| Abstract Scope |
Additive Manufacturing (AM) allows rapid fabrication of geometrically complex parts without expensive tooling. Nanoscale AM techniques, such as two-photon polymerization Direct Laser Writing, have demonstrated enormous success in fabricating a wide range of nano-architected materials, where the local scale of the architecture is so small that size effects on materials properties yield materials with unprecedented performance. The ability to control properties with micro/nano-scale resolution is not limited to nanoscale AM processes, as even large-scale techniques such as Laser Powder Bed Fusion (LPBF) and Cold Spray (CS) fabricate parts via addition of microscale building blocks. The ability to control the evolution of these blocks during printing opens opportunities for fabrication of both architected and bulk large-scale AM materials with accurately tailored micro/nano-structural features. We present metal/metal composites and shell-based architected materials produced by LPBF of steel with locally tailorable microstructure, and unique opportunities in microstructural control offered by CS AM. |