Thermal stability of ion-beam mixed and laser-irradiated FeNiCr multilayers

Allesandro Perin, Ratnesh Gupta, Giovanni Principi, Cristiana Tosello, Luigi Maria Gratton, Erno Kuzmann, Zoltan Klencsar

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A multilayer film having Fe50Ni25Cr25 overall composition has been deposited by e-gun and submitted to two non-equilibrium treatments: ion-beam mixing with 100 keV xenon ions to a dose of 2 × 1016 ions cm-2, and pulsed laser irradiation with a beam of 1.1 J cm-2 (FWHM = 8 ns and λ=694 nm). The iron layers consisted of the 57Fe isotope, in order to perform a good structural characterisation by means of Mössbauer spectroscopy. Additional structural information was achieved by glancing angle X-ray diffraction analysis. It is found that both treatments give rise to a complete mixing of the layers and that a disordered solid state solution is formed. Structurally, the solid solution obtained is mainly bcc after ion irradiation and is a bcc/fcc mixture after laser irradiation. The metastability of these structures has been studied by heat treatments in vacuum at 450, 640 and 800 °C. Heating at 450 °C induces a solid-state diffusion among the parent elements, which reduces the co-ordination of iron atoms with the alloying elements, as observed in other metastable FeNiCr film or bulk alloys. At higher temperatures a bcc to fcc phase transformation gradually takes place until, at 800 °C, the samples display the thermodynamically stable fcc structure. The thermal evolution of the irradiation multilayers has been compared with that of unirradiated ones.

Original languageEnglish
Pages (from-to)93-97
Number of pages5
JournalSurface and Coatings Technology
Volume103-104
DOIs
Publication statusPublished - May 1998

Keywords

  • Fe-Ni-Cr alloy
  • Ion beam mixing
  • Laser beam mixing
  • Metastable phases
  • Multilayers

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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