(1. 江苏海洋大学 机械工程学院，连云港 222005；
2. 江苏海洋大学 工程训练中心，连云港 222005)
摘 要: 沿晶失效行为是金属多晶材料中常见的一种现象，在不改变材料化学成分的基础上，利用基于退火孪晶的晶界工程技术对材料的晶界结构进行调控是实现材料晶界相关性能改善的有效途径。本文首先对典型退火孪晶的形貌和形成理论进行了阐述，然后对比分析了晶界特征分布优化的五种微观机制；其次，系统地归纳了晶界工程的主要实现途径及关键影响因素，并评述了不同随机晶界网络连通性表征方法的特点；最后总结了晶界工程技术在改善面心立方金属材料晶界相关性能方面的应用，同时指出了晶界工程研究领域面临的挑战，并展望了未来的研究方向。
关键字: 面心立方金属；晶界工程；晶界特征分布；随机晶界网络连通性
（1. School of Mechanical Engineering, Jiangsu Ocean University, Lianyungang 222005, China;
2. Engineering Training Center, Jiangsu Ocean University, Lianyungang 222005, China）
Abstract:The intergranular failure behavior is a common phenomenon in metallic polycrystalline materials. It is an effective way to improve the grain boundary-related properties of materials by using grain boundary engineering technology based on annealing twins without changing the chemical composition of materials. In this paper, the morphology and formation theory of typical annealed twins were firstly described, and then five microscopic mechanisms for optimizing the grain boundary character distribution were compared and analyzed. Secondly, the main implementation approaches and key influencing factors of grain boundary engineering were systematically summarized, and the characteristics of different methods for characterizing the connectivity of random boundary networks were also reviewed. Finally, the applications of grain boundary engineering technology in improving the grain boundary-related properties of face-centered cubic metal materials were summarized, while the challenges in the field of grain boundary engineering research were pointed out and future research directions were also expected.
Key words: face-centered cubic metals; grain boundary engineering; grain boundary character distribution; connectivity of random network
