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    Corrosion behavior of heat treated Mg-xZn (x=0.5 – 3) alloys
    (MIM RESEARCH GROUP, 2019) Koç, E.; Makhlof, F.M.S.
    The purpose of this study is to investigate the effects of zinc (0,5-1-2-3 wt.%) additions and heat treatment parameters on the microstructure, hardness and corrosion properties of magnesium zinc alloys. After the solution heat treatment at 400?C, the samples subjected to 8 and 16 hours heat treatment. Microstructure studies showed that the grain size decreased with the increase of Zn content and the MgZn intermetallic phase was formed by the addition of 3 wt.% Zn. Hardness of the samples was increased with increase of Zn content before and after heat treatment. For the as-cast samples, as the amount of Zn increased, corrosion current density (Icorr) and corrosion rate (Pi) increased. As the amount of Zn increased, Icorr and Pi values decreased after 8 hours and 16 hours of heat treatment respectively. It can be suggested that in the galvanic couple of Mg-3Zn, ?-Mg matrix phase behaves as an anode and MgZn intermetallic phase behaves as a cathode. © 2019 MIM Research Group. All rights reserved.
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    Design and Simulation of a Biocompatible Prosthesis Ti-15Mo-XTa Alloy: An Analysis of Mechanical Integrity Using Finite Element Modeling
    (Springer Science and Business Media Deutschland GmbH, 2024) Saud, A.N.; Majdi, H.S.; Koç, E.; Al, Maamori, M.
    The main focus of this work is the development and simulation of a prosthesis using a high entropy alloy known as Ti-15Mo-XTa. The selection of this alloy is based on its compatibility with the human body, which is a crucial factor when choosing materials for medical implants. Traditional metal implants can cause several problems for patients, including toxic reactions from the release of metal ions, wear and tear of joint replacements from movement, and structural failure from repetitive loading. To address these concerns, the present study creates a three-dimensional finite element model of the prosthesis using COMSOL software. The model includes both isotropic and anisotropic materials and is subjected to various mechanical loads based on experimental studies. The finite element method is used to analyze the distribution of stress and strain across adjacent elements of the prosthesis. By simulating the behavior of the prosthesis under different loading conditions, valuable insights into its performance and durability can be gained. To assess the static design, the prosthesis is tested using COMSOL simulation software and subjected to loading conditions of 70, 90 and 110 kg. The objective of this assessment is to determine the robustness and ability of the design to withstand real-world mechanical demands. By conducting these simulations and tests, the researchers hope to contribute to the development of improved prostheses that can offer better functionality, longevity and overall patient satisfaction. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.
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    Effect of Weld Currents on Microstructure, Corrosion Behavior of AZ31 Magnesium Alloy
    (Springer Science and Business Media Deutschland GmbH, 2021) Demir, B.; Koç, E.; Saud, A.N.
    Resistance spot welding (RSW) of magnesium alloys is very attractive due to not require filler metal. AZ31 Mg alloy sheets were exposed to RSW by constant weld electrode pressure, constant weld times, and numerous weld currents. The potentiodynamic polarization technique was used for the investigation of the corrosion behavior of the alloys. Results showed that the dendritic structure was promoted at the weld zone. AZ31 base metal is more resistant to corrosion than welded alloys. However, when compared with each other, icorr values of the welded alloys decrease as a function of weld current increases. The corrosion rate was predominantly influenced by the distribution of intermetallic and alloying elements, and RSW weld varied, which was in response to altering the joint microstructure. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG part of Springer Nature.