Research On Magnesium-lithium Alloy Electric Heat Treatment And Extrusion Process Of Cylindrical Parts

With the increasing demand for lightweight alloys in my country's aerospace manufacturing industry,magnesium-lithium alloys have gradually shown an unparalleled trend due to their low density,high specific strength,and high elastic modulus.However,the current relative insufficiency of research on performance enhancement and plastic forming technology of magnesium-lithium alloys has limited the wide application of magnesium-lithium alloys in the field of engineering manufacturing.Based on this,this paper puts forward the research of magnesium-lithium alloy electric heat treatment and the extrusion forming process of cylindrical thin-walled parts.The research of this article mainly includes the following aspects:First,the extruded LAZ931 magnesium-lithium alloy is subjected to traditional heat treatment and electric heat treatment at the same temperature,and modern advanced material analysis methods are used to characterize the microstructure and dislocation density of the sample before and after the heat treatment.The tensile test tests the mechanical properties of the material before and after heat treatment.The results show that the change trend of the mechanical properties of materials after traditional heat treatment is the increase in tensile strength at the expense of elongation reduction,while the tensile strength and elongation of the samples after electric heat treatment have a trend of simultaneous increase in tensile strength and elongation.Through the study of the microstructure and dislocation density of the material before and after heat treatment,it is found that the improvement of the mechanical properties of the material after the electric heat treatment comes from the spheroidization of the?-Mg phase and the recrystallization of the ?-Li phase in the magnesium-lithium alloy and the dislocations in the material.The combined effect of density decline.Second,the as-cast LAZ931 magnesium-lithium alloy is subjected to Glebble thermal compression deformation under different deformation conditions,and the thermal deformation behavior of the magnesium-lithium alloy is determined by analyzing the flow stress of the material during the deformation process,and the constitutive relationship model of the material is completed and passed The Z parameter verifies the validity of the constructed model.In addition,a mathematical model of dynamic recrystallization of LAZ931 magnesium-lithium alloy is constructed by studying the microstructure of the material after deformation,which provides a reference for the process of numerical analysis.Finally,the forming device and process flow are designed according to the characteristics of the component to be formed;the two predetermined forming schemes are numerically analyzed through ABAQUS,and the deformation of the material and possible defects during the forming process are predicted to select the best forming scheme.And complete the forming of cylindrical parts to verify the feasibility of the process.The performance analysis of the formed component shows that the performance of the material after extrusion has a certain degree of improvement,mainly from the optimization of the structure during the extrusion process.