Synthesis of Al7075/TiB2-Al2O3 In-Situ Hybrid Composite by Stir Casting Method

In this study, mechanically milled (MM) Al-24TiO2-20B2O3 powder in molten Al7075 matrix was used order to fabricate in-situ TiB2 and Al2O3 reinforcements matrix. Differential thermal analysis (DTA) examination adopted find reaction temperature between Al, TiO2, B2O3 powders. X-Ray Diffraction (XRD) patterns showed the existence of peaks (750 °C at Ar atmosphere) MM powder. Scanning Electron Microscopy (SEM) results revealed uniform distribution TiO2 particles aluminum 6 wt.% added 750 °C. The Al7075/TiB2-Al2O3 composite poured copper mold. stir casted composites were hot extruded 465 with extrusion ratio 6:1 ram speed 5 mm/s. microstructures (optical microscopy TEM) mechanical properties (hardness tensile testing) samples evaluated. TEM that nanoparticles formed. strength reached value 496 MPa. This result around four times greater than as cast alloy.