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    THE EFFECT OF Si MORPHOLOGY ON MACHINABILITY OF AL-Si ALLOYS
    (PAMUKKALE UNIV, 2015) Uludag, Muhammet; Yazman, Sakir; Bakircioglu, Baris; Dispinar, Derya
    Many of the cast parts require some sort of machining like milling, drilling to be used as a finished product. In order to improve the wear properties of Al alloys, Si is added. The solubility of Si in Al is quite low and it has a crystallite type structure. It behaves as particulate metal matrix composite which makes it an attractive element. Thus, the wear and machinability properties of these type of alloys depend on the morphology of Si in the matrix. In this work, Sr was added to alter the morphology of Si in Al-7Si and Al-12Si. Cylindrical shaped samples were cast and machinability characteristics of Sr addition was studied. The relationship between microstructure and machinability was evaluated.
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    THE EFFECT OF SR MODIFICATION AND HOLDING TIME ON Si MORPHOLOGY AND MECHANICAL PROPERTIES OF ETIAL 195 ALLOY
    (PAMUKKALE UNIV, 2015) Uludag, Muhammet; Gemi, Lokman; Eryilmaz, Muhammed Rasit; Dispinar, Derya
    Hypereutectic Al-Si alloys are typically used in applications where wear resistance is required. The primary factor that determines the wear properties is the morphology of Si in these types of alloys. Pouring temperature is one of the ways to control Si size and shape. On the other hand, bifilm defects that may be present in the liquid can significantly alter the morphology of Si acting as a heterogeneous nucleant. Therefore in this work, castings were made at 800 degrees C with varying holding time and the effects of bifilm on the Si morphology was studied. Bifilm content was measured by Reduced Pressure Test and image analysis was used to characterize Si morphology. In addition, tensile tests were carried out to correlate Si morphology with mechanical properties.
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    Evaluation of the Effects of Rotary Degassing Process Variables on the Quality of A357 Aluminum Alloy Castings
    (SPRINGER, 2016) Mostafaei, M.; Ghobadi, M.; Eisaabadi, Ghasem B.; Uludag, Muhammet; Tiryakioglu, Murat
    The effects of rotary degassing process variables on the melt and casting quality have been investigated using reduced pressure test results and quality index calculations from tensile data. The results showed that the effectiveness of the rotary degassing process of Al alloys is highly dependent on the combination of rotational speed and the gas flow rate, and that the wrong combination of these factors may result in no improvement or even degradation in quality of castings. For the first time, it has been found that the effectiveness of the pouring and filling system to produce high-quality castings can be characterized numerically. This new method of quantifying the casting system is introduced as a new quality improvement tool for materials and process engineers. (C) The Minerals, Metals & Materials Society and ASM International 2016
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    Experimental and statistical analysis of low velocity impact response of filament wound composite pipes
    (ELSEVIER SCI LTD, 2018) Gemi, Lokman; Kayrici, Mehmet; Uludag, Muhammet; Gemi, Dilek Soylu; Sahin, Omer Sinan
    Nowadays, filament wound composite pipes (GRP) are used as a structural element in many applications such as natural gas and oil transmission lines, and portable bridge constructions for military purposes. GRP pipes can expose to impact loading from various causes. This loading can cause an invisible level of damage. Thus, the detection and evaluation of such damages are of great importance. In this study, the low velocity impact response of (+/- 55 degrees)(3) filament wound E-glass/epoxy composite pipes has been studied. The pipes have been subjected to drop weight impact loading with various impact energies. The force-time and force-displacement relations have been examined. The impact damage formation was also evaluated. It is concluded that the damage development in the pipes is controlled by displacement trough radial direction. The obtained results were evaluated statistically by means of Weibull approach. Microscopy analysis of impacted region revealed that debonding, radial cracks, transfer cracks and delamination damage modes are the main observed damage modes.