Ridvan Yamanoğlu

Ridvan Yamanoğlu
Kocaeli University · Department of Metallurgical and Materials Engineering

PhD

About

82
Publications
29,156
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446
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Introduction
Now, I am working on titanium based biomaterials, layered materials, pressure assisted sintering techniques, designing new atomization techniques, sintering of Fe, Ni, Co, Al, Mg, Cu based powders YOU CAN APPLY FOR OUR MASTER AND PHD PROGRAMMES
Additional affiliations
December 2002 - present
Kocaeli University
Position
  • Professor (Assistant)

Publications

Publications (82)
Conference Paper
Endüstriyel uygulamalarda sürtünme koşullarında malzemelerin korunması için babit alaşımları dikkat çekmektedir. Özellikle yatak malzemelerine babit alaşımlarının kaplanması ile malzemelerin kullanım ömürlerinin arttırılması amaçlanır. Genellikle babit alaşımları yatak malzemelerinin üzerine geleneksel döküm yöntemleri ile kaplanır. Bu çalışmada to...
Conference Paper
Full-text available
Research aiming at enhancing the functionality of biomedical materials has grown in recent years. These studies have increasingly begun to focus on metallic biomaterials. Due to their superior mechanical qualities, high levels of biocompatibility and corrosion resistance, Co-Cr alloys are among the most widely used metallic biomaterials. In additio...
Article
Al-Si-Mg alaşımlarında çökelti sertleşmesi yöntemi ile mukavemet artışı sağlanabilmektedir. Çökelti sertleşmesi prosesinde sıcaklık ve süre önemli bir parametredir. Su verme prosesi sonrasında, aşırı doymuş yapının belirli bir sıcaklıkta belli bir süre tutulması ile denge dışı çökeltiler oluşturularak mukavemet artışı sağlanmaktadır. Bu modelleme v...
Article
This study examined the effects of lignin used in EPDM elastomer composites in place of carbon black. For that purpose, lignin was added in amounts of 3.5, 7, and 10.5 phr to investigate the chemical, thermal, rheological, mechanical, and morphological properties of the EPDM elastomers. At the end of the study, tear strength and elongation were enh...
Article
Bearing materials are used in many industrial applications such as automotive, marine, aviation and hydroelectric power plants. Powder metallurgy is preferred because it is economically more advantageous in the production of this type of material. The main requirement in bearing materials is high tribological properties at a low cost. Therefore, th...
Article
Full-text available
In the present study, nickel matrix composites reinforced with in situ oxides were densified by the hot pressing process (HP). Mechanical alloying was used to synthesis in situ matrix and reinforced phases. The mechanical alloying process allows the ignition of aluminothermic reaction in the NiO/Al system. The formation of Ni-Al2O3 powder composite...
Conference Paper
Full-text available
Titanium-based materials are widely preferred among metallic biomaterials due to their superior biocompatibility, high specific strength, corrosion resistance and low modulus of elasticity. Despite these outstanding properties, a continuous increase is observed in the number of studies conducted to increase the biofunctional properties of titanium...
Article
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The biomedical material industry continues to grow worldwide for people to sustain their quality of life and related activities. The increase in the aging population and prosperity level are among the main reasons that the biomedical material industry growing rapidly. According to the characteristic properties of the region where implantation will...
Article
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Eklemeli imalat geleneksel malzeme üretim tekniklerine göre sahip olduğu birçok avantaj nedeniyle son yıllarda hızlı bir şekilde yaygınlaşmaktadır. Bu avantajlardan bazıları, kalıba gerek kalmadan üretime izin vermesi, gerektiği kadar hammadde kullanılması, kişiye özgü ürün üretimi ve stok maliyetlerinin azaltılmasıdır. ISO/ASTM 52900 standardına g...
Article
Full-text available
This study aims to improve the mechanical properties of a Ti–2Fe base alloy by adding W solute and performing hot extrusion at a high temperature (1000 °C). W was added at 0, 1, 2, and 3 wt% using the powder metallurgy route and homogenization heat treatment. The as-extruded materials predominantly consisted of α phase with different microstructure...
