Journal of Bionic Engineering (2022) 19:1578–1588 https://doi.org/10.1007/s42235-022-00257-2
Chao Xu1,2,3 · Xiang Chen3 · Wenzheng Wu3 · Qingping Liu1,2 · Luquan Ren1,2
1 Key Laboratory of Bionic Engineering (Ministry of Education), Jilin University, Changchun 130000, China
2 Weihai Institute of Bionics, Jilin University, Weihai 264400, China
3 School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130000, China
Abstract: Bioinspired Multi-Metal Structures (MMSs) combine distinct properties of multiple materials, benefting from improved properties and providing superior designs. Additive Manufacturing (AM) exhibits enormous advantages in applying diferent materials and geometries according to the desired functions at specifc locations of the structure, having great potential in fabricating multi-materials structures. However, current AM techniques have difculty manufacturing 3D MMSs without material cross-contamination fexibly and reliably. This study demonstrates a reliable, fast, and fexible direct ink writing method to fabricate 3D MMSs. The in-situ material-switching system enables the deposition of multiple metallic materials across diferent layers and within the same layer. 3D Fe–Cu MMSs with complex geometries and fne details are fabricated as proof of concept. The microstructures, chemical and phase compositions, and tensile fracture surfaces of the Fe–Cu interfaces indicate a well-bonded interface without cracks, delamination, or material cross-contamination. We envision this novel method making other metallic combinations and even metal-ceramic components. It paves the way for manufacturing 3D MMSs using AM and establishes the possibilities of numerous MMSs applications in engineering felds.
Keywords: Bioinspired · Bionic · Multi-metal structure (MMS) · Direct ink writing (DIW) · Additive manufacturing (AM)
a SEM images and b PSD of the Fe powder, c SEM images and d PSD of the Cu powder