Synthesis and characterization of Al7075, Al7075-10 vol. Al_2O_3 composite prepared by high-energy ball milling

摘要

Al7075 and Al_2O_3 powders were synthesized via high-energy ball mill for 15 h. Al7075 powders were mixed with 10 vol. % Al_2O_3, compacted by cold uniaxial compaction at 400 MPa. The green pellets were degassed at 350°C for 30 min, and then sintered in the temperature of 600°C 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 Al_2O_3 particles in aluminium alloy and equilibrium η(MgZn_2) precipitates along the grain boundaries.