Application of phase-field simulation of solidification and texture evolution to diffusion chronometry

凝固相场模拟和织构演化在扩散计时中的应用

• 批准号: 439529260
• 负责人: Dr. Julia Kundin
• 金额: --
• 依托单位: Department of Materials
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/439529260?language=en
• 关键词: Application; phase; field; simulation; solidification

The aim of the project is to initiate a quantitative understanding of the growth mechanisms and texture formation during the growth and dissolution of crystals in melt bearing systems. This is of particular interest for the applications of Diffusion Chronometry to magmatic systems, where the process of textural maturation involving growth and dissolution of crystals and associated changes in crystal shapes lead to modification of diffusion profiles. The phase-field modeling method, which is an efficient, thermodynamically consistent tool for modeling complex diffusion and growth phenomena, will be used. An effective multicomponent multi-phase-field approach will be coupled to the methods for anisotropic diffusion and anisotropic faceted crystal growth. A model olivine-melt system has been chosen for this preliminary study. Textural evolutions based on estimated values of surface energy and thermodynamic parameters will be studied and compared to results from experiments. A particular goal of the research project is the investigation of the effect of texture and crystal shape evolution by crystal growth/dissolution on the lifetime of a particular crystal in a magmatic environment. The developed approach will help to define the upper limits of timescales accessible by diffusion chronometry. Anisotropic multicomponent phase-field modeling of growth/dissolution processes also provides a foundation for reliable predictions of microstructure and texture evolution in related material systems.

该项目的目的是定量了解熔体轴承系统中晶体生长和溶解过程中的生长机制和织构形成。这对于扩散计时法在岩浆系统中的应用特别有意义，其中涉及晶体生长和溶解的结构成熟过程以及晶体形状的相关变化导致扩散剖面的改变。将使用相场建模方法，这是一种有效的、热力学一致的工具，用于建模复杂的扩散和生长现象。有效的多分量多相场方法将与各向异性扩散和各向异性面晶体生长方法相结合。本初步研究选择了橄榄石熔体模型系统。将研究基于表面能和热力学参数估计值的织构演化，并与实验结果进行比较。该研究项目的一个特定目标是研究晶体生长/溶解引起的纹理和晶体形状演化对岩浆环境中特定晶体寿命的影响。所开发的方法将有助于定义扩散计时法可达到的时间尺度的上限。生长/溶解过程的各向异性多组分相场建模还为相关材料系统中微观结构和纹理演化的可靠预测提供了基础。