Elastic effects on heterogeneous nucleation and microstructure formation

弹性对异质成核和微观结构形成的影响

• 批准号: 51462812
• 负责人: Professor Dr. Heiner Müller-Krumbhaar
• 金额: --
• 依托单位: PGI-1 / IAS-1: Quanten-Theorie der Materialien
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/51462812?language=en
• 关键词: Elastic; effects; heterogeneous; nucleation; microstructure

Heterogeneous nucleation and the growth of microstructures are often accompanied by elastic deformations which can significantly influence the thermodynamical properties and kinetics of these processes. Lattice mismatches, density differences or concentration gradients are primary origins for these effects, which lead to the appearance of new lengthscales and noticeable consequences for the material properties. Despite the obvious relevance of these phenomena, generally accepted theories which take into account the elastic long-range interactions in a consistent way are not yet available, especially under consideration of the atomic structures and ordering. In this project, we will investigate the influence of these new effects on the dynamical processes of heterogeneous nucleation and microstructure development. The general aim is to obtain generalizations of classical scaling relations by analytical and numerical methods, and to compare them to experimental results.

非均相成核和微观结构的生长通常伴随着弹性变形，这对这些过程的热力学性质和动力学有很大的影响。晶格错配、密度差异或浓度梯度是这些效应的主要来源，它们导致新的长度尺度的出现和对材料性能的显著影响。尽管这些现象之间存在明显的相关性，但目前还没有公认的理论能够以一致的方式考虑弹性远程相互作用，特别是在考虑原子结构和有序的情况下。在本项目中，我们将研究这些新效应对非均相成核和微观结构发展的动力学过程的影响。总的目标是通过解析和数值方法得到经典标度关系的推广，并将其与实验结果进行比较。