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Öğe Effects of thermal and deformation on martensitic transformation and magnetic properties in Fe-17%Mn-4.5%X (X = Co and Mo) alloys(Pergamon-Elsevier Science Ltd, 2017) Armagan, Osman; Sari, Ugur; Yucel, Cagri; Kirindi, TalipIn this study, the Co and Mo addition to Fe-Mn based alloys was investigated to observe its effect on martensitic phase transformation. Two types of martensite structure occurred from the surface observations made by SEM for Co-added and Mo-added alloys morphologically in austenite grain. With the help of TEM studies, it was understood that these martensite structures are epsilon (h.c.p.) and alpha' (b.c.c.). TEM investigations showed that the orientation relationship between gamma (f.c.c.) and epsilon phases corresponds to Shoji-Nishiyama type and between gamma and alpha' phases corresponds to Kurdjumov-Sachs (K-S) type. In the SEM observations, the amount of these two types of martensite structure has been varied depending on the amount of deformation and the heat treatment temperature. In addition, Co and Mo effects were revealed in microstructure analyzes. By comparing the values of the lattice parameters obtained from the TEM and X-Ray observations with the values of those in the literature, it is shown how Co and Mo affect the lattice parameters of structure. The lattice parameter in Co-added alloy is a(alpha') = 2.8695 A degrees while Mo-added alloy is calculated as a(alpha') = 2.8567 A degrees. The type of martensitic transformation and the change of magnetic properties of alloys related to transformation rate were demonstrated by the analysis of the Mossbauer Spectrometer data. In particular, the change in the amount of alpha' martensite changes the antiferromagnetism or ferromagnetism and the internal magnetic field values of the alloys.Öğe Investigation of deformation and microstructure of bainite in Cu-9.97%Al-4.62%mn alloy(Technical Faculty, Bor-Serbia, 2014) Aldirmaz, E.; Aksoy, I.In this study, some physical and mechanical properties in Cu-9.97%Al-4.62%Mn (wt%) alloy were investigated by X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and compression deformation test. Bainite phase were obtained in the samples according to SEM and XRD analyses. Compression stress was applied on the alloy in order to investigate the deformation effect on the bainite phase transformation. On the surface of the Cu-9.97%Al-4.62%Mn alloy after the deformation, both bainite and martensite variants formed.Öğe Aspects of thermal martensite in a FeNiMnCo alloy(Pergamon-Elsevier Science Ltd, 2010) Güler, Melek; Güler, Emre; Kahveci, NuriThermal martensite characteristics in Fe-29%Ni-2%Mn-2%Co alloy were investigated with scanning electron microscopy (SEM) and Mossbauer spectroscopy characterization techniques. SEM observations obviously revealed the lath martensite morphology in the prior austenite phase of examined alloy. As well, the martensitic transformation kinetics was found to be as athermal type. On the other hand, Mossbauer spectroscopy offered the paramagnetic austenite phase and ferromagnetic martensite phase with their volume fractions. Also, the internal magnetic field of the martensite was measured as 32.9 T from the Mossbauer spectrometer. (C) 2010 Elsevier Ltd. All rights reserved.Öğe Poly[[diaquacaesium(II)]bis(μ3-3-carboxypyrazine-2-carboxylato)]. Corrigendum(Blackwell Publishing, 2008) Tombul, Mustafa; Guven, Kutalmis; Buyukgungor, Orhan…Öğe The magnetic properties of martensitic phase in Fe-Ni-Mn alloys: AC magnetic susceptibility observations(Springer, 2005) Aktürk, Selçuk; Durlu, Tahsin Nuri…Öğe The magnetic properties of martensitic phase in Fe-Ni-Mn alloys: Mossbauer spectroscopy observation(Springer, 2005) Aktürk, S.; Durlu, Tahsin Nuri…Öğe Crystal structure of a-phenyl-N-thioacetylmorpholine(Japan Society for Analytical Chemistry, 2004) Çelik, I.; Akkurt, M.; Demirtaş, I.; Erenler, R.; Güven, K.The title compound, C12H15NOS, consists of a thioamid and an ?-substituted phenyl group. It crystallizes in the monoclinic space group P21/c. The unit-cell parameters at 293 K are a = 6.553(5), b = 23.362(5), c = 8.201(5)Å, ? = 112.532(5)°, V = 1159.7(12)Å3, Dx = 1.268 g/cm3, Z = 4. The morpholine group takes a chair conformation. 2004 © The Japan Society for Analytical Chemistry.Öğe Structure of 1-(4-methylphenylamino)-2-phenyl-1,2-ethandione-1-oxime(Japan Society for Analytical Chemistry, 2003) Sarı Uğur; Bati Hümeyra; Güven Kutalmış; Taş Murat; Aksoy İlhanThe crystal structure of 1-(4-methylphenylamino)-2-phenyl-1,2-ethandione-1-oxime (C15H14N2O2) has been determined by X-ray analysis. It crystallizes in the orthorhombic space group Pna21, with unit cell parameters: a = 23.516(3), b = 5.364(3), c = 21.872(3)Å, V = 2758.7(17)Å3, Dc = 1.224 g/cm3, and Z = 8. The crystal structure was solved by direct methods and refined by full-matrix least squares to a final R-value of 0.041 for 2204 observed reflections. There are two independent molecules, A and B. These molecules are linked by intermolecular O-H···N hydrogen bonds. 2003 © The Japan Society for Analytical Chemistry.Öğe Structural role of tin in tin-silicates(2001) Yıldırım, Erdem Kamil; Bent, Julian; Holland, Diane; Dupree, RayKalay, float glasses denilen ince tabakalar halinde float tekniği ile üretilen camların ve bu camların yüzey kaplamalarında kullanılan ana elementdir. Bu yüzden kalayın kalay-silisyum yapılarındaki etkinlğinin anlaşılması oldukça önemlidir. Bununla birlikte SnO-SiO2 camlarının üretilmesindeki güçlüklerden dolayı bu tür malzemeler üzerindeki çalışmalar çok fazla ilgi çekmemiştir. Bu çalışmada kalay içerikleri %39, %42, ve %54 mol olan kalay-silisyum camlar ve bir kısmı kristalleşmiş kalay-silisyum , {17}O MAS NMR tekniği kullanılarak incelenmiştir. Bu deneylerden elde edilen sonuçlara göre koordinasyon numarası üç olan oksijenlerin varlığına doğrudan kanıt bulunamamıştır. Oysa Bent [1] bu tür malzemelerde koordinasyon numarası üç olan kalaydan söz etmektedirki bu koordinasyon numarası üç olan oksijenin varlığını gerektirir. Bunun yanında deney sonuçları gösteriyorki malzeme içerisindeki SnO konsantrasyonu arttırıldıkça Si-O-Si bağları parçalanarak Si-O-Sn ve Sn-O-Sn bağları oluşmaktadır.
