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Method for preparing high-strength high-toughness magnesium alloy plate strip

A magnesium alloy plate and high toughness technology, applied in the field of magnesium alloy processing, can solve the problems of strength and hardness limiting the use range, affecting the forming ability, increasing production costs, etc., and achieving good industrial application prospects, convenient operation, and energy saving effects.

Inactive Publication Date: 2011-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with them, the low strength and hardness of magnesium alloys seriously limit its scope of application, so it is of great significance to prepare magnesium alloys with high strength and high hardness.
[0003] Special processing technologies for magnesium alloys, such as ECAE, can indeed obtain high mechanical properties, but the prepared materials usually have low ductility, and because the processing materials are limited by the size of the mold, there are many processes, low production efficiency, and high costs. problem difficult to put into industrial application
In addition, age-strengthening wrought magnesium alloys can also improve the strength of wrought magnesium alloys through aging treatment, but a large amount of expensive rare earth elements need to be added, which increases production costs, and the prepared magnesium alloys have high strength, but poor plasticity. Poor, which seriously affects its subsequent molding ability

Method used

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  • Method for preparing high-strength high-toughness magnesium alloy plate strip
  • Method for preparing high-strength high-toughness magnesium alloy plate strip
  • Method for preparing high-strength high-toughness magnesium alloy plate strip

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The AZ91 magnesium alloy with thermal deformation was cold rolled at room temperature, deformed to 8%, and artificially aged at 200 °C. attached by figure 1 It can be seen that the best aging time of the magnesium alloy treated by the process of the present invention is 8-10 hours, and the highest hardness can reach 102Hv, which is nearly 10% higher than that of the traditional direct aging treatment after thermal deformation. After testing, its compressive strength reaches 468MPa, and its maximum compression ratio reaches 13.8%.

Embodiment 2

[0037] Heat the AZ91 magnesium alloy with heat-transformed form in a furnace and heat it to 430°C for 4 hours, then quench it with water, cold roll it to 8% at room temperature, and place it at 200°C for artificial aging. attached by figure 2 It can be seen that the best aging time is 10 hours, and the hardness can reach 101Hv at this time. attached by image 3 It can be seen that this high hardness is mainly due to the large number of twins produced during cold deformation and the large number of fine and dispersed granular second phases that are preferentially precipitated from within and near the twins. It can be seen from Table 1 that the compressive strength and maximum compressibility of the magnesium alloy specimens at this time are 472MPa and 20.2%, respectively, which are greatly improved compared with 413MPa and 14.3% treated by the current method.

Embodiment 3

[0039] Put the thermally deformed AZ91 magnesium alloy in a furnace and heat it to 430°C for 4 hours, then quench it with water, then put it in liquid nitrogen for 15 minutes for cryogenic treatment, then carry out cold rolling, deform it to 8%, and artificially place it at 200°C aging. After aging for 10 hours, the hardness of the magnesium alloy is as high as 110Hv. It can be seen from Table 1 that the compressive strength and maximum compressibility of the magnesium alloy specimen are 488MPa and 15.4%, respectively.

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Abstract

The invention relates to a method for preparing a high-strength high-toughness magnesium alloy plate strip by cold deformation and artificial ageing, comprising the following steps of: placing a magnesium alloy in a thermal deformation state or a solid solution magnesium alloy cooled by water quenching after temperature preservation at the temperature of 400-540 DEG C for 1-15 hours into liquid nitrogen to be subjected to subzero treatment and cold deformation, or directly carrying out cold deformation on the original magnesium alloy in the thermal deformation state or the solid solution state, wherein the deformation is controlled to be 5-20%; and finally preserving the temperature of 100-250 DEG C for 5-100 hours and then carrying out artificial ageing, thus the high-strength high-toughness magnesium alloy is obtained. The method provided by the invention is reasonable in design, the equipment requirement is simple, the operation is convenient, and the problems that the cost is high, a large magnesium alloy is difficult to prepare and large-scale application is difficult to realize in the traditional high-strength high-toughness magnesium alloy preparation process can be effectively solved; and magnesium alloy plate strips with excellent comprehensive mechanical properties such as strength, stretchability and the like, thus the method has a good industrial application prospect.

Description

technical field [0001] The invention discloses a preparation method of a high-strength and high-toughness magnesium alloy plate and strip, in particular referring to the preparation of a high-strength and high-toughness magnesium alloy plate and strip by cold deformation and artificial aging treatment. The invention belongs to the technical field of magnesium alloy processing. Background technique [0002] Magnesium alloy is a lightweight metal material that has attracted much attention at home and abroad. It has broad application prospects in the production of automobiles, aerospace, and electromechanical and electronic products. It is an ideal lightweight alternative material for steel and aluminum alloy materials. However, compared with them, the low strength and hardness of magnesium alloys seriously limit its application range, so it is of great significance to prepare magnesium alloys with high strength and high hardness. [0003] Special processing technologies for m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 杨续跃吴新星姜育培
Owner CENT SOUTH UNIV
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