Article
Metallic biomaterials improve the life quality of the people. In particular, efforts to develop porous biomaterials are getting more attention recently. Among the metallic materials, titanium alloys are commonly preferred in biomedical application due to their excellent biocompatibility, high corrosion resistance and mechanical strength. Researches...
Article
Full-text available
This study aims to investigate the influence of adding a coating layer of austenitic stainless steel type 316L on Ti6Al4V alloy on corrosion behaviour. Samples of 316L, Ti6Al4V, and 316L on Ti6Al4V were prepared by hot-press sintering of their powders. The potentiodynamic polarization technique was used to characterize the corrosion behaviour of th...
Article
In the current study, the effect of Mo content (1-10 wt.%) on the microstructure, hardness, bending and wear properties of Ti6Al4V-xMo alloys was investigated. The pre-alloyed and Plasma Rotating Electrode Process (PREP) atomized Ti6Al4V alloy powders and elemental Mo particles were mechanically mixed for 45 min in a zirconia jar. A uniaxial vacuum...
Article
Thermomechanical processing and solid-solution strengthening are effective ways to improve the mechanical properties of Ti alloys with elements such as W and Fe. However, W is not completely soluble in the Ti-Fe matrix at room temperature, which can lead to phase segregation and low mechanical properties. Therefore, in this study, we present high-s...
Article
Titanium alloys have been widely used in many industrial applications. Nevertheless, efforts to improve their properties are continually increasing. One of the most effective routes to improve strength, hardness and wear resistance is to create a coating layer on the substrates. In the current study, stainless steel was selected for the in-situ joi...
Article
Fully dense powder metallurgy (PM) Ti–4Fe–0.2O–3Cu–0.4Si alloy was produced employing spark plasma sintering (SPS) and hot extrusion aiming to develop an inexpensive high strength dual-phase (α+β) Ti alloy. The microstructure consisted of globularized fine grain α phase dispersed in the β matrix having the sharp texture of <101‾0>//extrusion direct...
Article
Research related to the substitution of ubiquitous elements for high-cost rare elements during the fabrication of high-performance Ti alloys has attracted significant attention. The microstructure evolution is, however, challenging when several elements with different properties are used. The aim of this research is This research aims to study the...
Article
Full-text available
In the current study, Ti5Ag alloy was produced by powder metallurgical techniques and its mechanical and biological properties were carried out. Pure Ti and Ag particles were mechanically mixed in a ball mill and then sintered by uniaxial hot pressing. Sintering was conducted simultaneously at 950 oC and 50 MPa pressure for 30 minutes. Sintering pr...
Article
Full-text available
In the world market, medical products emerge as a sector that directly concerns people's life quality and related activities. The medical product industry continues to grow rapidly in the world, especially in developed countries in line with the advances in technology, along with the elderly population and welfare level. In this context, biomedical...
Conference Paper
Full-text available
The use of silver (Ag) and copper (Cu), known as antique metals as biocidal agents dates back to the beginning of the recorded history. It is known that these metals have been used for the treatment of many health problems including wounds and burns formed on the human body, brain infections, ulcers, toxaemia, venereal diseases, epilepsy and eye di...
Conference Paper
Full-text available
In today’s world, due to developing technologies and improvements in welfare, a dramatic increase can be observed in people’s quality of life and average lifespan. The elderly population exceeds the number of young ones, especially in developed countries, and health issues like obesity cause the functions to deteriorate in time and require surgerie...
Article
The demand for using high-performance Cu matrix composites in the electronic industry has recently increased rapidly owing to the low strength and tribological properties of pure copper. Accordingly, research and development of composite processing and related properties have increased. In this study, the Cu matrix was reinforced with different amo...
Conference Paper
Full-text available
Additive manufacturing methods have gained a great interest in recent years due to their many advantages. In this field, especially the rapid development of metal additive manufacturing technologies has expanded their usage in automotive, aerospace, defence industry, health and jewellery sectors. The production of high-strength parts without the ne...
