Profile URL: https://hdl.handle.net/20.500.13091/11584
Job Title:Arş. Gör. Uzm.
Email Address:abayatli@ktun.edu.tr
Main Affiliation:02.11. Department of Metallurgical and Materials Engineering
Status: Current Staff
ORCID:
0000-0002-1808-4295
0000-0002-1808-4295Scopus ID:
58089734800
58089734800YÖK Akademik: 6B3B101EBFD6CD0D
Google Scholar:
CGVyRX4AAAAJ
CGVyRX4AAAAJWeb of Science ID:
JRX-2445-2023
JRX-2445-2023Name Variants:
Bayatli, Aleyna
10 results
Scholarly Output Search Results
Now showing 1 - 10 of 10
Article Citation - WoS: 20Citation - Scopus: 21Understanding Corrosion Morphology of Duplex Stainless Steel Wire in Chloride Electrolyte(Mdpi, 2021-07-07) Ornek, Cem; Davut, Kemal; Kocabas, Mustafa; Bayatli, Aleyna; Urgen, MustafaThe corrosion morphology in grade 2205 duplex stainless steel wire was studied to understand the nature of pitting and the causes of the ferrite phase's selective corrosion in acidic (pH 3) NaCl solutions at 60 degrees C. It is shown that the corrosion mechanism is always pitting, which either manifests lacy cover perforation or densely arrayed selective cavities developing selectively on the ferrite phase. Pits with a lacy metal cover form in concentrated chloride solutions, whereas the ferrite phase's selective corrosion develops in diluted electrolytes, showing dependency on the chloride-ion concentration. The pit perforation is probabilistic and occurs on both austenite and ferrite grains. The lacy metal covers collapse in concentrated solutions but remain intact in diluted electrolytes. The collapse of the lacy metal cover happens due to hydrogen embrittlement. Pit evolution is deterministic and occurs selectively in the ferrite phase in light chloride solutions.Article Konya Gevale Kalesi Kazılarında Bulunan Temrenlerin Arkeometalurjik İncelemeleri(2024-05-21) Aygör, Erkan; Bayatlı, Aleyna; Kocabas, MustafaTürkiye’de Orta Çağ kazılarında çıkarılan ve Orta Çağ’a ait temrenler üzerine çalışmalar oldukça sınırlıdır. Özellikle Orta Çağ’da, temrenlerin bilinmeyen yönleri bulunmaktadır. Bu bilinmeyenlerin ortaya çıkarılması için arkeometalurji çalışmaları günümüzde daha çok önem kazanmaktadır. Temrenlerde, diğer arkeolojik kazı buluntularında olduğu gibi etrafında bulunan diğer eserlerin varlığına veya katmanlarına göre dönem tespiti yapılmaktadır, ancak yaş tespiti dönemin üretim ve şekillendirme işlemleri hakkında bilgi vermemektedir. Bu anlamda, bu çalışmada Konya Gevale Kalesi bölgesinde bulunan temrenler arkeometalurjik yöntemlerle incelenmiştir. Konya Gevale Kalesi civarında bulunan temrenlerin farklı tipolojiye sahip olduğu ve temrenlerin tipolojisiyle kullanım amacı arasında bir ilişki olduğu gözlemlenmiştir. On üç yıllık kazılar sonrasında bulunan temrenler arasından i) yassı ve ii) dörtgen geometriye sahip iki farklı temren seçilerek analizleri yapılmıştır. Elde edilen kimyasal ve mikroyapısal analizler sonucunda temrenlerin ait olduğu dönemin üretim ve şekillendirme yöntemleri hakkında bilgi sahibi olunmuştur. Temrenlerin yüzey ve mikroyapı incelemelerinde taramalı elektron mikroskobu (SEM) ile elementel analiz spektroskopisi (EDS) ve optik mikroskop kullanılmıştır. Temrenlerin faz yapısı x-ışını kırınım (XRD) yöntemiyle incelenmiştir. Yapılan incelemelerle, o dönemin sahip olduğu teknoloji nedeniyle üretim ve şekillendirme için daha çok yumuşak çelik grubu kullanılmıştır. Aynı zamanda üretim sırasında izabe işlemlerinin yeterli ölçüde yapılamadığını ve bu nedenle çelik içerisinde istenmeyen elementlerin mevcudiyeti de gözlemlenmiştir. Öte yandan temren üretiminde genellikle döküm ve dövme yöntemlerinin kullanıldığı görülmüştür. Temrenler, uzun yıllar boyunca toprak altında kaldığı için bulundukları ortamla