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<p>This research investigates the electrical discharge machining (EDM) performance of AA7475-TiB<sub>2</sub> metal matrix composites using a sustainable biocarbon-activated green dielectric. Biocarbon was produced from mangosteen husk waste through slow pyrolysis and surface-treated with silane to enhance its dispersion in deionized water. The influence of different dielectric conditions on material removal rate (MRR), tool wear rate (TWR), and surface roughness (Ra) was evaluated. The biocarbon-activated dielectric achieved the highest machining performance, with a maximum MRR of 10.82 mm<sup>3</sup>/min, while simultaneously reducing tool wear and surface roughness compared to conventional dielectrics. Scanning electron microscopy (SEM) confirmed improved surface integrity with fewer defects under biocarbon-assisted EDM. The results demonstrate the effectiveness of biocarbon-based green dielectrics for efficient and sustainable machining of high-strength MMCs.</p>

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EDM performance of mangosteen waste husk derived biocarbon activated green dielectric on AA7475-TiB2 metal matrix composite

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • N. Gayathri,
  • S. Velmurugan,
  • S. Sathishkumar,
  • B. Benix Sajo,
  • S. Selvam

摘要

This research investigates the electrical discharge machining (EDM) performance of AA7475-TiB2 metal matrix composites using a sustainable biocarbon-activated green dielectric. Biocarbon was produced from mangosteen husk waste through slow pyrolysis and surface-treated with silane to enhance its dispersion in deionized water. The influence of different dielectric conditions on material removal rate (MRR), tool wear rate (TWR), and surface roughness (Ra) was evaluated. The biocarbon-activated dielectric achieved the highest machining performance, with a maximum MRR of 10.82 mm3/min, while simultaneously reducing tool wear and surface roughness compared to conventional dielectrics. Scanning electron microscopy (SEM) confirmed improved surface integrity with fewer defects under biocarbon-assisted EDM. The results demonstrate the effectiveness of biocarbon-based green dielectrics for efficient and sustainable machining of high-strength MMCs.