Article
A homogeneous network distribution of molybdenum particles among pure titanium particles was successfully produced by powder metallurgy. The Ti–xMo mixtures were consolidated by uniaxial hot pressing under a 10−4 mbar vacuum atmosphere at 950 °C for 30 min. The distribution of the molybdenum particles in the structure was investigated by optical an...
Article
Full-text available
In this research, the effect of Ag on the mechanical properties of Ti5Al2.5Fe alloy has been investigated. The Ti5Al2.5Fe alloy, with different amounts of Ag ranged from 1 to 5 wt. % was prepared by mechanical mixing and then fabricated by hot pressing at 950 oC for 15 min under 50 MPa. Three holding steps were applied to the powder compacts to res...
Conference Paper
Full-text available
Son yıllarda teknolojinin hızla ilerlemesiyle, eklemeli imalat yöntemlerinin kullanımları hızla artmaktadır. Yıllarca ürün geliştirme ve prototip amaçlı kullanılan eklemeli imalat teknolojileri, günümüzde özellikle az adetli ve kişiye özel uygulamalarda konvansiyonel imalat teknolojilerinin yerini almıştır. Eklemeli metal imalat teknolojilerinde ür...
Conference Paper
Full-text available
The production of titanium based materials by additive manufacturing techniques has attracted much attention in recent years. In this study, Ti6Al4V alloy were produced by selective laser melting technique. Production parameters for additive manufacturing; diameter of laser 100 µm, laser power of 180 W, scan speed of 6 m/s, layer thickness of 0.03...
Conference Paper
With the rapid advancement of technologies in recent years, the use of additive manufacturing methods is increasing rapidly. Additive manufacturing technologies, which have been used for product development and prototyping for years, have replaced by conventional manufacturing technologies especially small and personalized applications. The quality...
Article
Full-text available
Titanium alloys and stainless steel type 316Lare used in biomedical applications due to their high corrosion resistance and good biocompatibility properties. In this study, a functionally graded material composed of titanium and stainless steel was fabricated using a powder metallurgical technique. Ti6Al4V alloy powder was placed as a substrate int...
Conference Paper
Full-text available
Despite its good mechanical properties and high corrosion resistance, the use of Ti6AI4V alloy is limited due to its low wear resistance. In this study, the Ti6Al4V alloy was coated with a nickel alloy powder, consisting elements Ni-Cr-Si-Fe-B-C, under 10-4 bar pressure. All powders, with identified thicknesses for each layer, were sintered at 950...
Article
Full-text available
Bu çalışmada saf alüminyum (Al) matris içerisine ağırlıkça % 0.25, 0.5 ve 1 oranlarında nano silisyum karbür partikülleri ilave edilmiş ve ardından toz karışımları önce mekanik alaşımlama, daha sonra sıcak pres ile sinterleme işlemine tabi tutulmuştur. Sinterleme sonrasında elde edilen numuneler metalografik işlemler ile hazırlanıp aşınma ve eğilme...
Conference Paper
Paslanmaz çelikler, sahip oldukları yüksek korozyon dirençleri ve biyouyumluluk özellikleri nedeniyle biyomedikal malzeme olarak oldukça yaygın bir şekilde kullanım alanı bulmaktadırlar. Paslanmaz çelikler genellikle döküm yöntemleri ile üretilmektedir. Bu çalışmada AISI 316L paslanmaz çeliği toz metalurjik yöntemler ile üretilmiştir. Paslanmaz 316...
Conference Paper
Full-text available
Magnezyum ve alaşımlarının zayıf mekanik ve korozyon özellikleri nedeniyle endüstriyel uygulamalarda kullanım alanı oldukça kısıtlıdır. Bu çalışmada Mg50Al50 intermetalik partikülleri ilave edilerek magnezyumun mekanik ve korozyon özelliklerinin geliştirilmesi amaçlanmıştır. Mg50Al50, Mg-Al faz diyagramında Mg17Al12 intermetalik bölgesine denk gelm...
