Hülya Durmuş

Manisa Celal Bayar University · Department of Metallurgical and Materials Eng.

Magnesium alloy, which draws attention with its lightness and high specific strength, is frequently preferred due to its advantages. However, it is necessary to improve the wear and corrosion properties in order to develop the areas of use in the automotive, aircraft, and space industries. For this purpose, after the surface preparation of the main...

Titanium alloys are preferred in many engineering applications due to their high specific strength and superior corrosion resistance. However, its abrasion resistance is not very high and it limits the use of titanium alloys. The aim of this study is to examine the effect of solutionizing temperature on microstructure, hardness, wear, cavitation re...

Lightweight magnesium (Mg) alloys are employed in a wide range of applications due to their high specific strengths. Nevertheless, some applications require improvement of the wear resistance of Mg alloys. The purpose of this study was to investigate the effect of the initial surface conditions, cold spray temperature, and coating material on the w...

Mg alloys are preferred in automotive, aircraft, aerospace and communication industries due to their low specific gravity and high strength. WE series is a series of Mg alloys containing Mg, Y, Nd, rare earth elements, and although the creep strength is good for this alloy series, the wear resistance is open to improvement. The aim of this study is...

In this study, Ta2O5, TiN, and TiO2 are coated with magnetron sputtering method as monolayer and bilayer on Ti6Al4V alloy used in biomedical applications. The deposited coatings are characterized, and their mechanical properties are determined by nanoindentation tests. As a result of the pin-on disc wear test performed in dry environment and room t...

Sıcak Boru Büzme Prosesinin Sonlu Elemanlar Metoduyla İncelenmesi

Sert dolgu kaplamalar, pek çok mühendislik uygulamasında iş parçalarının aşınma ve korozyon direncini artırmak amacıyla kullanılan yöntemlerden biridir. Bu çalışmanın amacı, karbür yapıcı elementlerden molibden ve vanadyumun Fe-Cr-C esaslı sert dolgu alaşımlarına ilave edilerek mikroyapı ve aşınma özelliklerinde meydana gelecek değişimleri inceleme...

A Sheet Metal Forming (SMF) process, especially deep drawing, is one of the manufacturing processes that commonly used in the automotive industry. Compared with casting and forging, the SMF process has several advantages, including lesser weight materials and broader variations in shape that can be made. The most important of the problems in the SM...

Toprak işleme makinaları sürüm işlemi yaparken, işleyici parçalar ile toprakta bulunan kuvars veya korundun gibi partiküller sürtünmektedir ve bu durum toprakta sürüm yapan işleyici tarım ekipmanlarında aşınmalara neden olmaktadır. Ülkemizde, bu ekipmanların mekanik özelliklerinin iyileştirilmesi ve aşınmaya karşı dirençlerini artırabilmek amacıyla...

In this study, microstructure and mechanical properties of nickel matrix B4C reinforced functionally graded composites produced by powder metallurgy method were investigated. Samples with Ni+5% B4C, Ni +10% B4C, Ni+ 15% B4C and Ni+ 20% B4C compositions were sintered at 900 and 1050°C for 60 minutes. Microhardness and wear tests along with optical m...

Synthesis of silicon oxide (SiO2) via the sol-gel method and SiO2 coating ability on to Ti6Al4V alloy were investigated, in the novel study. Ti6Al4V alloy is the most used alloy in biomedical applications due to its many advantages. However, it has a minor disadvantage like releasing ions into the human body. In this study, the substrate material T...

Otomotiv ve makine endüstrilerinde, yorulma dayanımı yüksek olan birçok parçanın imalatında; yüksek mukavemetleri, yüksek darbe dayanımları ve mükemmel yorulma performansları nedeniyle 51CrV4 çelikleri tercih edilmektedir. İçerdikleri Si, Mn, Cr ve V alaşım elementleri nedeni ile mekanik dayanımları yüksektir. Isıl işlem uygulanabilir ve sertleştir...

Bu çalışmada biyomalzeme uygulamalarında kullanılmak üzere etkili bir biyomalzeme geliştirilmesi amaçlanmış ve sol-jel yöntemi kullanılarak Ti6Al4V altlık malzemeler üzerine hidroksiapatit kaplamalar yapılmıştır. Sol-jel yöntemi ile biyoaktifliği ve korozyon dayanımı yüksek, çatlaksız bir kaplama tabakası elde etmek amaçlanmıştır. Bu amaçla, hazırl...

