摘要
In recent years, materials with ultrafine grain size(UFG) have attracted much attention. By using severe plastic deformation(SPD) techniques, materials with fine grain size as small as 200250 nm have been obtained. However, the nature of the grain boundaries has not been theoretically understood. It is still an unsolved question whether or not finer grain sizes down to 100 nm could be reached. A semi-quantitative model for the evolution of dislocation cells in plastic deformation was proposed. The linear stability analysis of this model leads to some interesting results, which facilitate the understanding of the formation of cell structures and of the factors determining the lower limit of the cell size of SPD materials.
In recent years, materials with ultrafine grain size(UFG) have attracted much attention. By using severe plastic deformation(SPD) techniques, materials with fine grain size as small as 200250 nm have been obtained. However, the nature of the grain boundaries has not been theoretically understood. It is still an unsolved question whether or not finer grain sizes down to 100 nm could be reached. A semi-quantitative model for the evolution of dislocation cells in plastic deformation was proposed. The linear stability analysis of this model leads to some interesting results, which facilitate the understanding of the formation of cell structures and of the factors determining the lower limit of the cell size of SPD materials.
出处
《中国有色金属学会会刊：英文版》
CSCD
2005年第1期149-152,共4页
Transactions of Nonferrous Metals Society of China
基金
Project supported by the Foundation of Education Ministry for Returned Scholars
Project supported by the Foundationof Northeastern University for Returned Doctors
Project(2003033372) supported by the National Postdoctoral Foundation of China
关键词
位错细胞
超细颗粒
严格塑性形变
金属材料
evolution of dislocation cells
ultrafine grain
severe plastic deformation
