Study On Microstructure And Texture Evolution Of Composite Deformation Of AZ31 Magnesium Alloy Plate

Magnesium alloy is one of the lightest metal materials in the world.It has good properties such as high specific strength,high abrasive resistance,good damping,shock absorption performance,and has good applied prospect.At present,the magnesium alloy is close-packed hexagonal structure,in low-temperature,there is less independent sliding system and plastic deformation capacity is poor,the study of deformation of magnesium alloy and processing methods of magnesium alloy is great significance.In this paper,the complex deformation of AZ31 magnesium alloy under different technological parameters is simulated and experimented,and the following research results are obtained:(1)The coupled deformation of AZ31 magnesium alloy was simulated by DEFORM-3D software.The distribution rules of temperature field,strain field and dynamic recrystallization percentage of magnesium alloy were analyzed during composite deformation.The influence of the pressure,deformation temperature,die pitch and mold tooth height on the magnesium alloy sheet was obtained.(2)The deformation law of the composite deformation process was studied by using the cellular automata method(CA method)in the DEFORM-3D software,the changing rules of the deformation temperature,the die pitch,the die height and the deformation amount on the microstructure evolution were obtained.(3)The mechanical properties of the composite plates were tested.The microhardness,tensile strength and elongation of the samples were compared with those of the original slabs,and the effects of different parameters on the mechanical properties were analyzed.(4)Through the composite deformation experiment on the evolution of sheet metal structure,the results show that the dynamic recrystallization grains are produced in the indentation stage of composite deformation,when the deformation reaches about 20%.The position of the grains changes with the change of the temperature.The average grain size increases with the increase of the pitch,the average grain size is minimum 8?m;the tooth height has little effect on the average grain size,and the grains are uniform when the tooth height is low.(5)The textural strength of composite deformation plate was studied by using EBSD test technology.The textures on the {11 2 0} and {10 1 0} planes are weakly weakened after the composite deformation,and the texture intensity of the {0001} plane varies with the tooth spacing and tooth height The texture intensity decreased by 60%,when the pitch was 6mm.