Method for preparing fine-grained magnesium alloy with superplastic deformability

Abstract

The invention relates to a method for rolling fine-grained magnesium alloy with superplastic deformability. The method comprises the steps of low-rolling-reduction transverse rolling, high-rolling-reduction longitudinal asynchronous rolling, longitudinal reversed-direction rolling, low-temperature longitudinal rolling and annealing, and comprises the specific steps of heating a commercial magnesium alloy blank in a heating box, standing to preserve heat for a period of time after heating to a preset temperature, firstly pushing the magnesium alloy blank to an entrance of a rolling roller along the transverse direction, carrying out transverse rolling firstly, then, carrying out high-rolling-reduction longitudinal asynchronous rolling, then, carrying out longitudinal 180-degree-reversed rolling, then, carrying out low-temperature longitudinal rolling, and finally, carrying out low-temperature long-time annealing treatment or high-temperature short-time annealing treatment. According to the method, cracking during the rolling of the magnesium alloy can be reduced, the crystal grain of the magnesium alloy is refined, the texture is weakened, and the high-temperature plasticity of the magnesium alloy is improved; moreover, the process is simple and easy to operate, large-sized wide-width sheet materials can be prepared, and the formability of the magnesium alloy is improved remarkably, so that the method is applicable to the mass production of superplastic magnesium alloy and is prone to popularization and application.

Description

Technical field [0001] The invention relates to the field of metal materials, in particular to a rolling preparation method of a fine-grained magnesium alloy with superplastic deformation capability. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering applications. It has light specific gravity, high specific strength and specific rigidity, good damping, thermal conductivity, machinability, casting performance, strong electromagnetic shielding ability, stable size, rich resources, and easy Many advantages such as recycling have been increasingly used in the automotive industry, communications electronics, and aerospace industries. In recent years, the global annual growth rate of magnesium alloy production is as high as 20%, but compared with aluminum containing gold, the forming technology of magnesium alloy needs further development. Rolling is one of the most important processing and forming methods for magnesium alloy sheets...

AI Technical Summary

Problems solved by technology

For the traditional rolling method, due to its completely symmetrical upper and lower roll speeds, roll diameters and surface conditions, a strong basal texture will be produced in the rolled plate, resulting in a large grain size in the material structure, and it is difficult to obtain super Plastic deformation characteristics are very unfavorable to the strength of the plate and subsequent stamping forming, thus limiting its application

At present, the existing methods for preparing fine-grained superplastic magnesium alloys mainly include stack rolling method, spinning method, friction stir modification method, and equal channel extrusion method, etc., which are mainly used to prepare small samples for experiments, and it is difficult to prepare large-sized magnesium alloys. materials, and it is difficult to achieve large-scale mass production

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