Cold metal transfer (CMT) welding is a brand-new arc welding technique which shows adequate results for welding of thin sheets and dissimilar materials. Corrosion behavior of dissimilar aluminum joints should be determined in terms of predicting the effect of welding process on the possible failures in their constructions caused by corrosive agents...

Z Ti6Al4V, günümüzün biyomalzeme uygulamalarında en çok kullanılan titanyum alaşımıdır. İnsan vücudu içinde toksik/alerjenik etki oluşturmaması ve mekanik özelliklerinin iyi olması nedenleri ile biyomedikal uygulamalarda tercih edilmektedir. Yapılan çalışma, birçok olumlu özellikleri nedeni ile tercih edilen bu korozyon dayanımının geliştirilmesi a...

Z Mikro boyutta üretim bilimsel, teknolojik ve endüstriyel alanlarda oldukça önemli bir yer tutmaktadır. Hali hazırda kullanılan tahribatsız muayene yöntemleri bu tip mikro hataların tespitinde yetersiz kalmaktadır. Makalede açıklanan yeni teknikle bakteri hücreleri, incelenmek istenen yüzeye uygulanarak yüzeye açık olan mikro boyuttaki yarıklar, ç...

Aluminum metal matrix composites were used in various fields such as aircraft, underwater, automobile, aerospace. Several fabrication techniques were used for the production of these composites. Among the various methods, the powder metallurgy route provides dimensional accuracy and high production rates. In this paper, metal matrix composites that...

The effect of the parameters of welding conducted by the method of cold metal transfer on the geometry of the welding pool, the ultimate tensile strength, and the corrosion rate of welded joints of sheets from aluminum alloy AA6061 is studied. The influence of the current, voltage, and heat input rate during welding on the properties of the welded...

Hardfacing coatings involve hard carbide/boride phases dispersed in a relatively soft steel matrix. For the hardness measurements of hardfacing coatings, depending on the micro structure, both the hardness test method and the applied load affect the hardness results; therefore, they affect the wear performance predictions of the coating. For this r...

Günümüzde nemli toprak ortamlarında çalışan makine elemanlarında, kazıcı/delici tarım aletleri ve makinelerinde, içinden sıvı veya gaz geçen boruların iç yüzeylerinde sıkça karşılaşılan ve ciddi kayıplara neden olan sorunlardan biri korozyondur. Kısa sürede korozyon etkileri ile karşılaşmamak ve korozif ortamlarda çalışan bu elemanları daha uzun sü...

Sert dolgu kaplamaları sert, aşınmaya ve korozyona dayanıklı karbür ve/veya borid bileşikleri nedeniyle kalın ve koruyucu bir tabaka oluşturur. Bu tabaka sayesinde malzemelere korozyon ve aşınma dayanımı kazandırarak nemli ortamlarda çalışan toprak kazıma ve işleme aletleri ve taş-maden ocaklarında kullanılan ve hızlı bir şekilde aşınan ve korozyon...

Aluminum is one of the most important metallic material that has a combination of various features such as high specific strength, corrosion resistance against harsh environments and lightness. In order to improve both the strength and toughness of the alloys, hard particles such as TiC, SiC and Al2O3 are being used currently. But today, recycling...

Aluminum is one of the most important metallic material that has a combination of various features such as high specific strength, corrosion resistance against harsh environments and lightness. In order to improve properties of aluminum such as corrosion or wear resistance, toughness or hardness, hard particles are being used currently. This study...

La industria aeroespacial y del automóvil están necesitadas de materiales que combinen varias características, tales como bajo peso, elevada resistencia mecánica, alta resistencia a la corrosión y al desgaste. Las propiedades de las aleaciones de aluminio se pueden mejorar enormemente mediante el refuerzo utilizando partículas cerámicas. El objetiv...

Corrosion is the degradation of the metal as a result of chemical reactions with its surroundings. However, corrosion can be predicted, in some cases significantly slowed down or prevented. In this study, the effect of galvanic corrosion formation on the tensile strength of AA7075-galvanized steel joints produced by cold metal transfer welding, whi...

Bu çalışmada, soğuk dövme yöntemi kullanılarak üretilmiş bağlantı elemanına ait kılcal çatlakların Eddy Current sistemi ile analiz edilerek verilerin mikroyapı sonuçları ile karşılaştırılması gerçekleştirilmiştir. Soğuk Dövme yöntemi, malzemeyi plastik deforme ederek şekil verme işlemidir. Bu yöntem ile üretilen bağlantı elemanlarında seri üretim ö...

