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The paper have mainly carried out preparation process of lower than 0.1mm magnesium alloy foil,using AZ31B magnesium alloy extrusion sheet as a raw material.We try to study the different hot rolling temperature, pass deformation, rolling method and annealing processes in the experiment,using in-rolling, vertical rolling, cross-rolling, accumulative rolling and 300℃,350℃,400℃,450℃heat rolling temperatures to make comparative tests.We gain the production parameters of 0.04mm magnesium alloy foil. The original board homogenization anneals in 12 hours by the way of vertical rolling, holding 5 min between every pass at the temperature is 400℃, and pass reduction rate is 10% to 15%.We adopt two sheets rolling together when the plate is 0.3mm, four sheets when the plate is 0.15mm, eight sheets when the plate is 0.07mm. Every accumulative rolling pass reduction is 50%, heavy reduction produced grain refinement.In order to overcome the surface adhesion phenomenon between magnesium alloy thin plates, Al2O3 nano powder was employed to form surface coating during the accumulative rolling experiment, and the microstructure of the magnesium alloy foil was investigated by OM, SEM and TEM as well as the tensile test.Annealed at 400℃, the microstructure is essentially composed by a fine equiaxed grains, grain size tends to uniformity,0.5mm magnesium alloy average grain size is 11μm, and the tensile strength and elongation are the largest, respectively, 446MPa and 16.1%.AZ31B mechanical properties of magnesium alloy sheet is the best at 400℃annealing.Fir the magnesiul alloy foil at 0.04mm thickness after finish rolling, the average grain size is 3.7μm, and meanwhile the yield strength and tensile strength were 524MPa and 675MPa, elongation rate 1.41%, respectively.
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