FCC金属中位错与孪晶界交互作用的原子机制  

Atomic mechanisms of dislocation and TB interaction in FCC metallic materials

作　　者：张家宝 李志鹏 杨鲁岩 李炜 王立华[1] 韩晓东[1] ZHANG Jia-bao;LI Zhi-peng;YANG Lu-yan;LI Wei;HAN Xiao-dong(Institute of Microstructure and Property of Advanced Materials,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学固体微结构与性能研究所,北京100124

出　　处：《电子显微学报》2020年第6期731-743,共13页Journal of Chinese Electron Microscopy Society

基　　金：北京市自然科学基金资助项目(No.Z180014);北京卓越青年科学家计划(No.BJJWZYJH01201910005018);“111”计划(No.DB18015).

摘　　要：如何同时提高FCC结构金属材料的强度、延展性等力学性能,一直是材料科学领域的重点和热点问题。研究者们发现在FCC结构金属材料中引入孪晶结构可使其在塑性变形过程中表现出优异的强度、延展性等力学性能。随后,大量的实验及计算模拟研究了孪晶能够提高材料强度并确保其具有高延展性的原子机制,取得了许多重要的成果。本文介绍了FCC结构金属材料中孪晶的结构及形核方式;综述了目前人们在位错与孪晶界交互作用原子机理研究中的主要进展;总结了孪晶界对位错的阻碍、吸收、相互反应等作用机制。为进一步深入研究位错与孪晶界交互作用的机制提供参考,为设计兼具高强度高延展性的FCC金属材料提供思路。Preparation of FCC metals with an exceptional combination of high strength and good ductility has attracted great interest in the field of materials science. Many studies have shown that the introduction of twins to FCC metals leads to a significant increase in both strength and ductility. Afterwards a lot of experiments and computational simulations have been carried out to study the atomic mechanism by which twins can enhance the material strength and ensure high ductility, and many important results have been achieved. This review introduced the structures and nucleation of twins in FCC metals, and described the main progress in the study of the atomic mechanism of dislocation and twin boundary interaction. This paperalso summarized the mechanism of the twin boundary barriers, absorption and interaction, and provided references for future study of reaction mechanisms and ideas for designing the FCC metals with ultrahigh strength and ductility.

关 键 词：面心立方结构 位错 共格孪晶界 非共格孪晶界 原子机制 

分 类 号：TG111.2[金属学及工艺—物理冶金] TG115.215.3[金属学及工艺—金属学]