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Laser Powder Bed Fusion of Si and TiB2 Co-Modified Al-Mn-Mg-Sc-Zr Alloy: Microstructure and Mechanical Properties.

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Title:	Laser Powder Bed Fusion of Si and TiB2 Co-Modified Al-Mn-Mg-Sc-Zr Alloy: Microstructure and Mechanical Properties.
Authors:	Wei, Tianshuo¹ (AUTHOR), Geng, Yaoxiang¹ (AUTHOR) yaoxianggeng@163.com, Jin, Ziting¹ (AUTHOR), Chen, Yongkang¹ (AUTHOR), Zhang, Zhijie¹ (AUTHOR)
Source:	JOM: The Journal of The Minerals, Metals & Materials Society (TMS). Apr2026, Vol. 78 Issue 4, p2990-3002. 13p.
Subjects:	Microstructure, Mechanical behavior of materials, Aluminum alloys, Selective laser melting, Alloys, Grain refinement, Precipitation hardening
Abstract:	A novel in situ Si and TiB2 co-modified low Sc content Al-Mn-Mg-Sc-Zr aluminum alloy via laser powder bed fusion (LPBF) has been fabricated. The results demonstrated that the incorporation of Si and TiB2 promoted the formation of a smooth upper surface, refined the grain size, and improved the fluidity of the melt, which enabled the production of a dense LPBF alloy free of cracks and keyholes. The alloy exhibited a bimodal grain structure with Mg2Si, α-Al(Mn,Fe)Si, Al3(Sc,Zr), and AlSi2Sc2 precipitates embedded at the grain boundaries. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the as-built sample were 282 ± 7 MPa, 316 ± 20 MPa, and 4.5 ± 1.3%, respectively. The strength of the alloy was higher than that of the LPBF Al-Mn-Mg-Sc-Zr matrix alloy. After direct aging treatment of the alloy at 350°C for 2 h, the secondary Al3Sc and AlSi2Sc2 nanoparticles precipitated from the α-Al matrix, achieving a synergistic enhancement in both strength and plasticity with YS of 293 ± 4 MPa, UTS of 325 ± 11 MPa, and elongation of 13.0 ± 3.0%. [ABSTRACT FROM AUTHOR]
	Copyright of JOM: The Journal of The Minerals, Metals & Materials Society (TMS) is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database:	Engineering Source

Description
Abstract:	A novel in situ Si and TiB2 co-modified low Sc content Al-Mn-Mg-Sc-Zr aluminum alloy via laser powder bed fusion (LPBF) has been fabricated. The results demonstrated that the incorporation of Si and TiB2 promoted the formation of a smooth upper surface, refined the grain size, and improved the fluidity of the melt, which enabled the production of a dense LPBF alloy free of cracks and keyholes. The alloy exhibited a bimodal grain structure with Mg2Si, α-Al(Mn,Fe)Si, Al3(Sc,Zr), and AlSi2Sc2 precipitates embedded at the grain boundaries. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the as-built sample were 282 ± 7 MPa, 316 ± 20 MPa, and 4.5 ± 1.3%, respectively. The strength of the alloy was higher than that of the LPBF Al-Mn-Mg-Sc-Zr matrix alloy. After direct aging treatment of the alloy at 350°C for 2 h, the secondary Al3Sc and AlSi2Sc2 nanoparticles precipitated from the α-Al matrix, achieving a synergistic enhancement in both strength and plasticity with YS of 293 ± 4 MPa, UTS of 325 ± 11 MPa, and elongation of 13.0 ± 3.0%. [ABSTRACT FROM AUTHOR]
ISSN:	10474838
DOI:	10.1007/s11837-025-07670-y