| Evolution of dislocation cells during plastic deformation |
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| 作者姓名： | 周志敏 孙艳蕊 周海涛 |
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| 作者单位： | [1]CollegeofScience,NortheasternUniversity,Shenyang110004,China [2]StateKeyLaboratoryofMetalMatrixComposite,ShanghaiJiaotongUniversity,Shanghai200030,China |
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| 基金项目： | the Foundation of Education Ministry for Returned Scholars，西北大学校科研和教改项目，中国博士后科学基金 |
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| 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 200 - 250 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 he 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.
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| 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 during plastic deformation |
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| ZHOU Zhi-min,SUN Yan-rui,ZHOU Hai-tao.Evolution of dislocation cells during plastic deformation[J].Transactions of Nonferrous Metals Society of China,2005,15(1):149-152. |
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| Authors: | ZHOU Zhi-min SUN Yan-rui ZHOU Hai-tao |
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| Abstract: | 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 200-250 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. |
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| Keywords: | evolution of dislocation cells ultrafine grain severe plastic deformation |
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