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  • Küçük Resim Yok
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    Effect of austenitization heat treatment on the magnetic properties of Fe-40wt% Ni-2wt% Mn alloy
    (JOURNAL OF UNIV OF SCIENCE AND TECHNOLOGY BEIJING, 2007) Buyukakkas, S.; Aktas, H.; Akturk, S.
    The effect of austenitization heat treatment on magnetic properties was examined by means of Mossbauer spectroscopy on an Fe-40wt%Ni-2wt%Mn alloy. The morphology of the alloy was obtained by using scanning electron microscopy (SEM) under different heat treatment conditions. The magnetic behavior of the non heat-treated alloy is ferromagnetic. A mixed magnetic structure including both paramagnetic and ferromagnetic states was obtained at 800 degrees C after 6 and 12 It heat treatments. In addition, the magnetic structure of the heat-treated alloy at 1150 degrees C for 12 It was ferromagnetic. With the volume fraction changing, the effective hyperfine field of the ferromagnetic austenite phase and isomery shift values were also determined by Mossbauer spectroscopy.
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    Effect of plastic deformation on magnetic properties of Fe-40%Ni-2%Mn austenitic alloy
    (JOURNAL IRON STEEL RESEARCH EDITORIAL BOARD, 2007) Bueyuekakkas, Selva; Aktas, H.; Akturk, S.
    The effects of plastic deformation on the magnetic properties of austenite structure in an Fe-40%Ni-2%Mn alloy is investigated by using Mossbauer spectroscopy and Differential Scanning Calorimetry (DSC) techniques The morphology of the alloy has been obtained by using Scanning Electron Microscopy (SEM). The magnetic behaviour of austenite state is ferromagnetic. After plastic deformation, a mixed magnetic structure including both paramagnetic and ferromagnetic states has been obtained at the room temperature. The volume fraction changes, the effective hyperfine fields of the ferromagnetic austenite phase and isomery shift values have also been determined by Mossbauer spectroscopy. The Curie point (Tc) and the Neel temperature (T-N) have been investigated by means of DSC system for non-deformed and deformed Fe-Ni-Mn alloy. The plastic deformation of the alloy reduces the T-N and enhances the paramagnetic character of austenitic Fe-Ni-Mn alloy.