Enhanced mechanical properties of CNTs/Mg biomimetic laminated composites

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:802

Article

Song, Zhengxiang¹  Hu, Xiaoshi²  Xiang, Yeyang²  Wu, Kun²  Wang, Xiaojun¹ 

[1] Harbin Inst Technol, Natl Key Lab Precis Hot Proc Met, Harbin, Peoples R China

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin, Peoples R China

关键词: Carbon nanotubes;    Metal-matrix composites (MMCs);    Layered structures;    Mechanical properties;   

DOI  :  10.1016/j.msea.2020.140632

来源: Elsevier

【 摘 要 】

The conflict between strength and toughness of Mg matrix composites extremely limits its engineering application. Inspired by nacre, CNTs/Mg bionic laminated composites were prepared by electrophoretic deposition. Compared with Mg, the yield strength and elongation of the laminated composite was increased by 52% and 59% respectively. CNTs/Mg laminated structure intercepts dislocations between layers. Compared with homogeneous composites, the stacked dislocations produce higher back stress strengthening. In the meantime, the isolation effect of CNTs layer makes the plastic deformation more uniform which delays the happening of necking. During the failure stage, the laminated structure has higher tolerance to cracks and delays the propagation of cracks. Overall, the toughness is improved by improving the plastic deformability and delaying crack propagation.

【 授权许可】

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