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    Advances in polylactic acid composites with biofiller as 3d printing filaments in biomedical applications
    (CRC Press, 2023) Mohamed Ariff, Azmah Hanim; Mohammad Akram Syazwie, Mohd Areff; Jaafar, Che Nor Aiza; Leman, Zulkiflle; Calin, Recep
    [No abstract available]
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    Biodegradable synthetic polymer in orthopaedic application: A review
    (Elsevier Ltd, 2023) Al-Shalawi, Faisal Dakhelallah; Azmah Hanim, M.A.; Ariffin, M.K.A.; Looi Seng Kim, Collin; Brabazon, Dermot; Calin, Recep; Al-Osaimi, Maha Obaid
    Every year, many people suffer from bone fractures because of accidents or diseases. Majority of these fractures are too complicated to be treated with conventional medicine and must be mended surgically using non-degradable metal inserts. Such treatment may result in refusal and protection against stress, but may also require another surgical procedure to get rid of the metal inserts. Additionally, biodegradable metals that can readily erode inside the human body come with certain complications. These aspects prompted scientists to find alternatives to metals. Some researchers began to focus on the field of polymers which have shown significant promise in replacing metals. In orthopaedics, degradable polymeric fixation appliances are being studied to substitute metallic implants, eliminating stress protection and avoiding another implant removal surgery. The new generation of bioabsorbable and degradable polymeric implants are free from toxic and mutagenic effects. Nevertheless, these implants have several issues, including mechanical stiffness and strength limitations, unfavourable tissue responses, foreign body reactions, the late response of degraded tissue, and infection due to crystallinity and hydrophobicity. This review discusses the alternative synthetic polymer implant materials available that can be employed and their properties. © 2022
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    Chemical Composition Optimization and Isothermal Transformation of ?-Transformation-Induced Plasticity Steel for the Third-Generation Advanced High-Strength Steel Grade
    (Wiley-V C H Verlag Gmbh, 2024) Okur, Onur; Davut, Kemal; Palumbo, Gianfranco; Nalcaci, Burak; Guglielmi, Pasquale; Yalcin, Mustafa Alp; Calin, Recep
    A new low-manganese transformation-induced plasticity steel is designed with optimized nickel content to achieve superior strength and ductility while minimizing the use of expensive nickel. The steel is optimized using JMatPro software, then cast, and hot rolled. To assess the effect of intercritical annealing on austenite (martensite at room temperature) volume fraction and carbon content, hot-rolled steel samples quenched from different annealing temperatures (680-1100 degrees C) are used. Additionally, hot-rolled steel coupons are intercritically annealed at about 50% austenite formation temperature (740 degrees C) and then subjected to isothermal treatments at 300-425 degrees C for varying times (10-90 min). After optimizing these treatments to maximize retained austenite (RA), tensile specimens are heat-treated first at 740 degrees C and then isothermally at 325 degrees C. Thermodynamic calculations suggest that aluminum combined with silicon may lead to the delta ferrite formation, and even minimal nickel content can stabilize a considerable amount of austenite. In the experimental studies, it is shown that lower-temperature bainitic holding enhances austenite stability by enriching the carbon content. Optimized two-stage heat treatments yield up to 25.8% RA, with a tensile strength of 867.2 MPa and elongation of 40.6%, achieving a strength-elongation product of 35.2 GPax%, surpassing the third-generation advanced high-strength steel grades minimum requirement of 30 GPax%.
  • Küçük Resim
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    Effect of matrix temperature and powder size on the infiltration height of SiO2 -reinforced Al 7075 matrix composites produced by vacuum infiltration
    (Adcotec Ltd, 2011) Calin, Recep; Pul, Muharrem; Citak, Ramazan; Seker, Ulvi
    In this study, Al-MgO metal matrix composites (MMC) were produced with 5 %, 10 % and 15 % reinforcement-volume (R-V) ratios by the melt stirring method. In the production of composites 99.5 % pure Al was used as the matrix and MgO powders with the particle size of -105 mu m were used as the reinforcement. For every R-V ratio; stirring was made at 500 rev/min at 750 degrees C liquid matrix temperature for 4 minutes and the samples were cooled under norrnal atmosphere. Then hardness and fracture strengths of the samples were determined and their microstructures were evaluated by using Scanning Electron Microscope (SEM). In general, it was observed that the reinforcement exhibited a homogeneous distribution in horizontal direction. But there is a slight inhomogeneity in vertical direction. It was determined that the increase in the R-V ratio increased the porosity and also the hardness. As for the fracture strength, the highest strength was obtained with the 5 % MgO reinforced sample.
