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Öğe The effect of austenitizing time on martensite morphologies and magnetic properties of martensite in Fe-24.5%Ni-4.5%Si alloy(Springer, 2007) Güngüneş, H.; Yaşar, E.; Durlu, T. N.The effect of austenitizing time on the formation of martensite in Fe-24.5%Ni-4.5%Si alloy has been studied by means of transmission electronmicroscope (TEM), scanning electronmicroscope (SEM) and Mossbauer spectroscopy technique. TEM and SEM observations revealed that the martensite morphology was found to be closely dependent on the austenitizing time. The orientation relationship between austenite and thermally induced martensite was found as the Kurdjumov-Sachs type. The volume fraction changes of martensite and austenite phases, the hyperfine magnetic field of martensite phase and isomery shift values have been determined by Mossbauer spectroscopy. The Mossbauer study also revealed that the martensite volume fractions increased with increasing austenite grain size.Öğe Effect of Mo on the magnetic properties of martensitic phase in Fe-Ni-Mo alloys(Elsevier Science Sa, 2006) Yaşar, E.; Güngüneş, H.; Kılıç, A.; Durlu, T. N.The paramagnetic-magnetically ordered transition and the effect of Mo content on the magnetic properties of martensite phase in Fe-30% Ni-x% Mo alloys have been investigated by AC susceptibility and Mossbauer spectroscopy. The results show that martensitic transformation temperature (M(S)) indicates the magnetic transition from paramagnetic to magnetically ordered state. Hyperfine magnetic field, isomery shift and volume fractions of phases were determined by Mossbauer spectroscopy. It is also found that volume fraction of thermally induced martensite and M(S) temperature decreased with the increasing Mo content. (c) 2006 Elsevier B.V. All rights reserved.Öğe Influence of surface preparation in resin/enamel interface: A SEM study(Int Amer Assoc Dental Researchi A D R/A A D R, 2002) Sengun, A.; İpekdal, I.; Özer, F.; Yaşar, E.…Öğe Martensitic transformation and magnetic properties of Fe-24.5%Ni-4.5%Si alloy(Maney Publishing, 2007) Güngüneş, H.; Yaşar, E.; Kilic, A.; Durlu, T. N.The effect of austenitising temperature and cooling rate on the morphology and magnetic properties of martensite in Fe-24-5%Ni-4-5%Si alloy has been studied by means of scanning electron microscopy, Mbssbauer spectroscopy and AC susceptibility. Martensite morphology was found to be closely dependent on the austenitising temperature and cooling rate. The changes in volume fraction of martensite and austenite phases, the internal magnetic field of martensite phase and the isomery shift values have been determined by Mbssbauer spectroscopy. The Mbssbauer study revealed that the martensite volume fractions increased with increasing austenitising temperature and cooling rate. Also internal magnetic field of martensite was decreased by increasing the martensite volume fractions. AC magnetic susceptibility measurements showed that the Neel temperatures T-N and the magnetic susceptibility X increase with increasing austenitising temperatures.Öğe Some aspects of thermally induced martensite in Fe-30% Ni-5% Cu alloy(Elsevier Science Bv, 2007) Güner, M.; Güler, E.; Yaşar, E.; Aktaş, H.Kinetical, morphological, crystallographical and several thermal properties of thermally induced martensite in the austenite phase of Fe-30% Ni-5% Cu alloy were investigated. Scanning electron microscope (SEM), transmission electron microscope (TEM) and differential scanning calorimetry (DSC) techniques were used during study. Kinetics of the transformation was found to be as athermal type. SEM and TEM observations revealed alpha' (BCC) martensite formation in the austenite phase of alloy by thermal effect. These thermally induced alpha' martensites exhibited a thin plate-like morphology with twinnings. (C) 2007 Elsevier B.V. All rights reserved.
