On the damage tolerance of 3-D printed Mg-Ti interpenetrating-phase composites with bioinspired architectures

Mingyang Zhang, Ning Zhao, Qin Yu, Zengqian Liu (), Ruitao Qu, Jian Zhang, Shujun Li, Dechun Ren, Filippo Berto, Zhefeng Zhang () and Robert O. Ritchie ()
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Mingyang Zhang: Chinese Academy of Sciences
Ning Zhao: Lanzhou University of Technology
Qin Yu: University of California Berkeley
Zengqian Liu: Chinese Academy of Sciences
Ruitao Qu: Chinese Academy of Sciences
Jian Zhang: Chinese Academy of Sciences
Shujun Li: Chinese Academy of Sciences
Dechun Ren: Chinese Academy of Sciences
Filippo Berto: Norwegian University of Science and Technology, Richard Birkelands vei 2B
Zhefeng Zhang: Chinese Academy of Sciences
Robert O. Ritchie: University of California Berkeley

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Bioinspired architectures are effective in enhancing the mechanical properties of materials, yet are difficult to construct in metallic systems. The structure-property relationships of bioinspired metallic composites also remain unclear. Here, Mg-Ti composites were fabricated by pressureless infiltrating pure Mg melt into three-dimensional (3-D) printed Ti-6Al-4V scaffolds. The result was composite materials where the constituents are continuous, mutually interpenetrated in 3-D space and exhibit specific spatial arrangements with bioinspired brick-and-mortar, Bouligand, and crossed-lamellar architectures. These architectures promote effective stress transfer, delocalize damage and arrest cracking, thereby bestowing improved strength and ductility than composites with discrete reinforcements. Additionally, they activate a series of extrinsic toughening mechanisms, including crack deflection/twist and uncracked-ligament bridging, which enable crack-tip shielding from the applied stress and lead to “Γ”-shaped rising fracture resistance R-curves. Quantitative relationships were established for the stiffness and strengths of the composites by adapting classical laminate theory to incorporate their architectural characteristics.

Date: 2022
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DOI: 10.1038/s41467-022-30873-9

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