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25-11-2023

Effect of Cell Geometry and Heat Treatment on the Energy Absorption Property of AlSi10Mg Alloy Lattice Structures Produced by Laser-Based Powder Bed Fusion

Authors: Hyo Moon Joo, Woo Chul Kim, Youn Il Jung, Han Jae Kim, Seong Jin Kim, Yeong Cheol Jo, Wang Hyun Yong, Do Hyang Kim

Published in: Metals and Materials International | Issue 5/2024

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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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Metadata
Title
Effect of Cell Geometry and Heat Treatment on the Energy Absorption Property of AlSi10Mg Alloy Lattice Structures Produced by Laser-Based Powder Bed Fusion
Authors
Hyo Moon Joo
Woo Chul Kim
Youn Il Jung
Han Jae Kim
Seong Jin Kim
Yeong Cheol Jo
Wang Hyun Yong
Do Hyang Kim
Publication date
25-11-2023
Publisher
The Korean Institute of Metals and Materials
Published in
Metals and Materials International / Issue 5/2024
Print ISSN: 1598-9623
Electronic ISSN: 2005-4149
DOI
https://doi.org/10.1007/s12540-023-01567-8

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