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Lattice structures composed of periodic solid frames and pores can beutilized in energy absorption applications due to their high specific strengthand large deformation. However, these structures typically suffer frompost-yield softenings originating from the limited plasticity of availablematerial choices. This study aims to resolve such an issue by fabricatinglattice structures made of ductile pure copper (Cu). For the first time, Culattice structures are fabricated through laser-powder bed fusion (L-PBF) withgreen laser ({\lambda} = 515 nm). Structural and microstructural analysisconfirm that the lattice structures consist of well-defined unit cells and showdense microstructure. The deformation behavior is investigated under a widerange of strain rates from ~0.001 /s to ~1000 /s. The stress-strain curvesexhibit a smooth and continuous deformation without any post-yield softening,which can be attributed to the intrinsic mechanical properties of Cu.Correlated with post-mortem microscopy examination, the rate-dependentdeformation behavior of pure Cu lattice structures is investigated andrationalized. The current work suggests that the complex Cu architectures canbe fabricated by L-PBF with green laser and the lattice structures made ofductile metal are suitable for dynamic loading applications.

Green laser powder bed fusion based fabrication and rate-dependent mechanical properties of copper lattices