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<p>This research investigates the preparation of in situ (TiB + La<sub>2</sub>O<sub>3</sub>)/Ti matrix composites using selective laser melting (SLM) technique and examines the microstructure and mechanical properties of the as-built samples. It was found that LaB<sub>6</sub> reacts with the Ti matrix, leading to the precipitation of partially dispersed nanoscale La<sub>2</sub>O<sub>3</sub> and TiB reinforcing phases during SLM process. An increase in LaB<sub>6</sub> content under the same process parameters results in an increase in cracks and unfused powder in the melt channel, which reduces the forming quality and relative densities. When laser power and scanning speed are increased, the relative density of LaB<sub>6</sub>-reinforced titanium matrix composite (TMC) samples with different compositions initially improves but then decreases. Moreover, the tensile strength of LaB<sub>6</sub>-reinforced composites reaches 420&#xa0;MPa at 400&#xa0;°C, showing a significant improvement in performance compared to pure Ti (TA2). This enhancement is attributed to the incorporation of TiB whiskers and La<sub>2</sub>O<sub>3</sub> particles, which refine TA2 structure.</p>

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Microstructure and High-Temperature Performance of (TiB + La2O3)/Ti Matrix Composites Fabricated by Selective Laser Melting

  • 期刊论文

  • 发表日期：

    2025年5月28日

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  • Dingjin Zou,
  • Liang Zhang,
  • Chuhan Gao,
  • Dong Zhu,
  • Xinxin Liu,
  • Wenheng Wu,
  • Tao Wang,
  • Xiaoqing Ni,
  • Qiyun Yang,
  • Shilei Li

摘要

This research investigates the preparation of in situ (TiB + La2O3)/Ti matrix composites using selective laser melting (SLM) technique and examines the microstructure and mechanical properties of the as-built samples. It was found that LaB6 reacts with the Ti matrix, leading to the precipitation of partially dispersed nanoscale La2O3 and TiB reinforcing phases during SLM process. An increase in LaB6 content under the same process parameters results in an increase in cracks and unfused powder in the melt channel, which reduces the forming quality and relative densities. When laser power and scanning speed are increased, the relative density of LaB6-reinforced titanium matrix composite (TMC) samples with different compositions initially improves but then decreases. Moreover, the tensile strength of LaB6-reinforced composites reaches 420 MPa at 400 °C, showing a significant improvement in performance compared to pure Ti (TA2). This enhancement is attributed to the incorporation of TiB whiskers and La2O3 particles, which refine TA2 structure.