Electron Microscopic Study of Interdiffusion in Equiatomic Fe-Ni Composite

V.V. Bogdanova, R.V. Vovka, S.V. Dukarova, M.V. Kislitsaa, S.I. Petrushenkoa, V.N. Sukhova, G.Ya. Khadzhaia, Y.L. Goulatisa, S.R. Vovkb, c, E.S. Gevorkyanb, A. Feherc, P. Kollarc, J. Fuzerc, J.N. Latosińskad aV.N. Karazin Kharkiv National University, 4 Svobody Sq., Kharkiv 61022, Ukraine bUkrainian State University of Railway Transport, 7 Feierbakh Sq., Kharkiv 61050, Ukraine cCentre of Low Temperature Physics, Faculty of Science, P.J. Safarik University, Park Angelinum 9, 041 54 Kosice, Slovakia dAdam Mickiewicz University, Uniwersytetu Poznańskiego 2, 61-614 Poznań, Poland

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The paper presents a study of interdiffusion processes in a binary Fe-Ni system (obtained by electroconsolidation of nickel and iron powders) by X-ray energy dispersive spectroscopy. Well-separated regions of almost pure iron and nickel have been discovered. The content of nickel, estimated from the concentration dependence of the interdiffusion coefficient, which determines the kinetics of the homogenization process of the electroconsolidated Fe-Ni composite sample, was ~70 at.%. The value of the interdiffusion coefficient of the electroconsolidated Fe-Ni composite is significantly higher than that of the alloy of similar composition which probably results from the effect of spark plasma sintering technology (pressure and current along the same direction during consolidation) but also from a significant contribution of diffusion with mass transfer along the particle boundaries in the composite.

DOI:10.12693/APhysPolA.139.62 topics: Fe-Ni binary system, electron microscopy, interdiffusion processes, spark plasma sintering technology and mass transfer effect