Yazar "Dikici, Mine" seçeneğine göre listele

Listeleniyor 1 - 2 / 2
  • Küçük Resim
    Öğe
    Characterization of martensite in Fe-25%Ni-15%Co-5%Mo alloy
    (Pergamon-Elsevier Science Ltd, 2009) Sarı, Uğur; Güler, E.; Kırındı, Talip; Dikici, Mine
    Kinetic, morphological, crystallographical, magnetic and thermal characteristics of thermally induced martensite in Fe-25%Ni-15%Co-5%Mo, alloy have been investigated by scanning electron microscope (SEM), transmission electron microscope (TEM), Mossbauer spectrometer, and differential scanning calorimeter (DSC). Kinetics of the transformation was found to be athermal. Also only lenticular martensite morphology was observed during microscope observations. in addition, martensite start temperature (M(s)) was determined as -63 degrees C from differential scanning calorimeter. On the other hand, Mossbauer spectra revealed a paramagnetic character for the austenite phase and a ferromagnetic character for thermally induced martensite phase. (C) 2009 Elsevier Ltd. All rights reserved.
  • Küçük Resim
    Öğe
    The effects of pre-strain, recovery temperature, and bending deformation on shape memory effect in an Fe-Mn-Si-Cr-Ni alloy
    (Elsevier Science Sa, 2009) Kirindi, Talip; Sarı, Uğur; Dikici, Mine
    In this study, effects of pre-strain, recovery temperature, and number of bending test cycles on the microstructure and shape memory behavior of Fe-12.5%Mn-5.5%Si-9%Cr-3.5%Ni alloy have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM). X-Ray diffract-ion method, and bending test. Experiments show that the shape memory effect of the alloy can be enhanced by convenient recovery temperature and pre-strain rate. The shape recovery ratio increases with increasing pre-strain and recovery temperature, while it decreases with an increase in the number of bending test cycles. The changes in the shape memory are attributed to the variation of amount of epsilon martensite and crystal defects. The amount of epsilon martensite increases with increasing the pre-stain ratio. Crystal defects decrease with an increase in the recovery temperature, while they increase with increasing the number of the bending test cycles. (C) 2008 Elsevier B.V. All rights reserved.