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Öğe B4 c takviyeli alüminyum matris kompozitlerin farklı çözeltilerdeki korozyon davranışları(2020) Simsek, Ijlal; Simsek, Doğan; Özyürek, DursunBu çalışmada mekanik alaşımlama yöntemi ile üretilen %12 B4C takviyeli Al%2 grafit matrisli kompozit malzemenin farklı çözeltilerdeki korozyon davranışıincelenmiştir. Hazırlanan tozlar planeter tip alaşımlama cihazında mekanikalaşımlanmıştır. Mekanik alaşımlanan tozlar, hidrolik preste 750 MPa basınçaltında soğuk preslenerek ham numuneler üretilmiştir. Üretilen ham numuneler600°C sıcaklıkta 2 saat sinterlenmiştir. Korozyon testleri iki farklı çözeltide (%3,5NaCl ve 0,1 M H2SO4) potansiyodinamik polarizasyon yöntemi ile yapılmıştır.Korozyon testleri sonucunda, NaCl çözeltisinde H2SO4 çözeltisine göre düşükakım yoğunluğu elde edilmiştir. Ayrıca elektrokimyasal empedans ölçümlerindeH2SO4 çözeltisi içerisinde, Nyquist eğrisinin daha düşük bir yarım daire çapına vedüşük frekanslarda endüktif bir döngüye sahip olduğu görülmüştür.Öğe Corrosion Behaviour of 17-4 PH Stainless Steels Produced by Adding Different Amounts of Alloying Element and Aged at Different Times(Maik Nauka/Interperiodica/Springer, 2023) Kocak, Salih cagatay; Simsek, Dogan; Simsek, Ijlal; Ozyurek, DursunIn this study the corrosion behaviour of 17-4 PH (precipitation hardening) stainless steel alloys, produced by adding Ta different amounts with the method of powder metallurgy, and aged at different times was investigated. Four different amounts tantalum (0.15, 0.30, 0.45 and 0.60% weight) was added to the alloy. The prepared powders were produced green compacts at circle minus 10 x 6 mm dimensions (800 MPa) after mixing with turbule for 2 hours. Green compacts produced were sintered for 1 h at 1300 degrees C under a vacuum of 10-6 mbar. The sintered samples were aged 1, 4 and 8 hours at 480 degrees C after being in solution at 1050 degrees C. Polarization measurements were performed in a corrosion cell, using three different electrode technique. In the corrosion tests, 0.1 M H2SO4 was used as the electrolyte medium. As a result of the studies, the alloy the hardness and densities were increased with increasing Ta amount. Similarly, the hardness and densities of produced samples were with increasing aging time. The corrosion tests revealed that increasing the amount of Ta added to the alloy increased the alloy's resistance to corrosion. The alloy's corrosion resistance decreased as aging time increased. The active corrosion mechanism was seen to be pitting corrosion in all alloys.Öğe Dry Sliding Wear Behaviors of Iron Addition to Nickel-Aluminum Bronze Produced by Mechanical Alloying(Springer India, 2020) Simsek, Dogan; Colak, Niyazi Y.; Simsek, Ijlal; Ozyurek, DursunIn this study, different amounts of iron are added to nickel-aluminum bronze produced by mechanical alloying and its effects on microstructure, hardness, and wear behaviors are investigated. Four different amounts of Fe (3.5, 4, 4.5, and 5 wt%) was added to Cu10Al5Ni alloy and mechanically alloyed for 60 min. After cold pressing (600 MPa), the alloy powders were sintered at 800 degrees C and cooled in furnace to room temperature. The samples were characterized with scanning electron microscope (SEM + EDS), X-ray diffraction and hardness and density measurements. Wear tests were performed using a block-on-ring wear testing device with 0.2 m/s sliding velocity, four different sliding distances (400-1600 m) and three different loads (10 N, 20 N, and 30 N). As a result of the studies, it was found that the hardness value increased, and the density decreased with increasing Fe amount. Cu10Al5Ni containing 5% Fe was measured with the highest hardness value (55.74 HV) and the lowest density value (7.72 g/cm(3)). Also, Fe- and Ni-rich kappa intermetallic compounds were formed in the microstructure of the alloy. The wear tests showed that the alloy containing 5% Fe had the lowest weight loss and wear rate as well.