Study On The Preparation And Mechanical Properties Of Fe-based Amorphous Alloy Particles Reinforced Aluminum-based Composites

Amorphous alloy?also known as Metallic Glass,MG?,which has excellent properties such as high strength,high hardness,wear resistance and corrosion resistance.The coefficient of thermal expansion between metallic glass and metal matrix is similar,and the interface between metallic glass and metal matrix is well.In recent years,metallic glass reinforced aluminum matrix composites have become the research hotspot.In this paper,Fe₅₀Cr₂₅Mo₉C₁₃B₃ metallic glass?FMG?particles reinforced Al matrix composites were prepared by powder metallurgy method.The effects of the contents and characteristics of metallic glass particles on the morphology,microstructure,interface bonding and mechanical properties of the composites were studied,and the related mechanisms were discussed.First,the influence of the content of Fe-based metallic glass particles on the microstructure and mechanical properties of Al-based composites was studied.The aluminum matrix composite powders reinforced with different contents of Fe-based metallic glass particles were prepared by ball milling,and then the bulk composites were prepared by combining spark plasma sintering?SPS?with hot rolling.The microstructure and mechanical properties of the prepared composites were characterized.The results show that by controlling the process parameters in the spark plasma sintering and hot rolling processes,Fe-based metallic glass particles with core-shell structure were obtained in the composites,where the core structure was Fe-based metallic glass and the shell structure contained three different areas.The tensile test results of the composites show that the ultimate tensile strength of aluminum matrix composites reinforced by 10 vol%,20 vol%,30 vol%,and 40 vol%Fe-based metallic glass particles were increased from 126 MPa for pure aluminum to178 MPa,199 MPa,215 MPa and 248 MPa.The tensile strength of the composites has been greatly improved,and it also has acceptable ductility.This is mainly because the formation of core-shell structure of Fe-based metallic glass particles improves the interfacial bonding,transfers the load carried by the tensile process from the matrix to the Fe-based metallic glass particles,and improves the mechanical properties of the composites.Carbon nanotubes?Carbon Nanotubes,CNTs?are also considered to be ideal reinforcements for aluminum matrix composites due to their light weight and high strength.Based on the above studies,CNTs were grown on the surface of Fe-based metallic glass particles by chemical vapor deposition method in this paper,and the CNT-FMG hybrid reinforcements were prepared to achieve the uniform distribution of CNTs in aluminum matrix.The preparation method of the CNT-FMG hybrid reinforced aluminum matrix composite is the same as that of the Fe-based metallic glass reinforced aluminum matrix composite.The results showed that ideal CNTs were obtained on the surface of Fe-based metallic glass particles coated with 2 wt%Ni catalyst particles.The catalytic condition is 600?for 30 min.From the observation of tensile fracture and interface microstructure of the composite,it is found that the interface bonding of three phases is well.The tensile strength of 40 vol%CNT-FMG/Al composite reaches 284 MPa.Compared with the same content of Fe-based metallic glass particles reinforced aluminum matrix composite,the mechanical properties of CNT-FMG hybrid reinforced aluminum matrix composite have been improved,which indicates that the strengthening effect of CNT-FMG hybrid reinforcement is better.CNT and FMG work together to significantly improve the mechanical properties of aluminum matrix composites.