- Turkish Journal of Physics
- Vol: 25 Issue: 2
- Mössbauer-Effect Study of Fine Atomic Structure of Fe-Ni-C Alloys
Mössbauer-Effect Study of Fine Atomic Structure of Fe-Ni-C Alloys
Authors : K. G. Binnatov
Pages : 121-127
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Publication Date : 9999-12-31
Article Type : Makaleler
Abstract :Fine atomic structure of Fe-Ni-C alloys containing of 30-36 wt. % Ni and 0.1-1.0 wt. % C have been analysed by means of a nuclear g -resonance method. The alloys under investigation were in austenite phase. The study shows that the effective hyperfine magnetic field Heff on the 57Fe nuclei is affected by the presence of C atoms in Fe-Ni alloys and the mean value of Heff fields increase with increasing of C element content in these alloys. It has been detected that increase in carbon content in Fe-Ni alloys leads to a broadening of Mössbauer absorption lines. On the base of analysis of the distribution function of effective hyperfine magnetic field P (H) on the 57Fe nuclei of Fe-Ni-C alloys, magnitudes of the most probable H eff fields have been calculated. The calculated magnitude of these fields for a number of heat treatments regime of Fe-33wt. % Ni-0.7wt. % C alloy are H eff = 320, 290, 260,240 and 220 kOe. The presence of these fields were attributed to the formation of the local configurations in the alloy for which Fe atoms have a different number of Ni and C nearest neighbour atoms in the first coordination sphere. Hyperfine magnetic fields Heff of 290 and 320 kOe corresponded to configurations of Fe atoms for which there is an increasing number of Ni atoms within nearest neighbour distances, and the number of C atoms within such configurations are very low. Other Heff fields could be associated with the configurations for which Fe atoms are surrounded mainly by C atoms. It is further found that the most active processes of atomic redistribution in Fe-Ni-C alloys are taking place within the temperature range 450-600oC.Keywords : Fe-Ni-C alloys, Fine atomic structure, Mössbauer-effect spectroscopy