Yazar "Ozmetin, A. E." seçeneğine göre listele

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    Fabrication and mechanical characterization of rare earth permanent magnet SmCo5 films
    (Elsevier Science Sa, 2017) Kuru, M.; Sahin, O.; Ozarslan, S.; Ozmetin, A. E.
    This study reports mechanical properties of rare earth permanent magnet (REPM) SmCo5 thin films fabricated by RF magnetron sputtering technique. 1 mu m thick SmCo5 thin films were grown on Si (100) substrate at room temperature, and later they were annealed at 400 degrees C. Great care has been taken to decrease O-2 in the chamber throughout deposition. Mechanical and Structural properties of SmCo5 thin films were researched using the nanoindentation and in situ scanning probe microscopy (SPM), Grazing Incident X-ray Diffraction (GIXRD) and Scanning Electron Microscopy (SEM) techniques. Nanoindentation-induced plasticity of SmCo5 thin film was characterized by in situ SPM imaging of indented cross-sections. Nanoindentation results show load-displacement curves are continuous and smooth that there is no pile-up and sink-in behavior. Furthermore, both elastic modulus and nano hardness values of REPM SmCo5 exhibit peak load dependence. Nanohardness increases with increasing indentation test load, while the reduced modulus decrease with increasing indentation test load. The obtained values of the intrinsic nanohardness and intrinsic reduced modulus are 3.47 +/- 0.07 GPa and 43.09 +/- 1.60 GPa, respectively. (C) 2016 Elsevier B.V. All rights reserved.
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    Mechanical characterization of MgB2 thin films using nanoindentation technique
    (Elsevier Science Sa, 2015) Ozmetin, A. E.; Sahin, O.; Ongun, E.; Kuru, M.
    Mechanical properties of MgB2 thin films deposited by RF magnetron sputtering technique have been studied. MgB2 thin films were deposited approximately 300 nm on Si substrate above room temperature, and the thin films were subsequently annealed. Great care has been taken to reduce O-2 in the chamber during deposition. Structural and mechanical properties of MgB2 thin films were investigated using the Scanning Electron Microscopy (SEM), X-ray diffraction (XRD) and nanoindentation techniques. Unloading segments of nanoindentation curves analyzed using Oliver-Pharr method. Both reduced elastic modulus and nanohardness values show load dependence, i.e., indentation size effect (ISE). Proportional specimen resistance (PSR) model was used to calculate the load independent nanohardness value. Load-independent hardness value was calculated using the proportional specimen resistance (PSR) model. XRD and SEM results show that the MgB2 thin films have fine grain size. Nanoindentation results show that hardness and elastic modulus values were 11.72 GPa and 178.13 GPa, respectively. (C) 2014 Elsevier B.V. All rights reserved.
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    The role of heat treatment on the structural and nano-mechanical properties of SmCo5 thin films grown by RF magnetron sputtering technique
    (Elsevier Sci Ltd, 2017) Kuru, M.; Ozmetin, A. E.; Ozmetin, A.; Sahin, O.
    In this study, the influence of annealing temperature on structural, morphological, and nano-mechanical properties of SmCo5 thin films, which was produced by RF magnetron sputtering technique, was investigated. A set of 1 mu m thick SmCo5 thin films were grown on a Si (100) substrate at room temperature, and subsequently annealed at 400 degrees C, 500 degrees C, 600 degrees C, and 700 degrees C in an argon atmosphere. These films have a hexagonal CaCu5 structure with (110) preferential orientation corresponding to SmCo5 films observed. The Structural morphological and nano-mechanical properties of SmCo5 thin films were examined using the Grazing Incident X-ray Diffraction (GIXRD), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM) and Nano indentation techniques. Results showed that the as-deposited SmCo5 thin films had a polycrystalline structure. Following the heat treatment, both crystallite and grain size increased and thin film crystallinity improved. In addition, nano-hardness and reduced elastic modulus of the SmCo5 thin films were measured with a Berkovich tip. Nano hardness and reduced elastic modulus values decrease with the increasing annealing temperature.