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

Tomotsugu Shimokawa; Tomoaki Yamashita; Tomoaki Niiyama; Nobuhiro Tsuji

doi:10.2320/matertrans.MH201518

Tomotsugu Shimokawa, Tomoaki Yamashita, Tomoaki Niiyama, Nobuhiro Tsuji

著者情報

キーワード: grain refinement, grain subdivision, severe plastic deformation, geometrically necessary boundary, disclination, molecular dynamics

ジャーナルフリー

2016 年 57 巻 9 号 p. 1392-1398

DOI https://doi.org/10.2320/matertrans.MH201518

詳細

抄録

Severe plastic deformation (SPD) processes can produce the bulk ultrafine-grained metals with grain sizes of less than 1 μm. 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.

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