Study On Indentation-flattening Compound Deformation Of AZ61 Magnesium Alloy

Magnesium alloy has the advantages of low density,high specific strength,good anti-damping performance,and good electromagnetic shielding performance.It is widely used in aviation,aerospace,automobile manufacturing and 3C electronics.However,the poor plastic deformation ability and low strength of magnesium alloy materials have seriously hindered the comprehensive utilization of magnesium alloys.Therefore,the development of high-performance magnesium alloy materials has become an important research direction in the field of magnesium alloys.This paper uses numerical simulation and experimental methods to study the microstructure evolution and mechanical properties of AZ61 magnesium alloy after indentation-flattening composite deformation,and has obtained the following research results:(1)The finite element simulation method is used to analyze the indentationflattening composite deformation of magnesium alloy sheet.The research shows that as the reduction amount increases,the deformation temperature increases,the grain structure is significantly refined,and the composite deformation temperature increases The lower the stress,the larger the recrystallized grain size.(2)Experimental research on the indentation-flattening composite deformation of AZ61 magnesium alloy.The experimental results show that when the deformation temperature is 360 °C and the reduction is 5mm,the average grain size is 14μm,compared with the original sheet grain with a size of 37μm,the grain size was refined by 62%.(3)The mechanical properties of the AZ61 magnesium alloy sheet after composite deformation are tested.The results show that when the tooth spacing is 8mm and the reduction is 5mm,the tensile strength reaches 341 MPa,the yield strength is 329 MPa,and the elongation is 17.9%.Compared with the original data,the tensile strength is increased by 12%,the yield strength is increased by 17%,and the elongation is increased by 4%.The composite deformation method can significantly improve the mechanical properties of magnesium alloy materials.(4)Using EBSD technology to study the texture strength of AZ61 magnesium alloy after composite deformation,the results show that the texture strength decreases with the increase of the deformation temperature,and gradually increases with the increase of the reduction,when the deformation temperature is at 320 ℃,the tooth pitch is 8mm,and the reduction is 3mm,the texture strength is 8.78,which is 51% weaker than the original texture of 17.87.