Study On Rolling Process And Interface Characteristics Of Mg/Al/Ta Composite Plate

In order to avoid the interference and damage of high-energy cosmic rays to the electronic components in the detector,the future space exploration needs better radiation resistant materials,among which magnesium tantalum composite is an important option.However,magnesium tantalum composite plates have characteristics such as difficulty in composite,complex forming process,and poor mechanical properties.Conducting research on the forming process of magnesium tantalum composite plates is of great significance for achieving their engineering and large-scale production.This project uses aluminum layer metal as the transition metal,and successfully prepares Mg-Al-Ta composite materials through room temperature cold rolling test process.At the same time,the rolling temperature is optimized to prepare Mg-Al-Ta composite plates with better mechanical properties under medium temperature rolling at 170℃.The effects of rolling temperature,rolling passes,rolling reduction,and annealing temperature on the interfacial diffusion and mechanical properties of Mg-Al-Ta composite plates were studied.Scanning electron microscopy,energy dispersive spectroscopy,XRD and other microstructure research methods were used,as well as hardness testing,tensile testing and other mechanical performance tests to characterize the element diffusion at the Mg-Al-Ta composite interface and the mechanical properties of the composite plate.The results indicate that under the room temperature cold rolling process,the macroscopic morphology of the Mg-Al-Ta composite sheet exhibits significant plastic deformation.The rolling pass has a significant impact on the interface bonding.From successfully rolling at 60%reduction in the first pass to continuing rolling at 25%reduction in the second and third passes,the atomic diffusion width at the Mg-Al interface of the rolled sheet increases from 3.48μm increased to 4.06μm and 4.74μm.With the increase of rolling passes,the tensile strength of the composite plate is 110MPa,52MPa,and 39MPa,respectively,and the elongation decreases with the increase of rolling passes.The atomic diffusion width at the Mg-Al interface of the annealed sheet increased from 4.74 μm increased to 7.0μm.Under the medium temperature rolling process at 170℃,the macroscopic surface of the Mg-Al-Ta composite material is relatively flat,and the bonding at the interface is good.The diffusion width of Mg-Al and Al-Ta interfaces increases with the increase of rolling passes.In 1-5 passes of rolling,the diffusion width of Al-Ta interface increases from 1.2μm increased to 5.18μm.The diffusion width of the Mg-Al interface is 2.38μm increased to 4.25μm.The hardness of the interface layer gradually increases.The tensile strength of Mg-Al-Ta layered composite plates increases with the increase of rolling passes,and the tensile strength of the plates rolled in 2 and 5 passes reaches 293 and 365MPa,respectively.The elongation of composite plates with different rolling passes is less than 1%.Al3Ta solid solution appeared at the interface of Mg-Al-Ta bonding during diffusion heat treatment.