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Öğe Corrosion behavior of graphene nanoplatelet-coated tib2 reinforced az91 magnesium matrix semi-ceramic hybrid composites(2021) Çevik, Engin; Gündoğan, Murat; Incesu, Alper; Turan, Muhammet EmreIn this study; Hybrid composites containing different proportions of TiB2 and graphene were produced using the pressure infiltration method. Inert SF6 gas is used to prevent oxidation in the productions. While 8 bar infiltration pressure was provided by argon gas, the infiltration temperature was chosen as 800°C. The corrosion behaviors of the compos-ite materials were examined. Corrosion resistance was determined by potentiodynamic and immersion corrosion testing in 3.5% NaCl solution. In addition, SEM examinations were conducted to understand the corrosion mechanisms. At the end of the measurements, the highest porosity was measured as %4,7 in composite containing 1% graphene compared to pure matrix and composite containing only TiB2. The added reinforcement (TiB2 and Graphene) elements cause decreases in corrosion resistance. The highest corrosion resist-ance was achieved in AZ91 alloys.Öğe Dry Sliding Wear Behavior of (MWCNT plus GNPs) Reinforced AZ91 Magnesium Matrix Hybrid Composites(Korean Inst Metals Materials, 2020) Turan, Muhammet Emre; Zengin, Huseyin; Sun, YavuzThis study aims to improve tribological performance of magnesium alloy with the addition of carbonaceous (C-based) reinforcements. Synergetic effects of MWCNT and GNPs on wear performance of AZ91 magnesium alloy was evaluated with this report. AZ91-0.3 wt% MWCNT and AZ91-0.15 wt% MWCNT-0.15 wt% GNPs hybrid composites were synthesized using hot pressing via semi powder metallurgy. Microstructures were examined by scanning electron microscope and x-ray diffraction test devices then hardness and wear tests were performed for all samples. Results clearly show that hardness and wear behaviors of AZ91 magnesium alloy were improved significantly with the addition of reinforcements. Uniform distribution of carbon atoms was achieved for both of two samples. AZ91-0.15 wt% MWCNT-0.15 wt% GNPs composite showed best wear performance among the specimens.Öğe The effect of GNPs on wear and corrosion behaviors of pure magnesium(Elsevier Science Sa, 2017) Turan, Muhammet Emre; Sun, Yavuz; Akgul, Yasin; Turen, Yunus; Ahlatci, HayrettinThis study aims to investigate the role of graphene on wear and corrosion behaviors of pure magnesium. Magnesium/Graphene Nanoparticle (GNP) composites were fabricated via semi powder metallurgy method with a different content of graphene (0.1, 0.25 and 0.5 wt%). The effect of graphene in pure magnesium was examined by hardness, wear and corrosion tests. Microstructural and phase analysis were carried out by Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) analysis. Experimental results revealed that, hardness values increased with the addition of graphene. There was a same trend in wear behaviors with increase of graphene rate. The best wear performance was belonging to the 0.50 wt% graphene/mg composite under load of 10N. So improvement of wear properties was achieved using graphene as reinforcement. According to the microstructural evolution, the uniform distribution was achieved for all samples but partially agglomeration could be seen in Mg-0.50 wt% graphene. Compared to the pure magnesium, corrosion performance was affected negatively in graphene reinforced composites. (C) 2017 Elsevier B.V. All rights reserved.Öğe Effect of Multiwalled Carbon Nanotubes on Elevated Temperature Tensile and Wear Behavior of Al2024 Matrix Composites Fabricated by Stir Casting and Hot Extrusion(Springer, 2020) Turan, Muhammet Emre; Rashad, Muhammad; Zengin, Huseyin; Topcu, Ismail; Sun, Yavuz; Asif, MuhammadIn this study, aluminum alloy matrix composites reinforced with MWCNT particles by 0.5 wt.