etkileşime girerek homojen bir şekilde korozyona uğramıştır. Ancak bulundukları ve maruz kaldıkları ortamda zaman içerisinde meydana gelen değişimler nedeniyle iç katmanlara doğru farklı korozyon ürünleri oluşumu söz konusudur.Article Citation - WoS: 32Citation - Scopus: 33A General Review on the Thiospinels and Their Energy Applications(ELSEVIER SCI LTD, 2021-09-01) Özel, F.; Kılıç, H. S.; Coşkun, H.; Deveci, I.; Sarılmaz, A.; Balıkçıoğlu, A.; Ersöz, M.; Kuş, MahmutMaterial science is one of the decisive tools toward engineering versatile compounds for numerous technological applications. Over the last decades, thiospinels have been attracting great interest because of their unique characteristics and potential utilizations offering innovative and interesting features. The characteristics of these transition metal sulfides play a key role in many different applications and make thiospinels an essential class of material. To the best of our knowledge, this work, for the first time, summarizes broadband studies on thiospinels reported in the literature. The scope of this review covers all synthesis methods applied over, the chemical and physical properties, and the clean energy applications of thiospinels, which have achieved tremendous significance. It underlined and proposed the challenges and future perspectives based on sulfur-based ternary compounds. Moreover, this review draws attention to the current and future research needs of thiospinel materials to improve and broaden their applications and thus commercialization. (C) 2021 Elsevier Ltd. All rights reserved.Article Citation - WoS: 23Citation - Scopus: 24Effect of In-Situ Formed Oxide and Carbide Phases on Microstructure and Corrosion Behavior of Zr/Y Doped Cocrfeni High Entropy Alloys Prepared by Mechanical Alloying and Spark Plasma Sintering(Elsevier Sci Ltd, 2023-11-01) Kotan, Hasan; Tekin, Mustafa; Bayatlı, Aleyna; Bayrak, Kübra Gürcan; Kocabaş, Mustafa; Ayaş, ErhanThe present work has examined the microstructural evolution, thermal stability, hardness, and corrosion behavior of Zr/Y doped CoCrFeNi HEAs prepared through high-energy mechanical alloying followed by spark plasma sintering (SPS) at 1100 degrees C. The achieved microstructures were investigated by XRD and TEM techniques. The results showed that investigated HEAs consist of an fcc solid solution of CoCrFeNi matrix with in-situ formed Cr-C carbides and Cr/Zr/Y based oxide phases. The SPS processing of CoCrFeNi yielded grain growth to 370 & PLUSMN; 60 nm, while 240 & PLUSMN; 160 nm grain size with bimodal grain size distribution and 165 & PLUSMN; 38 nm grain size were achieved with Zr and Y additions, respectively. The effects of microstructural changes on the hardness and corrosion behaviors of HEAs were also investigated. Compared with 372 & PLUSMN; 15 HV hardness of CoCrFeNi HEA, 445 & PLUSMN; 26 HV and 563 & PLUSMN; 58 HV hardness values were determined with Zr and Y doped HEAs, respectively. The increase in hardness is mainly ascribed to the precipitation strengthening of carbide and oxide phases as well as smaller grain sizes. The corrosion analysis showed that, although the achieved smaller grain sizes and the presence of different oxide types when dopped with Y and Zr impaired the corrosion resistance, the investigated HEAs have reasonable resistance to corrosion when compared to SS304 stainless steel.Article Structural, Wear and Corrosion Properties of Nitrided, PVD and Electroless Ni-B Coated EN-GJS-700-2 Cast Iron(Springer, 2026-05-12) Yildirim, Mehmet; Ünalsan, Emre; Yildirim, Ozlem Altintas; Altintas Yildirim, Ozlem; Bayatlı, AleynaThe structural properties, surface hardness, wear and corrosion behaviors of plasma- and