Surface modifications on Fe-40 at.-%AI intermetallic alloy by excimer laser melting treatment

S. Frangini, F. Pierdominici, J. Lascovich, S. Tosto, P. Di Lazzaro

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Abstract

A target of Fe 40 at.-% Al intermetallic alloy with ordered B2 structure was subjected to lauer melting processing by a high energy XeCI excimer pulse (wavelength 308 wn. pulse length 120 ns) in low pressure air. The total thickness of the laser affected :one (LAZ) was ∼ 150 nm. The modified surface showed an increased roughness and the presence of cracking. The X-ray photoelectron spectroscopy (XPS) measurements revealed a strong enrichment in the aluminium concentration within the LAZ, as well as relatively high contents of oxygen and nitrogen incorporated in the near surface region. Both angle resolved and depth profile XPS analyses suggested that oxides, nitrides, and oxynitrides were mainly present within the LAZ as discrete particles in the metallic matrix rather than as surface layers. Significant surface hardness reduction was observed after laser treatment, which has been interpreted to he due to partial suppression of 32 lattice ordering. Electrochemical measurements in borate buffer solution showed a reduced anodic activity of the laser processed aluminide in the potential range between the open circuit potential and 0.1 V saturated calomel electrode, whereas at higher anodic overpotentials no substantial differences in behaviour were observed with respect to the untreated Fe-40Al surfaces. Such consequences of the excimer laser treatment may be explained by mechanisms involving aluminium enrichment and nitride formation processes inside the LAZ. © 1997 The Institute of Materials.
Original languageEnglish
Pages (from-to)526 - 532
Number of pages7
JournalMaterials Science and Technology
Volume13
Issue number6
DOIs
Publication statusPublished - 1997

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All Science Journal Classification (ASJC) codes

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

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