Akademik Məlumat İdarəetmə Sistemi
Turkish Journal of Physics, vol.25, no.6, pp.537-542, 2001 (Scopus, TRDizin)
We present results concerning the nitriding effects on phase transformations in Fe - 40 at. % Mn and Fe - 50 at. % Mn alloys. These alloys were studied by means of X-ray diffraction and Mössbauer-effect spectroscopy methods at room temperature. Results indicate that, after nitriding, in the absorption spectra of these alloys appears lines with hyperfine field H∼330 kOe which corresponds to the field on the 57Fe nuclei in the α-Fe. Annealing of the alloys at 650°C temperature (nitriding temperature) in argon atmosphere do not change the form of the Mössbauer absorption spectra. It appears that the nitriding process affect the microstructure of these alloys and leads to γ → α phase transformations in the Fe-Mn alloys. The distribution function of effective hyperfine magnetic field P(H) on the 57Fe nuclei in the Fe-40 at.% Mn alloy after hardening processes has one maximum with Heff ∼37 kOe, while nitriding processes leads to the appearance of two maxima with Heff ∼6 kOe and Heff ∼27 kOe in the P(H) curve of this alloy. Analogical results were obtained after nitriding processes for Fe-50 % Mn alloy.