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Shear instability in heterogeneous nanolayered Cu/Zr composites

Journal of Materials Science & Technology 2022年第10期105卷 81-91页

作者： Jianjun Li Feng Qin dingshun yan Wenjun Lu Jiahao Yao School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Ultrastrong nanolayered metallic composites are usually subjected to low ductility due to plastic instability during deformation.Here we investigated the shear instability of a newly designed heterogeneous nanolayered Cu/Zr composites by microindentation.The heterogeneity in size was generated by inserting a few thin Cu-Zr bilayers with an individual layer thickness of 2.5-10 nm into the interface region of the Cu/Zr layered composites with an individual layer thickness of 100 nm.The microindentation tests showed that multiple shear bands appeared in the heterogeneous composite with one bilayer,whereas only a single shear band was formed in that with two or three bilayers.Most importantly,the layer strain in the multi-shear band region is much smaller than that in the single-shear band area.For example,the strain of the 100 nm layers within the shear band in the composite with one 10 nm bilayer could reach as low as 2.8,which was less than half of that in the composite with three 10 nm bilayers,i.e.,6.1.These fndings demonstrated that strain delocalization can be achieved through shear band multiplication if an appropriate number of thin bilayers were used as interlayers in the 100 nm Cu/Zr composites.Besides,compared with the homogeneous composite with an individual layer thickness of 100 nm and the bimodal composite which is composed of alternating one 100 nm Cu-Zr bilayer and two 10 nm CuZr bilayers,the heterogeneous composite with one bilayer displayed a higher strength(2.15 GPa)and a favorable resistance to strain localization.

关键词： Nanolayered metallic composites Sputtering Microindentation Shear band Strain delocalization

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电动汽车:一个用电增长点的考察

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电力需求侧管理 2002年第Z1期4卷 55-57页

作者：张媛杨定顺陈虹刘洁闫晓生 Tianjin Economic & Trade Commission Tianjin Electric Power Company Tianjin Environmental Protection Bureau Tianjin Energy Conservation Corporation

　　"Spread of marketing needs to be considered from thefact of Tianjin City. At least electric automobile is a goodsuggestion on it." said Kou Shiqing, general manager ofTianjin Electric Power Company. In order to widen themarket of electric power and improve the atmosphere qual-ity of city, Tianjin Electric Power Company invited leaderfrom city economy.……

关键词：电动汽车用电增长点考察 Electric Power Tianjin City

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