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<p>Optimization of scanning paths in laser additive manufacturing (LAM) is one of the key approaches to enhancing the quality and performance of metal components. In this study, the AlCoCrFeNi<sub>2.1</sub> high-entropy alloy was fabricated via laser powder bed fusion (LPBF) using six distinct scanning strategies. These include uniform rotation (0°, 67°, and 90°), strip mixed scanning (1&#xa0;mm), and checkerboard mixed scanning (1 and 5&#xa0;mm). The research reveals the evolution patterns of microstructure and mechanical properties induced by these different strategies. The results indicate that the 67° rotation scanning strategy achieved the lowest surface roughness (4.25&#xa0;<i>μ</i>m). Compared to other scanning strategies, the 5-mm checkerboard mixed scanning strategy exhibits superior tensile properties, with a yield strength of 1112 ± 8.6&#xa0;MPa, an ultimate tensile strength of 1351 ± 15.8&#xa0;MPa, an elongation of 15.16 ± 1.3%, and higher impact toughness (31&#xa0;J). Based on the mechanisms revealed in this study, the laser scanning path in LPBF can be optimized more rationally, thereby providing key guidance for the selection of process parameters in laser additive manufacturing (LAM) of high-entropy alloys.</p>

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Effect of Different Scanning Strategies on Microstructure and Mechanical Properties of Laser Powder Bed Fusion-Fabricated AlCoCrFeNi2.1

  • 期刊论文

  • 发表日期：

    2026年7月18日

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  • Chao Sun,
  • Zeqin Cui,
  • Liwei Lan,
  • Xiaohu Hao,
  • Weiguo Li,
  • Wenxian Wang

摘要

Optimization of scanning paths in laser additive manufacturing (LAM) is one of the key approaches to enhancing the quality and performance of metal components. In this study, the AlCoCrFeNi2.1 high-entropy alloy was fabricated via laser powder bed fusion (LPBF) using six distinct scanning strategies. These include uniform rotation (0°, 67°, and 90°), strip mixed scanning (1 mm), and checkerboard mixed scanning (1 and 5 mm). The research reveals the evolution patterns of microstructure and mechanical properties induced by these different strategies. The results indicate that the 67° rotation scanning strategy achieved the lowest surface roughness (4.25 μm). Compared to other scanning strategies, the 5-mm checkerboard mixed scanning strategy exhibits superior tensile properties, with a yield strength of 1112 ± 8.6 MPa, an ultimate tensile strength of 1351 ± 15.8 MPa, an elongation of 15.16 ± 1.3%, and higher impact toughness (31 J). Based on the mechanisms revealed in this study, the laser scanning path in LPBF can be optimized more rationally, thereby providing key guidance for the selection of process parameters in laser additive manufacturing (LAM) of high-entropy alloys.