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Heat Treatments and Critical Quenching Rates in Additively Manufactured Al–Si–Mg Alloys
Open AccessArticle

Effect of Heat Treatment on Gradient Microstructure of AlSi10Mg Lattice Structure Manufactured by Laser Powder Bed Fusion

Department of Materials Process Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
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Materials 2020, 13(11), 2487; https://doi.org/10.3390/ma13112487
Received: 9 May 2020 / Revised: 23 May 2020 / Accepted: 27 May 2020 / Published: 29 May 2020
(This article belongs to the Special Issue New Materials and Understandings in Selective Laser Melting (SLM))
The present study addressed the effect of heat treatment process on microstructure of an AlSi10Mg lattice structure with a body-centered cubic unit cell manufactured via laser powder bed fusion (LPBF). The as-manufactured lattice specimen exhibited a unique cellular structure composing of primary α-Al phases bounded by α-Al/Si eutectic microstructure. A gradient microstructure (continuous microstructural changes) was found in the node and strut portions composed of the lattice specimen. The microstructure appears more equiaxed and coarser with approaching the bottom surface of both portions. The continuous microstructural changes contributed to a variation in hardness measured at different locations in the as-manufactured lattice specimen. Si particles finely precipitate in the primary α-Al phases, and eutectic Si particle coarsening occurs at an elevated temperature of 300 °C. The microstructural coarsening is more pronounced at a higher temperature. A number of significantly coarsened Si particles and a stable Fe-containing intermetallic phase (β-AlFeSi) were observed at all locations in 530 °C solution-treated specimen. The homogenous microstructure results in a constant hardness value independent of the location in the lattice specimen. These results provide new insights to control the compressive properties of the AlSi10Mg lattice structure manufactured via LPBF by subsequent heat treatment processes. View Full-Text
Keywords: additive manufacturing; heat treatment process; aluminum alloy; portions of lattice structure; microstructural coarsening additive manufacturing; heat treatment process; aluminum alloy; portions of lattice structure; microstructural coarsening
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MDPI and ACS Style

Liu, M.; Takata, N.; Suzuki, A.; Kobashi, M. Effect of Heat Treatment on Gradient Microstructure of AlSi10Mg Lattice Structure Manufactured by Laser Powder Bed Fusion. Materials 2020, 13, 2487.

AMA Style

Liu M, Takata N, Suzuki A, Kobashi M. Effect of Heat Treatment on Gradient Microstructure of AlSi10Mg Lattice Structure Manufactured by Laser Powder Bed Fusion. Materials. 2020; 13(11):2487.

Chicago/Turabian Style

Liu, Mulin; Takata, Naoki; Suzuki, Asuka; Kobashi, Makoto. 2020. "Effect of Heat Treatment on Gradient Microstructure of AlSi10Mg Lattice Structure Manufactured by Laser Powder Bed Fusion" Materials 13, no. 11: 2487.

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