The invention relates to a large reduction rolling method for
magnesium alloy. According to the rolling method, a hard
alloy lining plate is additionally arranged on the upper surface or the lower surface of the
magnesium alloy, or two hard alloy lining plates are additionally arranged on the upper surface and the lower surface of the
magnesium alloy at the same time, and the added hard alloy lining plates are rolled synchronously together with the
magnesium alloy. The rolling method includes the steps that after a high temperature lubricating agent is evenly smeared on the surfaces of the lining plates and the surface of the
magnesium alloy, the high temperature lubricating agent, the lining plates and the
magnesium alloy are simultaneously placed into a heating box to be heated, after the temperature rises to a preset temperature, standing and
thermal insulation are performed for a certain period of time, one hard alloy lining plate is placed on the upper surface or the lower surface of magnesium alloy blank, or the two hard alloy lining plates are placed on the upper surface and the lower surface of the magnesium alloy at the same time, and the hard alloy lining plates and the magnesium alloy are simultaneously fed into the position between rollers so that rolling can be completed. Through the method, the
single pass reduction of the magnesium alloy can be greatly increased in the rolling process, the number of rolling passes is decreased, magnesium alloy crystalline grains are thinned, the texture is weakened, magnesium alloy plates with high strength and
plasticity are prepared, and the large reduction rolling method for the magnesium alloy is also suitable for the
large deformation rolling process of
titanium,
manganese and
metal-matrix composite materials.