Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Gul, Muhammet(110)
- Güler, Ömer(70)
- Akkurt, Nevzat(69)
- Serdar, Osman(57)
- Yucesan, Melih(55)
- Celik, Erkan(53)
- Tekin, H.O.(52)
- ALMisned, Ghada(49)
- Bulut, Hasan(49)
- Baskonus, Haci Mehmet(48)
- Paksoy, Mehmet Yavuz(46)
- Yildirim, Numan(45)
- Kocabaş, Mehmet(41)
- Yildirim, Nuran Cikcikoglu(41)
- Zengin, Gokhan(40)
- Alataş, Mevlüt(39)
- Ince, Muharrem(38)
- Benzer, Fulya(37)
- Mete, Suleyman(34)
- Aslan, Naim(33)
- Kutlu, Banu(33)
- Yildirim, Ozal(33)
- Topal, Murat(32)
- Tanyol, Mehtap(30)
- Batan, Nevzat(28)
- Özkul, İskender(28)
- Kök, Mediha(27)
- Utku, Anıl(27)
- Can, Erkan(26)
- Danabas, Durali(26)
- Sulaiman, Tukur Abdulkadir(26)
- Ates, Mehmet(25)
- Ezer, Tülay(25)
- Guler, Omer(25)
- Kutluyer, Filiz(25)
- Say, Yakup(25)
- Serin, Faruk(25)
- Erguven, Gokhan Onder(24)
- Onat, Onur(24)
- Cakilcioglu, Ugur(23)
Yayınlar
- MakaleAçık Erişim2023Comparative Analysis of Composite Buildings Produced in National and International Standards
Etli, Serkan; Akgül, Melek
Composite moment resisting frame buildings with 5-, 10-, 15- and 20-story concrete filled steel tube columns and composite beams were modelled. The buildings are designed according to Turkish Code for Design and Construction of Steel Structures-2016 (TCDCSS-2016) and Türkiye Building Earthquake Code-2018 (TBEC-2018) regulations at high ductility levels. The design of the DCH structures was designed in ZC ground for a 0.79 g PGA. While choosing the design location, it is assumed that the construction will be made in a region between the North Anatolian fault line and the East Anatolian fault line, that is, in a region with high earthquake risk. Within the scope of the study, SeismoStruct [1] software was used during the design and performance evaluation of the structures. Nonlinear static push and incremental dynamic analyses were used. Uniform and triangular load distributions were adopted in the PO analysis, and 16 earthquake ground motions were used in the dynamic analysis. The effect of story number on the seismic behavior of CMRFs was investigated using nonlinear analysis results. Accordingly, variation in lateral response, overstrength factors, ductility, and section capacity change of members for CMRF structures were presented. In addition, a mutual evaluation was made with the performance parameters obtained from previous studies with similar geometries.
AtıfOpenAlex3TR Dizin2
İncele - MakaleAçık Erişim2023Application of a new dynamic analysis method to pid controlled speed governors in hydroelectric power plants
Işık, Erdem; Kahraman, Gökhan
Hydroelectric power plants are environmental-friendly as they are renewable energy sources and make great contributions to the economies. In addition, they are in the state of insurance of the electricity network, since they can respond to the power demands of the electricity network in a very short time. In this study, the effect of the speed governors dispense valve has been added to the classical control mechanism in order to accurately predict the reaction of hydroelectric power plants to the load requirement of the electrical network. As a result of the dynamic analysis, the data obtained in the simulation environment have been compared with the responses of the real hydraulic turbine. The results show that when the dynamic analysis of the speed governor dispense valve is added to the classical control mechanism, the power response behavior in the simulation environment becomes closer to the real hydraulic turbine behavior. These results will assist speed governor designers in predicting real-like behavior in hydroelectric power plants.
