Abstract:

The objective of this study is to synthesize aluminum-based metal matrix composite materials (AMMK) by supplementing with lantan oxide (La2O3) particles using powder metallurgy methods and to characterize these composites in terms of microbuilding/mechanical properties.  In experimental studies, the elementary aluminum (Al), silicon (Si), copper (Cu), magnesium (Mg) and La2O3 powders were mixed to form the compositions of Al15Si2,5Cu0,5Mg-x La2O3 (x = 0.5, 1, 2 and 5) and these powders were mechanically fusioned with each other (MA) for 4 hours. Following, mixed (0h MA) and mechanically alloyed (4h MA) powder using a single-axis press under 450 MPa pressure, the cold-pressed and pressed bodies are synthesized without pressure under Ar gas for 2h in 570C.  The characteristics of mixed and mechanically alloy powder and synthesized compounds have been performed using X-ray diffraction (XRD) and scanned electron microscope/energy-distributed spectroscopy (SEM/EDS) techniques.  Furthermore, the ratio intensity of synthesized samples has been determined by the He gas picnometry.  The Vickers' microsurgency values of the compounds and the volume amounts of extraction loss are determined. According to experimental findings, the microserity values of the compounds and the stretching resistance have increased with the increase in the amount of La2O3.  4 h aligned and synthesized Al15Si2,5Cu0,5Mg-size 5% La2O3 composite material was found to have the highest hardness in all compositions (172,24±38 HV) and the lowest stretching loss (0,115 mm3).

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