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Characterization of a laser‐nitrided titanium alloy by electron backscattered diffraction and electron probe microanalysis
Author(s) -
Gordin D. M.,
Gloriant T.,
Bohn M.,
Guillou A.,
Thibon I.,
Ansel D.
Publication year - 2005
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.2128
Subject(s) - electron microprobe , nitriding , electron backscatter diffraction , tin , microanalysis , scanning electron microscope , analytical chemistry (journal) , alloy , microstructure , electron diffraction , materials science , titanium , titanium alloy , crystallography , chemistry , metallurgy , diffraction , layer (electronics) , optics , nanotechnology , composite material , physics , organic chemistry , chromatography
After a laser gas nitriding treatment of the Ti‐7.5Al (atom %) titanium‐based alloy, we used a combination of electron backscattered diffraction (EBSD) in scanning electron microscope and electron probe microanalysis (EPMA) techniques in order to efficiently characterize the different phases in the resolidified layer. Representative measurements of chemical composition and reliable determination of crystal structure were possible for each phase of the complex microstructure. The reaction zone is formed by a mixture of isostructural TiN phases with dendritic and/or ‘coarse’ needles morphology, fixed into a α′‐Ti matrix (martensite) with a thin needle aspect. The nitrogen solubility was found to remain very low in the α′‐Ti matrix (up to 2–3 atom %), while in the TiN phase, an aluminum solubility as high as 4 atom % was measured, reducing drastically the nitrogen content into a Ti 79 N 17 Al 4 chemical composition. Copyright © 2005 John Wiley & Sons, Ltd.