gas-nitrided, PVD TiN coated and electroless Ni-B coated EN-GJS-700-2 (GGG-70) grade ductile cast iron (DI) were investigated in detail. The structural properties were examined with an optical microscope, a scanning electron microscope and x-ray diffraction. The surface hardness was tested with Vickers microhardness tests; the wear behavior was investigated by ball-on-flat linear reciprocating abrasion/friction tests and the corrosion behavior was studied by electrochemical tests. The 1.95 & micro;m PVD TiN coating had the hardest surface hardness with 2782 HV0.001 value. All nitrided and coated specimens exhibited better wear and corrosion resistance than the DI-substrate. The PVD TiN coating demonstrated the best wear resistance with the lowest wear loss (0.231x10(-3) mm(3)) and the lowest friction coefficient value (0.16). Corrosion tests revealed that electroless Ni-B-coated specimens (0.002 mm/year corrosion rate) and nitrided specimens (0.002 mm/year for plasma- and 0.076 mm/year corrosion rate for gas-nitrided) showed excellent corrosion resistance, while the PVD TiN-coated specimen (0.673 mm/year corrosion rate) showed moderate corrosion protection0020.Article Citation - WoS: 18Citation - Scopus: 21Effect of Boron Carbide Reinforcement on Surface Properties of Electroless Ni-B and Ni-B Coatings(Elsevier Science Sa, 2023-09-01) Bayatlı, Aleyna; Sahin, Emine Feraye; Kocabaş, MustafaToday, composite coating of nickel-boron with an electroless method is considered as an innovative, attractive, and trend topic. It is known that the hardness and tribological properties of electroless nickel-boron (EN-B) coating can be improved with co-deposition of ceramic particles. In this study, boron carbide (B4C) was added to binary (Ni-B) and ternary (Ni-B-W) EN-B coatings: (i) Ni-B-B4C, and (ii) Ni-B-W-B4C. Surface morphology, phase structure, tribological characteristics, and electrochemical behaviors for all coatings were investigated and compared. The surface morphology of composite coatings was transformed from cauliflower to cloudy-shaped with the addition of B4C particles. Characteristic amorphous structure with some degree of crystallinity was obtained at all types of coatings. Experimental test results revealed that the boron carbide particles provide a noticeable enhancement in hardness. The hardnesses of composite coatings were improved by approximately 52% in Ni-B-B4C and 62% in Ni-B-W-B4C compared to EN-B coatings. Boron carbide reinforcement and poly-alloying with tungsten caused an increase of hardness at Ni-B from 673 HV0.025 up to around 1096 HV0.025 (Ni-B-W-B4C) which is a noticeable increase in hardness. With boron carbide addition binary and ternary coatings wear factors showed a discernible diminishment by several times. Besides, electrochemical analyses indicated a minimal decrease in the corrosion resistance of composite coatings compared to that of Ni-B and Ni-B-W coatings.Article Innovative Hybrid Coatings: Uniting Boron Carbide and Graphite for Enhanced Performance in Electroless Nickel Boron Coating Process(Elsevier Science Sa, 2025-07-01) Bayatli, Aleyna; Kilic, Fatih; Kocabas, MustafaIn this study, two different powders were harmonized to develop electroless nickel-boron coatings with enhanced hardness and wear resistance. For this purpose, a new hybrid electroless nickel boron composite coating process was developed by using two different characteristic particles which are i) boron carbide and ii) graphite. The surface analysis showed that harmonizing two particles into one single coating bath exhibited good tribological and mechanical properties as compared to conventional single-particle composite and non-composite electroless nickel