% were fabricated by a new developed technique, consisting of semi-powder metallurgy and stir casting processes. Then, hot extrusion process was applied to the composite materials. Phase analysis and microstructure investigations were performed for the as-cast and extruded samples. Hardness test was conducted, and tensile tests were applied at room, 150 and 250 degrees C. The tribological performances of unreinforced alloy and MWCNT-reinforced composite were examined at room, 150 and 250 degrees C as well. The results showed that hardness of base aluminum alloy was improved. The peaks belonging to the MWCNT were detected by x-ray diffraction (XRD) analysis. The incorporation of MWCNT presents strengthening effect on the mechanical properties at all test temperatures. The wear rate generally decreased with the addition of MWCNT for all test conditions. Extrusion process had a positive effect to enhance wear and hardness behavior. Abrasive, adhesive, oxidative and thermal wear mechanisms were observed by scanning electron microscope.Öğe Effect of Zn content and heat treatment on tribological behavior of biodegradable Mg-xZn alloys in simulated body fluid(Iop Publishing Ltd, 2019) Koc, Erkan; Turan, Muhammet EmreIn this study, magnesium alloys with different weight fractions of zinc were fabricated and heat treatment was performed. Microstructure of specimens was characterized by Light Optical Microscope (LOM). Wear tests were applied under different loads in simulated body fluid. Results show that aging process effects tribological behavior of Mg-Zn alloys positively. Mg-3Zn alloy exhibits best wear performance under 2 N load among the samples. Simulated body fluid possesses lubricant properties during wear tests. 16 h heat treated alloys show better wear characteristic than non-heat treatment samples due to decreasing of internal stress. Abrasive and oxidative wear mechanisms are observed by Scanning Electron Microscope (SEM).Öğe EFFECTS OF BISMUTH (BI) ADDITIONS ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF AZ91 ALLOY(Tanger Ltd, 2015) Elen, Levent; Zengin, Huseyin; Turen, Yunus; Turan, Muhammet Emre; Sun, Yavuz; Ahlatci, HayrettinIn this study, the effects of bismuth additions of 0.2, 0.5 and 1 wt% on microstructure and mechanical properties of AZ91 alloy were examined. A permanent mold casting procedure was carried out to produce the alloy billets under a mixed gas atmosphere of SF6 and CO2. Microstructural investigations showed that Mg3Bi2 intermetallic phases were formed in all the samples and it coarsened with increasing amount of Bi in AZ91 alloy. Furthermore, a finer dispersion of Mg17Al12 intermetallic phases was observed in the structures as the amount of Bi in AZ91 increased. It was also showed that increasing Bi addition increased the hardness of AZ91 alloy. However, the highest hardness value was found for the alloy having 0.5wt% Bi addition that means high amount of Bi can decrease the hardness of AZ91 alloy. On the other, there were no considerable changes in the tensile strengths and yield strengths of the alloys as the amount of Bi increased although a slight increase in both strengths were observed with increasing amount of Bi. Percent elongation at break showed a decrease as Bi addition increased.Öğe Effects of carbonaceous reinforcements on microstructure and corrosion properties of magnesium matrix composites(Elsevier Science Sa, 2018) Turan, Muhammet Emre; Sun, Yavuz; Aydin, Fatih; Zengin, Huseyin; Turen, Yunus; Ahlatci, HayrettinIn this study carbonaceous (C-based) reinforced AZ91 matrix composites were fabricated with the same weight fraction of 0.50 wt.% via semi powder metallurgy. The hot pressing test machine was used under high purity argon atmosphere. Multi-wall carbon nanotube (MWCNT), Graphene Nanoplatelets (GNPs) and Fullerene (C60) were used as reinforcements. Microstructure, hardness and corrosion performances of fabricated composites were investigated. Results show that hardness of AZ91 alloy was improved with the addition of carbonaceous reinforcements. AZ91/C60 composite exhibited highest hardness performance. However, corrosion performance of AZ91 was affected negatively by the addition of reinforcements. MWCNT exhibited highest corrosion rate among the fabricated samples.