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Öğe Effect of Cu addition on porous NiTi SMAs produced by self-propagating high-temperature synthesis(De Gruyter, 2019-12) Batı, Serkan; Kılıç, Musa; Yenigün, Burak; Balaban, Zülküf; Kırık, İhsanThe focus of the study is on the effect of copper addition on the porosity, microstructure and mechanical properties of hot pressed NiTi and NiTiCu shape memory alloys (SMAs), ignited by means of self-propagating high-temperature synthesis (SHS). Optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), hardness tests and compression tests were applied respectively to determine the microstructure and mechanical behavior of the samples. The experimental results show that the addition of Cu into NiTi SMAs increases porosity and microhardness but also reduces compressive strength.Öğe Friction welding of dissimilar AISI 304 and AISI 8640 steels(European Journal of Technique (EJT), 2016-08-01) Batı, Serkan; Kılıç, Musa; Kırık, İhsanThis study investigates the joinability of AISI 8640 heat treatable steel and AISI 304 austenitic stainless steel combined with friction welding. These steels have completely different properties and widely used in industrial applications. Welding is applied on steels with the parameters of 1800 rev/min turning speed, 50 MPa friction pressure and 2, 4, 6, 8 and 10 sec friction time by using continuously driven friction welding machine. After the welding process, tensile and hardness testing applied to determine tensile and hardness strength of welded samples. Additionally, in order to determine the microstructural features, research using the optical microscope, scanning electron microscope (SEM) with Energy-dispersive Xray spectroscopy (EDS) analysis tests were done. According to the information derived from the results, AISI 304 and AISI 8640 steels joined with friction welding without any problemÖğe Production of Intermetallic FGM(Middle East Journal of Technic (MEJT), 2017-01) Batı, Serkan; Kılıç, Musa; Kırık, İhsanNiAl and NiTi intermetallic materials are among advanced technology materials that have outstanding mechanical and physical properties for high temperature applications. Particularly, creep resistance, low density and high hardness properties stand out in such intermetallics. It is known that Ni-Al intermetallics are commonly used in various application fields with the addition of Ti for improving properties there of (in terms of low density, high hardness and shear strength) in the produced intermetallics. In this study, with different features -325 mesh Al, Ni and Ti powders are mixed to form NiTi, Ni3Al and NiAl in atomic ratio. Sintering process was used in this study by adding different amounts of powder mixture. The mixed powders were pressed at a pressure of 100 MPa in a metal die at room temperature. Three important intermetallic compounds were produced by SHS method, by using different process parameters to obtain functionally-graded materials having different features of NiAl, Ni3Al and NiTi alloys. Analyses were conducted metallographically on the samples after producing, face propagation were calculated and hardness were determined
