中文版 | English
Title

Shear instability in heterogeneous nanolayered Cu/Zr composites

Author
Corresponding AuthorLi,Jianjun
Publication Years
2022-04-10
DOI
Source Title
ISSN
1005-0302
Volume105Pages:81-91
Abstract
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 findings 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 Cu-Zr bilayers, the heterogeneous composite with one bilayer displayed a higher strength (2.15 GPa) and a favorable resistance to strain localization.
Keywords
URL[Source Record]
Language
English
SUSTech Authorship
Others
Scopus EID
2-s2.0-85115303388
Data Source
Scopus
Citation statistics
Document TypeJournal Article
Identifierhttps://kc.sustech.edu.cn/handle/2SGJ60CL/253402
DepartmentDepartment of Mechanical and Energy Engineering
Affiliation
1.School of Mechanical and Electrical Engineering,Central South University,Changsha,410083,China
2.State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha,410083,China
3.School of Materials Science and Engineering,Central South University,Changsha,410083,China
4.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.Beijing Institute of Technology Chongqing Innovation Center,Chongqing,401120,China
Recommended Citation
GB/T 7714
Li,Jianjun,Qin,Feng,Yan,Dingshun,et al. Shear instability in heterogeneous nanolayered Cu/Zr composites[J]. Journal of Materials Science and Technology,2022,105:81-91.
APA
Li,Jianjun,Qin,Feng,Yan,Dingshun,Lu,Wenjun,&Yao,Jiahao.(2022).Shear instability in heterogeneous nanolayered Cu/Zr composites.Journal of Materials Science and Technology,105,81-91.
MLA
Li,Jianjun,et al."Shear instability in heterogeneous nanolayered Cu/Zr composites".Journal of Materials Science and Technology 105(2022):81-91.
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