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Öğe Effect of different heat treatment conditions on microstructural and mechanical behaviour of AZ63 magnesium alloy(Taylor and Francis Ltd., 2015) Incesu, A.; Gungor, A.In this study, influence of different heat treatment conditions on microstructure, microhardness, yield strength, ultimate tensile strength, elongation and phase distribution of AZ63 magnesium alloy were discussed. All specimens were taken from as cast commercial AZ63 magnesium alloy. Solution heat treatment was applied at 400 °C for 16 h. After air cooling the specimens to room temperature, the specimens were aged at two different temperatures; 160, 190 °C and five different durations; 1, 3, 6, 9 and 12 h. The effects of heat treatment conditions on the mechanical and microstructural properties of AZ63 magnesium alloy were determined by tensile and microhardness tests, SEM, EDX and XRD analyses, respectively. It was observed that, after the solution treatment, a weak intermetallic phase of Mg 17 Al 12 was dissolved almost totally in the matrix. During ageing, this phase precipitated in the grains and also on the grain boundaries homogeneously depending on the ageing temperatures and times. © 2015, © 2015 Taylor & Francis.Öğe Effects of alloying elements and thermomechanical process on the mechanical and corrosion properties of biodegradable Mg alloys(Keai Publishing Ltd, 2021) Gungor, A.; Incesu, A.In this study, four different Mg-Zn-Ca-Mn alloys were produced using gravity die casting method. Mn content was kept constant in all alloys, while Zn and Ca were added in two different ratios. Homogenization heat treatment was applied to all cast alloys and a specimen from each homogenized alloy was hot rolled. Microstructure, mechanical properties, and corrosion behavior of the homogenized and hot rolled alloys were investigated as comparatively. Following results were obtained; grain size decreased significantly with increasing Zn content, Zn promoted Ca2Mg6Zn3 phase formation, corrosion resistance increased with increasing Zn/Ca atomic ratio, hot rolling resulted in much higher tensile strength but much lower ductility and toughness. Among the homogenized and hot rolled alloys, ZXM300-h alloy (hot rolled ZXM300 alloy) with its 146 +/- 2.5 MPa yield strength, 229 +/- 3.7 MPa tensile strength,% 1.6 +/- 0.1 elongation and 0.029 mm/yr immersion corrosion rate exhibited the best mechanical properties and corrosion resistance to be used as a biodegradable alloy such as fracture bone plate material. (C) 2020 Published by Elsevier B.V. on behalf of Chongqing University.Öğe Improvement of mechanical properties of NiAl-Cr(Mo) alloy by Ti addition(Natl Inst Optoelectronics, 2015) Demirtas, H.; Gungor, A.In this study, the influence of 4, 5 and 6 at.% Ti addition on the mechanical properties of NiAl-Cr(Mo) eutectic alloy was investigated. The microstructure of the alloys were determined by using XRD, SEM, EDX analyses and mechanical properties were investigated by micro and macro hardness measurements and compression tests at room temperature and 1000 degrees C. The results showed that Ni2AlTi Heusler phase precipitated in all Ti-added alloys and Ti addition inhibited eutectic cell formation by transforming lamellas Cr(Mo) phase into Cr(Mo) dendrites. In addition, hardness, room temperature and high temperature mechanical properties of NiAl-Cr(Mo) alloy improved significantly with the Ti addition.Öğe Improvement of mechanical properties of NiAl-Cr(Mo) alloy by Ti addition(National Institute of Optoelectronics, 2015) Demirtas, H.; Gungor, A.In this study, the influence of 4, 5 and 6 at.% Ti addition on the mechanical properties of NiAl-Cr(Mo) eutectic alloy was investigated. The microstructure of the alloys were determined by using XRD, SEM, EDX analyses and mechanical properties were investigated by micro and macro hardness measurements and compression tests at room temperature and 1000 °C. The results showed that Ni2 AlTi Heusler phase precipitated in all Ti-added alloys and Ti addition inhibited eutectic cell formation by transforming lamellas Cr(Mo) phase into Cr(Mo) dendrites. In addition, hardness, room temperature and high temperature mechanical properties of NiAl-Cr(Mo) alloy improved significantly with the Ti addition. © 2015, National Institute of Optoelectronics. All rights reserved.Öğe Mechanical properties of iron powder filled high density polyethylene composites(Elsevier Ltd, 2007) Gungor, A.Mechanical properties of high density polyethylene (HDPE) and HDPE containing 5, 10 and 15 vol.% Fe polymer composites were investigated experimentally. Composite materials were prepared with a twin screw extruder and injection moulding. Microstructure of fracture surface, yield and tensile strength, % elongation, the modulus of elasticity, Izod impact strength (notched), and hardness (Shore D) were determined for each sample. It was found that iron particles had significant impact on the mechanical properties of HDPE. As compared to the mechanical properties of unfilled HDPE, Fe filled polymer composites showed lower yield and tensile strength, % elongation, and Izod impact strength, while the modulus of elasticity and hardness of the composites were higher than those of HDPE. Addition of 5 vol.% Fe reduced Izod impact strength and % elongation of HDPE about 40% and 90% respectively and increased the modulus of elasticity of HDPE about 31%. © 2005 Elsevier Ltd. All rights reserved.