Investigation On Microstructures And Mechanical Properties Of ME10 Magnesium Alloy Sheet With Extrusion-Rolling Process

With many advantages, magnesium alloys are considered as eco-structural metal material in the 21st century and interest many researchers. The advantages of magnesium alloys for industrial and structural applications are their low specific gravity, high specific strength, damping capacity, processability, excellent thermal conductivity and electromagnetic shielding,and recyclability. Wrought alloy should be the brightest star in terms of long-term potential applications. Because wrought products such as plate, stick, pipe and plate, can provide all kinds of sizes and excellent properties (better strength and ductility contrast to casting alloy) by the application of heat treatment and the control of compositions. The wrought products can feed a variety of different needs. Contrast to all other kinds of high strength wrought magnesium alloys; Mg-Mn-Ce series magnesium alloy holds the best comprehensive properties. The anisotropies of extruded-rolling ME10 wrought magnesium alloy were studied In this paper, with methods of commercial extrusion and rolling test, metallographic test, mechanical properties test, SEM test . The effects of different annealing processes and rolling methods on anisotropies of extruded-rolling ME10 wrought magnesium alloy were understudied.The results show that strength of extruded ME10 magnesium alloy are slightly improved after different annealing. However, the effect of annealing on elongation value of the extruded ME10 magnesium alloy is found to be significant. The highest elongation value was achieved at 623K for 4 hours and air-cooled which is benefit to the following rolling. The extruded ME10 magnesium alloy was successfully rolled under proper condition. Anisotropies of microstructures and properties were existed on extruded-rolling ME10 magnesium alloy. The strength of transverse direction of extruded-rolling ME10 magnesium alloy is higher than that of rolling direction. However, the anisotropy can be improved significantly after annealing. Extruded-transverse direction rolling was benefit to reduce the strength anisotropy of ME10 wrought magnesium alloy sheet, while extruded- longitudinal rolling was benefit to reduce the elongation anisotropy of ME10 wrought magnesium alloy sheet. The best improvement of anisotropy was achieved at 603K for 1 hour and air-cooled. For extruded-longitudinal rolling sheet, the best improvement of elongation anisotropy with elongations of 11.6 %( RD) and 11.1 %( TD) respectively, could be obtained after annealing at 603K for 1 hour. For extruded-transverse direction rolling sheet, the best improvement of strength anisotropy with tensile strength of 234MPa (RD) and 239MPa (TD) respectively, could be obtained after annealing at 603K for 1 hour. As annealing after rolling can greatly improve the anisotropy of mechanical properties, rolling direction can be chosen according to the actual situation.