Grain Subdivision Mechanism Related to Partial Disclinations in Severe Plastic Deformation: A Molecular Dynamics Study

被引：5
|
作者：
Shimokawa, Tomotsugu [1 ]
Yamashita, Tomoaki [2 ]
Niiyama, Tomoaki [3 ]
Tsuji, Nobuhiro [4 ,5 ]
机构：
[1] Kanazawa Univ, Fac Mech Engn, Kanazawa, Ishikawa 9201192, Japan
[2] Kanazawa Univ, Div Mech Sci & Engn, Kanazawa, Ishikawa 9201192, Japan
[3] Kanazawa Univ, Coll Sci & Engn, Kanazawa, Ishikawa 9021192, Japan
[4] Kyoto Univ, Dept Mat Sci & Engn, Kyoto 6068501, Japan
[5] Kyoto Univ, ESISM, Kyoto 6068501, Japan
来源：
MATERIALS TRANSACTIONS | 2016年 / 57卷 / 09期
关键词：
grain refinement; grain subdivision; severe plastic deformation; geometrically necessary boundary; disclination; molecular dynamics; CHANNEL; REFINEMENT; EVOLUTION; MOTION;
D O I：
10.2320/matertrans.MH201518
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Severe plastic deformation (SPD) processes can produce the bulk ultrafine-grained metals with grain sizes of less than 1 mu m. However, the mechanism of grain refinement during SPD is not completely understood. In this study, we perform molecular dynamics simulations of a SPD process like equal-channel angular pressing and demonstrate grain refinement phenomena during the SPD simulations. We propose a new mechanism of grain subdivision related to the mobility of partial disclinations formed in strain-gradient regions during SPD.
引用
收藏
页码：1392 / 1398
页数：7
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