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<p>This study verified the feasibility of preparing TiB<sub>2</sub>/AlSi10Mg composites by LDED, clarified its strengthening mechanism, and significantly improved the mechanical properties through process optimization. The microstructure and mechanical properties of the composites with different TiB<sub>2</sub> additions (0.4%) and different energy densities (60&#xa0;J/mm<sup>2</sup>, 80&#xa0;J/mm<sup>2</sup>, 100&#xa0;J/mm<sup>2</sup>) were compared. The results show that the average microhardness and comprehensive tensile properties of the composites increase first and then decrease with the increase of laser power due to the Marangoni convection and solidification front shift and capture effect, affecting the release state of TiB<sub>2</sub> and the grain size of the matrix. The TiB<sub>2</sub>/AlSi10Mg composite prepared under 80&#xa0;J/mm<sup>2</sup> had the highest density of approximately 93.98%, with the best average microhardness and overall tensile properties, being 108.19&#xa0;HV (21.15% higher than the LDED-prepared aluminum alloy), a yield strength of 122.03&#xa0;MPa, and an ultimate tensile strength of 252.55&#xa0;MPa (increased by 48.78% and 23.18%, respectively). Therefore, this study provides a reference for promoting the application of LDED technology in the field of aluminum matrix composite manufacturing.</p>

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Energy Density Modulation for Enhanced Microstructure and Properties of Laser-Directed Energy Deposited TiB2/AlSi10Mg Composites

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • Yida Zeng,
  • Yishu Song,
  • Qilin Yang,
  • Zhiyong Li,
  • Lihong Jiang,
  • Xiaoying Lin,
  • Yan Wang,
  • Xin Hong,
  • Youfu Zhang,
  • Longfei Zeng

摘要

This study verified the feasibility of preparing TiB2/AlSi10Mg composites by LDED, clarified its strengthening mechanism, and significantly improved the mechanical properties through process optimization. The microstructure and mechanical properties of the composites with different TiB2 additions (0.4%) and different energy densities (60 J/mm2, 80 J/mm2, 100 J/mm2) were compared. The results show that the average microhardness and comprehensive tensile properties of the composites increase first and then decrease with the increase of laser power due to the Marangoni convection and solidification front shift and capture effect, affecting the release state of TiB2 and the grain size of the matrix. The TiB2/AlSi10Mg composite prepared under 80 J/mm2 had the highest density of approximately 93.98%, with the best average microhardness and overall tensile properties, being 108.19 HV (21.15% higher than the LDED-prepared aluminum alloy), a yield strength of 122.03 MPa, and an ultimate tensile strength of 252.55 MPa (increased by 48.78% and 23.18%, respectively). Therefore, this study provides a reference for promoting the application of LDED technology in the field of aluminum matrix composite manufacturing.