Study On Microstructure And Mechanical Properties Of Amorphous Particles Reinforced Aluminum Matrix Composites

Aluminum-based composite materials have been widely used in the automotive and aerospace industries due to their light weight,strong ductility,excellent mechanical properties and wear resistance,and good thermal and electrical conductivity.At present,traditional ceramic particles generally reduce the plasticity and machinability of aluminum-based composite materials,and are prone to harmful interface reactions with the matrix,resulting in poor bonding between interfaces.The amorphous alloy has extremely high strength,hardness,as well as good corrosion resistance and wear resistance,and has good wettability and interface bonding with the aluminum substrate.Therefore,in this paper,a new type of amorphous alloy reinforced aluminum matrix composite material was prepared by powder metallurgy,which improved the mechanical properties and corrosion resistance and wear resistance of pure aluminum,thereby expanding its application range.The experimental results are as follows:?1?Al₇₀Ni₁₇Ti₁₃ amorphous powder was prepared by mechanical alloying.The amorphous powder has a large supercooled liquid region??35?T=T_g-T_x?,which indicates that it has high degree of amorphization and good thermal stability.?2?The pure Al matrix composite reinforced by different volume content of Al₇₀Ni₁₇Ti₁₃amorphous particles was prepared by powder metallurgy and hot pressing.With the increase of the volume fraction of amorphous particles,the hardness of the composite increases gradually,and the tensile strength increases first and then decreases.When the volume fraction of Al₇₀Ni₁₇Ti₁₃3 particles is 10%,the maximum tensile strength of the composite is 196.6MPa,which is 113%higher than that of pure aluminum.The microhardness of the composite was increased from 46HV to 195.3HV.?3?The corrosion resistance of Al₇₀Ni₁₇Ti₁₃/Al composites tends to increase first and then decrease with the increase in amorphous content.At 15%,the composite material has the most positive corrosion potential,the lowest corrosion current density,and the best corrosion resistance.The tribological properties of the composite materials have been gradually improved.?4?The pure Al matrix composite reinforced by amorphous particles with different volume contents of Fe₅₂Cr₁₅Mo₂₆C₃B₁Y₃ was prepared by powder metallurgy and hot pressing.With the increase of the volume fraction of amorphous particles,the hardness of the composite increases gradually,and the tensile strength increases first and then decreases.When the volume fraction of Fe based amorphous particles is 15%,the maximum tensile strength of the composite is 234MPa,which is 154%higher than that of pure aluminum.The microhardness of the composite increased from 46HV of pure aluminum to 220.5 HV.?5?The corrosion resistance of Fe₅₂Cr₁₅Mo₂₆C₃B₁Y₃/Al composites first increases and then decreases with the increase of the amorphous content.At 15%,the composite material has the most positive corrosion potential,the lowest corrosion current density,and the best corrosion resistance.The friction properties of composites are best when the amorphous content is 15%.