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Öğe Ca and Ce Effect on the Corrosion Resistance of Hot-Rolled AZ31 Mg Alloys(Dr D. Pylarinos, 2020) Kara, I.H.; Ahlatci, H.; Issa, Yousef, T.A.; Turen, Y.In this study, AZ31 Mg alloys with added Ca and Ce were produced by low pressure die casting and were rolled at 400°C. The corrosion properties of the materials were determined by immersion test for 72 hours at a 3.5% NaCl solution. The microstructure of the samples was investigated by light optical microscopy (LOM) and scanning electron microscopy (SEM) before the corrosion test. Twins, dynamic recrystallization (DRX), and the alloying elements have an important role in imparting the final corrosion resistance of the investigated materials. © 2020, Dr D. Pylarinos. All rights reserved.Öğe Developing Crumbed Rubber Tires/Epoxy Composite, by Surface Treatment with Different Silane Coupling Agents(Trans Tech Publications Ltd, 2022) Abdulhameed, J.I.; Ali, A.H.; Kara, I.H.Converting used tries to useful materials and avoiding harmful effects of accumulation used tires, is a great economic and environmental issue. Using of crumbing rubber of used tires CRT as filler materials shows declining in mechanical properties of CRT/polymer composites as weak bonding between CRT and polymeric matrices. This work include, CRT surface treating by three kinds of silane coupling agent, Trimethoxysilyl propyl methacrylate, 3-chloropropyl triethoxy silane and Silicic acid, before using as filler materials in epoxy matrix. 10 wt. % of non-treated and treated CRT/epoxy composite specimens have been prepared and tested to evaluate effect of CRT surface treatment into composite mechanical properties. The results show that modulus of elasticity, tensile strength, and fracture toughness of treated CRT/epoxy composite could improve by 56%, 30%, 36% respectively comparing with that of non-treated CRT/epoxy, after treating by 3-chloropropyl triethoxy silane coupling agent, whereas surface treating by other types of silane coupling agents could produce less mechnical improvement but still better that of non-treated. © 2022 Trans Tech Publications Ltd, Switzerland.Öğe The Immersion Corrosion Resistance of Shot Peening and MAO Applied on AZ31?0.5% La Sheets(Dr D. Pylarinos, 2020) Elmansouri, G.; Ahlatci, H.; Kara, I.H.; Turen, Y.In this study, the effect of Shot Peening (SP) and Micro Arc Oxidation (MAO) process on the corrosion resistance of 0.5% La with added AZ31 Mg alloy, hot rolled at different rolling speeds, was investigated. It was found that the surface of the rolled material at a rolling speed of 4.7m/min had higher surface smoothness values than the one rolled at 10m/min. It was observed that the corrosion rate changed in the first 40 of 168 hours. In the following hours, the corrosion rate showed different results according to the initial microstructure properties of the base materials. Initially, pore size was the dominant factor determining corrosion resistance, although, after coating, the corrosion rate was affected by the twins formed, based on rolling speed, which enhanced the corrosion rate between 48 and 168 hours. © 2020, Dr D. Pylarinos. All rights reserved.Öğe Microstructure and corrosion properties of homogenized AZ31 and AZ31+1%La magnesium alloys(Trans Tech Publications Ltd, 2017) Ahlatci, H.; Kara, I.H.; Turen, Y.; Sun, Y.; Zengin, H.Energy efficiency and decreasing emission of greenhouse gasses emerge that the importance of Mg alloys. Mg alloys can begin to supersede the steel and aluminum for structural applications, thanks to the developing of mechanical properties or corrosion resistance of these alloys. Rare earth metals such as Gd, Ce, Y and Nd have been utilized at AZ31 Mg alloys for this purpose in recent years. In this study, the effects of La addition and homogenization heat treatment on microstructure, hardness properties and corrosion resistance of AZ31 and modified AZ31 Mg alloys produced by low pressure die casting method were investigated. © 2017 Trans Tech Publications, Switzerland.