- MakaleAçık Erişim2023Doğurgan Çağdaki Kadınlarda Travmatik Doğum Algısı ve Etkileyen Faktörler
Taşçı Beydağ, Kerime Derya; Dal, Nursel Alp
Amaç: Bu araştırma, doğurgan çağdaki kadınlarda travmatik doğum algısı düzeyini ve etkileyen faktörlerin belirlenmesi amacıyla yapılmıştır. Yöntem: Tanımlayıcı ve kesitsel tipteki çalışmaya, Türkiye’de yaşayan ve çalışmaya katılmayı kabul eden ve gebe olmayan 1090 kadın, kartopu örnekleme yöntemi ile 1 Ekim- 31 Kasım 2020 tarihleri arasında alınmıştır. Çalışmanın verileri sosyal paylaşım sitesi ve sosyal paylaşım ağı üzerinden çevirim içi anket ile toplanmıştır. Veriler, ilgili literatür doğrultusunda hazırlanmış olan demografik soru formu ve Travmatik Doğum Algısı Ölçeği (TDAÖ) ile elde edilmiştir. Bulgular: Kadınların TDAÖ puan ortalaması 63.78±30.04 bulunmuştur. Kadınların, gelir düzeyi, medeni durum, çalışma durumu, yaşadıkları yer, doğum yapma durumu, doğumdan korkma durumu, annesinin doğum hikâyesinin nasıl olduğu, kötü doğum hikâyesi duyma durumu, vajinal ve sezaryen doğuma tanık olma durumlarının travmatik doğum algısını etkilediği tespit edilmiştir. Sonuç: Kadınların orta düzeyde travmatik doğum algısına sahip oldukları saptanmıştır. Sağlık profesyonellerinin birincil amacı travmatik doğumların oluşması önlenmek olmalıdır. Eğer travmatik doğum önlenememişse kadının bu süreci sorunsuz anlatabilmesi için destek olunmalı ve doğum sonu bakımla olumsuz doğum algısı olumluya dönüştürülmelidir.
AtıfOpenAlex2İncele - MakaleAçık Erişim2023Updated Checklist of Turkish Bryophyte Vegetation
Alataş, Mevlüt; Batan, Nevzat; Erata, Hüseyin; Ezer, Tülay
In this study, we present a current list of syntaxa belonging to the bryophyte vegetation of Türkiye. This checklist was compiled from the national and local literature, and includes all syntaxonomic units of bryophyte vegetation that have been newly described or reported for Türkiye to date. To date, 56 associations and 29 sub-associations belonging to 21 alliances, 14 orders, and 9 classes have been reported in Türkiye, bryosociologically. In addition, 26 phytosociological units were determined as unknown status. In the present study, syntaxonomical units were grouped according to their habitat type (aquatic, terrestrial, saxicolous, or epiphytic) and were given with their localities and synonyms.
AtıfOpenAlex4TR Dizin2İncele - MakaleAçık Erişim2023Ebelik Bölümü Öğrencilerinin Ötenaziye Karşı Tutumlarının Dini Tutumları ile İlişkisi: Türkiye’de Kesitsel Bir Çalışma
Koç, Özlem; Baltacı, Nazlı; Yüksekol, Özlem Doğan; Polat, Habibe
Amaç: Bu araştırma, ebelik öğrencilerinin ötenaziye yönelik tutumları ile dini tutumları arasındaki ilişkiyi belirlemek amacıyla yapıldı. Yöntem: Kesitsel nitelikte yapılan bu araştırmanın evrenini, Türkiye'nin doğusunda bir üniversitenin ebelik bölümünde öğrenim gören öğrenciler oluşturmuştur. Araştırma, Kasım-Aralık 2021 tarihleri arasında 284 gönüllü ebelik öğrencisi ile gerçekleştirildi. Verilerin değerlendirilmesinde frekans, yüzde, ortalama ve standart sapma değerleri gibi tanımlayıcı istatistikler kullanıldı. Normal dağılım gösteren değişkenler için bağımsız örneklem t testi ve tek yönlü varyans analizi (ANOVA), normal dağılım göstermeyen değişkenler için Spearman korelasyon analizi kullanıldı. Araştırma verileri Google form ile toplandı. Katılımcıların, araştırmaya katılmak isteyip istemediklerini teyit etmek için Google formu ile kendilerine bir onam sorusu soruldu. Bulgular: Katılımcıların Sağlık Profesyoneli Ötenazi Tutum Ölçeği (SP-ÖTÖ) toplam puanı 83.04±16.07 olarak bulunurken, Ok-Dini Tutum Ölçeği (Ok-DTÖ) toplam puanı 34.01±6.00 olarak belirlendi. Puan ortalamalarına göre, katılımcıların ötenaziyi desteklemeye yönelik tutumları orta düzeydeyken, dini tutumları olumluydu. Sonuç: Bu çalışma sonucunda öğrencilerin çoğunun ötenaziye yönelik olumsuz tutumlara sahip olduğu ve bu tutumları etkileyen faktörlerden birinin de dini inanç olduğu görüldü.
