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首页> 外文期刊>Philosophical Magazine Letters >Precipitation of niobium carbonitrides in ferrite: chemical composition measurements and thermodynamic modelling
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Precipitation of niobium carbonitrides in ferrite: chemical composition measurements and thermodynamic modelling

机译：铁氧体中碳氮化铌的沉淀：化学成分测量和热力学模型

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摘要

High-resolution transmission electron microscopy and electron-energy loss spectroscopy have been used to characterize the structure and chemical composition of niobium carbonitrides in the ferrite of a Fe-Nb-C-N model alloy at different precipitation stages. Experiments seem to indicate the coexistence of two types of precipitates: pure niobium nitrides and mixed sub-stoichiometric niobium carbonitrides. In order to understand the chemical composition of these precipitates, a thermodynamic formalism has been developed to evaluate the nucleation and growth rates (classical nucleation theory) and the chemical composition of nuclei and existing precipitates. A model based on the numerical solution of thermodynamic and kinetic equations is used to compute the evolution of the precipitate size distribution at a given temperature. The predicted compositions are in very good agreement with experimental results.
机译：高分辨率透射电子显微镜和电子能量损失谱已用于表征不同析出阶段的Fe-Nb-C-N模型合金的铁素体中碳氮化铌的结构和化学组成。实验似乎表明两种类型的沉淀物共存：纯氮化铌和混合亚化学计量的碳氮化铌。为了了解这些沉淀物的化学组成，已经开发出一种热力学形式主义来评估成核和生长速率（经典成核理论）以及核和现有沉淀物的化学组成。基于热力学和动力学方程数值解的模型用于计算给定温度下沉淀物尺寸分布的演变。预测的组成与实验结果非常吻合。

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