Abstract
In the present study, microstructural characteristics, compression behavior and energy absorption property of AlSi10Mg Octet Truss, FCC and Tetra lattice structures with volume fraction of 30%, 50%, and 70% produced using Laser-based powder bed fusion (L-PBF) method have been investigated. Proper selection of processing parameters for L-PBF enables high internal and surface quality even though node and strut in the lattice structure are very thin. AlSi10Mg lattice structure consists of a cellular structure composed of α-Al and intercellular eutectic Si. With heat treatment, needle shape Mg2Si precipitates in the α-Al matrix. Octet Truss, FCC and Tetra lattice structures show similar compression fracture behavior. The maximum fracture forces for Octet Truss, FCC and Tetra lattice structures (70% volume fraction) are 22.0 kN, 23.7 kN and 23.7 kN, respectively, while the energy absorption values up to 8 mm displacement are 128.1 J, 126.0 J and 88.9 J, respectively. With heat treatment, the maximum fracture force and the absorbed energy decreased when compared to those in as-built condition. When considering application of AlSi10Mg alloy lattice structure in shock absorbing part, FCC lattice structure with 70% volume fraction exhibits the most optimum combination of mechanical property and shock absorption characteristics.
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Acknowledgements
This work was supported by the Material component technology development project, NTIS 1415180233, KEIT 20020283, Development of 3.0 GPa% grade aluminum alloy and casting analysis technology for high vacuum die casting, funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea), and by Hyundai Motor Group.
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Supplementary Fig. S1 X-ray diffraction patterns obtained from AlSi10Mg Octet Truss lattice structure sample with volume fraction of 70 % in as-built condition and after heat treatment at 270 ℃ for 1.5 h and 4.5 h, Supplementary Fig. S2 Engineering stress-strain curves obtained from as-built bulk and heat-treatment. (PPTX 559 KB)
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Joo, H.M., Kim, W.C., Jung, Y.I. et al. Effect of Cell Geometry and Heat Treatment on the Energy Absorption Property of AlSi10Mg Alloy Lattice Structures Produced by Laser-Based Powder Bed Fusion. Met. Mater. Int. 30, 1294–1306 (2024). https://doi.org/10.1007/s12540-023-01567-8
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DOI: https://doi.org/10.1007/s12540-023-01567-8