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Extrusion deformation process of high-strength magnesium alloy thick plate

A technology for extrusion deformation and magnesium alloys, which is applied in the field of extrusion deformation involving magnesium alloys, and can solve the problems of lack of large-scale high-performance magnesium alloy sheets, low symmetry, and low strength.

Inactive Publication Date: 2012-01-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The application of magnesium alloys on large structural parts is the future application trend. However, large-scale and high-strength deformed magnesium alloy materials in my country are still in the laboratory development stage. The strength of currently used magnesium alloys is lower than 350MPa, and there is a lack of large-scale high-performance magnesium alloy plates. In particular, magnesium alloy plates with a strength above 400MPa are still in the blank in my country.
[0003] Magnesium has a close-packed hexagonal crystal structure, low symmetry, axial ratio (c / a) value of 1.623 (close to the ideal close-packed value of 1.633), less slip system at room temperature and low temperature, poor plastic deformation ability, low strength, serious Limit the application of magnesium alloy

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  • Extrusion deformation process of high-strength magnesium alloy thick plate
  • Extrusion deformation process of high-strength magnesium alloy thick plate
  • Extrusion deformation process of high-strength magnesium alloy thick plate

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Embodiment 1

[0019] In this embodiment, a magnesium alloy semi-continuous casting billet (specification: Φ210mm, length greater than 5000mm) is used. After extrusion, the specifications of the plate are: width 150mm, thickness 20mm, length 3000mm, and the inner diameter of the extrusion cylinder is 205mm.

[0020] First, homogenize the magnesium alloy billet at 455°C / 5h+545°C / 15h, quickly cool it and peel it off; then heat the extrusion die and extrusion barrel at a temperature of 450°C, and then heat the magnesium alloy billet to 460°C After being kept at ℃ for 2 hours, put it into the extrusion cylinder, and extrude it on a 3600-ton horizontal hydraulic press with an extrusion ratio of 11; the optical microstructure of the extruded alloy is as follows: figure 1 It can be seen from the optical microstructure of the extrusion longitudinal section that complete dynamic recrystallization occurred during the extrusion process, and the grain size is about 13.5 μm; the macroscopic picture of the...

Embodiment 2

[0022] In this embodiment, a magnesium alloy semi-continuous casting billet (specification: Φ210mm, length greater than 5000mm) is used. After extrusion, the specifications of the plate are: width 150mm, thickness 20mm, length 3000mm, and the inner diameter of the extrusion cylinder is 205mm.

[0023] First, homogenize the magnesium alloy billet at 455°C / 5h+545°C / 15h, quickly cool it and peel it; then heat the extrusion die and extrusion barrel at a temperature of 400°C, and then heat the magnesium alloy billet to 390 After being kept at ℃ for 2 hours, put it into the extrusion cylinder, and extrude it on a 3600-ton horizontal hydraulic press with an extrusion ratio of 11; the optical microstructure of the extruded alloy is as follows: figure 1 As shown, it can be seen from the optical microstructure of the extrusion longitudinal section that complete dynamic recrystallization has occurred during the extrusion process, and the grains are fine, and the grain size is about 8 μm. ...

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Abstract

The invention relates to an extrusion deformation process of a high-strength magnesium alloy thick plate. The alloy comprises the following components in percentage by weight: 6 to 13 percent of Gd, 2 to 6 percent of Y, 0.3 to 0.8 percent of Zr and the balance of Mg and inevitable impurity elements. When the magnesium alloy is adopted to cast a blank semi-continuously, the extrusion process comprises the following steps of: homogenizing the alloy blank, quickly cooling the alloy blank, peeling off the alloy blank, heating an extrusion die to 340 to 450 DEG C, heating the alloy blank to 350 to460 DEG C, keeping the temperature for 1 to 3 hours, and extruding the alloy blank on a 1,800T / 3,600T horizontal oil hydraulic machine, wherein the extrusion ratio is 11-15.The specifications of the extruded plate include: the thickness is 10 to 35mm; the width is 50 to 80mm; and the length is more than 2,000mm. After extrusion and isothermal aging treatment, the tensile strength of the alloy is more than 460MPa, the yield strength is more than 390MPa and extension rate is more than 3 percent. The demands of the fields, such as transportation or freight tools, communications and electronics, aviation and the like, for the high-strength magnesium alloy can be satisfied; and the application range of the magnesium alloy is widened.

Description

technical field [0001] The invention relates to the field of extrusion deformation of magnesium alloys, in particular to an extrusion deformation process of high-strength magnesium alloy thick plates. Background technique [0002] Magnesium alloy is the lightest available metal structure material, which has the advantages of low density, high specific strength, good thermal conductivity, strong shock absorption capacity, easy cutting, recyclable and dimensional stability, etc. It is used in automobiles, electronic communications, aerospace and national defense And other fields have extremely important application value and broad application prospects, known as "green engineering materials in the 21st century". Magnesium is one of the most abundant elements on the earth. Today, many important metals tend to be depleted, and accelerating the development of magnesium alloy metal materials is one of the important measures to achieve sustainable development. Compared with cast m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06B21C23/02C22F1/06
Inventor 刘楚明万迎春高永浩李展志李慧中
Owner CENT SOUTH UNIV
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