A method for preparing low-content magnesium alloys with uniform and fine-grained variable temperature controlled rolling

Abstract

The invention relates to a variable temperature controlled rolling preparation method for makinglow-content magnesium alloys with uniform fine grains. The low-content magnesium alloys are magnesium alloys with the chemical composition mass percentage less than or equal to 5%, such as AZ31, ZX20, ZX10 and AZ21. The variable temperature controlled rolling preparation method for making the low-content magnesium alloys with the uniform fine grains includes three steps of adding trace amounts of grain refining elements, adjusting the grain size through variable temperature rolling and high-temperature short-term recrystallization treatment. According to the variable temperature controlled rolling preparation method for making the low-content magnesium alloys with uniform fine grains, by introducing the trace amounts of refining elements, combined with a variable temperature controlled rolling method, the technical problems that the low-content magnesium alloys are difficult to refine and difficult to deform at the room temperature or below the room temperature are solved, low-content magnesium alloy sheets with the average grain size less than 3 micron are prepared, and an idea is provided for preparation of novel high-performance magnesium alloy plates with the micron grain size in short process and low cost.

Description

technical field [0001] The invention relates to the field of magnesium alloy materials, in particular to a method for preparing low-content magnesium alloys with uniform and fine grains by variable temperature controlled rolling. Background technique [0002] Magnesium alloys are the lightest metal materials for engineering structures. Using magnesium alloys to replace traditional steel materials is an effective way to reduce the weight of automobiles. However, magnesium alloys also have disadvantages such as poor formability and difficulty in meeting service requirements. How to improve the mechanical properties of magnesium alloys is a key problem to be solved urgently in the world. Reducing the grain size can significantly improve the room temperature and high temperature strong plasticity of magnesium alloys, and is currently one of the main methods for high-performance magnesium alloys. However, the current research on grain refinement of magnesium alloys is mainly con...

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Problems solved by technology

[0004] At present, plastic deformation of magnesium alloys is usually carried out under high temperature environment, which not only consumes a lot of energy, but also produces dislocation recovery and grain growth during high temperature deformation, which significantly reduces the grain refinement effect of magnesium alloy materials, as shown in the patent application No. 201410778595.3 discloses a method for preparing a wide-width fine-grained magnesium alloy ultra-thin plate. This patent prepares a magnesium alloy thin plate with an average grain size of less than 20 microns by reciprocating hot rolling of the plate after hot extrusion.

Since the high-temperature heat preservation process will cause the recrystallized grains to grow, only the method of hot rolling cannot make the grains fine enough

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