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    Effects of homogenization time on the both martensitic transformations and mechanical properties of Fe-Mn-Si-Cr-Ni shape memory alloy
    (Elsevier Science Sa, 2007) Kirindi, T.; Güler, E.; Dikici, A.
    In this work, we have investigated some physical and mechanical properties of martensitic transformation in Fe-12.5%Mn-5.5%Si-9%Cr-3.5%Ni (wt) shape memory alloy. Compressive deformation at room temperature, which applied to epsilon(hcp) phase within austenite phase cause the formation of alpha'(bcc) martensite crystals at intersection of prior e martensite plates and also new formed 8 martensite plates were observed. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction methods were applied for revealing microstructural and crystallographic features of martensitic transformations in this alloy. Also effect of prior homogenization time on the martensitic transformations and their mechanical features were stress-strain curves. (c) 2006 Elsevier B.V. All rights reserved.
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    Microstructural analysis of thermally induced and deformation induced martensitic transformations in Fe-12.5 wt.% Mn-5.5 wt.% Si-9 wt.% Cr-3.5 wt.% Ni alloy
    (Elsevier Science Sa, 2006) Kirindi, T.; Dikici, A.
    Martensitic transformations induced by thermally and compression deformation at room temperature in Fe-12.5 wt.% Mn-5.5 wt.% Si-9 wt.% Cr-3.5 wt.% Ni alloy were studied in detail by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). From microstructural observations, it was seen that heat treated samples exhibited regular overlapping of stacking faults and epsilon martensite plates were formed parallel to each other. Also, TEM investigations showed that the orientation relationship between gamma (fcc) and epsilon (hcp) phases corresponds to Shoji-Nishiyama type. With applied low plastic deformation rate, only 8 martensite occurred in austenite grain. As a consequence, 4 and 25% plastic deformation at room temperature caused e martensite formation in austenite phase and the new epsilon (hcp) and alpha' (bcc) martensite formation in martensite phases, respectively. Orientation relationship between epsilon and alpha' phases was found by the electron diffraction analysis. (c) 2005 Elsevier B.V. All rights reserved.