AtıfOpenAlex4TR Dizin1İncele - MakaleAçık Erişim2023The effect of ohmic heating on the quality properties of couscous during cooking
Sabanci, Serdal; Işık, Erdem; Goksu, Ali; Omaç, Basrı
Couscous has been widely eaten around the world because it has a low glycemic index, is low in fat, and is simple to prepare. However, it should be cooked before consumption. Therefore, novel heating methods, such as ohmic heating, can be used to cook couscous. This study aimed to investigate the potential use of ohmic heating at a voltage gradient of 17 V/cm to cook couscous and compare it with the conventional cooking method. To determine the effect of ohmic heating and conventional methods on the quality properties (color, texture profile analysis, cooking loss, moisture content, and weight increase (%)) of couscous, samples were cooked in a 0.1% salt solution. The samples were analyzed at different cooking times (4, 8, 12, and 16 min). The results obtained in the present study revealed that the total color difference also increased with an increase in cooking time. In addition, similar trends were observed for cooking loss, moisture content, and weight gain. Furthermore, the couscous samples treated with ohmic heating and conventional heating methods were completely cooked after 12 minutes. Overall, compared to the conventional cooking method, the ohmic heating process did not induce any negative effects on the quality parameters of couscous.
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2023The Tiny Pleurocarpous Moss Platydictya jungermannioides (Brid.) H. A. Crum in Türkiye
Alataş, Mevlüt; Batan, Nevzat; Uygur, Ahmet; Ezer, Tülay; Keskin, Ali; Aslan, Züleyha; Çulha, Harun
In this study, Platydictya jungermannioides, a rare moss species, was recorded for the second time from Türkiye and reported for the third time from Southwest Asia. The present study provides a detailed description of the species, collected from the Bolkar Mountains, along with photographs. Additionally, the ecology and distribution of Platydictya jungermannioides in Türkiye are discussed.
AtıfOpenAlex2TR Dizin1İncele - MakaleAçık Erişim2023Investigation of the Effects of Ghrelin and Kisspeptin Levels in Liver Tissue of Rats Fed with High Fructose Diet -A Histological Study
Özay, Yusuf; Güler, Osman; Türk, Ahmet; Karadag, Abdullah; Zencirci, Büşra
Purpose: High fructose corn syrup (HFCS) is used commonly in the food industry and has been associated with various diseases including obesity, diabetes and fatty liver. Ghrelin, an orexigenic hormone with widespread receptors in many tissues, exerts various central and peripheral effects. Food intake may reduce its synthesis. Kisspeptin plays a major role in reproductive hormones and its receptors are expressed in tissues with high metabolic activity, such as the liver. This study aims to investigate the effects of HFCS consumption on liver tissue and its relationship with Kisspeptin and Ghrelin levels. Materials and Methods: Fourteen adult male Wistar albino rats, aged eight to ten weeks, were used in this study and divided into two groups; Control and HFCS (n=7). Tumor Necrosis Factor-alpha (TNF-α), Ghrelin, and Kisspeptin levels in the liver tissues of the rats were measured using an immunohistochemical method and subsequently analyzed through histoscoring. Results: Our data revealed a significant increase in Kisspeptin, Caspase 3, and TNF-α levels and a decrease in Ghrelin levels in the HFCS group compared to the Control group. Conclusion: In conclusion, our study demonstrates, for the first time, changes in liver Kisspeptin levels induced by a high fructose diet. Furthermore, the consumption of HFCS in food led to inflammatory activation, tissue damage, and reduced Ghrelin levels.