Conference Paper
Full-text available
Titanyum esaslı malzemelerin özellikleri alaşım elementlerin mikroyapı üzerindeki oluşturduğu farklılıklar üzerinden kontrol edilir. Yüksek korozyon direnci ve beta stabilizer etkisi nedeniyle son yıllarda özellikle molibden esaslı titanyum alaşımlarının üretimi üzerine çalışmalar artmıştır. Bu çalışmada elementel Ti, Al ve Mo tozları kullanılarak...
Conference Paper
In this study, 4140 steel powder with a particle size range of 100-125 μm was sintered by hot press under a vacuum atmosphere. Sintering process was performed at different temperatures (800, 900 and 1000 0C) for 5 minutes. 50 MPa pressure was applied to steel powders during the sintering process. In the case of sintering process at 1000 0C, graphid...
Article
Spark plasma sintering (SPS) has been an attractive technique for many researchers seeking to consolidate metals and ceramics. This technique’s high heating rates with the support of simultaneous applied pressure result in highly densified materials. One of the most important effects of a high heating rate is the limitation of grain growth, which r...
Article
Full-text available
Metallic or ceramic micro/nanoporous materials have attracted particular attention due to some interesting structural and functional properties. There exist a variety of methods for producing porous materials by which optimized features can be reached. Spark plasma sintering (SPS) is one of these new-emerging approaches. This technique is often com...
Conference Paper
Full-text available
Endüstriyel gelişmeler ile birlikte insanoğlunun beklentileri daha da artmaktadır. Bu beklentiler büyük ölçüde yeni malzemelerin dizaynı veya mevcut malzemelerin modifikasyonu ve geliştirilmesi üzerine olmaktadır. Havacılık, otomotiv, biyomalzeme ve kimya sektörü bu noktada dikkati çekmektedir. Bahsedilen bu endüstriyel alanlar için malzemelerden ü...
Conference Paper
Full-text available
Toz metalurjik malzemelerin endüstriyel uygulamalarda kullanımı her geçen gün artmaktadır. Uzay, havacılık, savunma, otomotiv ve biyomedikal endüstrisi başta olmak üzere birçok alanda kullanılan toz metal esaslı parçalar, diğer üretim yöntemleri ile üretilen malzemelere göre hem nihai ürüne yakın üretim imkânı ile hem de elde edilen malzemelerin üs...
Article
Full-text available
In this study, copper alloy matrix composites reinforced with tungsten carbide (WC) particles with the addition of different Ni contents (0, 3, 5, 7, and 10 wt.%) were prepared by the spontaneous infiltration process. Image analysis was used to quantify the microstructural parameters, such as the particle size and distribution, area fraction, binde...
Article
Full-text available
In this study, the mechanical, antibacterial properties and cell toxicity response of Ti-5Al2.5F alloy with different copper contents were investigated. The alloys were prepared by high-energy ball milling using elemental Ti, Al, Fe, and Cu powders and consolidated by a uniaxial vacuum hot press. Staphylococcus aureus strain ATCC 29213 and Escheric...
Article
Ti5Al2.5Fe alloys were fabricated by the spark plasma sintering (SPS) and hot pressing (HP) pressure-assisted sintering techniques from pre-alloyed powders with a particle size of about 200 μm. The powders were sintered at 850 °C for two different holding times (5 and 8 min) and heating rates (50 and 150°C min⁻¹) at 25 MPa. The maximum relative den...
Article
Full-text available
In this study, continuous casting process performed using AA1070 and AA6101 feedstock alloys for bare conductor manufacturing. Test samples were provided at breaking time in casting and wire driving processes. Analysis of wire defects and damages were analyzed using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) and cat...
Presentation
Engineers of Future International Student Symposium (EFIS), 15 - 17 June 2017, Zonguldak, Turkey
Article
Full-text available
In this study, Ti-5Al-2.5Fe alloy was prepared by powder metallurgy. The elemental titanium, aluminum, and iron powders were mechanically alloyed for 10 h in a vacuum atmosphere. A stainless steel jar and stainless steel balls were used for mechanical alloying. The alloyed powders were then sintered by vacuum hot pressing at 950 °C for a soaking ti...
