2024-03-29T02:20:27Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00030465
2023-01-16T04:23:58Z
320:321:322
Anomalous strengthening by supersaturated solid solutions of selectively laser melted Al–Si-based alloys
Takata, Naoki
Liu, Mulin
Kodaira, Hirohisa
Suzuki, Asuka
Kobashi, Makoto
open access
© 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Additive manufacturing
Aluminum alloy
Strain hardening
Rapid solidification
Transmission electron microscopy
To identify the dominant contributing factor in the anomalously high strength of Al–Si-based alloys fabricated by selective laser melting (SLM), microstructural characteristics of a SLM-built Al–10Si–0.3 Mg alloy (AlSi10Mg) and their changes upon annealing at elevated temperatures were investigated. The as-built AlSi10Mg alloy exhibits a peculiar microstructure comprising of a number of columnar α-Al (fcc) phase with concentrated Si in solution. Numerous nano-sized particles were observed within the α-Al matrix. At elevated temperatures, a number of Si phase (diamond structure) precipitates consumed the solute Si in the columnar α-Al phase, but the microstructure of the α-Al matrix changed slightly. After annealing at elevated temperatures, the tensile strength of the as-built AlSi10Mg alloy substantially decreased accompanied by a reduction in the strain hardening rate. The supersaturated solid solution of the α-Al phase containing numerous nano-sized particles enhanced the strain hardening, resulting in the anomalous strengthening of the SLM-built AlSi10Mg alloy. The microstructural features were formed due to rapid solidification at an extremely high cooling rate in the SLM process, which provides important insights into controlling the strength of Al–Si-based alloys fabricated by SLM.
ファイル公開日: 2022/05/01
Elsevier
2020-05
eng
journal article
AM
http://hdl.handle.net/2237/00032650
https://nagoya.repo.nii.ac.jp/records/30465
https://doi.org/10.1016/j.addma.2020.101152
2214-8604
Additive Manufacturing
33
101152
https://nagoya.repo.nii.ac.jp/record/30465/files/ADDMA_2019_1525.pdf
application/pdf
7.5 MB
2022-05-01