Selected Laser Melting Forming Inlaid Lattice Structure and Mechanical Properties

Lattice structures have garnered extensive attention for their lightweight properties and high-energy absorption capacity. The inlaid lattice structure, comprising interconnected unit cells, enhances mechanical behavior through inlaying. AlSi10Mg powder served as the material, and FB/BF inlaid lattice structures incorporating body-centered cubic (BCC) and face-centered cubic (FCC) unit cells were fabricated via selective laser melting. Mechanical properties and fracture modes were subsequently analyzed. Results indicate that reducing strut diameter degrades the mechanical properties of FB and BF structures. The BF structure decreases to <68% of its original properties, while FB retains >86% when the BCC-strut diameter is reduced. FB exhibits superior mechanical properties, with maximum yield strengths of 112 MPa (FB) and 105 MPa (BF), exceeding those of uniform BCC structures at identical relative densities. Under compression, the structure fails initially through layer-by-layer fracture, then fractures at ∼45°, showing a mixed fracture mode characterized predominantly by ductile fracture with a minor contribution of brittle fracture.