Internal oxidation process in diluted Fe-Cr alloys: a transmission Moessbauer spectroscopy study

摘要

The room-temperature study of Fe_(0.97)Cr_(0.03) and Fe_(0.94)Cr_(0.06) alloys was performed using the transmission Mossbauer spectroscopy (TMS). The TMS measurements allow to determine changes in chemical composition and content of iron oxides in the bulk of the studied samples during exposure to air at 570,870 and 1070 K. The results indicate that the chemical composition of samples changes significantly, and it is strongly dependent on temperature at which the studied samples are exposed to air. The iron internal oxidation kinetics as well as the activation energies for the oxidation of iron atoms in studied alloys were calculated.