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<p>This study investigates the micro-hole drilling performance of an in-situ aluminium matrix composite reinforced with 10 wt% titanium diboride (TiB<sub>2</sub>) using a pulsed Nd: YAG laser. Multiple trials were conducted to ascertain suitable laser micro-drilling parameters. The primary analysis was conducted at a fixed laser power of 250&#xa0;W and a pulse frequency of 5&#xa0;kHz, with the scanning speed varied to assess its effect on hole morphology and surface integrity. A scanning speed of 20&#xa0;mm/s was identified as optimal for minimizing the recast layer, reducing the heat-affected zone, and enhancing hole dimensional accuracy. Morphological and subsurface features were analyzed using Field-Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM), revealing grain refinement and interface modifications induced by rapid thermal cycling during laser processing. Under these conditions, the drilled micro-holes exhibited entrance and exit diameters of approximately 314&#xa0;μm and 287&#xa0;μm, respectively, corresponding to a taper angle of about 0.4° and an aspect ratio of roughly 6.7. The hole walls exhibited enhanced surface integrity, characterized by a surface roughness (Ra) of 10.8&#xa0;μm and a maximum microhardness of 118.3 HV at the hole center. These findings highlight the potential of pulsed Nd: YAG laser micro-trepanning for precision micromachining of TiB₂-reinforced aluminium composites.</p>

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Effect of Nd: YAG laser micro-trepanning drilling on the microstructure development of aluminium–TiB2 composites

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • Girisankar Thottathil Mana Raman,
  • Jebaraj David Raja Selvam,
  • Thomas Anita Jones Mary Puspha,
  • Peter Madindwa Mashinini,
  • David Arul Kirubakaran

摘要

This study investigates the micro-hole drilling performance of an in-situ aluminium matrix composite reinforced with 10 wt% titanium diboride (TiB2) using a pulsed Nd: YAG laser. Multiple trials were conducted to ascertain suitable laser micro-drilling parameters. The primary analysis was conducted at a fixed laser power of 250 W and a pulse frequency of 5 kHz, with the scanning speed varied to assess its effect on hole morphology and surface integrity. A scanning speed of 20 mm/s was identified as optimal for minimizing the recast layer, reducing the heat-affected zone, and enhancing hole dimensional accuracy. Morphological and subsurface features were analyzed using Field-Emission Scanning Electron Microscopy (FESEM) and Transmission Electron Microscopy (TEM), revealing grain refinement and interface modifications induced by rapid thermal cycling during laser processing. Under these conditions, the drilled micro-holes exhibited entrance and exit diameters of approximately 314 μm and 287 μm, respectively, corresponding to a taper angle of about 0.4° and an aspect ratio of roughly 6.7. The hole walls exhibited enhanced surface integrity, characterized by a surface roughness (Ra) of 10.8 μm and a maximum microhardness of 118.3 HV at the hole center. These findings highlight the potential of pulsed Nd: YAG laser micro-trepanning for precision micromachining of TiB₂-reinforced aluminium composites.