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<p>AlSi10Mg, ZrB<sub>2</sub>/AlSi10Mg, and HCl-treated ZrB<sub>2</sub>/AlSi10Mg samples were successfully fabricated via laser-directed energy deposition (LDED) combined with ultrasonic inorganic acid washing. The surface oxides on ZrB<sub>2</sub> particles, primarily ZrO<sub>2</sub> and B<sub>2</sub>O<sub>3</sub>, deteriorate the wettability between ZrB<sub>2</sub> and aluminum, leading to particle agglomeration and weak interfacial bonding. Ultrasonic acid washing effectively removes these oxides, improving wettability, promoting uniform ZrB<sub>2</sub> distribution, refining matrix grains, optimizing ZrB<sub>2</sub>/Al interface bonding, and reducing defects in the aluminum matrix composites (AMCs). At room temperature, the LDED-fabricated AlSi10Mg sample exhibits an ultimate tensile strength (UTS) of 169.1&#xa0;MPa. The addition of ZrB<sub>2</sub> increases the UTS by 12.5% for the ZrB<sub>2</sub>/AlSi10Mg sample, while the HCl-treated ZrB<sub>2</sub>/AlSi10Mg sample shows a further 9.6% enhancement due to the synergistic effects of grain refinement, load transfer, and dislocation strengthening. Moreover, the LDED-fabricated AMCs demonstrate excellent high-temperature performance. At 400°C, the UTS of the AlSi10Mg sample sharply decreases to 27.9&#xa0;MPa with an elongation of 62.6%, whereas the ZrB<sub>2</sub>/AlSi10Mg sample retains a UTS of 69.4&#xa0;MPa and an elongation of 88%. Notably, the HCl-treated ZrB<sub>2</sub>/AlSi10Mg sample achieves an even higher UTS of 74.5&#xa0;MPa at 400°C.</p>

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Effect of Particle Surface Treatment on Microstructure and Properties of Laser-Directed Energy Deposition ZrB2/AlSi10Mg Composites

  • 期刊论文

  • 发表日期：

    2026年3月30日

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  • Jiangning Zhou,
  • Yida Zeng,
  • Longbo Chen,
  • Zhiyong Li,
  • Zemin Liu,
  • Yishu Song

摘要

AlSi10Mg, ZrB2/AlSi10Mg, and HCl-treated ZrB2/AlSi10Mg samples were successfully fabricated via laser-directed energy deposition (LDED) combined with ultrasonic inorganic acid washing. The surface oxides on ZrB2 particles, primarily ZrO2 and B2O3, deteriorate the wettability between ZrB2 and aluminum, leading to particle agglomeration and weak interfacial bonding. Ultrasonic acid washing effectively removes these oxides, improving wettability, promoting uniform ZrB2 distribution, refining matrix grains, optimizing ZrB2/Al interface bonding, and reducing defects in the aluminum matrix composites (AMCs). At room temperature, the LDED-fabricated AlSi10Mg sample exhibits an ultimate tensile strength (UTS) of 169.1 MPa. The addition of ZrB2 increases the UTS by 12.5% for the ZrB2/AlSi10Mg sample, while the HCl-treated ZrB2/AlSi10Mg sample shows a further 9.6% enhancement due to the synergistic effects of grain refinement, load transfer, and dislocation strengthening. Moreover, the LDED-fabricated AMCs demonstrate excellent high-temperature performance. At 400°C, the UTS of the AlSi10Mg sample sharply decreases to 27.9 MPa with an elongation of 62.6%, whereas the ZrB2/AlSi10Mg sample retains a UTS of 69.4 MPa and an elongation of 88%. Notably, the HCl-treated ZrB2/AlSi10Mg sample achieves an even higher UTS of 74.5 MPa at 400°C.