Study On Large Strain Rolling And Mechanical Behavior Of AlMgSiCu Alloy

AlMgSiCu alloy has been widely used in aeronautics,rail transportation,automobile,shipbuilding and building materials because of its merits such as light weight,high strength,easy forming and good corrosion resistance.At present,in order to improve the mechanical properties of AlMgSiCu alloy sheet at the same time,the aluminum profile of vibration and noise reduction and sound insulation problems put forward higher requirements.Therefore,according to the demand of AlMgSiCu alloy,based on the existing properties of AlMgSiCu alloy,combined with the actual production and testing conditions,through the study of rolling technology,different alloying elements,heat treatment process on alloy sheet mechanical properties and damping characteristics,Microstructure,mechanical properties and damping characteristics of the impact of law,so as to optimize the process parameters for the actual production of guiding significance.The results are as follows:(1)Elimination of as cast dendrite segregation by homogenization treatment.There are a large number of coarse dendrites in the as-cast microstructure of Al-Mg-Si-Cu alloy.Afterhomogenizing treated at 560 ? for 24 h,the non-equilibrium phase in the microstructure is dissolved almost,the crystalline grain is refined and the hardness value of the alloy is the highest,the tensile strength is 204 MPa,the yield strength is 187 MPa and the elongation is 8.5%.(2)The large strain rolling test of AlMgSiCu alloy is carried out.According to the research,the rolling speed,deformation and rolling temperature of rolling process are investigated.The three factors are further explored.The rolling speed has a significant effect on the hot deformation microstructure of AlMgSiCu alloy.After 400 degree hot rolling?10s-1speeding and solid solution aging,the alloy properties of AlMgSiCu alloy increased obviously,the hardness reached 103.3HV at this time,the tensile strength reached 350 MPa and the elongation reached 35.5%.(3)Reasonable optimization of the content of major alloying elements and appropriate adjustment of the content of trace elements can effectively improve the strengthening effect and improve the microstructure and mechanical properties of AlMgSiCu alloy.In order to improve the mechanical properties of alloy,The tensile strength of AlMgSiCu alloy increases with the increase of Zr content,and the tensile strength is up to 490 MPa when the Zr content is 0.7%;the grain size of the AlMgSiCu alloy is refined to a certain extent by increasing the content of Er to increase the tensile strength The mechanical properties of the alloy were improved obviously when the content of Mn was 0.7% Mn and the grain size of the grain was retarded by pinning the grain boundaries.Tensile strength reaches 493 MPa.Zr,Mn elements can significantly improve the microstructure and mechanical properties of AlMgSiCu alloy.(4)Through the determination of modulus and damping value,the sound attenuation and noise reduction performance of alloy is determined.The damping values under different processes are different.Find the law,generally speaking The main damping source of AlMgSiCu alloy is the internal damping of material,and the influence of temperature and frequency on damping of alloy is different.The damping value of the AlMgSiCu alloy is higher than that of the AlMgSiCu alloy.The dislocation density of the AlMgSiCu alloy is much more than that of the AlMgSiCu alloy after rolling.However,the damping characteristics of AlMgSiCu aluminum alloy have the same rule after heat treatment.The elastic modulus decreases linearly with the increase of temperature,and the effect of frequency on alloy damping is different at room temperature and high temperature...