A Study of Point Defects in the B2-Phase Region of the Fe-Al System by Mössbauer Spectroscopy

Abstract:

In this work, Mössbauer spectroscopy and X-ray powder diffraction (XRD) are used in a study of point defect formation in intermetallic phases of the B2 structure of the Fe-Al system as a function of Al concentration. The results are compared with the concentrations of point defect determined from positron annihilation data. In the Mössbauer effect, two types of samples are investigated: Fe-Al alloys with few additives obtained by induction melting and Al-rich metallic powders produced by the self-decomposition method and intensive grinding of high energy in the electro-magneto-mechanical mill. The work presents the values of the 57Fe isomer shift and quadruple splitting for the components describing the point defect in the local environment of a Mössbauer nuclide. The concentration of the Fe vacancies and Fe atoms substituting Al (Fe-AS) are determined. The results show that an increase in Al content causes an increase in vacancy and Fe-AS concentration.

• Periodical: Materials Science Forum (Volumes 636-637)
• Pages: 651-656
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.636-637.651
• Online since: January 2010
• Authors: Aneta Hanc, Jerzy Kansy
• Keywords: Iron Aluminide, Mössbauer Spectroscopy CEMS, Point Defect

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