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<p>Dense and crack-free eutectic Al<sub>16.2</sub>Co<sub>30.3</sub>Cr<sub>9.7</sub>Fe<sub>10.4</sub>Ni<sub>30.7</sub>W<sub>2.2</sub>C<sub>0.6</sub> multi-principal element alloy (MPEA) was additively manufactured using powder bed fusion-laser beam (PBF-LB). The MPEA powders were produced by gas atomization using an in-house laboratory scale gas atomizer. PBF-LB parameters were optimized by exploring laser powers ranging from 200 to 350 W, and scan speeds varying from 300 to 1800 mm/s. The as-fabricated alloy exhibited a two-phase eutectic microstructure with alternating FCC and BCC phases interspersed by cellular dendrites. This unique nano-scale microstructure exhibited remarkable tensile strength, yield strength, and elongation of ~1.6 GPa, ~1.3 GPa, and ~10%, respectively. These are comparable to those reported for transition metal high entropy and/or multi-principal element alloys fabricated using either PBF-LB or traditional processing methods, underscoring the potential of this novel eutectic MPEA produced by additive manufacturing technology for engineering applications where stainless steels and Ni-base superalloys dominate.</p>

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High strength eutectic multi-principal element alloy additively manufactured by powder bed fusion-laser beam

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月12日

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  • Thinh Huynh,
  • Kevin Graydon,
  • Tanner Olson,
  • Amberlee Haselhuhn,
  • Marko Knezevic,
  • Yongho Sohn

摘要

Dense and crack-free eutectic Al16.2Co30.3Cr9.7Fe10.4Ni30.7W2.2C0.6 multi-principal element alloy (MPEA) was additively manufactured using powder bed fusion-laser beam (PBF-LB). The MPEA powders were produced by gas atomization using an in-house laboratory scale gas atomizer. PBF-LB parameters were optimized by exploring laser powers ranging from 200 to 350 W, and scan speeds varying from 300 to 1800 mm/s. The as-fabricated alloy exhibited a two-phase eutectic microstructure with alternating FCC and BCC phases interspersed by cellular dendrites. This unique nano-scale microstructure exhibited remarkable tensile strength, yield strength, and elongation of ~1.6 GPa, ~1.3 GPa, and ~10%, respectively. These are comparable to those reported for transition metal high entropy and/or multi-principal element alloys fabricated using either PBF-LB or traditional processing methods, underscoring the potential of this novel eutectic MPEA produced by additive manufacturing technology for engineering applications where stainless steels and Ni-base superalloys dominate.