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Öğe Assessment of the Mechanical and Corrosion Properties of Mg-1Zn-0.6Ca/Diamond Nanocomposites for Biomedical Applications(Mdpi, 2022) Sevik, Huseyin; Ozarslan, Selma; Dieringa, HajoIn this work, the microstructure, mechanical properties, and corrosion behavior of the Mg-1Zn-0.6Ca matrix alloy (ZX10), reinforced by adding various amounts of nanodiamond particles (0.5, 1, and 2 wt.%), prepared by the ultrasound-assisted stir-casting method, were investigated as they are deemed as potential implant materials in biomedical applications. Microstructure, nanoindentation, mechanical tensile, immersion, and potentiodynamic polarization tests were performed for evaluating the influence of the addition of nanodiamond particles on the alloy's mechanical and biocorrosion properties. The results revealed that the addition of nanodiamond particles causes a reduction in the alloy's grain size. The alloy's nanohardness and elastic modulus values increased when the amount of added nanodiamond particles were increased. The nanocomposite with an addition of 0.5% ND showed the best composition with regard to an acceptable corrosion rate as the corrosion rates are too high with higher additions of 1 or 2% NDs. At the same time, the yield strength, tensile strength, and elongation improved slightly compared to the matrix alloy.Öğe Bone cutting performance and mechanical properties of piezo-surgical tips: a nano-indentation study(Cukurova Univ, Fac Medicine, 2023) Guzel, Buenyamin; Arpag, Osman Fatih; Ozarslan, Selma; Haskan, Ahmet Can; Salimov, FarizPurpose: The aims of this study were to compare the mechanical properties of piezo-surgical tips such as nano -hardness, elastic modulus, surface roughness, and wear level, and to measure their cutting performance. Materials and Methods: In this study, 31 piezo-surgical tips were used, three for control and 28 for testing. The testing tips were equally divided into four groups with different numbers of osteotomies: the four-, 8-, 16-, and 32-osteotomy groups. The mean osteotomy duration was recorded during osteotomy. Scanning electron microscopy images of the tips in the test groups were obtained before and after osteotomy, and the wear level of the tips was measured. Results: A statistically significant increase was observed in the nano-hardness of the piezo-surgical tips depending on the number of osteotomy (for 4-use; 22.47 +/- 1.67H and for 32-use; 28.49 +/- 3.42H). The elasticity value of the testing tips was in the range of 218.55 +/- 15.74E to 241.26 +/- 10.46E, and all of the values were significantly higher than those in the control group (174.39 +/- 13.53E). As the frequency of use increased, a significant increase in surface roughness was observed (from 16.67 +/- 1.50 to 56.12 +/- 2.60). A positive correlation was found between the frequency of use and the wear level of the tips, and between the surface roughness and wear level of the tips. Conclusion: With the increase in the number of osteotomies, significant changes in the mechanical and physical properties of the piezo-surgical tips that affected their bone-cutting performance were observed.Öğe Effect of Al2O3 Nano Particle Addition on Mechanical Properties and Creep Behaviour of High Pressure Die Cast AZ91-1Sr Alloy(Taylor & Francis Ltd, 2022) Ates, Yusuf; Ozarslan, Selma; Yarkadas, Gueven; Sevik, HuseyinThe AZ91-1Sr alloy, the 0.5, 1 and 2 vol.% Al2O3/AZ91-1Sr nanocomposites were fabricated by high pressure die casting method and investigated the effect of nano Al2O3 particles on the mechanical properties and creep behaviour of the AZ91-1Sr alloy. Mechanical and creep tests disclosed remarkable enhancements in the yield strength, tensile strength, hardness and creep resistance of the AZ91-1Sr alloy with addition of nano Al2O3 particles. The best results were obtained in the case of the addition of 2 vol.% Al2O3 nano particles.Öğe Effect of Lanthanum on mechanical and wear properties of high-pressure die-cast Mg-3Al-3Sn-3Sb alloy(Walter De Gruyter Gmbh, 2021) Yarkadas, Guven; Kumruoglu, Levent Cenk; Ozarslan, Selma; Sevik, HuseyinIn the present study, the effect of an La alloying element with different quantities (1, 3 and 5 wt.-%) on the microstructure, mechanical and dry sliding wear properties of Mg-3Al-3Sn-3Sb alloy was investigated. The wear tests were done on the alloys using pin on-disk equipment against a 4140 steel disc as counterpart under three different sliding velocities of 0.3, 0.6 and 1.2 ms(-1) and four different loads of 5, 10, 20 and 40 N. The microstructural results showed that the new intermetallic phases (La5Sn3 and LaSnSb2) were formed with addition of La to the main alloy. Also, it was observed that the hardness of the Mg-3Al-3Sn-3Sb alloy was raised with increasing La addition. Furthermore, the tensile properties of the Mg-3Al-3Sn-3Sb alloy improved with rising La content at room and elevated temperature. The wear rates of the alloys increase with increasing of the sliding speed and load. In addition to this, the wear rate of the Mg-3Al-3Sn-3Sb alloy was found to be higher than that of the La content alloys for all test conditions.