Alloying effect on K-shell fluorescence parameters of porous NiTi shape memory alloys

• Published in: Journal of electron spectroscopy and related phenomena 2014-01, Vol.192, p.55-60
• Main Authors: Cengiz, E., Ozkendir, O.M., Kaya, M., Tirasoglu, E., Karahan, I.H., Kimura, S., Hajiri, T.
• Format: Article
• Language: English
• Subjects: Alloying effect; Alloying effects; Fluorescence; Intensity ratio; Intermetallic compounds; Intermetallics; Nickel base alloys; Nickel titanides; Porous NiTi alloy; Production cross-section; Shape memory alloys; Shells; X-rays
• ISSN: 0368-2048; 1873-2526
• DOI: 10.1016/j.elspec.2014.01.002

•The Kα,β shell production cross-sections and Kβ/Kα intensity ratios of porous NiTi SMAs were determined by ED-XRF.•To analyze the changes in the structures due to the preheating and solution heat treatment processes, XRD and XPS measurements were also performed.•The deviations between the experimental and theoretical were interpreted to charge transfer phenomena. The Kα,β shell production cross-sections and Kβ/Kα intensity ratios of porous Ni −49at% Ti shape memory alloys were determined using energy dispersive X-ray fluorescence (EDXRF) technique. Also, the alloying effect on the K shell fluorescence parameters was investigated. The samples were excited by 59.5keV γ-rays from an 241Am annular radioactive source. The K X-rays emitted by the samples were counted by an Ultra-LEGe detector with a resolution of 150eV at 5.9keV. The structure analyses of the samples were also made using X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The deviations between the present results and theoretical values, calculated for pure Ti and Ni, were attributed to charge transfer phenomena and/or rearrangement of valance shell electrons and porosity.