Article
Full-text available
Atık nihai depolama alanları; tehlikeli atıklar için 1. sınıf depolama alanları, tehlikesiz atıklar için 2. sınıf depolama alanları ve inert atıklar için 3. sınıf depolama alanları olmak üzere 3 genel kategori altında toplanabilir. Bununla birlikte, tehlikeli atık yakma tesisi uçucu külleri (HWI-FA) 1. sınıf depolama alanlarına bile kabul edilmeyen...
Article
Porous Ti5Al2.5Fe alloy was successfully fabricated using the spark plasma sintering technique. Experiments were performed within a temperature range of between 750 and 850 °C. The microstructure, compression and biocompatibility properties of the porous samples were investigated. Sintered samples were immersed for different times in a simulated bo...
Data
Full-text available
Article
In the current study, hard facing nickel alloy powders were coated in situ on pure iron by uniaxial hot pressing under vacuum atmosphere to improve its hardness and wear properties. The nickel alloy powders were placed onto the iron powders within a graphite die and then sintered at 1000 °C under 40 MPa for 10 minutes. Hardness and wear properties...
Article
In the current study, hard facing nickel alloy powders were coated in situ on pure iron by uniaxial hot pressing under vacuum atmosphere to improve its hardness and wear properties. The nickel alloy powders were placed onto the iron powders within a graphite die and then sintered at 1000 °C under 40 MPa for 10 minutes. Hardness and wear properties...
Article
In this paper, the effect of nickel content on the mechanical properties of aluminum were investigated. High purity Al and Ni were melted in an induction furnace and cast into a metal mold. Microstructural characteristic and mechanical properties of the alloys were studied in detail. The addition of nickel to pure aluminum increased the tensile str...
Article
Full-text available
In the present study, pure magnesium was in situ coated with pre-alloyed Al-Cu-Mg alloy through hot pressing. The produced samples were characterized by means of hardness, wear properties and microstructure characterization. A ball-on-disk test was used to determine the dry sliding wear characteristics of the compacts. The results showed that the h...
Article
In this study, nickel alloy powders were consolidated by spark plasma sintering. Experiments were performed between 700 and 750°C temperature range under 50 MPa pressure with holding times from 5 to 10 min. In addition to these main spark plasma sintering parameters three different heating rates ranging from 100 to 235°C min-1 and two different par...
Article
Full-text available
In this study, dry sliding wear behavior and corrosion resistance of Al–Cu–SiC–xNi (x: 0, 0.5, 1, 1.5 wt.%) composites were investigated. Effect of nickel content on the microstructure and hardness of the alloys was also studied. Wear tests were conducted using a ball on disc wear test device. Corrosion behavior of Al–Cu–SiC–xNi composite alloys in...
Article
Full-text available
In this study, a new metal matrix composite of aluminium was designed with the addition of nickel alloy particles. To produce in situ intermetallic formation, aluminium-nickel powder mixtures with different ratios ranging from 5 to 40 wt% Ni were consolidated at 550ºC for 15 minutes under 40 MPa pressure. The interlayer phase formed during sinterin...
Article
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In this study Al-Ni alloys with nickel contents between 1-5 wt.% were cast. Microstructures of the specimens were investigated under optical microscope and scanning electron microscope. Effect of nickel on hardness and wear resistance of aluminium was studied. Worn surfaces of the specimens were examined to understand the wear mechanism. Tensile te...
Conference Paper
In this study different amounts (up to 15 wt.%) of pure nickel powders were added to pure aluminum powders. The powders were mechanically mixed using a ball mill for 2 hours. Powder mixtures were sintered at 600 °C for 15 minutes in a hot press under vacuum. Microstructures and fracture surfaces of the specimens were investigated using a scanning e...
Conference Paper
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In this study, which was built in 1970, the formation of fatigue cracks on the surface of used rail steel and their mechanism of actions have been characterized. Fatigue cracks occur near the surface and there is no plastic deformation of the inner regions compared with microstructure changes and hardness profile measurements. The results showed th...
Article
Full-text available
In this study, aluminium-nickel alloys with different Ni ratios ranging from 1 to 5 wt-% were produced by casting method. The effect of nickel on the microstructure and hardness properties was studied. The dry sliding wear response of the Al-xNi alloys against steel and alumina counterfaces was investigated. Worn surfaces of the alloys were examine...
