Efficient integrated machining method for preparing high-strength and high-toughness magnesium alloy sheet with controllable bimodal structure

A high-strength, high-toughness, integrated processing technology, used in metal processing equipment, manufacturing tools, metal rolling, etc., to improve strength, increase single-pass reduction, and reduce energy consumption and costs.

Inactive Publication Date: 2020-06-26
宿迁市河海大学研究院 +1
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  • Claims
  • Application Information

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Problems solved by technology

The study found that the elongation at room temperature of copper with bimodal distribution structure prepared by rolling + instantaneous annealing method reached 65%, which was close to that of annealed coarse-grained copper; but its strength reached 430MPa, which was slightly lower than that of fully nanocrystalline copper (480MPa).

Method used

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  • Efficient integrated machining method for preparing high-strength and high-toughness magnesium alloy sheet with controllable bimodal structure
  • Efficient integrated machining method for preparing high-strength and high-toughness magnesium alloy sheet with controllable bimodal structure
  • Efficient integrated machining method for preparing high-strength and high-toughness magnesium alloy sheet with controllable bimodal structure

Examples

Experimental program
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Effect test

Embodiment 1

[0025] refer to Figure 1-6 , This example uses AZ91 (Mg-9wt%Al-1wt%Zn) magnesium alloy as the test material.

[0026] Firstly, the as-cast AZ91 magnesium alloy is wire cut into a cuboid block of 49mm×49mm×100mm, figure 1 It is the metallographic structure of solution treated AZ91. Then it was placed in the RD-ECAP mold and heated to 300°C for 30 minutes, and then subjected to 16 passes of ECAP processing. After ECAP processing, the average grain size was about 8 microns, such as figure 2 . The prepared ultra-fine grained AZ91 magnesium alloy and the non-ECAP solid solution AZ91 magnesium alloy were rolled in a single pass with 70% reduction, and the microstructure obtained was as follows: image 3 As shown, after the ultra-fine grain AZ91 measured by EBSD is hot-rolled with a reduction of 70% in a single pass, the grain area distribution diagram is as follows Figure 4 Shown, and the above three materials were subjected to tensile tests, the results are as follows Figu...

Embodiment 2

[0028] In this embodiment, AZ91 (Mg-9wt%Al-1wt%Zn) magnesium alloy is used.

[0029] The difference between the processing technology and that of Example 1 is that the single-pass reduction in S4 is 60%. Also obtained the bimodal structure, the microstructure map and the grain area distribution map measured by EBSD, such as Image 6 shown.

[0030] In Examples 1 to 2, bimodal microstructures were obtained in AZ91 magnesium alloys processed through the combination of equal channel angular extrusion, extrusion blanking and single-pass high-reduction rolling.

[0031]Ultra-fine-grained magnesium alloys with fine structure and good performance can be prepared by ECAP processing technology, especially in terms of improving the plasticity / superplasticity of magnesium alloys, it has been confirmed by many experiments. The invention makes full use of the characteristics of good plastic deformation ability of the ultra-fine-grained magnesium alloy after ECAP, combines with the subseq...

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Abstract

The invention belongs to the technical field of magnesium alloy plastic machining, and discloses an efficient integrated machining method for preparing a high-strength and high-toughness magnesium alloy sheet with a controllable bimodal structure. The method comprises the following steps that S1, magnesium alloy pre-solution treatment is carried out to obtain a uniform structure; S2, automatic multi-pass rotary die equal-channel corner extrusion machining is carried out; S3, extrusion cogging is carried out, and specifically extrusion cogging is carried out at the temperature of 300-400 DEG C;and S4, single-pass large-rolling-reduction rolling machining is carried out. According to the method, pre-solution treatment and multi-pass ECAP machining are used for being combining with subsequent extrusion cogging and single-pass large-rolling-reduction rolling machining, and the magnesium alloy structure is refined through pre-solution and multi-pass equal-channel corner extrusion, so thatthe deformation texture is optimized, and the plastic deformation capacity of the magnesium alloy is improved; and then rapid thinning is achieved through the extrusion cogging and single-pass large-rolling-reduction rolling technology, the rolling pass is reduced, the production efficiency is improved, the controllable bimodal structure can be obtained by adjusting technological parameters, and the purposes of high strength and high toughness of the magnesium alloy are achieved.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy plastic processing, in particular to an efficient integrated processing method for preparing a high-strength and high-toughness magnesium alloy sheet with a controllable bimodal structure. Background technique [0002] With the continuous growth of the world economy, especially our country's economy, the consumption of resources and energy is increasing day by day, energy problems, environmental degradation and global warming are becoming more and more prominent, and the energy crisis is imminent. In order to achieve energy saving and environmental protection, people have increasingly high requirements for lightweight structures, and the application of magnesium and its alloys has received more and more attention, and the scope of application is also expanding. Using magnesium alloy as structural parts can reduce the weight of parts and reduce energy consumption. It is an ideal structural ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/00B21C29/00B21B3/02B21B37/74B21B37/00B21B37/56C22F1/06C22C23/02
CPCB21B3/02B21B37/00B21B37/56B21B37/74B21B2265/10B21C23/001B21C23/002B21C29/003C22C23/02C22F1/06
Inventor 李玉华马爱斌徐琼江静华杨东辉邱超刘欢
Owner 宿迁市河海大学研究院
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