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<p>A novel in situ Si and TiB<sub>2</sub> 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 TiB<sub>2</sub> 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 Mg<sub>2</sub>Si, <i>α</i>-Al(Mn,Fe)Si, Al<sub>3</sub>(Sc,Zr), and AlSi<sub>2</sub>Sc<sub>2</sub> precipitates embedded at the grain boundaries. The yield strength (YS), ultimate tensile strength (UTS), and elongation of the as-built sample were 282 ± 7&#xa0;MPa, 316 ± 20&#xa0;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&#xa0;h, the secondary Al<sub>3</sub>Sc and AlSi<sub>2</sub>Sc<sub>2</sub> nanoparticles precipitated from the <i>α</i>-Al matrix, achieving a synergistic enhancement in both strength and plasticity with YS of 293 ± 4&#xa0;MPa, UTS of 325 ± 11&#xa0;MPa, and elongation of 13.0 ± 3.0%.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月28日

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  • Tianshuo Wei,
  • Yaoxiang Geng,
  • Ziting Jin,
  • Yongkang Chen,
  • Zhijie Zhang

摘要

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%.