Öğe The electromagnetic wave absorption properties of woven glass fiber composites filled with Sb2O3 and SnO2 nanoparticles doped mica pigments(Wiley, 2022) Akinay, Yuksel; Colak, Bektas; Turan, Muhammet Emre; Akkus, Ihsan Nuri; Kazici, Hilal Celik; Kizilcay, Abdullah OguzIn this study, the electromagnetic wave absorption properties of woven glass fiber reinforced epoxy composites with Sb2O3 and SnO2 nanoparticles doped mica pigments were investigated. Herein, we synthesized SnO2/mica, Sb2O3/mica, and Sb2O3:SnO2/mica pigments using the sol-gel method. Subsequently, mica pigments filled glass fiber/epoxy composite panels were fabricated with a vacuum assisted resin mold. The phase, crystal, and morphological examinations of particles confirm the deposition of SnO2 and Sb2O3 nanoparticles on the mica surfaces. The electromagnetic wave absorption properties of samples were measured using the S parameters and obtained dielectric data. Sb2O3:SnO2/mica particles display higher complex permittivity and dielectric loss values due to the strong interfacial polarization between conductive nano metal-oxide shells and mica surfaces. According to the calculated reflection loss values, Sb2O3:SnO2/mica particles exhibit superior electromagnetic wave absorption performance with a minimum reflection loss of -25.62 dB for 2.4 mm thicknesses with effective bandwidth between 9.3 and 12.4 GHz. The S parameters of the prepared structural composites with the size of 30 cm x 30 cm x 3 mm was determined by the free-space technique using the transmission line technique. According to the S-12 parameters, filled glass fiber/epoxy composite containing 25 wt% Sb2O3:SnO2/mica show a minimum reflection loss of -20.426 dB at 8.2 GHz with effective bandwidth between 8.2 and 9.67 GHz. These results indicate that Sb2O3:SnO2/mica-filled fiber/epoxy composite is an excellent candidate for the practical application of electromagnetic wave absorbers.Öğe Evolution of Microstructure, Mechanical Properties, and Corrosion Resistance of Mg-2.2Gd-2.2Zn-0.2Ca (wt%) Alloy by Extrusion at Various Temperatures(Mdpi, 2023) Zengin, Hueseyin; Ari, Soner; Turan, Muhammet Emre; Hassel, Achim WalterThe current investigation involved casting the Mg-2.2Gd-2.2Zn-0.2Ca (wt%) alloy (GZX220) through permanent mold casting, followed by homogenization at 400 degrees C for 24 h and extrusion at 250 degrees C, 300 degrees C, 350 degrees C, and 400 degrees C. Microstructure investigations revealed that alpha-Mg, Mg-Gd, and Mg-Gd-Zn intermetallic phases were present in the as-cast alloy. Following the homogenization treatment, a majority of these intermetallic particles underwent partial dissolution into the matrix phase. alpha-Mg grains exhibited a considerable refinement by extrusion due to dynamic recrystallization (DRX). At low extrusion temperatures, higher basal texture intensities were observed. The mechanical properties were remarkably enhanced after the extrusion process. However, a consistent decline in strength was observed with the rise in extrusion temperature. The corrosion performance of the as-cast GZX220 alloy was reduced by homogenization because of the lack of corrosion barrier effect of secondary phases. A significant enhancement of corrosion resistance was achieved by the extrusion process.