- MakaleAçık Erişim2023The Antioxidant Capacities and Antimicrobial Activities of Some Salvia L. Seeds
Ökkeş; Yılmaz, Okkes; Yilmaz; Kurşat, Murat; Kirbag, Sevda; Civelek, Şemsettin; Emre, Irfan; Sönmez, Pınar Erecevıt; Emre, Mustafa Yunus
The goal of present study is to find the penolic contents, antioxidant activities and antimicrobial capacities in the seeds of five Salvia L. taxa two of which are endemics (Salvia euphratica var. leiocalycina and Salvia euphratica var. euphratica). The flavonoid and phenolic acid are determined by using HPLC while the antioxidant activities are determined based on different methods. Also, the antimicrobial activities of some Salvia species are determined by using the well agar method. The current study found that the studied Salvia species have low flavonoid. It has been found that Salvia euphratica var. euphratica has high vanillic acid, ferulic acid and rosmarinic acid among the studied taxa. Similarly, it has been found that Salvia euphratica var. euphratica has high DPPH and ABTS radical scavening capacity in all concentrations. It has been also found that Salvia euphratica var. euphratica has highest total phenolic content (372,63±0,87 µgGAE/mg) whilst Salvia tricholoda has low total phenolic content (46,41±1,71 µgGAE/mg). In addition, this study demonstrated that Salvia tricholoda has lowest metal chelating activity (37,35±0,51%). Furthermore, present study found that the lipid peroxidation levels of the studied Salvia taxa are between 18,21±0,37 mg/kg and 21,03±0,22 mg/kg while it has been found that the antibacterial properties of the Salvia taxa under study are altering.
AtıfOpenAlex1TR Dizin1İncele - MakaleAçık Erişim2023Experimental investigation and numeric modelling of the impact performance of basalt fiber reinforced geopolymer concrete
Polat, Berivan Yılmazer; Güngör, Hiranur
Geopolymer concrete (GC) has been found to have better results than Portland cement concrete (PCC), including lower carbon dioxide emissions, higher compressive strength, and greater durability. The study aims to determine the effects of basalt fiber on GC due to the impact caused by the sudden loading effect. Samples were prepared with different mixing ratios for the experimental process, with PCC used as the control sample. Basalt fibers were added to the samples in three different ratios based on optimal mixing ratios determined through physical and mechanical tests, such as UPV (Ultrasonic Pulse Velocity), compressive strength, and flexural strength. Subsequently, fibrous samples were analyzed using SEM (scanning electron microscopy) and EDS (energy dispersive spectroscopy). A drop-weight experiment was conducted on GC plates measuring 50×50×5 cm, which contained two different fiber ratios that yielded the best mechanical and physical properties. The results were analyzed using numerical modeling methods. No changes in content were made. The sample with the highest impact resistance was found to be the 2% basalt fiber-reinforced GC, with a displacement value 21.21% lower than PCC. The language used is clear, concise, and objective, with a formal register and precise word choice. The text follows a logical structure with causal connections between statements and adheres to conventional academic formatting and citation styles. The ANSYS modeling results indicated an 89.63% similarity with the experimental data regarding the displacement values. Additionally, the study demonstrated that the inclusion of basalt fiber additives enhances the impact resistance of geopolymer concrete. Furthermore, numerical modeling can predict the impact behavior of concrete to a significant extent, eliminating the need for experimental processes.
