Papers by Yildirim Aydogdu
Journal of Thermal Analysis and Calorimetry
Bookmarks Related papers MentionsView impact
Eksploatacja i Niezawodność – Maintenance and Reliability
The choice of reactor structural material design must take into account the TOKAMAK fusion reacto... more The choice of reactor structural material design must take into account the TOKAMAK fusion reactors' structural reliability. Due to their high levels of heat and energy, fusion reactions have significant deformation effects, which reduce the efficiency of energy production in reactors. Material selection, erosion and damage, heat and stress management, reliability analysis, maintenance, and inspection are crucial elements in determining how reliable fusion reactors are. The focus of this work is on material selection and reliability analysis based on these parameters. The most common wall materials used in fusion reactors are tungsten, beryllium, steel, or graphite. It is advised to utilize aluminum because harmful Beryllium dust limits the study of this element. For this purpose, a target of aluminum samples is established with a plasma of He ions created by glow discharge. The dependability of the samples is determined by calculating the Weibull Distribution and measuring the ...
Bookmarks Related papers MentionsView impact
Eksploatacja i Niezawodność – Maintenance and Reliability
The choice of reactor structural material design must take into account the TOKAMAK fusion reacto... more The choice of reactor structural material design must take into account the TOKAMAK fusion reactors' structural reliability. Due to their high levels of heat and energy, fusion reactions have significant deformation effects, which reduce the efficiency of energy production in reactors. Material selection, erosion and damage, heat and stress management, reliability analysis, maintenance, and inspection are crucial elements in determining how reliable fusion reactors are. The focus of this work is on material selection and reliability analysis based on these parameters. The most common wall materials used in fusion reactors are tungsten, beryllium, steel, or graphite. It is advised to utilize aluminum because harmful Beryllium dust limits the study of this element. For this purpose, a target of aluminum samples is established with a plasma of He ions created by glow discharge. The dependability of the samples is determined by calculating the Weibull Distribution and measuring the ...
Bookmarks Related papers MentionsView impact
Food and Bioprocess Technology
Bookmarks Related papers MentionsView impact
Iranian Journal of Science and Technology, Transactions A: Science, 2020
Bookmarks Related papers MentionsView impact
Intermetallics, 2019
Bookmarks Related papers MentionsView impact
Applied Physics A, 2016
Bookmarks Related papers MentionsView impact
Journal of Thermal Analysis and Calorimetry, 2016
Bookmarks Related papers MentionsView impact
Materials Today: Proceedings, 2015
Martensitic structures, transformation behavior and some magnetic properties of a new series of M... more Martensitic structures, transformation behavior and some magnetic properties of a new series of Mn49Ni42-xFexSn9 (x = 0 – 4 at.%) metamagnetic shape memory alloys have been studied as a function of Fe content and magnetic field. Fe doping decreased sharply the martensitic transformation temperatures. The XRD patterns showed different phases including orthorhombic structure, the L21 cubic phase and the fcc γ-phase at room temperature depending on Fe content. The magnetization curves, M-H, exhibited obvious metamagnetic transitions.
Bookmarks Related papers MentionsView impact
Journal of Superconductivity and Novel Magnetism, 2010
Bookmarks Related papers MentionsView impact
Materials Research Express, 2020
The aim of the study was to obtain a smart textile material with shape memory alloys. NiMn-based ... more The aim of the study was to obtain a smart textile material with shape memory alloys. NiMn-based shape memory alloy was produced by arc melting system for this purpose. Phase transition temperatures of the fabricated alloy were determined by using differential scanning calorimeter (DSC). The crystallographic structure of the fabricated alloy was characterized by x-ray diffractometer (XRD). The fabricated shape memory alloy was converted to the particle form and filled into polymer matrix to obtain shape memory effect of this polymeric composite material. Polymeric composites (PCs) were produced in film form and shape training of PCs were studied under different conditions. The shape memory behavior of samples was investigated into the water for fast response during applying heat. Damping capacity of composites was measured by using dynamic mechanical analyzer (DMA) according to temperature rising. The shape recovery was observed under certain stimuli on the SMA filled polymeric comp...
Bookmarks Related papers MentionsView impact
Bu calismanin amaci, CuAlCr yuksek sicaklik sekil hatirlamali alasimin ozelliklerinin yaslandirma... more Bu calismanin amaci, CuAlCr yuksek sicaklik sekil hatirlamali alasimin ozelliklerinin yaslandirma ile gelistirmektir. Bu amac cercevesinde, CuAlCr alasimina farkli zamanlar ve farkli sicakliklar icin yaslandirma uyguladik. Secilen yaslandirma sicakliklari 500 ve 700 o C ve zaman araligi bir, iki, uc ve dort saattir. 500 o C yaslandirma sicakligi icin donusum sicakligi gorulmemistir. Buna gore, Bu yaslandirma sicakliginin uygun olmadigi soylenebilir. 700 o C yaslandirma sicakligi icin, alasim donusum sicakligi gostermektedir ve donusum sicakligi degeri artan yaslandirma zamaniyla artmaktadir. Donusum sicakligi pik degeri, 350 o C ve 431 o C sicakligi araliginda degismektedir. CuAlCr alasiminin X isinlari olcumleri de yapilmistir. Alasimin kristal yapisinda herhangi bir degisi gorulmezken, x isinlari pik siddetinin artan yaslandirma zamaniyla arttigi gorulmustur.
Bookmarks Related papers MentionsView impact
Journal of Applied Polymer Science, 2018
Bookmarks Related papers MentionsView impact
Journal of Materials Processing Technology, 2002
Bookmarks Related papers MentionsView impact
Journal of Materials Processing Technology, 2004
... alloys exhibit superelasticity in a temperature range depending on the alloying elements and ... more ... alloys exhibit superelasticity in a temperature range depending on the alloying elements and ... The martensitic transformation and the associated mechanical shape reversibility in copper-based shape ... Ageing of martensite in as-quenched CuAlNi alloys can result in loss of ...
