Methods of regulating grain structure and improving properties of zk60 wrought magnesium alloy

A technology for deforming magnesium alloys and grains, applied in the field of deformed magnesium alloys, can solve problems such as increasing the manufacturing cost of materials, increasing the size of magnesium alloy profiles, and difficult to solve core problems.

Inactive Publication Date: 2021-03-02
QILU UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the inventors found that the strength of the magnesium alloy profile is only about 320MPa under the existing process conditions, which is still significantly lower than that of high-strength steel and aluminum alloy. Therefore, it is necessary to increase the cross-sectional size of the profile to meet the material quality requirements and ensure the structure when manufacturing passenger car structural parts. long-term service security
However, increasing the size of the profile will make it impossible to fully utilize the low-density advantages of magnesium alloys, and greatly weaken the weight reduction effect of ZK60 magnesium alloys
At the same time, increasing the size of magnesium alloy profiles will also significantly increase the difficulty of profile manufacturing and seriously increase the cost of material manufacturing
Therefore, it is difficult to solve the core problems of the popularization and application of ZK60 magnesium alloy in new energy buses and the goal of lightweight vehicles

Method used

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  • Methods of regulating grain structure and improving properties of zk60 wrought magnesium alloy
  • Methods of regulating grain structure and improving properties of zk60 wrought magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The method for preparing ZK60 wrought magnesium alloy comprises the following steps:

[0037] 1) Melting: heating pure magnesium, pure zinc and Mg-Zr master alloy to 700-750°C for 20-30 minutes. After the alloy is completely dissolved, stir fully to make the raw material fraction uniform, then keep it for 20-30 minutes, and then cast it into an ingot to obtain ZK60, wherein the content of the main elements in the alloy is: 5.8wt% Zn, 0.5wt% %Zr, the balance is Mg

[0038] 2) Machining: sawing the ingot, machining the wagon to a suitable size.

[0039] 3) Solution treatment: heat the ZK60 magnesium alloy of appropriate size in step 2) at 400° C. for 10 hours, and then quench to room temperature.

[0040] 4) Pre-aging treatment: The solution-treated ZK60 magnesium alloy is subjected to a stepwise pre-aging process. The process is divided into three stages: aging at 120°C for 60 minutes, aging at 180°C for 30 minutes and aging at 240°C for 15 minutes.

[0041] 5) Extrus...

Embodiment 2

[0044] In this embodiment, the difference between the preparation method of the ZK60 deformed magnesium alloy and the embodiment 1 is that in step 3) the pre-aging treatment is not performed after the solution treatment, and the extrusion treatment is directly performed. The metallographic microstructure of the prepared ZK60 wrought magnesium alloy is as follows: figure 1 As shown in b, its SEM structure is as figure 2 As shown in b, the test results of its mechanical properties are shown in Table 2.

Embodiment 3

[0046] In this example, the difference between the preparation method of the ZK60 wrought magnesium alloy and Example 1 is that a one-stage pre-aging treatment is performed after the solution treatment in step 3), and the pre-aging treatment process is: aging at 240°C for 15 minutes, and then extrusion pressure treatment. The metallographic microstructure of the prepared ZK60 wrought magnesium alloy is as follows: figure 1 As shown in c, its SEM structure is as figure 2 As shown in c, the test results of its mechanical properties are shown in Table 2.

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Abstract

The invention relates to the technical field of wrought magnesium alloys, and specifically provides a method for regulating and improving the grain structure of ZK60 wrought magnesium alloys. The method of the invention comprises that after the ZK60 wrought magnesium alloy to be treated is subjected to solid solution treatment, the stepwise heating and pre-aging treatment is carried out, and then the extrusion treatment is carried out. This method can effectively control the grain size of ZK60 magnesium alloy by adding stepped pre-aging treatment, significantly improve the strength and plasticity of the material, fully exploit the advantages of low density and high specific strength of ZK60, and realize the promotion and application of ZK60 magnesium alloy in new energy buses. And the core problem of the lightweight goal of automobiles, laying the foundation for the promotion and application of ZK60 magnesium alloy in new energy buses.

Description

technical field [0001] The invention relates to the technical field of deformed magnesium alloys, in particular to a method for regulating and improving the grain structure of ZK60 deformed magnesium alloys. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] In recent years, while the automotive industry has achieved rapid development in the fields of structural design, parts manufacturing and assembly, it has also caused a series of problems such as energy waste and environmental pollution. In order to alleviate the increasingly serious energy and environmental problems, it is mainly achieved through lightweight vehicles, that is, reducing vehicle weight, reducing energy co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/06
CPCC22F1/002C22F1/06
Inventor 孟祥斌周吉学林涛吴建华张素卿赵国辰
Owner QILU UNIV OF TECH
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