- MakaleAçık Erişim2023Systematic Literature Review and Scientific Maps on Ecological Architecture and Eco-Architecture
Dal, Murat; Burkut, Emine Banu
The purpose of this article is to examine systematic literature reviews and scientific maps on the subjects of Ecological architecture, eco-architecture, and ecological architectural design. The method of this research is bibliometric analysis, one of the quantitative research methods. The data of the research are publications in the Scopus database between 2000 and 2023. For the analysis, graphics from the Scopus database and the Biblioshiny software program were used. Research findings offer a comprehensive overview of theories, concepts, trends, and publications in the field of ecological architecture, eco-architecture, and ecological architectural design. Additionally, the concepts that stand out in the publications are ecology, sustainable architecture architectural design, environment, green building, design, energy efficiency, architecture design, green architecture, experimental simulation, sustainable design, landscape, nature, sustainable design, thermal design, architectural education, climate change, construction, ecological architecture design. The significance of this research lies in its provision of a conceptual foundation for future studies in the intersection of ecology and architecture. For future research, it is recommended to conduct studies using various databases such as Web of Science, ProQuest Dissertations & Theses Global, etc., at different intervals over the years.
AtıfOpenAlex7TR Dizin2İncele - MakaleAçık Erişim2023Numerical Analysis of Double Geopolymer Concrete Layer with Different Properties
Polat, Berivan Yılmazer
Researchers have been working to find alternatives to conventionally produced concrete in recent years. Geopolymer concretes are also the focus of these studies. There are not enough studies on modelling geopolymer concretes, which are the subject of many experimental studies. In this study, which is believed to close the gap in the literature, stress and strain analyses of geopolymer concrete with two different properties under load in two different systems were performed. The locations of the concrete with different properties were also changed in the model, and the results obtained in both cases were compared. It was observed that when the geopolymer concrete with a lower modulus of elasticity and 100% slag content was on top, the stress values decreased, and the strain rates increased.
- MakaleAçık Erişim2023Analysis of Publications on Earthquake Research in Architecture Category and Analysis with R Studio-Biblioshiny Software
Dal, Murat; Burkut, Emine Banu; Karataş, Lale
The purpose of this research is to examine the publications focusing on earthquakes in the category of architecture (web of science). The data of the research was analyzed with the Biblioshiny software program. This software program makes a bibliometric analysis on which topics and concepts earthquake research focuses. In addition, images and frequencies of publications related to architecture and earthquakes were revealed. The data of the research was collected between 1-15 July 2023. Results for Architecture (WoS Categories) AND earthquake* (Topic) OR earthquake AND architecture (Topic) OR earthquake AND house (Topic) OR earthquake AND structure (Topic) OR earthquake AND damage (Topic) OR earthquake AND city (Topic) OR earthquake AND urban (Topic) and Türkiye (Countries/Regions). Data were collected with keywords in the Web of Science database. According to the research findings, there are 1033 publications and in the country/region category (Türkiye), 83 publications are accessed. The most used words in the publications are earthquake, urban transformation, Istanbul, seismic, retrofit, assessment, structural, urban, damage, buildings and performance.
AtıfOpenAlex6TR Dizin1İncele - MakaleAçık Erişim2023A Graphical Ontology-Based Method for Rapid Damage Assessment of Stone Cultural Heritage Structures After an Earthquake: A Case Study of Mor Petrus and Mor Paulus Church, Adıyaman/Türkiye
Dal, Murat; Karataş, Lale
To prevent further damage to historical structures and elements after an earthquake, it is important to implement temporary interventions that aim to stabilize and support the affected area. Within this scope, it is crucial to promptly identify the areas in historical buildings that require urgent intervention. The aim of this study is to design a standardized assessment method that provides an objective evaluation for post-earthquake damage detection in stone cultural heritage structures, independent of subjective assessments, and can be easily and quickly implemented in the field. For the proposed method, the heavily damaged Mor Petrus and Mor Pavlus Church in Adıyaman, which was affected by the 2023 earthquakes centered in Kahramanmaraş, is used as a case analysis. The results of the study demonstrate that the presented method is beneficial for detecting damages in masonry church structures after an earthquake. The graphical ontology-based method followed in the study allows for the identification of damages at the level of structural elements and focuses on areas with urgent damage.