The trend of using lightweight materials in the automotive industry brings along the necessity of dissimilar welding of aluminum alloys such as AA5754 and AA6061. Hybrid structures in automobiles are subjected not only to mechanical forces but also corrosive effects of the environment. In this study, cold metal transfer welding, which is suitable f...

Aluminum/SiC composites are widely employed in the automotive industry. Aluminum composites can be produced by hot pressing which forms a final product with a low porosity level and a denser structure. Homogeneous distribution of reinforcement particles, the level of porosity, and heat treatment not only affect the mechanical properties of the comp...

In recent years there have been many casualties due to mining accidents in our country and there have been searches and anticipations for new developments in mining and tunnel construction sector. With the emergence of new developments, it is possible to secure the expected precision of tunnel projects in a short time, at low cost and high quality....

Cold Metal Transfer (CMT) welding provides many advantages for welding of dissimilar materials and thin sheets with its superior heat input control mechanism. In present study, AA6061 and AA7075 aluminium alloys were joined with CMT welding. The effect of welding parameters on hardness, tensile strength and corrosion rate was investigated. Tafel ex...

In places where the corrosive environments are dense, hardfacing is frequently used, especially in soil scraping tools, stone, and mines, in order to prevent the wear of materials. In this study, Elhard 350 + Elhard600S (EE) and Hardcore600G + Hardcore 63-O (HH) hard filler wires were applied to AISI 4140 steel. The effect of the chemical content a...

Ürünlerde, üretim ve kullanım sırasında oluşabilecek olan hataların önceden tespit edilmesi ve önlemlerin alınması önemli bir konudur. Ürünlere zarar vermeden yapılan inceleme işlemlerine tahribatsız muayene adı verilmektedir. Artan sanayileşme ile günümüzde, malzemelerde daha yüksek servis güvenilirliği ve kalite talebi, tahribatsız muayene teknik...

The aluminum alloy casting sector is growing production volume in order to meet increasing demand. Nondestructive inspection methods are tests in which the material is controlled without being damaged so as not to impede its use after examination. Non-destructive inspection methods are preferred primarily for the control of faulty products. Non-des...

The aim of this study was to produce low weight sheets with high impact strength using steel wire and fiber reinforcing materials. In the study, it was aimed to obtain the desired structure by applying hand lay-up process with epoxy resin matrix material on the composite to be produced with different fiber reinforcing materials and steel wire. In a...

Minimizing wear would ensure reduced loss of material, labor and time for numerous branches of industry. Hardfacing coating method is a promising application to overcome this loss. The purpose of the the hardfacing application is to support, repair or improve the surface that is susceptible to abrasion by forming hard phases. The present study was...

In this study, overlap welding of AA5754 and galvanized steel sheets was carried out by cold metal transfer (CMT) method using ER4043 (AlSi5) filler wire. The effect of heat input on the formation of intermetallic compound (IMC) layer between steel and aluminum was investigated. Mechanical properties of the joints were determined by tensile and har...

Iron-based hardfacing alloys provide an economical and effective solution for the protection of workpieces and the prolongation of service life which subjected to severe abrasive wear. In this study, hardfacing coatings were produced by adding a mixture consisting of iron and ferroboron (FeB) and ferrochrome (FeCr) powders in the iron and carbon ba...

zet Bu çalışmada, GGG40 küresel grafitli dökme demirlere (KGDD) indüksiyonla yüzey sertleştirme işleminin; mikroyapıya, sertliğe ve aşınma davranışına olan etkileri araştırılmıştır. Bu amaçla; GGG40 KGDD numunelere 900 o C de 0.90 dk ilerleme hızında indüksiyonla yüzey sertleştirme ısıl işlemi uygulanmıştır. GGG40 KGDD numunelerde indüksiyonla yüze...

Boron is an efficient element for gaining superior properties of iron-based materials even with small additions. Present study aimed to investigate the effect of boron on microstructure and accordingly on hardness of Fe-Cr-C based hardfacing coatings. The morphology of eutectic carbides changed significantly in the boron content of 0.8 wt. %. Carbi...

This study was aimed to investigate the welding parameters on mechanical behavior of 2 mm thick AA1050 sheet materials joined by cold metal transfer (CMT) method. Macro structural examination showed that decreasing heat input decreased the pore size in the weld metal. Tensile test was applied and failure occurred in heat affected zone of aluminum s...

