摘要
与传统块体金属材料相比,纳米金属材料具有更加优异的力学性能.而材料外在的力学性能与材料在外力作用下的原子尺度显微结构变化直接相关.研究金属材料在应力下结构演化的原子机制,建立一个清晰的原子尺度下微观结构演变的物理图像,是高性能材料设计和优化的重要基础.主要介绍近年来面心立方纳米金属变形机理研究上取得的主要进展.首先,对各种研究金属纳米材料变形机制的实验方法进行一个简单的介绍;然后,对多晶和单晶金属纳米材料的尺寸效应以及变形机制的研究进行总结;最后,归纳纳米金属材料与块体金属材料塑性变形模式的不同,并对未来面临的挑战做简要的展望.
Nano-structure metals always exhibite better mechanical properties compared to their bulk counterparts. The physical and chemical properties of materials are directly determined by their atomicscale microstructure evolution mechanism. Instigating the atomic-scale deformation mechanism of metallic materials and providing a clear physical picture of their microstructure evolution mechanism at subangstrom scale are crucial for the design and optimization of metallic materials with high-performance.The recent progress in scientific research on the deformation mechanism of face-centered cubic( FCC)nano-structure metals was introduced. First,the experimental methods for studying the deformation mechanism of nano-structure metals were introduced. Then,the size effect and deformation mechanism of nanocrystalline and nanocrystal metals were summarized. Finally,the difference of the deformation modes between nano-structure metals and bulk metal materials were summarized briefly,and the challenges and research directions in the future were prospected.
作者
王立华
韦如建
方云义
罗俊锋
陈艳辉
李炜
韩晓东
WANG Lihua;WEI Rujian;FANG Yunyi;LUO Junfeng;CHEN Yanhui;LI Wei;HAN Xiaodong(Beijing Key Laboratory of Advanced Materials Microstructure and Properties,Institute of Microstructure and Properties of Advanced Materials,Beijing University of Technology,Beijing 100124,China;Department of Physics,Beijing Normal University,Beijing 100875,China;Grikin Advanced Materials CO.,LTD.,Beijing 102200,China)
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2019年第11期1125-1146,共22页
Journal of Beijing University of Technology
基金
国家重点研发计划资助项目(2017YFB0305501)
北京高校卓越青年科学家项目(BJJWZYJH01201910005018)
北京市自然科学基金重点资助项目(Z180014)
