Research Information System
Thesis Type: Postgraduate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2019
Thesis Language: Turkish
Student: Gözde Keskin
Supervisor: GÖKHAN KÜÇÜKTÜRK
Abstract:In this study, machinability of boron carbide and silicon carbide particle reinforced aluminum metal matrix composites (B4Cp /AA 7075, SiCp/ AA 7075 and (B4Cp+SiCp)/ AA 7075) ) has been investigated by using powder-mixed electrical discharge machining (PMEDM). AA 7075 reinforced with various rates of B4C (10% and 20%), SiC (10% and 20%) and B4C+ SiC ( %5+%5, %10+%10) at different sintering time (90 minutes, 120 minutes and 150 minutes) has been produced via powder metallurgy method. In order to obtain improved material removal rate (MRR) and decreased surface roughness, graphite powder with mean particle size of smaller than 50 nanometer were mixed in kerosene dielectric fluid and experiments were carried on using graphite electrode having 6 mm diameter. Samples were machined with different currents (2A, 4A and 8A) and material removal rates (MRR) and surface roughness values were evaluated. After powder-mixed electrical discharge machining (PMEDM) process, machined surfaces were examined by scanning electron microscopy (SEM). Obtained results indicate that current and percentage of reinforced particle in composite have mostly significant influence on MRR. It was observed from results that MRR mostly increases with increasing of current values, on the other hand MRR decreases with percentage of reinforced particle in composite. Science