R. Idczak

A study of defects in iron-based binary alloys by the Mössbauer and positron annihilation spectroscopies

The room temperature positron annihilation lifetime spectra and 57Fe Mossbauer spectra were measured for pure Fe as well as for iron-based Fe1−xRex, Fe1−xOsx, Fe1−xMox, and Fe1−xCrx solid solutions, where x is in the range between 0.01 and 0.05. The measurements were performed in order to check if the known from the literature, theoretical calculations on the interactions between vacancies and solute atoms in iron can be supported by the experimental data. The vacancies were created during formation and further mechanical processing of the iron systems under consideration so the spectra mentioned above were collected at least twice for each studied sample synthesized in an arc furnace— after cold rolling to the thickness of about 40 μm as well as after subsequent annealing at 1270 K for 2 h. It was found that only in Fe and the Fe-Cr system the isolated vacancies thermally generated at high temperatures are not observed at the room temperature and cold rolling of the materials leads to creation of another...