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<p>Nearly complete-density AlSi10Mg/TiB<sub>2</sub> composites were successfully prepared using selective laser melting technology by adding 3 wt.% reinforcement and optimizing the parameters. Microstructure characterization and a microhardness test were conducted on the formed samples. As the laser energy density increased, the resulting density initially rose, reached a peak, and then declined (the highest peak value was 99.22%). Nearly fully dense specimens were eventually obtained. X-ray diffraction results showed that the increase in laser energy density reduced the interplanar spacing, and abundant Si atoms were dissolved to cause lattice distortion. Optical microscope and scanning electron microscope observations revealed that the microstructure of the matrix was fine and that a limited amount of Si particles precipitated from the grain boundaries. Moreover, the surface of the TiB<sub>2</sub> reinforcement was smooth, and the TiB<sub>2</sub> particles were uniformly distributed. The increase in microhardness may be ascribed to the combined effects of dislocation strengthening, fine-grain and Orowan strengthening, and load transfer.</p>

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Effect of the Addition of Trace TiB2 Particles on the Microstructure and Properties of SLM-Formed AlSi10Mg

  • 期刊论文

  • 发表日期：

    2025年2月24日

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  • Yuying Zhao,
  • Lihong Jiang,
  • Qilin Yang,
  • Xiaoying Lin,
  • Yida Zeng,
  • Zhiyong Li,
  • Yan Wang,
  • Guangping Wang,
  • Longfei Zeng,
  • Xin Hong,
  • Youfu Zhang

摘要

Nearly complete-density AlSi10Mg/TiB2 composites were successfully prepared using selective laser melting technology by adding 3 wt.% reinforcement and optimizing the parameters. Microstructure characterization and a microhardness test were conducted on the formed samples. As the laser energy density increased, the resulting density initially rose, reached a peak, and then declined (the highest peak value was 99.22%). Nearly fully dense specimens were eventually obtained. X-ray diffraction results showed that the increase in laser energy density reduced the interplanar spacing, and abundant Si atoms were dissolved to cause lattice distortion. Optical microscope and scanning electron microscope observations revealed that the microstructure of the matrix was fine and that a limited amount of Si particles precipitated from the grain boundaries. Moreover, the surface of the TiB2 reinforcement was smooth, and the TiB2 particles were uniformly distributed. The increase in microhardness may be ascribed to the combined effects of dislocation strengthening, fine-grain and Orowan strengthening, and load transfer.