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High-yield processing method of ultra-fine crystal magnesium alloy thin plate

A processing method and magnesium alloy technology, applied in metal rolling and other directions, can solve the problems of uneven microstructure and small processing strain of ultra-fine-grained magnesium alloys, achieve reduced edge cracks, good strength and plasticity, and reduce energy consumption and cost effects

Inactive Publication Date: 2015-01-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, researchers at home and abroad have carried out a lot of research work on the equal channel angular extrusion of magnesium alloys, but the processing strain is small, and the microstructure of the prepared ultrafine-grained magnesium alloys is not uniform.
So far, there is no relevant research report on the subsequent rolling of magnesium alloys after processing by high-pass equal channel angular extrusion.

Method used

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  • High-yield processing method of ultra-fine crystal magnesium alloy thin plate
  • High-yield processing method of ultra-fine crystal magnesium alloy thin plate
  • High-yield processing method of ultra-fine crystal magnesium alloy thin plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] This example uses ZK60 (Mg-6wt% Zn-0.5wt% Zr) magnesium alloy as the test material.

[0027] First, the as-cast ZK60 magnesium alloy was wire-cut into a cuboid block of 20mm×20mm×40mm, and then placed in a heating furnace and heated to 420°C for 16h for solution treatment. figure 1 It is the metallographic structure of as-cast ZK60, showing coarse dendrites; after solid solution treatment, the dendrite grain boundaries disappear, and the grains grow, with an average grain size of about 150 microns, such as figure 2 . Optionally, homogenization heat treatment can also be performed at 420° C. for 12 hours. The solution-treated block was placed in a mold preheated to 300°C for 30 minutes, and multi-pass equal channel angular extrusion was performed on it. After 12 passes of extrusion, the crystal grains are obviously refined, the average particle size is less than 5 microns, and the structure is uniform, such as image 3 shown.

[0028] Cut the sample after equal cha...

Embodiment 2

[0030] In this embodiment, ZE41 (Mg-4%Zn-1.5%Y-Zr) magnesium alloy is used.

[0031]The difference between the processing technology and Example 1 is: the holding temperature in the first step is 450°C, and the holding time is 80min. 350°C, rolling reduction of 40% in each pass, and finally a thin plate with a thickness of 0.2 mm. After the magnesium alloy is processed, the tensile strength of the obtained magnesium alloy sheet can reach more than 300MPa, and the finished product rate can reach more than 85%.

Embodiment 3

[0033] In this embodiment, ZE41 (Mg-4%Zn-1.5%Y-Zr) magnesium alloy is used.

[0034] The difference between the processing technology and Example 1 is that the holding temperature in the first step is 400°C, and the holding time is 120 min. The temperature is 100°C, and the rolling reduction in each pass is 20%, and finally a thin plate with a thickness of 0.2 mm is obtained. After the magnesium alloy is processed, the tensile strength of the obtained magnesium alloy sheet can reach more than 320MPa, and the finished product rate can reach more than 80%.

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Abstract

The invention relates to a high-yield integrated processing technology of an ultra-fine crystal magnesium alloy thin plate, and belongs to the technical field of plastic working of magnesium alloys. A high-yield processing method comprises the following steps of: firstly, carrying out equal channel angular pressing for a plurality of times; putting a magnesium alloy billet into a preheated die to carry out heat preservation, and then carrying out equal channel angular pressing on the billet for more than eight times, so as to obtain an ultra-fine crystal magnesium alloy block; and secondly, subsequently milling and processing, rolling the ultra-fine crystal magnesium alloy block obtained in the first step for a plurality of times, so as to prepare a magnesium alloy thin plate, wherein the rolling temperature range is 100-350 DEG C. The magnesium alloy micro-structure is refined by equal channel angular pressing to improve the plastic deformation ability, and then processed into the magnesium alloy thin plate and a wide plate by a continuous rolling technology. Therefore, the produced magnesium alloy thin plate is an ultrafine-grained microstructure, even in structure, good in strength and plasticity, and high in yield.

Description

technical field [0001] The invention relates to a high-yield integrated processing technology for ultrafine-grained magnesium alloy thin plates. The invention belongs to the technical field of magnesium alloy plastic processing. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in industrial applications. It has high specific strength and specific stiffness. It has extremely important application value and broad application prospects in the fields of automobiles, electronics, and aerospace. Since magnesium has a close-packed hexagonal structure, there is only a basal slip system at room temperature, and the plastic deformation ability is poor, forming is difficult, and the yield is low. At present, the application of magnesium alloys is mainly in die casting, die casting and semi-solid forming products, and deformed magnesium alloys are only used in high-end frontier fields such as aerospace, electronics and military. Compare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21B1/22
Inventor 江静华袁玉春马爱斌宋丹杨东辉陈建清
Owner HOHAI UNIV
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