Öğe The effect of b4 c amount on wear behaviors of al-graphite/b4 c hybrid composites produced by mechanical alloying(2019) Simsek, IjlalIn this study, wear behavior of composite materials produced by mechanical alloyingmethod adding different amounts of B4C in the Al-Gr matrix were investigated. Afteradding 2% (vol.) graphite to the aluminum matrix, 3 different amounts (3%, 6% and9%) of B4C were added. The composite powders prepared were mechanically alloyedfor 60 minutes. The milled powders were cold-pressed under 700 MPa pressure. Thegreen compacts produced were sintered at 600 °C for 120 minutes. The sintered B4Creinforced aluminum composite materials were characterized by the Scanning Electron Microscope, X-ray diffraction, and hardness and density measurements. Weartests were performed on a standard pin-on-disc wear testing device with a load of 20N at a sliding speed of 0.5 ms-1 and four different sliding distances (between 250-1000m) according to ASTM G99 standard. As a result of the studies, the hardness increasesas the amount of B4C in the composite material increases, while the density of AMCdecreases. As a result of the wear tests, the highest weight loss was obtained in thenon-reinforced Al-Gr matrix alloy, while the lowest weight loss was obtained in 9% B4Creinforced composite materials. However, it was observed that there was a decreasein the friction coefficient with increasing amount of reinforcement.Öğe Effects of Different Solid Solution Temperatures on Microstructure and Mechanical Properties of the AA7075 Alloy After T6 Heat Treatment(Walter De Gruyter Gmbh, 2019) Tekeli, Suleyman; Simsek, Ijlal; Simsek, Dogan; Ozyurek, DursunIn this study, the effect of solid solution temperature on microstructure and mechanical properties of the AA7075 alloy after T6 heat treatment was investigated. Following solid solution at five different temperatures for 2 hours, the AA7075 alloy was quenched and then artificially aged at 120 degrees C for 24 hours. Hardness measurements, microstructure examinations (SEM+EDS, XRD) and tensile tests were carried out for the alloys. The results showed that the increased solid solution temperature led to formation of precipitates in the microstructures and thus caused higher hardness and tensile strength.Öğe Influence of Mechanical Alloying Time on Microstructure and Wear Behaviors of Fe-Cu-C Alloy(Korean Inst Metals Materials, 2021) Buyukkayaci, Elvan; Simsek, Ijlal; Ozyurek, DursunIn the present study, the influence of mechanical alloying time on microstructure and wear behavior was investigated for Fe-Cu-C alloy produced with powder metallurgy method. Within the scope of the study, Fe, Cu and C powders were mechanical alloyed using various milling time (15, 30, 60, 90 and 120 min). After pressing (600 MPa) compacts were produced, the alloy powders were sintered for 1 h at 1150 degrees C in the atmosphere-controlled furnace. After sintering, the specimens were prepared for microstructure examinations and wear testing. Wear tests were done using pin-on-disc device under various loads (10-30 N), sliding distances (400-2000 m) and 1 ms(-1) constant sliding speed. Result of the study showed that powder size increased in Fe-Cu-C alloys up to 60 min mechanical alloying time. Maximum density and hardness values in Fe-Cu-C alloys were obtained in Fe-Cu-C alloy with 60 min mechanical alloying. In addition, the highest weight loss in wear tests was achieved in 120 min MA'ed specimen, while the lowest weight loss was achieved in 60 min MA'ed one. GraphicÖğe Investigation of the effect of second phase precipitates on the corrosion and electrical conductivity of 7075 aluminum alloys(Emerald Group Publishing Ltd, 2019) Simsek, IjlalPurpose This paper aims to investigate the effects of second phase precipitate size on microstructure, hardness, density, corrosion and electrical conductivity of 7075 aluminum alloy fabricated by the powder metallurgy method and aged at 120 degrees C for various aging periods. Design/methodology/approach For the aging process (T6), these alloys were solution-treated at 485 degrees C for 2 h, quenched, aged at 120 degrees C for four various periods and finally air cooled. After the aging process, these alloys were examined with scanning electron microscope, X-ray diffraction, density and hardness measurements. The corrosion tests were carried out using the potentiodynamic polarization technique; electrical conductivity values were measured as IACS%. Findings Results showed that the precipitate size increased with increasing aging period and the maximum precipitate size was achieved for the sample aged for 28 h. The maximum hardness was attained for the sample aged for 24 h, while the same specimen obtained the lowest electrical conductivity and corrosion resistance. Originality/value In this research, second phase precipitates of heat treatment processing affected the electrical conductivity and corrosion behavior of the 7075 aluminum alloy. Also it is understood that the heat treatment period is an effective parameter on these properties.