Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: Javad Joudi
Supervisor: GÖKHAN KÜÇÜKTÜRK
Abstract:Metal Matrix Composites (MMC) are newly developed materials with high elastic modulus, high abrasion resistance, high strength, heat resistance. Physical properties such as high hardness and abrasion resistance make it difficult for MMCs to be processed with conventional processing methods. Processing of very hard composite materials using conventional machining methods has resulted in high tool wear due to the abrasive nature of reinforcement particles, which reduces tool life. In advanced non-traditional machining methods such as water jet machining and laser beam machining, these materials are applied in machining, but in these methods, there are problems such as tool cost and work piece dimensional constraints. This study investigated the processing properties of TiB2-reinforced Al 2014 metal matrix composite (MMC) with electro-discharge machining (EDM) and powder-mixed electro-discharge machining (PMEDM). Three different Al 2014 composite samples supplemented with 2%, 4% and 8% TiB2 were produced under optimum conditions using a vacuum infiltration method. Composite samples with different reinforcement volume ratios were examined to show the effect of different reinforcement ratios and different process parameters on the machinability of MMKs. The experiments were carried out with different currents and reinforcement ratios to determine the effect of TiB2 content on the workpiece speed (HR) and tool wear rate (TAH). When the results obtained from the experiments are compared, it is seen that when compared to İHI and TAH, the method of TEEI is better than EEI method. The applied current and the reinforcement rate also had a significant effect on the Workpiece Machining speed (IR) value. Studies have shown that with the increase of the applied current, IHI increases, however, IGE has decreased in higher reinforcement ratios. The results also show an increased tool wear rate at higher currents and reinforcement ratios. The effects of surface roughness on the processing parameters were also investigated. The increase in the applied current and the reinforcement rate caused the surface roughness to increase. Moreover, ANOVA analysis was performed on the results obtained in this study and the effects of the parameters as a percentage were determined. In addition, the regression equation obtained as a result of the analysis is given.