Öğe Evolution of Microstructure, Residual Stress, and Tensile Properties of Mg-Zn-Y-La-Zr Magnesium Alloy Processed by Extrusion(Chinese Acad Sciences, Inst Metal Research, 2019) Zengin, Huseyin; Turen, Yunus; Turan, Muhammet Emre; Aydin, FatihThe microstructure, texture, residual stress, and tensile properties of Mg-6Zn-2Y-1La-0.5Zr (wt%) magnesium alloy were investigated before and after extrusion process, which performed at 300 degrees C and 400 degrees C. The microstructural characterizations indicated that the as-cast alloy was comprised of alpha-Mg, Mg-Zn, Mg-Zn-La, and Mg-Zn-Y phases. During homogenization at 400 degrees C for 24 h, most of the secondary phases exhibited partial dissolution. Extrusion process led to a remarkable grain refinement due to dynamic recrystallization (DRX). The degree of DRX and the DRXed grain size increased with increasing extrusion temperature. The homogenized alloy did not show a preferential crystallographic orientation, whereas the extruded alloys showed strong basal texture. The extrusion process led to a significant improvement on the compressive residual stress and mechanical properties. The alloy extruded at 300 degrees C exhibited the highest basal texture intensity, the compressive residual stress and hardness, and yield and tensile strengths among the studied alloys.Öğe Hybrid Reinforced Magnesium Matrix Composites (Mg/Sic/GNPs): Drilling Investigation(Mdpi, 2018) Abdulgadir, Mustafa M.; Demir, Bilge; Turan, Muhammet EmreThe machinability of graphene-reinforced magnesium-based hybrid nanocomposites produced through the application of powder metallurgy method has not been completely reported. This article presents an experimental investigation on the thrust force, the surface roughness (R-a), and drilled surfaces characteristics in the drilling process of a Mg/SiC/GNPs (magnesium matrix based silicon carbide and graphene nanoplatelets) hybrid magnesium matrix composite. The hybrid composite material was produced through the application of a powder metallurgy method. The experiments were carried out with uncoated, PVD (Physical Vapor Deposition), and CVD (Chemical Vapor Deposition) coated tungsten carbide drill bits at three levels of cutting speeds (30, 40, and 50 m/min), and three different levels of feed rate (0.10, 0.15, and 0.20 mm/rev) under dry machining conditions. Taguchi's L-27 (3(3)) orthogonal array and S/N ratio were used to optimize the optimal parameters for thrust force and surface roughness. The experimental results indicated that the thrust force and the surface roughness were extremely dependent on a particular type of drill bits, feed rate, and cutting speed. The feed rate parameter is known to have a significant influence on the surface finish.Öğe Improved elevated temperature mechanical properties of graphene-reinforced pure aluminium matrix composites(Taylor & Francis Ltd, 2020) Turan, Muhammet Emre; Aydin, FatihIn this study, graphene nanoplatelets (0.25 and 0.5 wt-%) reinforced aluminium matrix composites were synthesised. Microstructures of composites were investigated by X-ray diffraction, scanning electron microscope and transmission electron microscope. Hardness was measured according to the Vickers test method. Tensile tests were performed at both room (25 degrees C) and elevated temperatures (150 degrees C and 250 degrees C). Results showed that hardness was improved with direct addition of graphene. Microstructure of composites was free of macro defects. Yield and tensile strength behaviours of pure aluminium were increased with the addition of graphene especially at room temperature. Graphene-reinforced samples have higher compressive residual stress. From the outer surface to inner surface, transition from compressive to tensile residual stress was observed for samples.