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Patrik Novák, Aleksandr Gokhman, Edmund Dobročka, Jozef Bokor and Stanislav Pecko

Abstract

X-ray diffraction (XRD) and positron annihilation spectroscopy (PAS) have been used for the characterization of the two binary alloys Fe-Cr with Cr content 2.36 and 8.39 wt%. The influence of ion implantation on these alloys was studied. Different implantation doses of helium, up to 0.5 C/cm2, were used to simulate neutron-induced damage in a sub-surface region. To characterize the damage, a lattice parameter, coherent domain size, residual stress and a crystallographic texture have been studied by grazing incidence X-ray diffraction (GIXRD). It was found out that these parameters showed a similar dependence on the implantation dose as the positron lifetime determined by positron annihilation spectroscopy.

Open access

Jozef Sitek, Dominika Holková, Július Dekan, Milan Pavúk and Patrik Novák

Abstract

Amorphous precursors of A: (Fe64Co21B15)95P4Cu1 and B: (Fe64Co21B15)96P4 alloys were used. Nanocrystalline structure was created by heat treatment. Samples were studied by Mössbauer spectroscopy, XRD and AFM. Cu ions of dose 1016 at/cm2 were implanted into the amorphous B. According to simulated program we estimated that Cu ions created surface layer with a thickness of a few micrometres. Changes in bulk structure were not observed at parameters of Mössbauer spectra after implantation. After heat treatment the implanted sample was nearly identical with the nanocrystalline sample of A. Implantation had an influence on the volumetric fraction of the constituent phases and on their magnetic microstructure. Implantation of Cu ions in amorphous precursor containing Cu as A caused after heat treatment in nanocrystalline state increasing of nanocrystalline component. This technology of preparation of nanocrystalline alloys indicate that implantation of ions into an amorphous precursor has an influence on the final structure and properties of nanocrystalline alloy.