Öğe Fabrication and Characterization of a Multifunctional Coating to Promote the Osteogenic Properties of Orthopedic Implants(Mdpi, 2023) Koc, Serap (Gungor); Baygar, Tuba; Ozarslan, Selma; Sarac, Nurdan; Ugur, AyselTitanium-based alloys are used in orthopedic applications as fixation elements, hard tissue replacements in artificial bones, and dental implants. Despite their wide range of applications, metallic implant defects and failures arise due to inadequate mechanical bonding, postoperative clotting problems, aseptic loosening, and infections. To improve the surface bioactivity and reduce the corrosion rate of the Ti6Al4V alloy, multi-layered coatings (HAp, BG, Cs, and Hep) were applied via electrophoretic deposition (EPD). XRD images showed the presence of HAp within the coating. In vitro investigation: cell line NIH-3T3 fibroblasts were seeded on the non-coated and coated Ti6Al4V substrates, and their cellular behavior was evaluated. The results indicated that the HApBGCsHep coating could enhance the adhesion and proliferation of NIH 3T3 cells. In addition, the potentiodynamic polarization results are compatible with the in vitro outcome.Öğe Investigation of Biodegradable Ternary Mg-Zn-La Magnesium Alloys(Amer Inst Physics, 2018) Ozarslan, Selma; Sevik, Huseyin; Sorar, IdrisIn this paper, the effect of Lanthanum (1, 2 and 4 wt.%) addition to biodegradable Mg-4Zn alloy and its influence on the microstructure and mechanical properties of the alloy were investigated. The alloys were produced under protective atmosphere by a cold chamber high pressure-die casting process. Microstructure analysis of the samples were carried out by scanning electron microscopy (SEM), an energy-dispersive spectrometer (EDS) and X-ray diffraction (XRD). X-ray difractometry revealed that the main phases are alpha-Mg and MgZn in the whole alloys. Also, the Mg17La2 phase was observed with addition of La. Hardness and tensile properties were examined to investigate the mechanical properties. Results showed that the yield strength and nanohardness of main alloy were improved from 40 % (100 MPa to 140 MPa), 24 % (from 1.04 GPa to 1.29 GPa) with addition of 4 wt.% La, respectively. However, elongation was decreased with increasing of La content.Öğe Investigation of Microstructural, Mechanical and Corrosion Properties of Biodegradable Mg-Sn-Y Alloys(Springer Int Publ Ag, 2024) Ozarslan, Selma; Sorar, Idris; Sevik, HuseyinIn this study, biodegradable magnesium alloys were produced using the high pressure die casting (HPDC) technique. Effects of Y addition on microstructure, mechanical properties and corrosion behaviors of as-cast Mg-4Sn-xY (x = 0, 1, 2, 4 wt.%) alloys are investigated. The surface morphology of the alloys was examined using field emission scanning electron microscopy (FE-SEM) and the microstructure was examined using energy dispersive spectroscopy (EDS), respectively. Tensile and hardness tests were carried out to examine the mechanical properties. Microstructural studies have shown that the addition of yttrium causes a reduction in the grain size of the alloy and the formation of Sn3Y5 and MgSnY intermetallic compounds with high melting temperature, as well as Mg2Sn intermetallic. While, the maximum tensile strength value is achieved with the addition of 1% yttrium by weight, the increase in yield strength, elongation percentage and hardness values continue with the addition of more yttrium. Corrosion tests have shown that the addition of yttrium to the Mg-Sn alloy increases the corrosion resistance of the alloys due to microstructural changes. The Mg-4Sn-4Y alloy is found to be a promising biodegradable magnesium alloy especially for orthopedic applications.Öğe Investigation of Microstructural, Mechanical, Wear, and Corrosion Properties of Mg-Sb-La Alloys(Springer, 2022) Ozarslan, SelmaThe microstructural, mechanical, corrosion properties, and wear behaviors of as-cast Mg-Sb-based alloys with various La contents (0, 1, 2, and 4 wt.%) were investigated. The microstructural properties were analyzed by x-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The tensile and microhardness tests were carried out to examine the mechanical properties. Corrosion properties were investigated in 3.5 wt.% NaCl using both electrochemical and immersion tests. Wear tests were carried out at three different loads of 10, 20 and 40 N and at three different sliding speeds of 0.3, 0.6 and 1.2 m/s. The results showed that the Mg-Sb alloy had alpha-Mg and Mg3Sb2 phases, and La4Sb, LaSb and Mg17La2 phases were formed by the addition of La. The yield strength and hardness continuously increased along with the increasing La content, while tensile strength and ductility first increased and then decreased by the addition of 2 wt.% La. It was observed that the corrosion resistance improved by the addition of 1 wt.% La, and the addition of more La worsened the corrosion resistance, and the best wear rate was obtained by the addition of 1 wt.% La.Öğe Microstructure, mechanical and corrosion properties of novel Mg-Sn-Ce alloys produced by high pressure die casting(Elsevier, 2019) Ozarslan, Selma; Sevik, Huseyin; Sorar, IdrisThe aim of this study was to investigate the effect of adding 1, 2 and 4% wt of cerium on the microstructure, mechanical and corrosion properties of high pressure die casting (HPDC) Mg-4Sn alloys. Microstructure analyses of the alloys were carried out using X-Ray Diffraction (XRD) and Scanning Electron microscopy (SEM). The corrosion behaviors were determined with the potentiodynamic polarization and immersion tests in Hanks Balanced Salt Solution (HBSS), which is used as the artificial body fluid. The microstructural results showed that the addition of Ce to the main alloy creates new intermetallic phases (Ce5Sn4 and MgSnCe). In addition, Ce addition provided effectively the grain refinement of the alloys. While the hardness and yield strength of the Mg-4Sn alloy enhanced continuously with increasing Ce content, the tensile strength and elongation reached up to 2% wt. The corrosion resistance of the main alloy was improved by the addition of 1% wt of Ce. However, the Ce content, which is more than 1% wt decreased corrosion resistance.