In conventional recycling method, metal chips are cast after pressing and melting in electric arc furnace. Material loss occurs during the recycling from liquid metal due to the several reasons. Direct recycling method which produces the aluminium powder from aluminium chips using mechanical mill can be an alternative to conventional recycling meth...

This study aims to investigate the weldability of 1050 aluminum alloy (AA1050) and galvanized 1314 steel by the cold metal transfer (CMT) procedur, comparing it with respective welding of similar aluminum sheets. Mechanical properties of welded specimens were determined by tensile testing and hardness measurements. The study was completed by micros...

Aluminum matrix composites are used commonly for their high mechanical properties, high thermal resistance and high wear resistance in composite materials. While process of Al matrix composite's welding, some difficulties may occur due to porosity and some problems of microstructure in weld metal. For this reason, according the core material a redu...

Silicon carbide is often the preferred reinforcement in the production of aluminium-powder composites. In this study, alumi-nium composites were produced with 10 % and 20 % silicon-carbide and ferroboron reinforcements and (0, 0.5, 1 and 1.5) % graphite additions using powder metallurgy. The effects of the reinforcement type, the amount and the gra...

This study was aimed to investigate the weldability of 1050 aluminium alloy (AA1050) and galvanized 1314 steel by cold metal transfer (CMT) method comparing with CMT welding of similar aluminium sheets. Mechanical properties of welded specimens were determined by tensile testing and hardness measurements and these results were supported by microstr...

Purpose – It is important to know the friction coefficient and wear loss for determination of tribological conditions at journal bearings. Tribological events that influence wear and its variations affect experimental results. The purpose of this paper is to determine friction coefficient and wear loss at CuSn10 alloy radial bearings by a new appro...

In the study the effects of multi-process parameters on the surface roughness during the machining of the AA6013 aluminum alloy with non-coated cemented carbide milling cutters were investigated by using Taguchi's experimental design method. Experiments were conducted on the basis of Taguchi's L16 orthogonal array (OA) at different levels of the fa...

Retrogression and re-aging (RRA) process are applied in an attempt to enhance mechanical properties and corrosion resistance of 7075 aluminium alloys. In this study, retrogression and re-aging process have been applied to a 7075 aluminium alloy at 170 °C for 5, 40, 80 min and wear resistance of RRA applied samples have been investigated by ball-on-...

In this study, the effect of pre-aging time and temperature on mechanical properties of aluminium alloys 6082 and 7075 has been investigated. Pre-aging has been applied at 50, 60, 70 and 80 °C for 24, 72, 144 hours after solution treatment process at 560 °C for 1 hour. Then these samples have been subjected to an aging process at 180 °C and 125 °C....

MEYVECİ, A., KARACAN, I., DURMUS, H. and CALIGULU, U.," Artificial Neural Network (ANN) Approach to Hardness Prediction of Aged Aluminium 2024 and 6063 Alloys" MP-Materials Testing-Materials and Components Technology and Application, 54 (1), 36-40, 2012.

In this study, the effect of aging heat treatment on the hardness of AA 2024 and AA 6063 aluminum alloys was investigated by experimental and an Artificial Neural Network (ANN). AA 2024 and AA 6063 aluminum alloys were solution treated at two different temperatures of 490° C and 520° C. Then both samples were cooled to room temperature. After this...

Surface modification of a Ti6A14V titanium alloy was made by the plasma nitriding process. Plasma nitriding was performed in a constant gas mixture of 20% H 2-80% N 2 at temperatures between 700 and 1000° C and process times between 2 and 15 h. Samples nitrided at different treatment times and temperatures were subjected to the dry sliding wear tes...

Statistically processed data on the microstructure and wear of aged aluminum alloys AA2024 and AA6063 are presented. Results of wear tests are analyzed using multidimensional analysis of variance (MANOVA) with 95% confidence interval for statistically significant deviations. It is shown that the temperature and the duration of the aging are statist...

For this study 5083 Aluminium alloy plates, as used in automobiles and watercraft, were experimentally MIG welded. The plates were joined with different wires and at various currents. The effects of welding with different parameters on the mechanical and corrosion properties were investigated. The corrosion behaviour of the MIG welded 5083 Aluminiu...