Öğe Improved wear properties of magnesium matrix composite with the addition of fullerene using semi powder metallurgy(Taylor & Francis Inc, 2018) Turan, Muhammet Emre; Sun, Yavuz; Akgul, YasinThe present study aims to fabricate fullerene (C60) reinforced magnesium matrix composite via semi powder metallurgy in hot press system under high purity argon atmosphere. Improvement of wear resistance of pure magnesium with the addition of fullerene is also aimed with this study. Hardness and wear tests at room temperature were performed to investigate the mechanical effect of fullerene nanoparticles. Microstructures of fabricated composites were characterized using Scanning Electron Microscope (SEM). Results clearly show that hardness performance was improved up to 0.5wt. % fullerene addition directly. A uniform distribution was also achieved according to the mapping and line EDX analysis for the lower content of fullerene. Agglomeration of fullerene was observed for 1wt. % reinforced composite. Wear performances of pure magnesium were also improved when harder fullerene reinforcements incorporated into the matrix. Abrasion and oxidation were main wear mechanism for unreinforced and fullerene reinforced composites. Enhancement of hardness and wear performances might be attributed to the high specific surface area of fullerene and achievement of uniform distribution of reinforcement in magnesium matrix.Öğe Influence of aging on mechanical properties, wear and residual stress of a Heusler Al-Cu-Fe alloy(Carl Hanser Verlag, 2019) Husem, Fazil; Tezel, Fatma Meydaneri; Turan, Muhammet EmreIn this study, the ferromagnetic Heusler alloy Al-Cu-Fe was aged at a temperature of 300 degrees C for 0.5 h, 1 h, 1.5 h, 2 h and 2.5 h, respectively. The mechanical and structural properties, residual stress state and wear performance of the specimens were investigated. The results show that precipitation has a crucial influence on the mechanical properties and wear performance of a Heusler alloy. The hardness and wear resistance of the specimens improve with an increase of precipitation density. These precipitates are associated with Cu-rich and Al-Cu lamellar structures. The density of these precipitates reveal two certain Al2Cu peaks at an aging time of 90 minutes, and 150 minutes for the annealed specimens.Öğe Influence of carbon fiber content on bio-tribological performances of high-density polyethylene(Iop Publishing Ltd, 2019) Akgul, Yasin; Ahlatci, Hayrettin; Turan, Muhammet Emre; Erden, Mehmet Akif; Sun, Yavuz; Kilic, AliThe present study aims to investigate the effect of short carbon fiber (SCFs) content on wear performance of high-density polyethylene (HDPE). SCFs reinforced composites with different weight fractions (5 wt%, 10 wt%, 15 wt% and 20 wt%) were fabricated by melt compounding and compression molding. To evaluate bio- tribological performance of the samples, three different loads (20 N, 40 N and 60 N) were applied to simulate body fluid (SBF) environment against stainless steel counterface. The scanning electron microscope was used to investigate the morphology of composite granules and worn surfaces of samples. Also, the hardness test was conducted for all samples. The results show that the hardness of high-density polyethylene increases significantly depending on the short carbon fiber content. 20 wt% SCFs reinforced composite exhibited the highest hardness, which is 34% improvement compared to the pure HDPE. However, the same trend was not observed for wear resistance of composites. Composites containing 10 wt% SCFs showed best wear performance in SBF fluid conditions.Öğe Influence of GNPs and B4C reinforcements on mechanical, thermal and wear properties of magnesium matrix composite produced by powder metallurgy(Sage Publications Ltd, 2021) Sun, Yavuz; Cevik, Engin; Turen, Yunus; Ahlatci, Hayrettin; Turan, Muhammet Emre; Aydin, Fatih; Zengin, HuseyinIn this study, graphene nanoplatelets (GNPs) and boron carbide (B4C) nano reinforcements were incorporated to the pure magnesium (Mg). Powder metallurgy route was used to fabricate composite samples. Microstructures of specimens were examined and tensile, hardness, wear tests were performed to determine the mechanical and tribological performance of produced samples. The results indicate that the hardness was increased especially with the addition of 2% B4C and 0.5% GNPs reinforcements. A general trend was observed for the enhancements of yield and tensile strengths when nano reinforcements were added to the pure magnesium. The composite samples showed better wear resistance than the unreinforced sample. However, thermal conductivity began to decrease with the addition of B4C reinforcements. It is also observed that the porosity level was also higher for the composite samples.