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  • Küçük Resim
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    Effect of Si on austenite stabilization, martensite morphology, and magnetic properties in Fe-26%Ni-x%Si alloys
    (Springer, 2011) Gungunes, H.; Yasar, E.; Dikici, M.
    The effect of Si on the austenite stabilization, martensite morphology, and magnetic properties in Fe-26%Ni-x%Si (x=3.5, 5, and 6) alloys have been studied by means of transmission electron microscopy (TEM) and Mossbauer spectroscopy techniques. TEM observations reveal that the martensite morphology is closely dependent on the Si content. The volume fraction changes of martensite and austenite phases, the hyperfine magnetic field, and isomer shift values have been determined by Mossbauer spectroscopy. The Mossbauer study reveals that the hyperfine magnetic field, the isomer shift values and the volume fraction of martensite decrease with increasing Si content.
  • Küçük Resim
    Öğe
    Effects of aging on the microstructure of a Cu-Al-Ni-Mn shape memory alloy
    (Springer, 2011) Sari, U.; Kirindi, T.; Ozcan, F.; Dikici, M.
    The influence of aging on the microstructure and mechanical properties of Cu-11.6wt%Al-3.9wt%Ni-2.5wt%Mn shape memory alloy (SMA) was studied by means of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffractometer, and differential scanning calorimeter (DSC). Experimental results show that bainite, gamma(2), and alpha phase precipitates occur with the aging effect in the alloy. After aging at 300dgC, the bainitic precipitates appear at the early stages of aging, while the precipitates of gamma(2) phase are observed for a longer aging time. When the aging temperature increases, the bainite gradually evolves into gamma(2) phase and equilibrium alpha phase (bcc) precipitates from the remaining parent phase. Thus, the bainite, gamma(2), and alpha phases appear, while the martensite phase disappears progressively in the alloy. The bainitic precipitates decrease the reverse transformation temperature while the gamma(2) phase precipitates increase these temperatures with a decrease of solute content in the retained parent phase. On the other hand, these precipitations cause an increasing in hardness of the alloy.