Continuous grain refinement using severe torsion straining process

Katsuaki Nakamura, Koji Neishi, Kenji Kaneko, Michihiko Nakagaki, Zenji Horita

    研究成果: 書籍/レポート タイプへの寄稿会議への寄与

    10 被引用数 (Scopus)

    抄録

    This study presents a new rapid continuous process for grain refinement in metallic materials through severe plastic deformation (SPD). The new process, designated in this study the severe torsion straining process (STSP), is applicable to a wide range of alloys based on aluminum, magnesium and copper including carbon steel. This process consists of producing a local heated zone in a rod and cooling both sides of the heated zone by spray water while rotating one end with the other. Thus, torsion strain is introduced in the local heated zone. The STSP can be continuous because the straining is achieved while the rod is shifted along the longitudinal axis of die rod. Furthermore, the process requires no die, suggesting a potential for commercialization of grain refinement through SPD. In this study, STSP was applied to an Al-Mg alloy and a Mg-Al-Zn alloy. It is shown that STSP is effective for both alloys so that the grain size is reduced to ∼1.5 μm for the Al alloy and ∼0.9 μm for the Mg alloy. Tensile testing showed that the strength is increased with a minimal decrease in uniform elongation. There is a critical ratio between rotation speed and moving speed, which defines the feasibility of STSP operation without breaking the rod. The grain size tends to be lowered as the ratio is close to the critical value.

    本文言語英語
    ホスト出版物のタイトルNanomaterials by Severe Plastic Deformation, NanoSPD3 - Proceedings of the 3rd International Conference on Nanomaterials by Severe Plastics Deformation
    出版社Trans Tech Publications Ltd
    ページ385-390
    ページ数6
    ISBN(印刷版)0878499857, 9780878499854
    DOI
    出版ステータス出版済み - 2006
    イベント3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3 - Fukuoka, 日本
    継続期間: 9月 22 20059月 26 2005

    出版物シリーズ

    名前Materials Science Forum
    503-504
    ISSN(印刷版)0255-5476
    ISSN(電子版)1662-9752

    その他

    その他3rd International Conference on Nanomaterials by Severe Plastics Deformation, NanoSPD3
    国/地域日本
    CityFukuoka
    Period9/22/059/26/05

    !!!All Science Journal Classification (ASJC) codes

    • 材料科学一般
    • 凝縮系物理学
    • 材料力学
    • 機械工学

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