Alloying by high dose ion implantation of iron into magnesium and aluminium

Alloys of the systems Fe-Al (mixable over the whole concentration range) and Fe-Mg (insoluble with each other) were produced by implantation of Fe ions into Al and Mg, respectively. The implantation energy was 200 keV and the ion doses ranged from 1 x 1014 to 9 x 1017cm-2The obtained implantation profiles were determined by Auger electron spectroscopy depth profiling. Maximum iron concentrations reached were up to 60 at.% for implantation into Al and 94 at.% for implantation into Mg. Phase analysis of the implanted layers was performed by conversion electron Moessbauer spectroscopy and X-ray diffraction.For implantation into Mg, two different kinds of Moessbauer spectra were obtained: at low doses paramagnetic doublets indicating at least two different iron sites and at high doses a dominant ferromagnetic six-line-pattern with a small paramagnetic fraction. The X-ray diffraction pattern concluded that in the latter case a dilated αiron lattice is formed. For implantation into Al, the Moessbauer spectra were doublet structures very similar to those obtained at amorphous Fe-Al alloys produced by rapid quenching methods. They also indicated at least two different main iron environments. For the highest implanted sample a ferromagnetic six-line-pattern with magnetic field values close to those of Fe3Al appeared