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<p>Selective laser melting (SLM) is an advanced additive manufacturing technique that enables the fabrication of complex metal components with high density, precision, and design flexibility. A novel Sc-free Al–4.58Mg–1.17Mn–1.59Zr–1.45Ti alloy was successfully fabricated via SLM, achieving a relative density of ~ 99.89%. The microstructure of the as-fabricated alloy was characterized by scanning electron microscopy and transmission electron microscopy, which revealed refined equiaxed grains, a high density of low-angle grain boundaries and dislocation structures, as well as Mg segregation along grain boundaries. Additionally, a variety of dispersed precipitates were identified, including Mg-containing oxides, L1<sub>2</sub>–Al<sub>3</sub>(Ti<sub><i>x</i></sub>, Zr<sub>1−<i>x</i></sub>), and Al<sub>3</sub>Zr particles. Room-temperature tensile tests showed that the alloy exhibits an excellent combination of strength and ductility, with a yield strength of 453.2 ± 12&#xa0;MPa, an ultimate tensile strength of 515.1 ± 8&#xa0;MPa, and an elongation of 22.5% ± 0.3%. The high strength was attributed to the combined effects of grain boundary strengthening, solid solution strengthening, precipitation strengthening, and dislocation strengthening. The developed Sc-free Al–Mg–Mn–Zr–Ti alloy demonstrates significant potential as an economical high-strength lightweight material for SLM-based manufacturing applications.</p>

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A novel Al–Mg–Mn–Zr–Ti alloy with an excellent strength-ductility combination prepared via selective laser melting

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Qing Zhao,
  • Chun-Lu Zhao,
  • Yu-Hang Wu,
  • Ying Han,
  • Zhen-Min Li,
  • Jia-Peng Sun,
  • Wei-Wei Zhu,
  • Xu Ran

摘要

Selective laser melting (SLM) is an advanced additive manufacturing technique that enables the fabrication of complex metal components with high density, precision, and design flexibility. A novel Sc-free Al–4.58Mg–1.17Mn–1.59Zr–1.45Ti alloy was successfully fabricated via SLM, achieving a relative density of ~ 99.89%. The microstructure of the as-fabricated alloy was characterized by scanning electron microscopy and transmission electron microscopy, which revealed refined equiaxed grains, a high density of low-angle grain boundaries and dislocation structures, as well as Mg segregation along grain boundaries. Additionally, a variety of dispersed precipitates were identified, including Mg-containing oxides, L12–Al3(Tix, Zr1−x), and Al3Zr particles. Room-temperature tensile tests showed that the alloy exhibits an excellent combination of strength and ductility, with a yield strength of 453.2 ± 12 MPa, an ultimate tensile strength of 515.1 ± 8 MPa, and an elongation of 22.5% ± 0.3%. The high strength was attributed to the combined effects of grain boundary strengthening, solid solution strengthening, precipitation strengthening, and dislocation strengthening. The developed Sc-free Al–Mg–Mn–Zr–Ti alloy demonstrates significant potential as an economical high-strength lightweight material for SLM-based manufacturing applications.