Scaling behavior of stiffness and strength of hierarchical network nanomaterials

被引:131
作者
Shi, Shan [1 ,2 ]
Li, Yong [1 ,2 ]
Ngo-Dinh, Bao-Nam [1 ,3 ]
Markmann, Juergen [1 ,2 ]
Weissmueller, Joerg [1 ,2 ]
机构
[1] Helmholtz Zentrum Geesthacht, Inst Mat Res, Mat Mech, D-21502 Geesthacht, Germany
[2] Hamburg Univ Technol, Inst Mat Phys & Technol, D-21073 Hamburg, Germany
[3] Tech Univ Carolo Wilhelmina Braunschweig, Inst Mat, D-38106 Braunschweig, Germany
关键词
NANOPOROUS-GOLD; MECHANICAL RESPONSE; YIELD STRENGTH; SIZE; METALS; BONE; DEFORMATION; FABRICATION; GENERATION; ULTRALIGHT;
D O I
10.1126/science.abd9391
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Structural hierarchy can enhance the mechanical behavior of materials and systems. This is exemplified by the fracture toughness of nacre or enamel in nature and by human-made architected microscale network structures. Nanoscale structuring promises further strengthening, yet macroscopic bodies built this way contain an immense number of struts, calling for scalable preparation schemes. In this work, we demonstrated macroscopic hierarchical network nanomaterials made by the self-organization processes of dealloying. Their hierarchical architecture affords enhanced strength and stiffness at a given solid fraction, and it enables reduced solid fractions by dealloying. Scaling laws for the mechanics and atomistic simulation support the observations. Because they expose the systematic benefits of hierarchical structuring in nanoscale network structures, our materials may serve as prototypes for future lightweight structural materials.
引用
收藏
页码:1026 / +
页数:33
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