Surface modification induced phase transformation and structure variation on the rapidly solidified recast layer of titanium

Ming Hung Tsai, Chiung Fang Haung, Shih Shiun Shyu, Yen Ru Chou, Ming Hong Lin, Pei Wen Peng, Keng Liang Ou, Chih Hua Yu

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Abstract In this study, neodymium-doped yttrium orthovanadate (Nd:YVO4) as a laser source with different scanning speeds was used on biomedical Ti surface. The microstructural and biological properties of laser-modified samples were investigated by means of optical microscope, electron microscope, X-ray diffraction, surface roughness instrument, contact angle and cell cytotoxicity assay. After laser modification, the rough volcano-like recast layer with micro-/nanoporous structure and wave-like recast layer with nanoporous structure were generated on the surfaces of laser-modified samples, respectively. It was also found out that, an α → (α + rutile-TiO2) phase transition occurred on the recast layers of laser-modified samples. The Ti surface becomes hydrophilic at a high speed laser scanning. Moreover, the cell cytotoxicity assay demonstrated that laser-modified samples did not influence the cell adhesion and proliferation behaviors of osteoblast (MG-63) cell. The laser with 50 mm/s scanning speed induced formation of rough volcano-like recast layer accompanied with micro-/nanoporous structure, which can promote cell adhesion and proliferation of MG-63 cell on Ti surface. The results indicated that the laser treatment was a potential technology to enhance the biocompatibility for titanium.

Original languageEnglish
Article number7924
Pages (from-to)463-469
Number of pages7
JournalMaterials Characterization
Publication statusPublished - Jul 25 2015


  • Laser surface modification
  • Microstructure
  • Phase transformation
  • Porous structure

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)
  • Condensed Matter Physics


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