1. On the damage tolerance of 3-D printed Mg-Ti interpenetrating-phase composites with bioinspired architectures
- Author
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Zhang, Mingyang, Zhao, Ning, Yu, Qin, Liu, Zengqian, Qu, Ruitao, Zhang, Jian, Li, Shujun, Ren, Dechun, Berto, Filippo, Zhang, Zhefeng, and Ritchie, Robert O
- Subjects
Printing ,Three-Dimensional ,Titanium - 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.
- Published
- 2022