Microstructure and Mechanical Properties of TiB2 Particles Reinforced 6061 Aluminum Alloy
TiB2 particles have a good strengthening effect on aluminum alloys.TiB2/6061 composites were prepared by ultrasound-assisted remelting and dilution method,and the effects of TiB2 particles on the microstructure and mechanical properties of 6061 aluminum alloy in as-cast and extruded+T6 heat-treated states were investigated.The results show that after adding 2wt%TiB2 particles,the average grain size of the as-cast aluminum alloy is refined from 355.7 μm without adding TiB2 to 117.5 μm.TiB2 particles can promote nucleation and inhibit grain growth in recrystallization process.The yield strength of the extruded+T6 heat-treated TiB2/6061 composites is 330 MPa,and the ultimate tensile strength is 385 MPa,which increases by 11.8%and 7%compared with that of the alloy without TiB2 addition,respectively.The main types of reinforcement are thermal mismatch reinforcement and Orowan reinforcement.
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