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Processing method for improving drawing and pressing asymmetry of magnesium alloy

A technology of tension-compression asymmetry and processing methods, which is applied in the field of magnesium alloy processing, can solve problems such as difficulty in realizing large-scale industrial production of large-scale parts, limited processing methods of magnesium alloys, and asymmetric tension-compression of magnesium alloys. Good industrial application prospects, conducive to large-scale industrial applications, and the effect of simple equipment

Inactive Publication Date: 2014-01-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many studies on the asymmetry of tension and compression of magnesium alloys, but there are very limited processing methods on how to improve the asymmetry of tension and compression of magnesium alloys. Equal channel angular extrusion processing technology is one of the more common methods.
[0004] The tension-compression asymmetry of magnesium alloys can be improved by equal-channel angular extrusion, but the strength of materials processed by equal-channel angular extrusion will basically decrease, and the process is more complicated, requiring repeated multi-pass extrusion, and the processed materials are affected by Due to the limitation of mold size and equipment, low production efficiency and high cost, it is difficult to realize the preparation of large-scale parts and large-scale industrial production

Method used

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  • Processing method for improving drawing and pressing asymmetry of magnesium alloy
  • Processing method for improving drawing and pressing asymmetry of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The cast-rolled AZ31 magnesium alloy solid round bar was homogenized and annealed at 400°C for 1h.

[0045] The mechanical property parameters before torsion after annealing are: compressive yield strength σ yc 57MPa, tensile yield strength σ yt 71MPa, tensile strength σ bt is 213MPa, σ yc / σ yt is 0.80, and its tensile mechanical curve is shown in the attached figure 2 Curve 1 in .

[0046] After the round bar is twisted 180° clockwise with its length direction as the axis at a speed of 1 revolution / min, its mechanical performance parameters are:

[0047] Compressive yield strength σ yc 101MPa, tensile yield strength σ yt 120MPa, tensile strength σ bt It is 237MPa, which is 11.3% higher than that before torsion; σ yc / σ yt Improved from 0.80 before torsion to 0.84 (see Table 1).

[0048] attached by figure 2 It can be seen that after being twisted and deformed by 180° (curve 2), its tensile strength and yield strength are higher than those before twisting...

Embodiment 2

[0050] The cast-rolled AZ31 magnesium alloy solid round bar was homogenized and annealed at 400°C for 1h.

[0051] At the speed of 1 turn / min, the round bar is repeatedly torsional and deformed with its length direction as the axis, twisted 180° clockwise and then 180° counterclockwise, and after the cumulative twist of 360°, its mechanical performance parameters are:

[0052] Compressive yield strength σ yc 141MPa, tensile yield strength σ yt 152MPa, tensile strength σ bt 274MPa, 28.6% higher than 213MPa before torsion; σ yc / σ yt Improvement from 0.80 before torsion to 0.93 (see Table 1).

[0053] attached by figure 2 It can be seen that after the cumulative torsional deformation of 360° (curve 3), its tensile strength and yield strength are significantly improved compared with those before torsion (curve 1).

[0054] attached by image 3 (curve 4 is a compression curve, and curve 5 is a tension curve) it can be seen that the compression yield strength σ of the magne...

Embodiment 3

[0056] The AZ31 magnesium alloy hollow tube was homogenized and annealed at 450°C for 2h.

[0057] The mechanical property parameters before torsion after annealing are: compressive yield strength σ yc 73MPa, tensile yield strength σ yt 150MPa, tensile strength σ bt is 290MPa, σ yc / σ yt is 0.50.

[0058] Fill the circular tube with sand before torsion deformation. After filling, the circular tube is twisted 150° clockwise and then 150° counterclockwise at a speed of 2 turns / min. Intensity σ yc 108MPa, tensile yield strength σ yt 120MPa, tensile strength σ bt is 315MPa, which is 8.6% higher than that before torsion, σ yc / σ yt From 0.50 before torsion to 0.90 (see Table 1).

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Abstract

The invention relates to a processing method for improving the drawing and pressing asymmetry of magnesium alloy. The method comprises the steps of homogenizing a magnesium alloy rod or pipe; and then, with the axis of the rod or pipe as a rotating center, carrying out clockwise and / or anticlockwise torsional deformation. Crystals are rotated and twinborn because the magnesium alloy rod or pipe is under the action of a pure shear stress through repeated torsional deformation, the volume fractions of produced twin crystals are also in gradient distribution from edges to a central part due to different deformation degrees of a sample from the central parts to the edges on a cross section, and the crystal orientation distribution of the sample can be greatly changed due to the twin crystals, so that the texture of a basal plane can be effectively regulated, and the drawing and pressing asymmetry of magnesium alloy is mainly weakened on the aspect of the texture of the basal plane. The method is reasonable in technological design, simple in equipment requirements, convenient to operate, low in cost, low in energy consumption and high in efficiency, the strength of magnesium alloy is increased, and the drawing and pressing asymmetry problem of magnesium alloy is also greatly improved, and the method has a good industrial application prospect.

Description

technical field [0001] The invention discloses a processing method for improving the tension-compression asymmetry of magnesium alloys, in particular to a method for improving the tension-compression asymmetry of magnesium alloys through repeated twisting and deformation. 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 the advantages of high specific strength and specific stiffness, large elastic modulus, good heat dissipation, good damping and shock absorption, large impact load capacity and easy recycling. The production fields of aerospace, automobile, electromechanical and electronic products have broad application prospects, and are ideal lightweight alternative materials for steel and aluminum alloy materials. Magnesium alloy has a close-packed hexagonal crystal structure, and there are few independent s...

Claims

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Application Information

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IPC IPC(8): C22F1/06
Inventor 杨续跃蒋莉萍张笃秀王军
Owner CENT SOUTH UNIV
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