boron coatings. After the coating process, two different heat treatment procedures were carried out which are i) 250 degrees C-5 hours and ii) 400 degrees C-1 hour. Chemical composition, crystal structures, microhardness, tribological, and corrosion behaviors of the coatings were investigated. The comprehensive results showed the dual effect of different particles which have different characteristics lubricious and abrasive on hardness and tribological properties. The heat treatment process had also a positive effect on the tribological behavior of the hybrid composite coatings. Microhardness values of the hybrid composite coating improved by around 24-37% compared to electroless nickel boron coating alone whereas heat treatment processes led to an increment in hardness of around 50-87%. Besides it was observed that wear rates were 79-93% lower than classic nickel boron coating while heat treatment also decreased the wear rate by 154-165%. The corrosion resistance of the hybrid coating is similar to electroless nickel boron coating however it decreases slightly after the heat treatment process. Overall, the hybrid electroless nickel boron composites were successfully achieved and provide promising features for the coating employed in industrial applications.Other Understanding Corrosion Morphology of Duplex Stainless Steel Wire in Chloride Electrolyte(2021) Örnek, Cem; Davut, Kemal; Kocabaş, Mustafa; Ürgen, Mustafa; Bayatlı, AleynaThe corrosion morphology in grade 2205 duplex stainless steel wire has been studied to understand the nature of pitting and the causes of the ferrite phase's selective corrosion in acidic NaCl solution. It is shown that the corrosion mechanism is always pitting, which either manifests lacy cover perforation or densely-arrayed selective cavities developing on the ferrite phase. Pits with a lacy metal cover form in concentrated chloride solutions, whereas the ferrite phase's selective corrosion develops in diluted electrolytes, showing dependency on the chloride-ion concentration. The pit perforation is probabilistic and occurs on both austenite and ferrite grains. The lacy metal covers collapse in concentrated solutions but remain intact in diluted electrolytes. The collapse of the lacy metal cover happens due to hydrogen embrittlement. Pit evolution is deterministic and occurs selectively in the ferrite phase in light chloride solutions.Master Thesis Elektrolitik Krom Kaplamada Organik Katalizör İlavesinin ve Akım Yoğunluğunun Kaplama Özelliklerine Etkilerinin İncelenmesi(Konya Teknik Üniversitesi, 2022) Bayatlı, Aleyna; Kocabaş, Mustafa; Örnek, CemElektrolitik krom kaplama, yüksek sertliği ve aşınma direnci, düşük sürtünme katsayısı, yüksek ergime sıcaklığı ve iyi korozyon direnci gibi üstün özellikleri nedeniyle endüstriyel uygulamalarda yaygın bir şekilde kullanılmaktadır. Bu cezbedici özelliklere sahip olmasının yanı sıra krom kaplamanın özellikleri banyo bileşimi, kaplama ekipmanları ve kaplama parametrelerine karşı oldukça hassastır. Bu durum istenilen özelliklere sahip kaplamanın elde edilebilmesi için her bir parametrenin optimize edilmesini zorunlu kılmaktadır. Bu tez çalışmasında St37 çeliği üzerine akım yoğunluğu ve organik katalizör ilavesine bağlı olarak dört farklı koşulda krom kaplama işlemi uygulanmıştır. Kaplanmış numunelerin yüzey morfolojisi, korozyon özellikleri, aşınma ve yapışma dirençleri, sertlik değişimleri ve faz yapıları karakterize edilerek karşılaştırmalar yapılmıştır. Buna ek olarak organik katalizör ilavesinin endüstriyel krom kaplama işlemlerinde sıklıkla karşılaşılan problemlerden biri olan çukur (pit) hatasının oluşumu üzerine olan etkileri de incelenmiştir. Artan akım yoğunluğu ve organik