  • Küçük Resim
    Öğe
    Effect of matrix temperature and powder size on the infiltration height of SiO2-reinforced Al 7075 matrix composites produced by vacuum infiltration
    (Walter De Gruyter Gmbh, 2017) Calin, Recep; Pul, Muharrem; Bican, Osman; Kucukturk, Gokhan
    In this study, the effect powder size and matrix temperature on the physical and mechanical properties of SiO2-reinforced Al 7075 matrix composites were investigated. It was observed that with increasing powder size and temperature, infiltration height was increased. Optimum parameters of full infiltration that were determined for particle size and temperature were d(50) = 150 mu m and 800 degrees C, respectively. It was also observed that the porosity of the produced composites changed in the range of 3.2-14.6%, and the lowest porosity was obtained from the composite having 105 mu m SiO2 particle size. The highest fracture strength (263 MPa) was obtained from the composite produced at a matrix temperature of 800 degrees C and a particle size of 420 mu m. It was concluded that particle size and temperature are effective parameters to reach full infiltration, and this method is more suitable for producing the composites that have high reinforcement volume fractions than conventional casting methods.
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    Effect of Reinforcement Ratio on Infiltration Behavior in Vacuum Infiltration of MgO-Al Composites With Lower Reinforcement
    (Gazi Univ, 2009) Pul, Muharrem; Calin, Recep; Citak, Ramazan; Seker, Ulvi
    In this study, MgO powders, with particle size 149 mu m were filled in steel tubes with 5 %, 10 %, 15 % volume fraction of reinforcement and liquid matrix alloy was vacuum infiltrated into MgO compact under same vacuum condition 550 mmHg, same time 5 min and at different temperatures and volume fraction of reinforcement. Infiltration distance was measured and microstructure and fracture behavior of composite was investigated. It has been found that infiltration distance and fracture strength were decreased with increasing volume fraction of reinforcement. Increasing matrix temperature also facilitates infiltration.
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    Effect of T7 heat treatment on the dry sliding friction and wear properties of the SiC-reinforced AA 2014 aluminium matrix composites produced by vacuum infiltration
    (Sage Publications Ltd, 2014) Aksoz, Sinan; Bican, Osman; Calin, Recep; Bostan, Bulent
    …
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    Fabrication Methods and Characterization Techniques for Porous Ceramic Materials
    (Elsevier, 2021) Dele-Afolabi, Temitope T.; Hanim, Mohamed A.A.; Mazlan, Norkhairunnisa; Sobri, Shafreeza; Calin, Recep; Ojo-Kupoluyi, Oluwatosin J.
    Porous ceramic materials with hierarchical pores and tailored porosity offer remarkable advantages in broad-based applications such as thermal insulation, fluid filtration, waste water treatment and others. So far, researchers and industrial experts have successfully developed porous ceramic systems using different processing technologies. More so, various characterization techniques have been utilized over the years to evaluate the physical and mechanical properties of porous ceramic materials. This work intends to document the different categories of fabrication methods as well as requisite standards necessary for the characterization of porous ceramic materials. © 2021 Elsevier Ltd. All rights reserved.
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    Investigation of The Effect of Mechanical Vibration Applied During Solidification on The Microstructure and Properties of Aluminum 356 Alloy
    (Polska Akad Nauk, Polish Acad Sciences, 2024) Ozgu, Taha Sureyya; Calin, Recep; Tanis, Naci Arda
    Manufacturing by casting method in aluminum and its alloys is preferred by different industries today. It may be necessary to improve the mechanical properties of the materials according to different industries and different strength requirements. The mechanical properties of metal alloys are directly related to the microstructure grain sizes. Therefore, many grain reduction methods are used during production or heat treatment. In this study, A356 alloys were molded into molds at 750 degrees C and exposed to vibration frequency at 0, 8.33, 16.66, 25, and 33.33 Hz during solidification. Optical microscopes images were analyzed in image analysis programs to measure the grain sizes of the samples that solidified after solidification. In addition, microhardness tests of samples were carried out to examine the effect of vibration and grain reduction on mechanical behavior. In the analyzes made, it was determined that the grain sizes decreased from 54.984 to 26.958 mu m and the hardness values increased from 60.48 to 126.94 HV with increasing vibration frequency.
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    Temporary sound barrier system from natural fiber polymeric composite
    (Elsevier Ltd, 2022) Hanim Mohamed Ariff, Azmah; Dele-Afolabi, Temitope T.; Hossain Rafin, Tahrim; Jung, Dong-Won; Leman, Zulkiflle; Anas Md Rezali, Khairil; Calin, Recep
    Sound barriers, rather than shutting off the source of noise, are the most effective method for reducing noise pollution and reducing the intensity from diverse sources. In the present study, a natural fiber was employed alongside a polymer material to produce a sound barrier system. The natural fiber composite used was Rice Husk-PU reinforced composite. The harmonic analysis was performed through ANSYS to evaluate the sound absorbing coefficient and transmission loss. More so, the stress-strain analysis with the total deformation of the panel has been analyzed. In order to have better understanding of the sound absorption coefficient and transmission loss, the frequency range on the simulation was set between 0 and 4000 Hz. The result showed better sound absorption coefficient on the lower frequency region when compared with standard and measured results from published paper. It also simulated higher transmission loss at a high frequency region since high frequency means high sound intensity level. For the validation of the simulated results, the data were compared with the tested experimental results for the same material and a very small difference was observed. © 2022 Elsevier Ltd. All rights reserved.