(1. 江蘇海洋大學 機械工程學院，連云港 222005；
2. 江蘇海洋大學 工程訓練中心，連云港 222005)
摘 要: 沿晶失效行為是金屬多晶材料中常見的一種現(xiàn)象，在不改變材料化學成分的基礎上，利用基于退火孿晶的晶界工程技術對材料的晶界結(jié)構進行調(diào)控是實現(xiàn)材料晶界相關性能改善的有效途徑。本文首先對典型退火孿晶的形貌和形成理論進行了闡述，然后對比分析了晶界特征分布優(yōu)化的五種微觀機制；其次，系統(tǒng)地歸納了晶界工程的主要實現(xiàn)途徑及關鍵影響因素，并評述了不同隨機晶界網(wǎng)絡連通性表征方法的特點；最后總結(jié)了晶界工程技術在改善面心立方金屬材料晶界相關性能方面的應用，同時指出了晶界工程研究領域面臨的挑戰(zhàn)，并展望了未來的研究方向。
關鍵字: 面心立方金屬；晶界工程；晶界特征分布；隨機晶界網(wǎng)絡連通性
（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
