Experimental And Numerical Simulation Study On Magnesium Alloy Hot Extrusion In Flat Container

Magnesium alloy is a new developing light structural material in the automotive and electronics industries, which has the advantage of low intensity, good electric conduction and transmits heat, high specific strength and stiffness, excellent machinability, and so no. Magnesium alloy extrusion profiles is a so typical represent of high-end magnesium alloy products that the extrusion technology and equipment is one of the focus areas.The method of the finite element analyze is an important method on the researching engineering. Applying the ripe finite element analyze method to the extrusion process, can analyze and study conveniently the characteristic of hot metal deformation, and are helpful to guide the technology and equipment of Magnesium alloys extrusion.Flat container is the most important tool for extruding big, wide, thin-wall, comples and hollow profiles, and also is one key processes of producing big, wide and thin-walled extrude profiles.The results of extrusion experiments show that the extrusion ratio on the AZ31 magnesium alloy extrusion products significantly affect the properties. During extrusion process, more compact and fine equiaxed crystal would be generated by changing extrusion ratio,that can effectively eliminate the coarse grains and segregation in cast alloy.It can also get tighter, smaller recrystallized textus.The tensile strength and elongation of the stipe have improved significantly.The deformation characteristics of the hot extrusion process of AZ31 magnesium alloy strips are analyzed by the combination of 3D FEM simulation and experimentally verification in the first part. The result shows that the evolution of the extrusion in the flat containers can be revealed factually by using 3D FEM simulation, with the high agreement of the numerical simulation and real extrusion test.Finally, flat container extrusion was compared with the conventional one.The results show that the load would be reduced that means that a larger profile extrusion or plate production can be achieved under smaller load. In the extrusion process with flat container,the temperature of billets will be lowered, and metal flow more uniformly that can obtain more uniform microstructure and properties, and increase yield. The end of the extrusion stage is not obvious,and the process is not prone to the shrinkage with higher utilization of billets.