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Open AccessArticle

Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion

1
Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
2
Department of Space Flight Systems, JAXA (Japan Aerospace Exploration Agency), ISAS (Institute of Space and Astronautical Science), Yoshinodai, Chuo-ku, Sagamihara 252-5210, Japan
*
Author to whom correspondence should be addressed.
Materials 2020, 13(13), 2902; https://doi.org/10.3390/ma13132902
Received: 10 June 2020 / Revised: 23 June 2020 / Accepted: 25 June 2020 / Published: 28 June 2020
(This article belongs to the Special Issue New Materials and Understandings in Selective Laser Melting (SLM))
In the present study, in order to elucidate geometrical features dominating deformation behaviors and their associated compressive properties of lattice structures, AlSi10Mg lattice structures with three different unit cells were fabricated by laser powder bed fusion. Compressive properties were examined by compression and indentation tests, micro X-ray computed tomography (CT), together with finite element analysis. The truncated octahedron- unit cell (TO) lattice structures exhibited highest stiffness and plateau stress among the studied lattice structures. The body centered cubic-unit cell (BCC) and TO lattice structures experienced the formation of shear bands with stress drops, while the hexagon-unit cell (Hexa) lattice structure behaved in a continuous deformation and flat plateau region. The Hexa lattice structure densified at a smaller strain than the BCC and TO lattice structures, due to high density of the struts in the compressive direction. Static and high-speed indentation tests revealed that the TO and Hexa exhibited slight strain rate dependence of the compressive strength, whereas the BCC lattice structure showed a large strain rate dependence. Among the lattice structures in the present study, the TO lattice exhibited the highest energy absorption capacity comparable to previously reported titanium alloy lattice structures. View Full-Text
Keywords: powder bed fusion; lattice structure; AlSi10Mg alloy; mechanical property; finite element method powder bed fusion; lattice structure; AlSi10Mg alloy; mechanical property; finite element method
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Liu, X.; Sekizawa, K.; Suzuki, A.; Takata, N.; Kobashi, M.; Yamada, T. Compressive Properties of Al-Si Alloy Lattice Structures with Three Different Unit Cells Fabricated via Laser Powder Bed Fusion. Materials 2020, 13, 2902.

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