations. To extend the range of transformations that can be described analytically, a number of more or less empirical submodels, which are compatible with experimental results, has been included in the discussion. It has been shown that powerful, flexible, analytical models are possible, once the concept of time or temperature dependent growth exponent and effective activation energy, in agreement with the existing experimental observations, has been adopted. An explicit (numerical) procedure to deduce the operating kinetic processes from experimental transformation-rate data, on the basis of different nucleation, growth and hard impingement mechanisms, has been demonstrated. Without recourse to any specific kinetic model, simple recipes have been given for the determination of the growth exponent and the effective activation energy from the experimental transformation-rate data.
机译：固态相变的进展通常可以细分为三种重叠的机制：成核，生长和撞击。如果发生硬碰撞，则可以分别建模。在此基础上，对确定转换动力学参数的最新数值和分析方法进行了概述。该处理集中在等温和等时进行的转换上。为了扩展可以用分析方法描述的变换范围，讨论中包括了与实验结果兼容的或多或少的许多经验子模型。已经证明，一旦采用了与时间或温度有关的增长指数和有效活化能的概念，并且与现有的实验结果相一致，就可以使用强大，灵活的分析模型。已经证明了一个明确的（数字）程序，可以基于不同的成核，生长和硬碰撞机理，从实验转化率数据推导出操作动力学过程。在不依靠任何特定动力学模型的情况下，已经给出了简单的配方，用于根据实验转化率数据确定生长指数和有效活化能。

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