AtıfOpenAlex2TR Dizin2İncele - MakaleAçık Erişim2023Determination and monitoring of tetracycline and degradation products in livestock slaughterhouse wastewater treatment plant effluent
Topal, Murat; Topal, E.Işıl Arslan; Öbek, Erdal
Aim of our study was the determination and monitoring of tetracycline (TC) and degradation products (DEP) in livestock slaughterhouse wastewater treatment plant (SWWTP) effluent. For this purpose, TC and DEP values in SWWTP were investigated. The concentrations of TC and DEP were monitored for 12 months. TC, 4-epitetracycline (ETC), 4-epianhydrotetracycline (EATC), anhydrotetracycline (ATC), and physicochemical parameters of pH, suspended solids (SS), BOD5, COD, and TP were calculated. The maximum TC concentration was determined as 1.68±0.08 µg/L in March and the minimum TC was 1.08±0.05 µg/L in January. The maximum ETC was 2.93±0.14 µg/L in March and April. The minimum ETC was 1.98±0.1 µg/L in January. EATC was 10.82±0.5 µg/L in September, and minimum EATC value was determined as 9.14±0.4 µg/L in March. The maximum ATC value was 8.62±0.4 µg/L in June and the lowest ATC value was 6.61±0.3 µg/L in September. Concentrations of TC and DEP detected in SWWTP effluent were listed in descending order as EATC> ATC> ETC> TC.
AtıfOpenAlex1İncele - MakaleAçık Erişim2023Application of the Ohmic Heating Process to Make a Semolina Dessert with Milk
Sabanci, Serdal; Omaç, Basrı; Yüksel, Hatice Pınar
Traditional milk desserts are one of the most essential dessert groups that Turkish society consumes. Due to foaming activity, it was aimed to investigate the feasibility of the ohmic heating system to produce a semolina dessert with milk. Hence, an ohmic heating treatment was used to heat the milk, semolina, and sugar mix from 20°C to 100°C using three different voltage gradients (15, 17.5, and 20 V/cm) and then boil for two minutes. It was found that the current value escalated from 20°C to approximately 86°C but decreased after 86°C due to foaming. Since the total consumed energy during the ohmic cooking treatment was inversely proportional to the treatment time, the total consumed energy values decreased based on the rising voltage gradient. As a result, the feasibility of the ohmic heating treatment for making a traditional semolina dessert with milk was determined in this study.
- MakaleAçık Erişim2023Bioremediation of Synthetic Prepared Domestic Wastewater with P. chrysosporium
Erguven, Gokhan Onder; Yildirim, Nuran Cikcikoglu; Aydin, Ekrem; Ergül, Gözde
In this study, the removal efficiencies were evaluated based on key environmental parameters such as chemical oxygen demand (COD), Total Organic Carbon (TOC), Total Nitrogen (TN), and Total Phosphorus (TP), using P. chrysosporium white rot fungus to treat synthetically prepared domestic wastewater. The research aimed to assess the suitability of bioremediation results with respect to the Urban Wastewater Treatment Regulation. The experiment was carried out over a span of 11th days, employing static 1/1 and 1/5, as well as dynamic 1/1 and 1/5 dilution ratios. The outcomes revealed varying removal efficiencies, with the highest rates observed at dynamic conditions and a 1/5 dilution ratio: 84% for COD, 81% for TOC, 73% for TN, and 56% for TP. Conversely, the lowest removal efficiencies were determined under static 1/1 conditions, reaching 48% for COD, 33% for TOC, 31% for TN, and 45% for TP. Based on the results, it is evident that P. chrysosporium exhibited effective bioremediation capabilities on synthetic domestic wastewater within a reasonable 11th day period. Furthermore, the results aligned with the specified limit values outlined in the Urban Wastewater Treatment Regulation. Consequently, the study highlights the efficacy of P. chrysosporium as a valuable species for biological treatment stages in urban wastewater management
- MakaleAçık Erişim2023The Mediating Role of Motivation to Teach in Burnout Levels and Attitudes toward the Teaching Profession of Prospective Teachers
Dikmen, Melih; Karakaya, Yunus Emre; Şahin, Aykut
This study aims to reveal the relationship between burnout levels, attitudes toward the teaching profession, and motivation to teach in prospective physical education and sports teaching. Accordingly, the mediating role of motivation to teach in the relationship between burnout levels and attitudes toward the teaching profession of prospective teachers was investigated. The data of the study were collected online from 685 prospective teachers who studied in the field of sports education in 12 state universities in Turkey. The data were collected by using “Burnout,” Attitudes toward Teaching Profession,” and “Motivation to Teach” scales. Path analyses were conducted to test the direct prediction power of burnout and motivation to teach on the attitudes toward the teaching profession and the indirect prediction power of burnout on attitudes toward the teaching profession through motivation to teach. In conclusion, it was determined that burnout negatively predicted attitude toward the teaching profession and motivation to teach in a significant way, while motivation to teach predicted attitude toward the teaching profession positively in a significant way. Furthermore, it was determined that the negative effect of burnout on the attitude toward the teaching profession was reduced by the mediating role of motivation to teach.
