Moulding method of magnesium alloy ultrathin sheet material

Abstract

The invention discloses a molding method of ultra-thin magnesium alloy plank stuff, which firstly carries out heat preservation of magnesium alloy cast ingots at the temperature of 648 to 688 K for 22 to 25 hours under the protection of inert gases, implements the homogenization treatment of ingot blanks, directly cogs the ingot blanks with heat extrude until the total deformation degree of the heat-extruded and cogged ingot blanks reaches over 40 percent and then implements annealing; the molding method trims the plate blanks after the heat-rolled cogging into required width dimension, implements transverse rolling in a thermal treatment status and controls the heat rolling deformation degree between 20 and 30 percent at the first time, implements longitudinal rolling after the middle annealing, and then implements a plurality of times of transverse rolling, longitudinal rolling, repeated transverse rolling and repeated longitudinal rolling in the thermal treatment status with the assisted middle annealing until the thickness of the plank stuff is 1mm; the molding method implements the cold rolling of the plank stuff with the reduction of 5 percent in each pass, the total deformation degree of the cold rolling between two middle annealing is controlled at 30 percent, and the thickness of the plank stuff after the cold rolling is 0.1mm; the molding method finally implements the flattening and the finishing operation of the plank stuff. The plank stuff produced by the molding method of the invention has tiny crystal grains, even tissue, little defects, lessening cardinal area texture, and improving mechanical, corrosion resistant and electrochemical performance, etc..

Description

technical field [0001] The invention relates to a forming technology of magnesium alloy ultra-thin plates, belonging to the technical field of plate processing and preparation in material processing engineering. Background technique [0002] With the increasingly urgent demand for lightweighting of automobiles, home appliances, office systems, etc. and the environmental protection of the earth, the development and application of wrought magnesium alloys has attracted more and more attention. Experts predict that the magnesium alloy plate market will reach 150,000-200,000 tons in the next 10-15 years. China is a country rich in magnesium resources, with the largest reserves of magnesium ore in the world, a major producer and exporter, and the world's largest output and export volume for nine consecutive years. Products are imported. At present, the minimum thickness of domestically produced wide (>500mm wide) magnesium alloy sheets is only 0.5mm, but some precision elect...

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Problems solved by technology

[0003] The difficulty in preparing magnesium alloy ultra-thin sheets lies in that magnesium belongs to the close-packed hexagonal crystal structure, and its plastic processing performance is poor. The ordinary rolling process cannot prepare magnesium alloy sheets with a thickness below 0.5mm, and the ordinary rolling products have many defects, such as grains, grains, and grains. Boundaries, impurities, excess phases and defects are greatly elongated along the surface, resulting in texture that affects the performance of the sheet, and a large residual stress will also be generated in the sheet

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