Öğe Investigation of the effects of Mg amount on microstructure and wear behavior of Al-Si-Mg alloys(Elsevier - Division Reed Elsevier India Pvt Ltd, 2019) Simsek, Ijlal; Ozyurek, DursunIn this study, the effect of the Mg amount on microstructure and wear behaviors of A356 cast aluminum alloys is investigated. Al-Si-Mg alloys containing different amounts of Mg were produced by casting. The alloys were then aged at 170 degrees C for 10 h (T6). After T6 heat treatment, the samples were prepared for microstructure examinations and wear testing. Wear tests were performed with a pin-on-disc type wear testing device. Results of the study show that the hardness increases and the density decreases as the Mg fraction increases in the alloy. As a result of the wear test, the A356-0.43Mg alloy was found to have the highest weight loss and wear rate, whereas the A356-0.86Mg alloy has the lowest weight loss and wear rate. (C) 2018 Karabuk University. Publishing services by Elsevier B.V.Öğe Investigation of the wear and corrosion behaviors of Ti5Al2.5Fe and Ti6Al4V alloys produced by mechanical alloying method in simulated body fluid environment(Elsevier, 2019) Simsek, Ijlal; Ozyurek, DursunIn this study, wear and electrochemical corrosion behaviors of the Ti5Al2.5Fe and Ti6Al4V alloys produced with the mechanical alloying method were examined in simulated body fluid environment. Ti5Al2.5Fe and Ti6Al4V powders were produced by grinding elemental powders in the mechanical alloying device for 120 min. The sintered alloys were characterized SEM, XRD, hardness and density measurements. Wear tests were performed in simulated body fluid environment using a pin-on-disk type wear testing device, under three different loads at four different sliding distances with 1 ms(-1) sliding speed. Corrosion tests were performed using the potentiodynamic polarization technique and a cyclic polarization measurement. The density of the MA'ed Ti5Al2.5Fe and Ti6Al4V alloys respectively was measured as 4.314 g/cm(3) and 4.427 g/cm(3) and its hardness was found as 706.6 HV and 630 HV. Also, it was found dominant alpha-Ti phase in the alloys' structure. The wear resistance of Ti5Al2.5Fe alloy is higher than that of Ti6Al4V alloy. According to the corrosion test results, the I-corr value of the Ti5Al2.5Fe alloy was measured to be 18.24 mA/cm(2), and the I-corr value of the Ti6Al4V alloy was measured to be 43.58 mA/cm(2). The corrosion resistance of Ti5Al2.5Fe alloy is higher than that of Ti6Al4V alloy. After corrosion tests, formation of pits of different sizes on the surface of Ti5Al2.5Fe and Ti6Al4V alloys was found to dominate the pitting corrosion mechanism.Öğe Investigation of the wear behavior in simulated body fluid of 316L stainless steels produced by mechanical alloying method(Elsevier - Division Reed Elsevier India Pvt Ltd, 2021) Dincel, Oznur; Simsek, Ijlal; Ozyurek, DursunIn the present study, the wear behavior of 316L stainless steels (SS) produced with mechanical alloying (MA) method was investigated in simulated body fluid. Alloys produced in different MA times were sintered for 2 h at 1300 degrees C temperature. Specimens prepared with standard metallographic procedures after sintering, scanning electron microscopy, X-ray diffraction, powder size analyses, hardness, and density measurements were performed. Wear tests were carried out in pin-on-disc type wear device, Kokubo simulated body fluid and body temperature environment (in vitro). Surface roughness was measured before and after the wear test under 40 N at four different sliding distances with 1 ms(-1) sliding speed. Results showed that the powder size decreased as the milling time increased and the lowest powder size was measured for the powder milled for 120 min. The highest hardness and lowest weight loss were achieved in specimens milled for 60 min, while the highest average surface roughness was achieved in specimens milled for 30 min. (C) 2020 Karabuk University. Publishing services by Elsevier B.V.