Fe-based Amorphous Particles Reinforced Aluminum-based Composite Materials

The new era is constantly improving,technology have also been greatly improved.In order to keep up to date,the field of materials is also accelerating,and new high-strength lightweight materials have emerged.aluminum matrix composites have excellent properties such as high strength and low density,which is in line with the demand for new materials.Therefore,aluminum-based composite materials are called the focus of research in today's application fields.In this paper,the Fe-based amorphous reinforced aluminum matrix composites prepared by mechanical alloying and spark plasma sintering were characterized by XRD,DSC,SEM,EDS and other characterization methods,and the mechanical properties were tested to determine their corresponding enhancement mechanism and its influence.factor.(1)The amorphous phase of Fe-based amorphous reinforced aluminum matrix composite powder with different volume enhancement ratio after ball milling was determined by XRD.The sintering temperatures of Fe-based amorphous reinforced aluminum matrix composites with different volume enhancement ratios determined by DSC were 400?,450?,500?,and 550?,respectively.Among them,400? and 450?,500? is below the amorphous glass transition temperature;550? is in the supercooled liquid region.The distribution of the reinforcing phase was determined by SEM to determine whether agglomeration occurred and the interfacial bonding was observed.EDS is used to determine if a second phase enhancement occurs and the element distribution.(2)When the reinforcement ratio is the same,the higher the sintering temperature of the Fe-based amorphous reinforced aluminum matrix composite,the better the density of the sample,and the density reaches 97.6% at 500?;when the composite volume fraction is 10%.At the time,the composite structure has fewer structural defects and high density.(3)Analysis of the results of compression experiments found that the yield strength and elastic modulus of Fe-based amorphous reinforced aluminum matrix composites with the same volume-enhanced ratio increase below 500? with increasing temperature,and the yield strength and elastic modulus are The volume ratio of 40% of the sintering temperature of 550? reached a peak of 396 MPa and 104.81 GPa,but the fracture phenomenon occurred at 10% strain,and the plasticity was seriously degraded.(4)For the Fe-based amorphous reinforced aluminum matrix composites with the samesintering temperature,except for the sintering temperature of 550?,the yield strength and elastic modulus increase the yield strength and elastic modulus with the enhancement ratio above 10 vol.%.The amount gradually decreased and peaked at 10 vol.%.(5)The compression test was carried out to determine the sintering temperature of 500?,the volume fraction of 10 vol.% Fe-based amorphous reinforced aluminum matrix composite material has higher yield strength 276 MPa and elastic modulus than other sintering temperature and volume enhancement ratio materials.The amount is 78.17 GPa and at the same time has good plasticity.By analyzing the SEM and EDS spectra of the samples and corresponding to their mechanical properties,the enhancement mechanism is the mixing enhancement mechanism of particle reinforcement,dislocation enhancement,fine grain strengthening and element diffusion to form the second phase.(6)In the finite element simulation,the mechanical properties of Fe-based amorphous reinforced aluminum matrix composites with larger thickness of precipitated phase are better.The analysis result may be that the precipitation phase forms a second phase enhancement effect at the interface,thereby enhancing the yield strength and elastic modulus of the composite.When the reinforcing phase is small,since the content of the reinforcing phase is insufficient to bear more deformation variables,the Al matrix mainly bears deformation,so that the mechanical properties are poor.When the reinforcing phase is more,the reinforcing phases interact with each other to concentrate the stress,which in turn affects the mechanical properties.Therefore,when the reinforcement ratio is 10%,the matrix is subjected to the least stress,the stress concentration region is the least,the elastic modulus is the largest,and the mechanical properties of the Al-based composite material are the best.