Article
Full-text available
In this paper, the erosive wear behaviour of Ti6Al4V alloy depending on various heat treatment conditions was evaluated. It is aimed to understand the relationship between the microstructure and the erosion rate of Ti6Al4V alloys. Furthermore, the hardness and the surface morphology variations depending on the annealing parameters and the effects o...
Article
Rapidly solidified micron sized 42CrMo4 steel powder with a size range of 150–250 μm produced by plasma rotating electrode process was consolidated using a recently developed spark plasma sintering (SPS) process. The relationship between sintering parameters (temperature and soaking time) and microstructural properties was investigated. The effect...
Article
In this study, the effect of heat treatment on the tribological properties of Al–Cu–Mg alloy reinforced with 4 wt.% SiC particles with 650 nm average particle size has been investigated. The age hardening process consists of solution treatment at 540 °C for 6 h, followed by water quenching and ageing at different temperatures of 175, 200 and 225 °C...
Article
Al4Cu2Ni2Mg alloy is an age-hardenable aluminum alloy. The effect of different solution and aging heat treatment conditions on the microstructure, hardness and wear resistance of the alloy was studied. The cast specimens were solution treated and then artificially aged. Optical microscopy and scanning electron microscopy were used to investigate th...
Article
Full-text available
In this study, the effect of heat treatment on the tribological properties of Al–Cu–Mg alloy reinforced with 4 wt.% SiC particles with 650 nm average particle size has been investigated. The age hardening process consists of solution treatment at 540 �C for 6 h, followed by water quenching and ageing at different temperatures of 175, 200 and 225 �C...
Article
In this study, aluminium–nickel alloys with different ratios ranging from 1 to 5 wt-% were produced by the casting method. The effect of nickel on the microstructure and hardness properties was studied. The dry sliding wear response of the Al–xNi alloys against steel and alumina counterfaces was investigated. Worn surfaces of the alloys were examin...
Article
In this paper, ZnO powder was consolidated by microwave and pressureless spark plasma sintering (PL-SPS) processes. Comparative experiments are undertaken maintaining conditions of green density, temperature profile and applied pressure. Densification and microstructural characteristics are determined under similar sintering parameters, where the f...
Article
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The aim of this study is to understand the effect of nickel addition on mechanical and wear properties of molybdenum and copper alloyed P/M steel. Specimens with three different nickel contents were pressed under 400 MPa and sintered at 1120 ºC for 30 minutes then rapidly cooled. Microstructures and mechanical properties (bending strength, hardness...
Article
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In this study, rapidly solidified metal matrix composite powders have been produced by PREP (Plasma rotating electrode process) atomization. AlCu4Mg1 alloy is used as the matrix material while SiC particles, with about 650 nm average particle size, are used as the reinforcement phase. The microstructural and solidification characteristics of compos...
Article
In this study different sized silver powders were produced by Plasma Rotating Electrode Process (PREP). Two different rotation speeds were used to obtain different powder median sizes. After production the powders were classified according to their size using a sieve analysis. The microstructures and morphologies of the powders were investigated us...
Article
In this study, tribological properties of vacuum hot pressed Al-Cu-Mg-SiC composite materials produced by powder metallurgy were investigated. The effect of hot pressing parameters on the microstructure, hardness and dry sliding properties were carried out. The results showed that sintering temperature, holding time, pressure and particle size had...
Article
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A microstructure characterisation of Ti–6Al–4V is conducted for cast, extruded and micrometre sized particles. The plasma rotating electrode process is used to produce spherical Ti–6Al–4V powders from an alloy electrode. The process parameters and their impact on the material properties are described. The effects of electrode rotation speed on the...
Article
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In the study for this contribution, good mechanical properties have been obtained from Mo (and Cu) alloyed PM-steels after suitable heat treatment. The influence of two to four weight percent nickel additions in these Mo (and Cu) alloyed PM-steels on the mechanical properties have been studied. The influence of such an alloying modification on the...