Öğe Microstructure and mechanical properties of Fe-doped NiAl-28Cr-6Mo eutectic alloys(Elsevier Science Bv, 2016) Gungor, A.; Demirtas, H.Room temperature and high temperature microstructural and mechanical properties of arc melted NiAl-28Cr-6Mo eutectic alloys doped with 0.1% Fe, 0.2% Fe and 0.5% Fe (mole fraction) were investigated. The homogenization heat treatment of the alloys was conducted at 1300 degrees C in Ar atmosphere. Microscopic analyses, hardness measurements, XRD measurements and compression tests were used to characterize the alloys. As-cast and homogenized alloys exhibit fine cellular eutectic structures with coarse intercellular eutectic structure. The increase in the content of Fe results in coarsening eutectic layers and the decrease in eutectic cells. All alloys have very high compressive stress and strain at room temperature. The addition of Fe has small negative impact on the strength and ductility of the alloys at room temperature. However, the addition of Fe increases the high temperature strength of the alloy. High temperature XRD patterns show that peaks shift to lower Bragg angles. This indicates that the lattice parameter of the alloys increases.Öğe The physical and mechanical properties of alumina-based ultralow cement castable refractories(Elsevier Sci Ltd, 2012) Gungor, A.; Celikcioglu, O.; Sahin, S.In this study, the effects of the type of alumina on the physical, chemical and mechanical properties of the ultralow cement castable (ULCC) refractories were investigated. Brown fused alumina, tabular alumina and rotary bauxite-based ULCC refractories were prepared by mixing each type of alumina with silicon carbide, carbon, cement, metallic silicon and microsilica. The density, porosity and cold crushing strength (CCS) of the refractory castables were measured after drying at 110 degrees C for 24 h and firing at 1450 degrees C for 5 h. The slag penetration resistance of the refractory castables was determined using slag corrosion tests. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and X-ray diffractometry (XRD) were used to characterize the castables. It was found that all three refractory castables had strong slag penetration resistance and that the tabular alumina-based refractory castable had the largest specific cold crushing strength with an acceptable percent of porosity among the refractory castables. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.Öğe The synthesis and mechanical characterisation of laminated hybrid-epoxy matrix composites(Taylor & Francis Ltd, 2017) Sismanoglu, S.; Gungor, A.; Aslan, B.; Sen, D.High-performance and lightweight laminated hybrid composites were fabricated by using epoxy-impregnated carbon, Kevlar and hybrid fabrics. Carbon-Kevlar, carbon-hybrid, carbon-Kevlar-hybrid, and Kevlar-hybrid fabric epoxy matrix composites with 12 layers were synthesised using vacuum bag method. Tensile and three-point bending tests were used to determine the modulus of elasticity, % elongation, tensile strength, bending moment and bending strength of hybrid composites. The highest tensile strength, bending strength and bending moment were observed from carbon-Kevlar-epoxy matrix composite, while the lowest values were observed from the carbon-hybrid-epoxy matrix composite.Öğe The Synthesis and Mechanical Characterization of Laminated Hybrid-Epoxy Matrix Composites(Agro Arge Danismanlik San Ve Tic As, 2016) Sismanoglu, S.; Gungor, A.; Asian, B.; Sen, D.High performance and light weight laminated hybrid composites were fabricated by using epoxy impregnated carbon, kevlar and hybrid fabrics. Carbon-kevlar, carbon-kevlar-hybrid, kevlar-hybrid and hybrid-carbon fabric epoxy matrix composites with 12 layers were synthesized by using vacuum bag method at 170 degrees C temperature for 150 minutes. Composite materials were compared in terms of their flexibility and strength properties by using tensile and bending tests. Elasticity modulus, % elongation, tensile tension, fracture tension, bending moment, bending strength were determined according to the tests results. The highest tensile strength, bending strength and bending moment were observed in carbon-kevlar-epoxy matrix composite, while the lowest values were obtained from carbon-hybrid-epoxy matrix composite.Öğe Wear performance investigation of AlSi8Cu3Fe aluminum alloy related to aging parameters(MIM RESEARCH GROUP, 2019) Baser, E.; Incesu, A.; Sismanoglu, S.; Gungor, A.Aluminum silicon alloys are the most preferred alloys for industrial applications due to their ease of production and lightness. It is important to improve the mechanical properties of these materials in order to increase their usage. Wear properties are one of these mechanical properties that can be improved. In this present investigation, 3 different artificial aging durations; 2hrs, 4 hrs, 8 hrs aging at 200 ?C were applied after solution heat treatment for 4 hrs. at 540 ?C to the AlSi8Cu3Fe alloy. Microstructural analysis, mechanical tests were applied to understand the effect of aging parameters on wear performance and also hardness values of AlSi8Cu3Fe alloy. According to the results obtained from tests and analyzes, the highest wear resistance was reached on the 4 hrs. aged sample. © 2019 MIM Research Group. All rights reserved.
