Shear bands in metallic materials have been reported to be catastrophic because they normally lead to non-uniform plastic deformation.Ductility of laminated metallic composites deteriorates with increasing processing strain,particularly for those having hexagonal-close-packed(hcp)constituents due to inade-quate slip systems and consequently prominent shear banding.Here,we propose a design strategy that counterintuitively tolerates the bands with localized strains,i.e.the shear banded laminar(SBL)struc-ture,which promotesdislocation activation in hcp metals and renders unprecedented strength-ductility combination in hcp-metal-based composites fabricated by accumulative roll bonding(ARB).The SBL structure is characterized with one soft hcp metal constrained by adjacent hard metal in which dis-locations have been accumulated near the bimetal interfaces.High-energy X-ray diffraction astonishingly reveals that more than 90％of dislocations are non-basal in Ti layers of the SBL Ti/Nb composite processed by eight ARB cycles.Moreover,dislocations occupy a high fraction of～30％,promoting furthercross slip.The unique stress field tailored by both shear banding and heterophase interface-mediated de-formation accommodation triggers importantslip.This SBL design is of significance for developing hcp-based laminates and other heterostructured materials with high performances.

Shuang Jiang;Ru Lin Peng;Kristián Máthis;Hai-Le Yan;Gergely Farkas;Zoltán Hegedues;Ulrich Lienert;Johan Moverare;Xiang Zhao;Liang Zuo;Nan Jia;Yan-Dong Wang

Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),School of Material Science and Engineering,Northeastern University,Shenyang 110819,China;Division of Engineering Materials,Department of Management and Engineering,Link?ping University,Link?ping 58183,Sweden;Department of Physics of Materials,Faculty of Mathematics and Physics,Charles University,Ke Karlovu 5,Prague 12116,Czech Republic;Nuclear Physics Institute of the Czech Academy of Sciences,?e? 130,Husinec-?e? 25068,Czech Republic;Deutsches Elektronen-Synchrotron(DESY),Notkestr.85,Hamburg 22607,Germany;Beijing Advanced Innovation Center for Materials Genome Engineering,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China

材料科学技术（英文版）

[1]Shuang Jiang;Ru Lin Peng;Kristián Máthis;Hai-Le Yan;Gergely Farkas;Zoltán Hegedues;Ulrich Lienert;Johan Moverare;Xiang Zhao;Liang Zuo;Nan Jia;Yan-Dong Wang-.Shear banding-inducedslip enables unprecedented strength-ductility combination of laminated metallic composites)[J].材料科学技术（英文版）,2022(15):260-268

inducedslip,astonishingly,heterophase

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