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Grain distribution controlled two-peak texture ZK21 magnesium alloy preparation method

A technology of ZK21 and magnesium alloy, which is applied in the direction of metal processing equipment, casting mold composition, manufacturing tools, etc., can solve the problem of low tissue repeatability and achieve consistent results

Inactive Publication Date: 2018-10-12
HUNAN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obtaining bimodal grain structure is an effective method to prepare high-strength and high-toughness materials, but it is still relatively seldom used in the preparation of high-strength and high-toughness magnesium alloys, and the bimodal grain structure obtained by existing methods is mostly randomly distributed grains, and the microstructure Not very repeatable

Method used

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  • Grain distribution controlled two-peak texture ZK21 magnesium alloy preparation method
  • Grain distribution controlled two-peak texture ZK21 magnesium alloy preparation method
  • Grain distribution controlled two-peak texture ZK21 magnesium alloy preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The ZK21 magnesium alloy selected in this embodiment has a composition of Mg-2Zn-0.45Zr, and the length, width and height of the sample before processing are 35 mm, 35 mm, and 40 mm, respectively.

[0032] A method for preparing a bimodal structure ZK21 magnesium alloy with controllable grain distribution, comprising the following steps:

[0033] 1) Casting process: Prepare ZK21 magnesium alloy melt according to the magnesium alloy smelting method, pour the melt into a square water-cooled copper mold, the size of the copper mold is 150mm*150mm*150mm, the mold cooling water capacity is 300ml, and the cooling water flow rate is 3 liters per minute, during the pouring process, sulfur powder is sprinkled to prevent burning, and the ingot is taken out after cooling; under the action of the water-cooled copper mold, the solidification structure of the alloy is uniform equiaxed crystals, and there is no coarse second phase near the grain boundary, basically A single-phase soli...

Embodiment 2

[0038] The difference between embodiment 2 and embodiment 1 lies in that the size of the samples is different, and the length, width and height of the samples before processing are 70 mm, 70 mm, and 80 mm, respectively.

[0039] After thermal processing, the surface of the sample material is good, without obvious cracks, and without obvious macroscopic loss.

Embodiment 3

[0041] The difference between embodiment 3 and embodiment 1 and embodiment 2 lies in that the size of the samples is different, and the length, width and height of the samples before processing are 140 mm, 140 mm, and 140 mm, respectively.

[0042] The surface of the sample after thermal processing is good, with no obvious cracks and no obvious macro loss.

[0043] The microstructure and mechanical properties of the bimodal magnesium alloy obtained in Examples 1-3 are analyzed below in combination with the experimental data.

[0044] 1. Microstructure characterization: Select the core of the sample in Example 1-3 to prepare a microstructure observation sample. After mounting, pre-grinding, polishing, and corrosion, the MM6 horizontal metallographic microscope is used to observe the corroded sample. The plane of observation is vertical In the forging direction before sampling, the microstructure and morphology are as follows: Figure 3-Figure 6 and Figure 8-Figure 12 shown. ...

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Abstract

The invention relates to a grain distribution controlled two-peak texture ZK21 magnesium alloy preparation method. The method comprises alloy casting and heat processing, an alloy casting die is a square water cooling copper die, the die molding size is 150 mm*150 mm*150 mm, the die cooling water capacity is 300+ / -10 ml, and the cooling water flowing speed is 3+ / -0.5 l / min; and the alloy heat treatment temperature is 250+ / -5 DEG C, the heat preservation time before heat machining is 10+ / -1 min, the heat processing manner is small path strain high-strain rate three-dimensional forging, forgingequipment is an air hammer, repeated heating is avoided between paths, the path strain capacity is (10+ / -0.5)%, the quantity of the transformation path is 24, and the cooling manner is air cooling. The water cooling copper die is used for preparing an even equal-axis approximate solid solution casting structure, and heat treatment is not needed before cast ingot heat processing; and heating is notneeded before paths, the machining period is short, and the grain distribution controlled two-peak texture ZK21 magnesium alloy preparation method is suitable for block ZK21 wrought magnesium alloy production.

Description

technical field [0001] The invention relates to a method for preparing a bimodal structure ZK21 magnesium alloy, in particular to a method for preparing a bimodal structure ZK21 magnesium alloy with controllable grain distribution. Background technique [0002] Magnesium alloy is the lightest metal structure material with high specific strength, high specific stiffness, good vibration damping ability, excellent thermal conductivity and electrical conductivity, good dimensional stability, electromagnetic shielding and easy recycling. In recent years, with the increasingly prominent energy and environmental issues, magnesium alloys have rapidly emerged as new engineering materials, and have gradually become ideal substitutes for engineering materials such as aluminum alloys, steel, and engineering plastics. Electrical appliances and other fields have important application value and broad application prospects. [0003] However, the low strength of magnesium alloys and the lag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06B22C9/06B22D27/04
CPCC22F1/06B22C9/065
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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