Property study of Al2O3/TiB2 particle hybrid reinforced aluminum matrix composite by in-situ synthesis
This study aims to develop a novel aluminum matrix composite material that enhances surface hardness while maintaining its electrical and thermal conductivity properties to meet the demands of industrial and civilian applications,given the inadequacies of traditional aluminum alloys.Through mechanical alloying,Al-TiO2-B hybrid powders were prepared,and an in-situ synthesis of Al2O3/TiB2 particulate hybrid-reinforced aluminum matrix composite material was achieved using exothermic dispersion bonding contact reaction technique.The research investigates the reaction mechanism of the Al-TiO2-B system to generate Al2O3/TiB2 particulate hybrid-reinforced aluminum matrix composite material and the influence of reaction temperature on in-situ reaction.Microstructural morphology,surface microhardness,and electrical and thermal conductivity properties of the alu-minum matrix composite material were studied.XRD analysis revealed that at a reaction temper-ature of 1 100 ℃ and a holding time of 200 minutes,complete reaction of TiO2 and B powders in the Al-TiO2-B system occurred,with B powder inhibiting the formation of intermediate products Al3Ti and A1B2 during the reaction process,resulting in the in-situ generation of Al2O3 and TiB2 particulate hybrid-reinforced aluminum matrix composite material.Microstructural observation demonstrated the in-situ generation of TiB2 particles(diameter less than 1 pm)and Al2 O3 parti-cles(approximately 2 pm in diameter)within the aluminum matrix,with a uniformly dense sur-face structure of the aluminum matrix composite material.The electrical conductivity of the in-si-tu synthesized Al2O3/TiB2 hybrid particle-reinforced aluminum matrix composite material was 46.1％IACS,and the thermal conductivity was approximately 198.5 W·m-1·K-1,with the mi-crohardness increasing from 68 HV(for traditional A356 aluminum alloy)to 76 HV.This novel in-situ synthesized aluminum matrix composite material enhances microhardness while ensuring electrical and thermal conductivity properties.
in situ synthesisaluminum matrix compositeAl2O3/TiB2hybrid particle reinforce-ment
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