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<p>To solve the reliability of AlCoCrFeNi<sub>2.1</sub> HEA components during connection, laser welding technology with high energy density and fast cooling has been adopted to weld AlCoCrFeNi<sub>2.1</sub> alloy plates. The influence of laser power and welding speed on the microstructures and mechanical properties of the weld joints has been investigated. The phase composition of both the joint and the base metal was similar. The microstructures of the joint primarily exhibited a layered structure with reduced interlayer spacing. Reticular and cellular structures were fewer, resulting in a more uniform property distribution across the joint. After welding, the elemental distribution became more homogeneous, and the structural segregation of elements was notably improved. The optimal joint exhibited a tensile stress of 863&#xa0;MPa and an elongation of 14%, achieving approximately 90% of the properties of base metal. Integrating finite element analysis showed that the weld pool shape transitions from a circular form to a “duck egg” shape, ultimately displaying a water ripple pattern. The maximum stress region was located in the arc area in front of the welding heat source and the central portion of the weld. This research will provide theoretical guidance for the further applications of AlCoCrFeNi<sub>2.1</sub> in structural materials.</p>

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Laser Welded Joint of AlCoCrFeNi2.1 Alloy with Excellent Mechanical Properties Based on Experiment and Finite Element Simulation

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Jiu-Ming Pei,
  • Teng Liu,
  • Hong-Mei Li,
  • Zhi-Sheng Nong,
  • Xue Cui,
  • Kan Su,
  • Rong-Zheng Xu,
  • Moliar Oleksandr

摘要

To solve the reliability of AlCoCrFeNi2.1 HEA components during connection, laser welding technology with high energy density and fast cooling has been adopted to weld AlCoCrFeNi2.1 alloy plates. The influence of laser power and welding speed on the microstructures and mechanical properties of the weld joints has been investigated. The phase composition of both the joint and the base metal was similar. The microstructures of the joint primarily exhibited a layered structure with reduced interlayer spacing. Reticular and cellular structures were fewer, resulting in a more uniform property distribution across the joint. After welding, the elemental distribution became more homogeneous, and the structural segregation of elements was notably improved. The optimal joint exhibited a tensile stress of 863 MPa and an elongation of 14%, achieving approximately 90% of the properties of base metal. Integrating finite element analysis showed that the weld pool shape transitions from a circular form to a “duck egg” shape, ultimately displaying a water ripple pattern. The maximum stress region was located in the arc area in front of the welding heat source and the central portion of the weld. This research will provide theoretical guidance for the further applications of AlCoCrFeNi2.1 in structural materials.