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Synthesis and Characterization of Al7075, Al7075-10 Vol. % Al2O3 Composite Prepared by High-Energy Ball Milling

Al7075 and Al2O3 powders were synthesized via high-energy ball mill for 15 h. Al7075 powders were mixed with 10 vol. % Al2O3, compacted by cold uniaxial compaction at 400 MPa. The green pellets were degassed at 350 oC for 30 min, and then sintered in the temperature of 600 oC under argon atmosphere for 120 min. It was shown that better density, vickers micro hardness and corrosion resistance were achieved due to refinement of grain size. HRTEM micrographs demonstrated a uniform distribution of Al2O3 particles in aluminium alloy and equilibrium η (MgZn2) precipitates along the grain boundaries.