[論文レビュー] Landscape of grain boundary migration in polycrystals

Jianfeng Hu|arXiv (Cornell University)|Jan 3, 2026

Microstructure and mechanical properties被引用数 0

ひとこと要約

The paper analyzes grain boundary migration dynamics in polycrystals, resolving conflicts between experiments and classical models and proposing a generalized migration framework. It shows weak correlation between migration velocity and curvature and highlights the role of GB step energy.

ABSTRACT

Grain boundary (GB) migration is a pivotal process that significantly impacts the development of microstructures, thereby influencing the practical performance of polycrystalline materials. Recent advances in 3D experimental techniques have revealed conflicts between observed GB migration behaviors and classical theoretical models. These contradictions raise two fundamental questions, namely, whether GB migration is linearly related to curvature, and how GB energy affect GB migration? Here, we provide a comprehensive analysis of GB migration dynamics in polycrystals and resolve these conflicts within a theoretical framework. Unexpectedly, in a polycrystalline system, the range of GB migration velocities shows little correlation with the magnitude of its curvature. The extent of the influence of GB energy on GB migration is revealed to mostly depend on GB step energy. Finally, a more general GB migration formula is derived to incorporate various driving forces beyond curvature.

研究の動機と目的

• Motivate why GB migration governs polycrystal microstructure evolution and material performance.
• Address conflicts between 3D experimental observations and classical GB migration theories.
• Determine how GB energy and curvature influence migration in polycrystals.
• Develop a generalized GB migration formula incorporating various driving forces.

提案手法

• Analyze GB migration dynamics within a polycrystalline system.
• Identify relationships between migration velocity, curvature, and GB energy from the framework.
• Isolate the influence of GB step energy on migration behavior.
• Derive a more general GB migration formula that includes driving forces beyond curvature.

実験結果

リサーチクエスチョン

• RQ1 What is the relationship between GB migration velocity and curvature in polycrystals?
• RQ2 How does GB energy influence GB migration, and what is the role of GB step energy?
• RQ3 Can a generalized GB migration formula incorporate driving forces beyond curvature?

主な発見

• Migration velocities show little correlation with the magnitude of curvature in polycrystals.
• The influence of GB energy on migration largely depends on GB step energy.
• A general GB migration formula is derived to include various driving forces beyond curvature.