AtıfOpenAlex6TR Dizin2İncele - MakaleAçık Erişim2023The Effects of Hydroxyapatite on the Corrosion Behaviour of AZ Series Mg Alloys
Say, Yakup
Metallic biomaterials are widely used in the orthopedic and dental applications owing to their advanced biocompatibility and sophisticated mechanical properties. Many studies are carried out to develop new alloys with high specific strength, high corrosion resistance and high biocompatibility as an alternative to present metallic biomaterials. Mg alloys are potential alloys as a biomaterial, especially because they have low density and high biocompatibility. However, especially the corrosion properties of Mg alloys need to be improved. In this study, the surfaces of AZ31, AZ61 and AZ91 alloys, which are promising as biomaterials, were coated with hydroxyapatite with high biocompatibility, and the effects of the bioceramics coatings on corrosion resistance were comprehensively investigated. Crack-free and porous surface morphologies were obtained in all bioceramic coatings and the presence of the coatings on the surfaces was supported by EDS analysis. As a result of the corrosion tests performed in SBF, it was determined that the AZ91 alloy had the highest corrosion resistance among the uncoated samples. The hydroxyapatite bioceramic coatings also improved the corrosion properties of all samples. However, among all samples, the highest corrosion resistance was obtained in the hydroxyapatite coated AZ91 alloy.
AtıfOpenAlex2İncele - MakaleAçık Erişim2023Novel Quaternary CuAlZnMg High Temperature Shape Memory Alloy (HTSMA) Fabricated by Minor Batch of Zn and Mg Additions
Özkul, İskender; Boyrazli, Mustafa; Aksu Canbay, Canan; Başbağ, Güneş; Karaduman, Oktay
Shape memory alloys (SMAs) constitute the second largest commercial smart material class after piezoelectric materials. Different SMA alloy systems or SMAs with miscellaneous functionalities and characteristic properties have been designed for using in different applications until today. High temperature shape memory alloys (HTSMAs) are also widely desired to be used in various smart materials applications. HTSMAs with different functional and characteristic properties are muchly demanded for different tasks to be done by these alloys or devices designed by these alloys. A common and practical way to fabricate SMAs or HTSMAs with different shape memory effect (SME) and other properties is to fabricate them with different alloying compositions and add different additive elements. In this work, a quaternary CuAlZnMg HTSMA with an unprecedented composition consisting minor amount of zinc and magnesium additives was produced by arc melting method. As a result of applying post-homogenization in high β–phase temperature region and immediate quenching, the microstructural mechanism of a SME property was formed in the produced alloy. After then, to examine SME characteristics of the CuAlZnMg alloy some differential thermal analysis (DTA), microstructural (XRD) and magnetization (VSM) characterization tests were carried out. The DTA results showed that the alloy is a HTSMA exhibiting reverse martensitic transformations at temperature range between 167 °C and 489 °C. The XRD pattern obtained at room temperature revealed the martensite phases formed in the alloy, which phases are the base mechanism of the reversible martensitic transformation (the SME property) of the alloy. The VSM test showed that the alloy exhibit a diamagnetic property with a weak ferromagnetic coercivity contribution.