Study of the surface layer formed by the laser processing of Ti-6Al-4V alloy in a dilute nitrogen environment

M.S. Selamat, T.N. Baker, L.M. Watson

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Optical microscopy, scanning electron microscopy (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and a hardness tester were used to understand the microstructure and to characterise the phases formed in a Ti-6Al-4V alloy at different tracks and depths, produced by laser nitriding under a dilute nitrogen environment with a spinning beam. The results show that the solidified melt consists of α′-Ti and TiNx. Using XRD, x was determined to be 0.75 while from XPS, x lay in a range of 0.5-0.8. The melt zone showed a range of hardness of between 500 and 800 HV.
Original languageEnglish
Pages (from-to)509-515
Number of pages6
JournalJournal of Materials Processing Technology
Issue number1-3
Publication statusPublished - Jun 2001


  • laser
  • nitride
  • titanium alloy

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