| Because of their low density, high specific strength, superior damping capacity, and other good advantages, magnesium alloys are gaining increasing importance for structural applications. Unfortunately, due to their hexagonal close-packed crystal structure, however, Mg alloys usually present limited workability at room temperature. In addition, most Mg alloys suffer from relatively low mechanical strength as compared with other competing materials such as Al alloys. Therefore, improvement of their mechanical strength and ductility is in great need of. In the present paper, we mainly research on the cold rolling process of AZ40 magnesium alloy sheets, especially on the thin Mg alloy sheets. As a result, the optimized rolling parameters of the alloy sheets are obtained and the mechanical properties of the products are improved. The thin Mg alloy sheets which were produced as the process we summarized that are suitable for the manufacture of complex parts with thin-walled geometries.The as-cast AZ40 magnesium alloy plate ingots of 12mm in thickness was used as the starting material for hot rolling. Then the ingots were reduced to be 3mm, 1.8mm, 1.2mm and 0.9mm in thickness by different hot rolling process respectively. It was proved that the Mg alloy sheets which were 1.8mm and 1.2mm in thickness were with a better combination property. And then the cold rolling process of 12mm, 3mm and 1.8mm Mg alloy sheets were studied. It was concluded that with the thickness of the hot-rolled alloy was reduced, the Mg alloy sheet got a better cold-rolled property. At last, we mainly researched on the cold rolling process of 1.8mm and 1.2mm Mg alloy sheets with different intermediate annealing process. The intermediate annealing process was set as annealed at 250℃for 30 min. As a consequence we found that after 5 passes of intermediate annealing process, the 1.2mm Mg alloy sheet could be reduced to be 0.29mm in thickness. And the thin Mg alloy sheet we got with a good combination property met our need. |
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