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<p>The low-density refractory high-entropy alloy AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr exhibits excellent high-temperature performance, making it an effective substitute for nickel-based superalloys, with potential applications in high-temperature aerospace components. In this study, bulk AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr refractory high-entropy alloy samples are prepared by laser metal deposition (LMD). The effects of laser energy density on the density, surface morphology, and microstructure of AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr are analyzed, elucidating the LMD formation mechanism of this alloy. The results indicate that optimizing the laser energy density improves the density of the LMD-formed AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr refractory high-entropy alloy. As the laser energy density increased to 102&#xa0;J/mm², the cellular crystals and columnar dendrites coarsen. Significant changes in the concentrations of Al and Zr elements result in the formation of four typical regions in the LMD-formed AlMo<sub>0.5</sub>NbTa<sub>0.5</sub>TiZr: the LP region rich in the Al<sub>3</sub>Zr<sub>4</sub> phase, the DR region rich in Mo-Nb-Ta (BCC-1 phase), and the FR and ID regions rich in Al-Zr-Ti (BCC-2 phase).</p>

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Effects of laser energy density on the density, surface morphology, and microstructure of AlMo0.5NbTa0.5TiZr fabricated by laser metal deposition

  • 期刊论文

  • 发表日期：

    2025年9月26日

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  • Bingbing Sun,
  • Bingqing Chen,
  • Junjie Gao,
  • Feng Zhang,
  • Lingti Kong,
  • Jinfu Li

摘要

The low-density refractory high-entropy alloy AlMo0.5NbTa0.5TiZr exhibits excellent high-temperature performance, making it an effective substitute for nickel-based superalloys, with potential applications in high-temperature aerospace components. In this study, bulk AlMo0.5NbTa0.5TiZr refractory high-entropy alloy samples are prepared by laser metal deposition (LMD). The effects of laser energy density on the density, surface morphology, and microstructure of AlMo0.5NbTa0.5TiZr are analyzed, elucidating the LMD formation mechanism of this alloy. The results indicate that optimizing the laser energy density improves the density of the LMD-formed AlMo0.5NbTa0.5TiZr refractory high-entropy alloy. As the laser energy density increased to 102 J/mm², the cellular crystals and columnar dendrites coarsen. Significant changes in the concentrations of Al and Zr elements result in the formation of four typical regions in the LMD-formed AlMo0.5NbTa0.5TiZr: the LP region rich in the Al3Zr4 phase, the DR region rich in Mo-Nb-Ta (BCC-1 phase), and the FR and ID regions rich in Al-Zr-Ti (BCC-2 phase).