Öğe Investigation of mechanical properties of carbonaceous (MWCNT, GNPs and C60) reinforced hot-extruded aluminum matrix composites(Elsevier Science Sa, 2019) Turan, Muhammet EmreCarbon-based nanomaterials have been attracted to the worldwide because of remarkable thermal and mechanical properties. In this study, one-dimensional multi-wall carbon nanotube (MWCNT), two-dimensional graphene nanoplatelets (GNPs) and zero-dimensional fullerene (C60) reinforced pure aluminum matrix composites were fabricated to develop mechanical properties of pure aluminum. Solution-based semi powder metallurgy technique and hot extrusion process were used for fabrication. Microstructure and mechanical properties were investigated. Hardness and tensile tests were performed to determine the mechanical performance. Results clearly show that tensile and hardness properties of pure aluminum was significantly improved even low amount (0.25 wt %) of nano carbon addition. C60 reinforced composite exhibits highest yield and tensile strength and it has best hardness value among the produced samples. (C) 2019 Published by Elsevier B.V.Öğe Magnezyum matrisli nanopartikül takviyeli kompozit malzemelerin toz metalurjisi yöntemiyle üretilmesi ve karakterizasyonu(Karabük Üniversitesi, 2018) Turan, Muhammet Emre; Sun, YavuzBu çalışmada, farklı matrisli magnezyum ve magnezyum alaşımlarına farklı oranlarda (ağırlıkça 0.1, 0.25 ve 0.5) karbon nanotüp, grafen ve fulleren başarılı bir şekilde katılarak toz metalurjisi yöntemiyle metal matrisli kompozitler üretilmiştir. Karbon nanopartiküller ile mikron boyuttaki matris malzemelerinin homojen karışması, mekanik alaşımlama gibi geleneksel yöntemlerle zor olduğu için sıvı bazlı özel bir yöntem geliştirmiştir. Bu yöntemle vakum destilasyon sistemi içerisinde manyetik karıştırıcı vasıtasıyla solüsyon içerisinde matris ve takviye malzemeleri uniform bir şekilde karıştırılmıştır. X ışını kırınımı yöntemiyle (XRD) faz analizleri yapılmış, Taramalı Elektron Mikroskopu (SEM) ile mikroyapı analizleri gerçekleştirilmiştir. Sertlik, basma ve aşınma testleri ile mekanik özellikler incelenmiştir. Elektrokimyasal korozyon testleriyle karbon nanopartiküllerin takviyesiz matris malzemesinin korozyon direncine olan etkisi araştırılmıştır. Mikroyapı analizleri neticesinde özellikle düşük oranlarda karbon nanopartikül ilavesi magnezyum matrisi içerisinde homojen bir şekilde dağılmıştır. Takviye oranının ağırlıkça %0.5'e ulaşması durumunda yapıda topaklanmalar görülmeye başlamıştır. Karbon nanotüp takviyesinde karbon atomları arasında güçlü van der waals bağlarının bulunması homojen bir şekilde karışımı zor hale getirmiştir. Bu da mekanik özellikler hususunda yeterince olumlu bir değişikliğe olanak sağlamamıştır. Diğer yandan grafen ve fullerenin matris içerisinde daha uniform dağıldığı gözlemlenmiştir. Karbon ilavesi matrislerde genellikle sertlik, basma dayanımlarını ve aşınma direncini arttırmış ve en iyi sonuçlar genellikle fulleren takviyeli kompozitlerde elde edilmiştir. Karbon nanotüp, grafen ve fullerenin mikroyapı ve mekanik özelliklerdeki olumlu etkilerine ragmen korozyon dirençlerini olumsuz etkilediği gözlemlenmiştir. Bunun sebebi olarak magnezyum ve karbon nanopartiküllerinin arasında galvanik etkileşimin önem arz ettiği tespit edilmiştir.