Strategy for managing both high strength and large ductility in structural materials-sequential nucleation of different deformation modes based on a concept of plaston

SCRIPTA MATERIALIA

卷:181

Article

Tsuji, Nobuhiro^1,2  Ogata, Shigenobu^1,3  Inui, Haruyuki^1,2  Tanaka, Isao^1,2  Kishida, Kyosuke^1,2  Gao, Si²  Mao, Wenqi²  Bai, Yu²  Zheng, Ruixiao^2,4  Du, Jun-Ping^1,3 

[1] Kyoto Univ, ESISM, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

[2] Kyoto Univ, Dept Mat Sci & Engn, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan

[3] Osaka Univ, Grad Sch Engn Sci, Dept Mech Engn & Bioengn, Toyonaka, Osaka 5608531, Japan

[4] Beihang Univ, Sch Mat Sci & Engn, Key Lab Aerosp Adv Mat & Performance, Minist Educ, Beijing 100191, Peoples R China

关键词: Plastic instability;    Strain hardening;    Metallic materials;    Deformation mode;    Mechanical activation;   

DOI  :  10.1016/j.scriptamat.2020.02.001

来源: Elsevier

【 摘 要 】

Based on recent findings in ultrafine grained metals, we proposed a strategy for overcoming the strength-ductility trade-off in structural metallic materials. Sequential nucleation of different deformation modes, such as unusual slip systems, deformation twinning, martensitic transformation, etc., would regenerate strain-hardening ability of the material, leading to high strength and large tensile ductility. For discussing the activation of different deformation modes in atomistic scales, the concept of plaston which considered local excitation of atoms under singular dynamic fields was proposed. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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