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Öğe The effect of diffuser and non-diffuser runner systems on the mechanical properties of A356 alloy(2013) Tunçay, T.; Tekeli, S.; Özyürek, D.In this study, runner systems which have equal cross-sectional area and different forms of cross-sectional diffuser and non-diffuser runner system's effects on mechanical properties of A356 aluminium alloy, depending on the movement of the liquid metal, were investigated. The aim of the study is to reduce casting defects due to inclusion caused by runner systems such as gas or shrinkage porosity. Therefore, the horizontal runners have been extended by using diffusers having cross-sectional area equivalent with a different cross-sectional shape (square, rectangular and circular outlet). Tensile test specimens were prepared from the plates of casting A356 alloy and tensile tests were performed. Obtained results were examined Weibull statistical analysis. As a result, one hand, it is observed that the turbulence effect on liquid metal has been decreased the highest tensile results and Weibull modulus has been appeared on the samples which have horizontal runners produced by using a square section diffuser in designed horizontal diffuser. On the other hand, according to Scanning Electron Microscope (SEM) analysis on fracture surfaces, fracture has been observed in the area of intermetallic secondary phases (oxides etc.) and in area with gas or shrinkage porosity.Öğe The effects on microstructure and mechanical properties of filtration in Al-Si-Mg alloys(Gazi Universitesi Muhendislik-Mimarlik, 2014) Tunçay, T.; Özyürek, D.In this study, on microstructure and mechanical properties of Al-Si-Mg alloy was investigated effects of ceramic foam filters having different density of cell. Ceramic foam filters is used to minimizing bifilm, inclusion, sand wash away from of the mould wall, gas or shrinkage porosity such as casting defects. As a result of the tensile test results were evaluated with Weibull distribution and the quality index. Mechanical properties and castability were examined by ceramic foam filters using in Al-Si-Mg alloy. Experimental studies were used on horizontal runner a ceramic foam filter having different density of cell (20 and 30 ppi). According to Tensile test results, due to the increased density of ceramic foam filter cell gap could be controlled flow behaviour of the liquid metal in the running system. Improving mechanical properties of Al-Si-Mg alloy has been demonstrated by increasing Weibull modulus and quality index. In addition to increasing the amount of cell gap in ceramic foam filter, quality index is also increasing. Tensile fracture surfaces of samples was investigated Scanning Electron Microscope (SEM), to fracture occurs secondary intermetallic phases, inclusion and bifilm defect concentration regions.
