In this thesis, the structural and magnetic properties of Fe100-xPdx (x=26, 27, 28, 29, 30, 31, 32) ferromagnetic shape memory alloys are investigated. These ferromagnetic shape memory alloys are produced by vacuum arc melting method. Alloys are annealed 8 hours at 950 oC and 1100 oC and cooled down to room temperature in furnace. The crystal structures of alloys are analyzed with X-ray diffractometer (XRD). The martensitic transformation from fcc high temperature phase to fct martensite phase is found. (200) αFe phase is appeared in annealed alloys as a result of decomposition. High resolution images of the alloys are taken by Scanning Electron Microscope (SEM) and surface analysis are done. Martensitic twin variants are seen in alloys annealed at 1100 oC. In addition, ultimate analysis is done by SEM-EDX (Energy Dispersive X-Ray Spectroscopy) and the concentrations are compatible with production concentrations. The magnetic properties of the alloys are determined by PPMS. M(H) curves are analyzed. The magnetic field between -60 kOe and 60 kOe is applied. The magnetization analysis depending on magnetic field are showed that the alloys are ferromagnetic. Saturation magnetization and coercivity force is compatible with literature. The increase in annealing temperature causes decrease in saturation magnetization Keywords: Ferromagnetic shape memory alloys, FePd alloy, XRD, SEM, PPMS.
Tez (Doktora) - Süleyman Demirel Üniversitesi, Fen Bilimleri Enstitüsü, Fizik Anabilim Dalı, 2016.
Kaynakça var.
In this thesis, the structural and magnetic properties of Fe100-xPdx (x=26, 27, 28, 29, 30, 31, 32) ferromagnetic shape memory alloys are investigated. These ferromagnetic shape memory alloys are produced by vacuum arc melting method. Alloys are annealed 8 hours at 950 oC and 1100 oC and cooled down to room temperature in furnace. The crystal structures of alloys are analyzed with X-ray diffractometer (XRD). The martensitic transformation from fcc high temperature phase to fct martensite phase is found. (200) αFe phase is appeared in annealed alloys as a result of decomposition. High resolution images of the alloys are taken by Scanning Electron Microscope (SEM) and surface analysis are done. Martensitic twin variants are seen in alloys annealed at 1100 oC. In addition, ultimate analysis is done by SEM-EDX (Energy Dispersive X-Ray Spectroscopy) and the concentrations are compatible with production concentrations. The magnetic properties of the alloys are determined by PPMS. M(H) curves are analyzed. The magnetic field between -60 kOe and 60 kOe is applied. The magnetization analysis depending on magnetic field are showed that the alloys are ferromagnetic. Saturation magnetization and coercivity force is compatible with literature. The increase in annealing temperature causes decrease in saturation magnetization Keywords: Ferromagnetic shape memory alloys, FePd alloy, XRD, SEM, PPMS.