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High-order hierarchical nanotwins with superior strength and ductility
Liu, XW; Sun, LG; Zhu, LL; Liu, JB; Lu, K; Lu, J; Lu, J (reprint author), City Univ Hong Kong, Natl Precious Met Mat Engn Res Ctr, Hong Kong Branch, Kowloon, Hong Kong, Peoples R China.
2018-05-01
发表期刊ACTA MATERIALIA
ISSN1359-6454
卷号149页码:397-406
摘要Microstructures dominate the mechanical properties of metals because of the interactions of dislocations and other defects. Hierarchical nanotwins (HNTs) in different orientations/orders are more effective in interacting with dislocations, which will enhance the mechanical properties of materials. However, the confirmation of high-order HNTs (>2) has not been formally established to fully explore the potential of mechanical property enhancement of HNT structured materials. In this work, HNTs up to five orders with sequential identification in pure silver (Ag) were fabricated by combining the techniques of surface mechanical attrition treatment and uniaxial pre-loading. The strength of this high-order HNT-structured Ag has been improved by over three times without sacrificing ductility. In addition, compared to other structures, the HNT structure can increase the limit of strength of the materials at high ductility. By performing in situ transmission electron microscopy, the HNT generation mechanism is revealed in real time, and the generation conditions of stable HNTs are established. Molecular dynamic simulations present the structure evolution details of HNTs at atomic scale, and the dislocation-based theory unveils the underlying mechanism. By using this generic approach, high-order HNT (>= 5) structures can be achieved in crystalline materials. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; Microstructures dominate the mechanical properties of metals because of the interactions of dislocations and other defects. Hierarchical nanotwins (HNTs) in different orientations/orders are more effective in interacting with dislocations, which will enhance the mechanical properties of materials. However, the confirmation of high-order HNTs (>2) has not been formally established to fully explore the potential of mechanical property enhancement of HNT structured materials. In this work, HNTs up to five orders with sequential identification in pure silver (Ag) were fabricated by combining the techniques of surface mechanical attrition treatment and uniaxial pre-loading. The strength of this high-order HNT-structured Ag has been improved by over three times without sacrificing ductility. In addition, compared to other structures, the HNT structure can increase the limit of strength of the materials at high ductility. By performing in situ transmission electron microscopy, the HNT generation mechanism is revealed in real time, and the generation conditions of stable HNTs are established. Molecular dynamic simulations present the structure evolution details of HNTs at atomic scale, and the dislocation-based theory unveils the underlying mechanism. By using this generic approach, high-order HNT (>= 5) structures can be achieved in crystalline materials. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属[liu, xiaowei ; sun, ligang ; lu, jian] city univ hong kong, natl precious met mat engn res ctr, hong kong branch, kowloon, hong kong, peoples r china ; [liu, xiaowei ; sun, ligang ; lu, jian] city univ hong kong, shenzhen res inst, shenzhen 518057, peoples r china ; [zhu, linli] zhejiang univ, dept engn mech, key lab soft machines & smart devices zhejiang pr, hangzhou 310027, zhejiang, peoples r china ; [liu, jiabin] zhejiang univ, sch mat sci & engn, hangzhou 310027, zhejiang, peoples r china ; [lu, k.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, liaoning, peoples r china
关键词Centered-cubic Metals Mechanical-properties Nanocrystalline Materials Molecular-dynamics Grain-size Deformation Silver Copper Temperature Plasticity
学科领域Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者National Key R&D Program of China [2017YFA0204403]; RGC Hong Kong General Research Fund [CityU 11247516]; National Natural Science Foundation of China [51590892, 11472243, 11621062]; Hong Kong Innovation and Technology Commission via the Hong Kong Branch of National Precious Metals Material Engineering Research Center [9448003]; Guangdong Science and Technology Department [2014B050504003]; Technology Innovation Commission of Shenzhen Municipality [SZSTI JCYJ20150601102053069, SZSTI ZDSYS201602291653165]; Shenzhen Virtual University Park [R-IND1710]; Shenzhen Science Technology and Innovation Commission [JSGG 20141020103826038]; Fundamental Research Funds for the Central Universities
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/79328
专题中国科学院金属研究所
通讯作者Lu, J (reprint author), City Univ Hong Kong, Natl Precious Met Mat Engn Res Ctr, Hong Kong Branch, Kowloon, Hong Kong, Peoples R China.
推荐引用方式
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Liu, XW,Sun, LG,Zhu, LL,et al. High-order hierarchical nanotwins with superior strength and ductility[J]. ACTA MATERIALIA,2018,149:397-406.
APA Liu, XW.,Sun, LG.,Zhu, LL.,Liu, JB.,Lu, K.,...&Lu, J .(2018).High-order hierarchical nanotwins with superior strength and ductility.ACTA MATERIALIA,149,397-406.
MLA Liu, XW,et al."High-order hierarchical nanotwins with superior strength and ductility".ACTA MATERIALIA 149(2018):397-406.
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