Research Information System
Thesis Type: Doctorate
Institution Of The Thesis: Gazi University, Fen Bilimleri Enstitüsü, Turkey
Approval Date: 2011
Thesis Language: Turkish
Student: Hasan Karabulut
Supervisor: RAMAZAN ÇITAK
Abstract:Composite materials have advantages in terms of weight, strength, corrosion and wear resistance. Metal matrix composites are one of the compozit material types which can be produced with diferent methods. Powder metallurgy and mechanical alloying is one of these methods. In this study, composite materials produced with mixing and mechanical alloying of the powders and properties were investigated. Al particles were used as matrix material and 10% Al2O3, H4C and SiC particles in weight were used as reinforcement materials. Matrix and reinforcement powders were mixed in a three dimensional turbula for one hour and mechanical alloyed for various duration. Before sintering process, size of the powder were determined by using XRD, SEM and EDS analyse. Characterized powders were pressed under 700 MPa pressure in one direction. Blank samples were sintered at 600 °C in flowing Ar for one our. Microstructure of the composites have been investigated by optical and electron microscopes. Hardness, transverse rupture stregths (TRS) and wear resistances of composites have been determined. Fracture surfaces were investigated with SEM. It was determined that powder size were decreased with increasing MA duration and no reaction alloying was determined. It has also been determined that the hardness increased with increasing MA durations. Wear resistances has been increased in the early stage of MA and than decreased for longer durations. It was determined that Al2O3 reinforced composites showed highest resistance to TRS whereas, B4C reinforced composites showed the highest wear resistance.