MEYVECI A., KARACAN, I., FIRAT, E. H., CALIGULU, U., DURMUS, H., “Study of Wear of Aged Aluminum Alloys 2XXX and 6XXX within the Manova Statistical Analysis, Metal Science and Heat Treatment, Vol. 53, Nos. 3-4, pp. 173-175, July, 2011. DOI: 10.1007/s11041-011-9363-5

For this study 5083 Aluminium alloy plates, as used in automobiles and watercraft, were experimentally MIG welded. The plates were joined with different wires and at various currents. The effects of welding with different parameters on the mechanical and corrosion properties were investigated. The corrosion behaviour of the MIG welded 5083 Aluminiu...

In this study, wear behaviors of aged aluminium AA 2024 and AA 6063 alloys were investigated. AA 2024 and AA 6063 aluminium alloys were solution treated at two different temperatures of 490 and 520°C. Then all samples were cooled to room temperature. After this process, the samples were aged at three different temperatures (140°C, 180°C and 220°C)...

MEYVECI, A., KARACAN, İ., CALIGULU, U. and DURMUS, H., “Pin-On-Disc Characterization of 2XXX and 6XXX Aluminium Alloys Aged by Precipitation Age Hardening”, Journal of Alloys and Compounds, 491(1-2), 278-283, 2010.

In this study, Al99—SiC composites were produced using PM method. In the composites produced, the reinforcement rates of SiC were 0, 5, 10, and 20 (%wt). The matrix Al 99 powders were mechanically mixed with SiC particulates. These powders were compacted at room temperature at 500 MPa for 5 × 10 × 60 mm specimens and followed by sintering at 600 an...

In the present work, mechanically alloyed Al-12Si and SiO2 powder was deposited onto an aluminium substrate by atmospheric plasma spraying (APS) to obtain a composite coating consisting of in-situ formed alumina reinforced hypereutectic Al-18Si matrix alloy. The effects of spray parameters and in-flight particle characteristics on reaction intensit...

In this study, statistical values of microhardness were investigated in terms of temperature and duration of aged aluminium 2XXX and 6XXX alloys. AA 2024 and AA 6063 aluminum alloys were solution treated at two different temperatres of 490°C and 520°C. Then all samples were cooled to room temperature. After this process, the samples were aged at th...

The aim of this paper is to investigate age hardening behavior of PM AA2014 alloy. The specimens were made by powder metallurgy (PM) method. During the PM the product was made from powder basic materials by pressing (at 600MPa) and sintering (600±5°C, 610±5°C, 620±5°C). There were three steps that occur in age-hardening; solution treatment (510±5°C...

Artificial neural networks (ANNs) are a new type of information processing system based on modeling the neural system of human brain. Effects of ageing conditions at various temperatures, load, sliding speed, abrasive grit diameter in 6351 aluminum alloy have been investigated by using artificial neural networks. The experimental results were train...

In this paper, the wear performance of the aged AlMgSi1 alloy was investigated. Great improvements in mechanical properties of Al alloys can be achieved by suitable solution treatment and aging operations. A pin-on-disk wear machine was designed and developed for abrasive wear tests. The wear resistance was evaluated using a pin-on-disk wear testin...

Special features of abrasive wearing are investigated for deformable AA6351 aluminum alloy depending on aging conditions and regimes of the tribological tests. The latter are carried out under conditions of dry friction (without lubricating) in air in the presence of friction particles, formed at the specimen surface. The values of hardness of allo...

In this study, wear behaviours of 2024 aluminium wrought alloy were investigated in different tribological conditions based on its ageing conditions. For this purpose, the alloy aged in five different temperatures and periods (at room temperature for 1 week, at 120°C for 24h, at 150°C for 18h, at 160°C for 16h, at 200°C for 2h) was worn in pin-on d...

Geliş Tarihi : 28.05.2002 ÖZET Bazı alüminyum alaşımlarına çökelme ısıl işlemi uygulanarak mekanik özellikleri değiştirilebilmektedir. Tek fazlı bölgede uygun bir sıcaklıkta, çözeltiye alma ısıl işlemi ile elde edilen aşırı doymuş katı çözelti, doğal ve/veya yapay olarak yaşlandırılıp iç yapıda çökeltiler oluşturulmaktadır. Bu intermetalik çökeltil...

Nickel-Chromium alloys have good corrosion and oxidation resistance, high rapture and creep resistance at high temperatures, but wear resistance is too low. Plasma nitriding was performed at differnt temperatures and times in %15 H 2 ve %85 N 2 constant gas mixtures in order to high wear resistance and biocompability. Hardness values of surface lay...