Öğe Mechanical, tribological and corrosion properties of fullerene reinforced magnesium matrix composites fabricated by semi powder metallurgy(Elsevier Science Sa, 2018) Turan, Muhammet Emre; Sun, Yavuz; Akgul, YasinIn this study, fullerene reinforced magnesium matrix composites were produced by semi powder metallurgy using ultrasonication, drying, hot pressing and sintering. Pure magnesium and 0.5 wt% fullerene reinforced composite were characterized for microstructure, mechanical, wear and corrosion properties. The experimental tests revealed that hardness behavior of pure magnesium was improved considerably with the addition of fullerene. Microstructural observations exhibited that fullerene nanoparticle is homogenously embedded in magnesium matrix. According to the compression test results, compression yield and ultimate strength were improved significantly. Furthermore, fullerene reinforced composite showed lower wear rate and coefficient of friction than unreinforced magnesium. However, corrosion rate was increased when fullerene incorporated into the matrix. (C) 2018 Elsevier B.V. All rights reserved.Öğe Piston malzemelerinde kullanılan alüminyum alasımlarının mekanik, asınma ve termal özelliklerinin karbon nano malzemelerle gelistirilmesi(2021) Turan, Muhammet EmreBu projede yarı toz metalürjisi yöntemi ve karıstırmalı döküm tekniginin kombinasyonundan olusan özel bir teknikle karbon nanotüp ve grafen takviyeli otomotiv sektörüne yönelik Alüminyum-Silisyum esaslı hibrit kompozitler gelistirilmistir. Toplam oran agırlıkça yüzde 1 olacak sekilde belirlenmis ve üretilen numunelere yapay yaslandırma islemi uygulanmıstır. Üretilen numunelerin mikro yapıları X ısını kırınımı (XRD), Taramalı Elektron Mikroskopu (SEM) ve Geçirimli Elektron Mikroskopu (TEM) kullanılarak analiz edilmistir. Farklı sıcaklıklarda mekanik testler yapılmıs ve kırık yüzeyler taramalı elektron mikroskopuyla incelenmistir. Asınma testleri kuru ortamda, farklı sıcaklıklarda ve farklı yüklerde yapılmıs, asınma hızları ve sürtünme katsayıları elde edilmistir. Asınma sonrası SEM görüntüleri irdelenerek, asınma mekanizmaları hakkında bilgiler edinilmistir. Son olarak özellikle mekanik ve asınma testlerine göre bazı numunelerin, genlesme, iletkenlik ve yüksek sıcaklıklarda erime entalpisi, sıcaklıga baglı olarak faz dönüsümlerinin gerçeklesip gerçeklesmediginin tespiti için DSC analizleri gerçeklestirilmistir. Genel olarak sonuçlar incelendiginde, karbon nanotüp ve grafen takviyeli kompozitlerde takviyesiz alasımlara göre sertlik degerlerinde önemli artıslar görülmüstür. Yapıdaki karbon nano takviyeler, dislokasyon hareketlerini engelledikleri için mukavemet artıslarını saglamıstır. Uygulanan çekme testleri neticesinde, akma ve çekme mukavemetlerinde artıslar elde edilirken, yüzde uzama degerlerinde düsüsler görülmüstür. Al-%12Si serisinde yüzde 0.5 oranında karbon nanotüp ve 0.5 oranında grafen ilavesi yapıldıgında en yüksek mukavemet degerine ulasılmıstır. %18 Silisyum içeren alasımda ise 0.25 oranında karbon nanotüp ve 0.75 oranında grafenin ilave edildigi hibrit kompozit en iyi mekanik özellik sergilemistir. Karbon nano takviyelerin yapı içerisindeki homojen dagılımı ve kendi aralarında sinerjik etkisi mevcut alasımlarda ciddi iyilesmelere olanak sunmaktadır. Yüksek sıcaklıklarda yapılan mekanik test sonuçlarına göre ise üretilen malzemelerin çekme mukavemetlerinde düsüs, yüzde uzama degerlerinde ise artıslar tespit edilmistir. Asınma test sonuçlarına göre, uygulanan yük arttıkça asınma hızı artmıstır. Takviyeler yüzeyde yaglayıcı ve koruyucu etki saglayarak alasımların asınma performanslarını gelistirmistir. Yüksek sıcaklıklarda yapılan asınma testleri de göz önünde bulunduruldugunda Al-Si alasımlarının asınma dayanımları arttırılmıstır. Genel olarak görülen asınma mekanizmaları, düsük test sıcaklıklarında agırlıklı olarak abrasif, adhezif ve kısmen delaminasyon olmakla beraber, test sıcaklıkları yükseldiginde oksidasyon ve termal ergime asınma mekanizmaları aktif olmaya baslamaktadır. Sonuçlar özetlendiginde, proje hedeflerinden olan nanopartikül takviyeli alüminyum esaslı kompozitlerin döküm sistemiyle üretimi basarıyla gerçeklestirilmistir. Ayrıca farklı sıcaklıklarda mekanik ve asınma özellikleri karbon nano malzemelerle önemli ölçüde gelistirilerek amaca ulasılmıstır.
