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Öğe Characterization of Ni-Ti Alloy Powders for Use in Additive Manufacturing(Pleiades Publishing Inc, 2018) Altug-Peduk, Gozde S.; Dilibal, Savas; Harrysson, Ola; Ozbek, Sunullah; West, HarveyAdditive manufacturing (AM) offers a fully integrated fabrication solution within many engineering applications. Particularly, it provides attractive processing alternatives for nickel-titanium (Ni-Ti) alloys to overcome traditional manufacturing challenges through layer by layer approach. Among powder-based additive manufacturing processes, the laser beam melting (LBM) and the electron beam melting (EBM) are two promising manufacturing methods for Ni-Ti shape memory alloys. In these methods, the physical characteristics of the powder used as raw material in the process have a significant effect on the powder transformation, deposition, and powder-beam interaction. Thus, the final manufactured material properties are highly affected by the properties of the powder particles. In this study, the Ni - Ti powder characteristics are investigated in terms of particle size, density, distribution and chemical properties using EDS, OM, and SEM analyses in order to determine their compatibility in the EBM process. The solidification microstructure, and after built microstructure are also examined for the gas atomized Ni-Ti powders.Öğe Experimental Investigation on the EBM-Based Additively Manufactured Prismatic Nickel-Titanium SMA Components(Pleiades Publishing Inc, 2021) Altug-Peduk, Gozde S.; Dilibal, Savas; Harrysson, Ola; Ozbek, SunullahAdditive manufacturing (AM) of the nickel-titanium (NiTi) shape memory alloys (SMA) have provided novel component solutions with a variety of design configurations in the industry. Electron beam melting (EBM) is a trending metal additive manufacturing process for industrial applications in the field of biomedical and aerospace engineering. In this study, experimental investigations were conducted to reveal the effect of processing conditions on the microstructure and hardness properties of EBM-fabricated nickel-titanium components. Furthermore, detailed microstructural characterizations were performed with a scanning electron microscope, EDS, and XRD for unveiling of the microscopic structure and phase analysis during the layer by layer solidification. The experimental results were systematically evaluated for the powder and the bulk prismatic components, respectively.Öğe An extensive study on the synthesis of iron based magnetic aluminium oxide nanocomposites by solution combustion method(Elsevier, 2019) Pehlivan, Merve; Simsek, Sinem; Ozbek, Sunullah; Ozbek, BelmaIn the present study, it was aimed to investigate the synthesis of iron based magnetic aluminium oxide nanocomposites (IMANCs) by solution combustion (SC) method using various fuel types at various amounts. IMANCs were synthesized using aluminium nitrate and iron nitrate as oxidizers. Urea, glycine and sucrose were chosen as fuel types at various amounts, respectively, to examine their effects on size and morphology of nanocomposites synthesized. The chemical compositions, morphologies and thermal behaviors of IMANCs synthesized were compared with data obtained from characterization studies using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDS), Thermogravimetric and Differential Thermal Analysis (TG/DTA), Fourier Transform Infrared Analysis (FT-IR), Surface Area and Porosity Analyzer. The characterization studies revealed that IMANCs were synthesized successfully by SC method with nanoscale properties. It was found that IMANCs synthesized using stoichiometric amount of glycine had porous and smaller particle size with higher surface area compared to other samples synthesized by urea and sucrose, respectively. There is no documentation found on glycine based synthesis of IMANCs by SC method in the literature so far. Additionally, this original paper is the first report on the synthesis of IMANCs by applying calcination and reduction processes following SC reaction using various fuel types at various amounts. It was resulted that the samples synthesized by SC method had smaller particle sizes compared to the samples which were synthesized by applying calcination and reduction processes following SC reaction using stoichiometric amount of urea, glycine and sucrose as fuel types, respectively. (C) 2019 Brazilian Metallurgical, Materials and Mining Association. Published by Elsevier Editora Ltda.