katalizör ilavesi sonucunda kaplama kalınlığı artışıyla beraber daha sert, aşınmaya ve çizilmeye daha dirençli bir kaplama elde edilmiştir. Ancak artan kaplama kalınlığı mikro çatlak oluşumunu arttırıcı bir etki yaptığı için korozyon direncinde olumsuz yönde değişimler meydana gelmiştir. Öte yandan organik katalizör ilavesinin çukur hatası oluşumunu arttırıcı yönde bir mekanizmaya sahip olduğu görülmüştür. Çalışma sonunda kaplamadan beklenen özelliklerin elde edilebilmesi için banyo ve ekipman özelliklerinin sıkı bir optimizasyonu beraberinde getirdiği, değişen her bir parametrenin bazı özellikler üzerinde iyileştirici etki sağlarken diğer özelliklerin olumsuz etkilediği sonucuna ulaşılmıştır.Article Citation - WoS: 1Citation - Scopus: 1Effect of Organic Catalyst Addition on Pitting Evolution at Hard Chromium Plating(Springer, 2023-02-03) Bayatlı, Aleyna; Kocabas, MustafaElectrolytic hard chromium plating has been extensively used in commercial and military applications to impart enhanced wear and corrosion resistance to steel. However, a common problem on the surface of hard chromium plating is pitting defects which typically reduce mechanical properties and the visual appearance of the plating. While there are many factors that influence pitting in hard chromium plating, the use of a secondary catalyst is one of the major contributors. In the present study, two different chromium layers were plated on commercial St37 steel using two different mixed-catalyst baths at 55 +/- 1 degrees C: (i) an electrolyte CrO3/H2SO4 solution with 30 g/L as a commercial organic catalyst and (ii) CrO3/H2SO4 solution without any organic catalyst. The organic catalyst increased the throwing power of chromium and caused the formation of pit defects, trapped bubbles, and microcracks without affecting the plating-substrate interface bonding. The trapped bubbles were readily visible to the unaided eye after chromium plating, and they transformed into hemispherical pits at the end of the post-plating finishing treatment. The results of this study show that plating parameters and organic catalyst additives need to be carefully controlled in order to minimize pitting in hard chromium coatings.
Research Topics
Domains
Physical Sciences
Fields
Materials ScienceEngineeringEnergy
Subfields
Materials ChemistryElectrical and Electronic EngineeringRenewable Energy, Sustainability and the EnvironmentMechanics of MaterialsMetals and Alloys
Specific Research Areas
Corrosion Behavior and Inhibition
Electrodeposition and Electroless Coatings
Electrocatalysts for Energy Conversion
Metal and Thin Film Mechanics
Hydrogen embrittlement and corrosion behaviors in metals
Sustainable Development Goals
7AFFORDABLE AND CLEAN ENERGY
1
Research Products
9INDUSTRY, INNOVATION AND INFRASTRUCTURE
1
Research Products
Documents
6
Citations
88
h-index
3
Documents
6
Citations
82
Publication Collaboration
| Affiliation Name | Count |
|---|---|
| Konya Technical University | 8 |
| Atilim University | 2 |
| Istanbul Technical University | 2 |
| Selçuk University | 1 |
| Ankara University | 1 |
1 / 3
Data obtained from OpenAlex
| Journal | Count |
|---|---|
| Materials Chemistry and Physics | 2 |
| Intermetallics | 1 |
| Journal of Materials Engineering and Performance | 1 |
| Journal Of Materials Engineering And Performance | 1 |
| MATERIALS TODAY ENERGY | 1 |
Current Page: 1 / 2
Scholarly Output
10
Articles
8
Views / Downloads
30/120
Supervised MSc Theses
1
Supervised PhD Theses
0
WoS Citation Count
94
Scopus Citation Count
100
Patents
0
Projects
0
WoS Citations per Publication
9.40
Scopus Citations per Publication
10.00
Open Access Source
4
Supervised Theses
1
Scopus Quartile Distribution
Competency Cloud
