块体金属纳米晶材料力学行为研究进展  

Progress in Mechanical Behavior of Bulk Nanocrystalline Metallic Materials

作　　者：龚玉兰[1] 任世影[2] 吴小香[2] 程莲萍[2] 龙燕[2] 朱心昆[2] 

机构地区：[1]昆明理工大学理学院,云南昆明650093 [2]昆明理工大学材料科学与工程学院,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2013年第1期16-27,共12页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(50874056)

摘　　要：本文总结了近年来块体金属纳米晶材料的研究成果.简要讨论了各种制备技术及其特点,分析了块体金属纳米晶材料的强度/硬度、塑性、加工硬化率以及应变速率敏感性等力学性能,深入探讨了在纳米材料中可能存在的各种变形机制,包括位错的发射和湮灭,晶界滑移,晶粒旋转和合并以及孪晶诱导的变形等.最后,介绍了几种同时提高块体金属纳米晶材料强度和塑性的方法.The recent progress in the field of bulk nanocrystalline metallic materials is reviewed in this paper. Some major synthesis methods are introduced briefly. The mechanical properties of bulk nanoerystalline metallic materials are discussed, such as strength/hardness, ductility, work hardening rate and strain-rate sensitivity. The underlying deformation mechanisms of nancrystalline materials are described in details, including the emis- sion and annihilation of dislocations, gain-boundary sliding, grain rotation and coalescence, and twin mediated deformation. Finally, this article summarizes several strategies used to achieve both high strength and considera- ble ductility simultaneously in tension.

关 键 词：块体金属纳米晶材料 制备 力学性能 变形机理 

分 类 号：TG301[金属学及工艺—金属压力加工]