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Title: | Microstructural evolution and strengthening mechanisms of a high-strength Al-Mg-Si alloy processed by laser powder bed fusion and ageing treatment |
Authors: | Wen, T Wang, J Li, Z Yang, F Liu, Z Yang, H Ji, S |
Keywords: | aluminium alloys;microstructure;mechanical properties;laser powder bed fusion;heat treatment |
Issue Date: | 10-Feb-2024 |
Publisher: | Elsevier |
Citation: | Wen, T. et al. (2024) 'Microstructural evolution and strengthening mechanisms of a high-strength Al-Mg-Si alloy processed by laser powder bed fusion and ageing treatment', Materials Characterization, 209, 113754, pp. 1 - 13. doi: 10.1016/j.matchar.2024.113754. |
Abstract: | In this work, the processability, microstructural evolution and mechanical properties of a novel crack-free Al-5.3 wt% Mg-3.3 wt% Si alloy fabricated by laser powder bed fusion (LPBF) were investigated systematically. The Al-5.3 wt% Mg-3.3 wt% Si alloy with low solidification range exhibits good processability and reaches a high relative density of 99.6% at the VED of 103.3 J/mm3. The hierarchical microstructure was featured by the fine α-Al matrix that contains the interaction between the nanosized Mg2Si eutectic and high-density dislocations in the as-LPBFed alloy, which delivers high yield strength of 374 MPa and elongation of 5.8% under as-LPBFed condition. The yield strength is further enhanced to 433 MPa under as-aged condition of 180 °C for 6 h. The property enhancement is associated with the precipitation of β'′ and β phase. However, the broken and coarsened Mg2Si eutectics as well as the reduction of dislocation density result in strength degradation after ageing exceeds 300 °C. |
Description: | Data availability: Data will be made available on request. |
URI: | https://bura.brunel.ac.uk/handle/2438/28551 |
DOI: | https://doi.org/10.1016/j.matchar.2024.113754 |
ISSN: | 1044-5803 |
Other Identifiers: | ORCiD: Shouxun Ji https://orcid.org/0000-0002-8103-8638 113754 |
Appears in Collections: | Brunel Centre for Advanced Solidification Technology (BCAST) |
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FullText.pdf | Embargoed until 10 February 2025 | 2.82 MB | Adobe PDF | View/Open |
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