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Short-flow preparation method for high-performance Mg-Zn-Zr alloy

A high-performance, short-flow technology, applied in metal processing equipment and other directions, can solve the problems of small workpiece size, low feasibility of industrialized mass production, and long production cycle.

Inactive Publication Date: 2018-09-18
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, large plastic deformation has attracted much attention as one of the processing methods of high-performance magnesium alloys. However, the size of the workpiece processed by this method is small, and it usually needs to be homogenized before thermal processing. The product production cycle is long, and industrial mass production is feasible. lower sex

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  • Short-flow preparation method for high-performance Mg-Zn-Zr alloy
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  • Short-flow preparation method for high-performance Mg-Zn-Zr alloy

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Embodiment 1

[0026] For the Mg-2Zn-0.45Zr alloy selected in this embodiment, the length, width, and height of the sample before hot working are 70 mm, 70 mm, and 80 mm, respectively.

[0027] A high-performance Mg-Zn-Zr alloy short-process preparation method includes the following steps:

[0028] 1) Casting process: Prepare Mg-2Zn-0.45Zr alloy melt according to the magnesium alloy smelting method, and pour the melt into a square water-cooled copper mold. The molding size of the copper mold is 150mm*150mm*150mm, and the mold cooling water capacity is 300ml. The water flow rate is 3 liters / min, the pouring process is sprinkled with sulfur powder to prevent burning, and the ingot is taken out after cooling;

[0029] 2) Thermal processing heating process: Before forming, place the sample in a heating furnace for heating and heat preservation. The heating temperature is set to 300℃, and the holding time is 10 minutes, so that the sample is heated evenly and without grain growth. Ensure that the core ...

Embodiment 2

[0033] The difference between Example 2 and Example 1 is that the processing object is different, and the alloy composition of the processing object is Mg-6Zn-0.45Zr.

[0034] The sample material has a good surface after thermal processing, no obvious cracks, and no obvious macroscopic loss.

[0035] In the following, the microstructure and mechanical properties obtained in Example 1-2 are analyzed in combination with experimental data.

[0036] 1. Microstructure characterization: Select the cast alloy and wrought alloy cores in Example 1-2 to prepare microstructure observation samples. After mounting, pre-grinding, polishing, and corrosion, the MM6 horizontal metallurgical microscope is used to observe the corroded samples. Casting organization such as figure 1 with figure 2 As shown, the deformed tissue is Figure 4-Figure 7 Shown.

[0037] From figure 1 with figure 2 It can be seen that in Example 1 and Example 2, under the action of the water-cooled copper mold, the alloy solid...

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Abstract

A short-flow preparation method for a high-performance Mg-Zn-Zr alloy comprises casting and hot working of the alloy. A casting mold of the alloy is a square water-cooled copper mold, the molding sizeof the mold is 150 mm*150 mm*150 mm, the cooling water capacity of the mold ranges from 290 ml to 310 ml, and the cooling water flow rate ranges from 2.5 liters / minute to 3.5 liters / minute. The hot working temperature of the alloy ranges from 295 DEG C to 305 DEG C, the holding time before hot working ranges from 9 minutes to 11 minutes, the hot working mode is three-way forging with small-pass strain and high strain rate, forging equipment is an air hammer, the heating is not repeated between passes, the pass strain ranges from 19.5% to 20.5%, the number of deformation passes is 12, and thecooling mode is air cooling. According to the short-flow preparation method, a uniform equiaxial casting structure similar to a solid solution is prepared through the water-cooled copper mold, meanwhile, the temperature drop caused by heat dissipation is compensated by using the temperature rise effect of high-speed deformation, no heating is needed between passes, the processing period is short,and the method is suitable for production of the bulk Mg-Zn-Zr alloy.

Description

Technical field [0001] The invention relates to a method for preparing a Mg-Zn-Zr alloy, in particular to a method for preparing a high-performance Mg-Zn-Zr alloy in a short process. Background technique [0002] Magnesium alloy is the lightest metal structural material, with high specific strength, high specific rigidity, good damping ability, excellent thermal and electrical conductivity, good dimensional stability, electromagnetic shielding and easy recycling characteristics. In recent years, as energy and environmental issues have become increasingly prominent, magnesium alloys have risen rapidly as new engineering materials, and have gradually become an ideal substitute for engineering materials such as aluminum alloys, steel, and engineering plastics. They are used in aerospace, transportation, weaponry and electronics. Electrical appliances and other fields have important application value and broad application prospects. [0003] However, the low strength of magnesium allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D7/06B22D21/04B21J5/00
CPCB21J5/002B22D7/06B22D7/064B22D21/007
Inventor 吴远志邓彬叶拓周小桃李庆芬刘伟
Owner HUNAN INST OF TECH
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