Mikron Altı Boyutlu Alümina Katkısının ve Soğuk Deformasyon İşleminin Üretilen Alüminyum Kompozit Yapının Mekanik Özellikleri ve Mikroyapısına Etkisi

Abstract

In this study, submicron-sized alumina reinforced aluminum matrix composites with various alumina (Al 2 O 3 ) content ( 0, 0.5, 1, 1.5, 2, 2.5wt.%) were fabricated by the powder metallurgy method. As a result of the mechanical tests performed to the composite materials, the best mechanical properties were obtained at the Al-2%Al 2 O 3 composite structure. Cold working at the different cold work strain ratios was performed to increase the mechanical properties of Al-2%Al 2 O 3 composites. The effect of cold working on the porosity, apparent density, tensile strength, and Vickers hardness of Al-2%Al 2 O 3 composites was investigated. The microstructure and crystal structure of materials were analyzed with X-ray diffraction (XRD) device and scanning electron microscopy (SEM), respectively. According to the test results, the mechanical properties of Al-2%Al 2 O 3 composite were enhanced up to 11.8.% cold working rate. It was determined that the Vickers hardness increased from 43 HV to 68 HV (+53%) and the compressive strength improved from 71 MPa to 92 MPa (+30%) for 11.8% cold working rate in Al-2%Al 2 O 3 composite structure.