Öğe Investigation of Wear and Corrosion Behaviors of Ti15Mo Alloy Produced by Mechanical Alloying Method in SBF Environment(Springer, 2019) Simsek, Ijlal; Ozyurek, DursunThis study aims to examine the wear performance and electrochemical corrosion properties of Ti15Mo alloy produced by mechanical alloying (MA) in simulated body fluid (SBF) environment. Ti15Mo alloy was produced by milling in a mechanical alloying device for 120 min. The alloys produced are examined using SEM, X-ray diffraction, hardness and density measurements. Three different loads, four different sliding distances and 1 m center dot sec(-1) sliding speed were used in the tests performed in SBF environment. Corrosion tests were carried out using potentiodynamic polarization technique, cyclic polarization measurement at 37 degrees C body temperature, in SBF, with a scan interval of +/- 750 mV and scan rate of 1 mV/sec. Density and hardness measurement results of MA'ed Ti15Mo alloy are 4.93 g/cm(3) and 299.5 HV, respectively. As a result of increasing the load applied during the wear tests, the resistance of the samples against wear has decreased and the amount of wear has increased. Corrosion tests showed that the potentiodynamic polarization parameters were 36.969 mA/cm(2) for I-corr value and 0.54448 mmpy for corrosion rate. Corrosion tests made in the environment of SBF and at body temperature revealed that there was very little pitting corrosion observed in MA'ed Ti15Mo alloy.Öğe Investigation of Wear Behaviors of SiO2 Reinforced Aluminium Composites Produced by Pressureless Infiltration Method(Gazi Univ, 2019) Simsek, Ijlal; Yildirim, Musa; Ozyurek, Dursun; Simsek, DoganIn this study, the wear behaviors of SiO2 reinforced AA7075 matrix composites produced by pressureless infiltration method were investigated in the scope of the work, 10%, 20%, 30%, and 40% SiO2 were added into AA7075 Al alloy and produced by infiltration method. Produced samples' density values were measured by Archiment method, hardness values were measured in micro hardness device under 2 N load. Wear tests were performed using 1 ms(-1) sliding speed at five difference sliding distance under 15 N load by pin-on-disc type apparatus. As a result of the study, the density values were decreased by increasing SiO2 amount and hardness values were increased by increasing SiO2 amount. In addition the weight loss and friction coefficient were decreased depending on increasing of SiO2 amount.Öğe Investigation of Wear Performance of Different Amount SiC Reinforcements A356 Matrix Composite Materials Produced by Semi-Solid Process Method(Gazi Univ, 2020) Simsek, Ijlal; Simsek, Dogan; Ozyurek, DursunIn this study, the wear performance of A356 matrix composite materials produced by different amount SiC reinforcement semisolid moulding method was investigated. In the A356 matrix, was added four different amounts (5%, 10, 15 and 20) SiC. Composite powders mixed without ball (30 minutes) in the vibrating type mill were cold pressed (800 MPa) and green compacts were produced. The produced green compacts, in 550 degrees C mold temperature and in 600 degrees C furnace temperature, 100 MPa pressing force was pressed for 1 minute. Produced samples were characterized with microstructure, hardness and sphericity ratio. The wear tests were performed using a pin on-disk type wear testing device with 0.2 ms(-1) sliding speed, under two different loads (30 and 60 N) and at four different sliding distances (500 m, 1000, 1500 and 2000). As a result of the studies, the hardness increases with increasing amount of SiC in the composite material, while the sphericity rates decrease. As a result of the wear tests, while the highest weight loss, 5% SiC was obtained, the lowest weight loss was obtained in 20% SiC additional composite materials.