Bookmarks Related papers MentionsView impact
Physics of Metals and Metallography, 2022
In this study, the Ni30Ti50Ta20, Ni30Ti50Ag20 and Ni29Ti50Nb21 shape memory alloys SMAs were prod... more In this study, the Ni30Ti50Ta20, Ni30Ti50Ag20 and Ni29Ti50Nb21 shape memory alloys SMAs were produced through the arc-melting method under a high vacuum. The thermal properties and antimicrobial potential for these alloys were investigated. The thermal properties were determined by DSC at different heating rates. According to the DSC results, the austenite phase transformation temperature of Ni30Ti50Ta20 alloy is higher than Ni30Ti50Ag20 and Ni29Ti50Nb21 alloys. The thermal activation energy calculated by Kissinger and Ozawa methods were found as follows: Ea = 156.138 kJ/mol and Ea = 154.37 kJ/mol for Ni30Ti50Ta20 alloy, Ea = 124 kJ/mol and Ea = 123.74 kJ/mol for Ni30Ti50Ag20 alloy, and Ea = 89.43 kJ/mol and Ea = 90.6 kJ/mol for Ni29Ti50Nb21 alloy, respectively. In this study each of alloys exhibited a very strong antifungal ability. When compared by the antibacterial activities; the Ni30Ti50Ta20 alloy was showed higher activity than Ni30Ti50Ag20 and Ni29Ti50Nb21 alloys. It was seen from the Vickers hardness results of the samples that Ni30Ti50Ta20 SMA has the highest value. Optical microscope images of the alloys were taken at three different temperatures. Martesite plates were not found in any of the alloys. In addition, no structural changes were observed with the temperature difference. Based on the obtained results, it is suggested that the alloys have a high potential for biomedical applications to prevent bacterial based infections.
Bookmarks Related papers MentionsView impact
Materials Research Express, 2019
This study presents the heat treatment effect on a quaternary Cu79Al13Ni4Ta4 (wt%) shape memory a... more This study presents the heat treatment effect on a quaternary Cu79Al13Ni4Ta4 (wt%) shape memory alloy. The induction technique was used for melting the alloy and then four pieces of the alloy were heat-treated at (673 K, 873 K, 1073 K, and 1273 K) for one hour. Some physical parameters were characterized using DSC, XRD, and SEM-EDX. The as-cast and heat-treated samples were studied in terms of phase transformation temperatures, enthalpy change, entropy change, Gibbs free energy, and elastic energy. The transformation temperature was increased by applying heat treatment. Martensitic phase transformation at heat treatment temperature of 1273 K was not observed. Besides, after rising heat treatment temperature, some new phases such as ϒ 1 ′ and β 1 ′ were specified in XRD patterns and SEM images. Generally, for heat-treated samples, the transformation temperature remains almost constant after the 3rd cycle. However, the thermal stability of the as-cast alloy was not affected through th...
Bookmarks Related papers MentionsView impact
Surface Review and Letters, 2021
The development of NiTi-based shape memory alloys (SMAs) for some medical applications has been l... more The development of NiTi-based shape memory alloys (SMAs) for some medical applications has been limited by releasing Ni element into the organic tissue. In this study, Ni[Formula: see text]Ti[Formula: see text]Sn3-wire (at.%) SMA was produced using the arc-melting technique, and the alloy was subjected to non-isothermal processes. Some characteristics of the alloys, such as oxidation behavior, corrosivity, and in vitro study in simulated body fluid and physiological solution at body temperature, were investigated. The corrosion rate of the as-casted alloy was lower than the equiatomic-NiTi alloy found in the literature. The estimated ICP-MS results showed that the release of alloying constituents into the solutions is in accordance with the standards.
Bookmarks Related papers MentionsView impact
Synthetic Metals, 2001
ABSTRACT Molecular semiconducting complexes constitute one of the most fascinating, recent resear... more ABSTRACT Molecular semiconducting complexes constitute one of the most fascinating, recent research topics, deeply involving both chemists and solid states physicists. Considerable interest has been shown in the synthesis and study of molecular complexes which may behave like semiconducting materials or at least show high conductivities. In this study, structural, electrical and thermal conductivity and optical properties of some inorganic complexes were investigated. From the XRD data, the unit cells of the samples were found as L–Cu is amorphous and L–Ni, L–Co are orthorhombic. L–Cu, L–Ni and L–Co have n-type of electrical conductivity. Electrical and optical band gaps of the complexes were found to be 1.46–1.36, 2.68–2.71 and 1.40–1.32 eV, respectively.
Bookmarks Related papers MentionsView impact
Hastaliklarin tani ve tedavisinde tibbi goruntuleme cok onemli bir yer olusturmaktadir. Tibbi Gor... more Hastaliklarin tani ve tedavisinde tibbi goruntuleme cok onemli bir yer olusturmaktadir. Tibbi Goruntuleme, en basit hali ile insan vucudunun ic yapisinin cesitli yontemler ile gorulebilir hale getirilmesidir. Tum bu tani ve tedavi amacli kullanilan cihazlarin bir kismi iyonizan radyasyon icermektedir. Radyasyon iceren cihazlari tanimak ve bilgi sahibi olmak hem hasta hem de saglik personelleri acisindan oldukca onemlidir. Bu calisma, Radyolojik incelemelerde kullanilan baslica cihazlari tanitmak amaciyla hazirlanmistir.
Bookmarks Related papers MentionsView impact
Uploads
Papers by Yildirim Aydogdu