Öğe Microstructure and corrosion properties of homogenized Mg-4Zn-1La magnesium alloy(Trans Tech Publications Ltd, 2017) Zengin, H.; Turen, Y.; Ahlatci, H.; Sun, Y.; Kara, I.H.In this study, microstructure and corrosion behaviour of homogenized Mg-4Zn-1La magnesium alloy was investigated. Mg-4Zn-1La alloy was produced by low-pressure die casting method. Homogenization treatments were performed at 350 °C and 400 °C for 12, 18, 24 and 48 hours, followed by rapid cooling in water at room temperature. Microstructure characterizations showed that La addition led to a formation of semi-continuous network structure and islands of second phases which identified as T-phase (Mg7Zn3RE). A significant amount of second phase dissolution and an increase in-Mg grain size with increasing both homogenization time and temperature was observed. Homogenization treatment led to an improvement in corrosion resistance of Mg-4Zn-1La alloy. Homogenization at 400 °C resulted in better corrosion resistance than homogenization at 350 °C for all homogenization duration. © 2017 Trans Tech Publications, Switzerland.Öğe Preparing Eco-friendly Composite from End-life Tires and Epoxy Resin and Examining Its Mechanical, and Acoustic Insulation Properties(Universiti Malaysia Perlis, 2024) Abdulhameed, J.I.; Ali, A.H.; Kara, I.H.; Mahan, H.M.; Konovalov, S.V.; Al-Nedawi, N.M.The recycling of the enormous number of used tires that are discarded annually after the end of their service is a high-priority issue in order to conserve the environment and reduce the raw material costs of products, particularly in cases where high strength requirements are not necessary. In this study, crumbed tire rubber (CTR) was used as a filler with different weight fractions (10%, 20%, 30%, and 40%) to prepare CTR/epoxy composites. Mechanical, thermal, and acoustic insulation properties were tested to gather sufficient data on the development of these properties with increasing CTR content. The results indicate a decline in mechanical properties with increasing CTR content. The composite with 40 wt. % CTR showed a decrease in hardness, tensile strength, and flexural strength compared to neat epoxy by 75%, 70%, and 75% respectively. Additionally, the thermal conductivity of this composite was 36.3% higher than that of epoxy. Finally, the acoustic insulation test for the composite with a 40% CTR weight fraction showed improved sound insulation over a wide range of applied frequencies (0-10000) Hz. © 2024, Universiti Malaysia Perlis. All rights reserved.Öğe Sliding wear behavior of chromium boride coated AISI 52100 steel(Politecnico di Torino (DIMEAS), 2013) Sen, U.; Aydin, F.; Kara, I.H.; Sen, S.[No abstract available]Öğe Thermophysical characteristic of nano-TiO2 paraffin wax composite material(Bangladesh University of Engineering and Technology, 2021) Mahdi, M.T.; Kara, I.H.In modern applications, energy storage and transmission is considered important, and in particular for photovoltaic thermal (PV/T) applications. phase change materials is considered one of the important developments used in these applications because they possess superior thermophysical properties and thus have a high storage of energy capacity within the shape of latent heat. However, Low thermal conductivity is one of the most important problems facing the widespread use of these materials. In this work, Nano titanium oxide (TiO2) is added to the paraffin wax to evaluate the thermophysical changes occur in the wax. Therefore, the most appropriate materials to be used in (PV/T) applications can be determined. Five samples were prepared with the addition of Nano-titanium oxide with a percent mass ratio (0, 0.5, 1, 2, and 3). The results showed that adding any percentage of Nano Tio2 increases its viscosity and density. Since when 3% nano-TiO2 is added, the viscosity and density of the paraffin wax increases by 9.5%, 5.5%, respectively. The thermal conductivity is improved to 28.94%, 58.42%, 77.9%, and 91.57% for 0.5, 1, 2, 3% mass fraction, respectively. In addition, adding (Nano - TiO2) to paraffin wax reduces its thermal decomposition, which improves thermal stability. © 2021 Zibeline International Publishing Sdn. Bhd.. All rights reserved.
