Effect of electrical-discharging on formation of nanoporous biocompatible layer on titanium

Pei Wen Peng, Keng Liang Ou, Hsi Chen Lin, Yung Ning Pan, Chau Hsiang Wang

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)


In this study, we performed an electrical discharge machining (EDM), by which a recast layer was formed on a titanium surface. Subsequently, an α-phase and a γ-TiH-(γ-hydride)-phase were formed on the recast layer by electrical-discharging. Nano-(δ + γ) hydrides play important roles in the formation of nanostructural oxide layers. Electrical-discharging not only generates a nanostructural recast layer but also converts the alloy surface into a nanostructured oxide surface, which increases the alloy biocompatibility. A γ-hydride microstructure was also formed on the recast layer following electrical-discharging. The microstructure had a tetragonal structure with lattice constant a = 0.421 nm. In the recast layer, a transition, α → (α + δ) → (δ + γ) → γ, occurred during electrical-discharging. This result has never been previously reported. The recast layer that contains nanophases was dissolved during electrical-discharging; by this process, electrical-discharging for a short duration yields nanoporous TiO2. Hence, electric discharging for a short duration leads to the production of nanostructures as well as bioactive titanium.

Original languageEnglish
Pages (from-to)625-630
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - Mar 4 2010


  • Electrical-discharging
  • Nanophase
  • Recast layer
  • Titanium alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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