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Method for extrusion two-step equal channel angle of magnesium alloy

A technology of equal channel angular extrusion and equal channel extrusion, applied in the field of material processing, can solve problems such as the reduction of alloy strength, and achieve the effect of improving the strength and toughness at room temperature

Inactive Publication Date: 2007-08-15
FENGYANG L S NET FORMING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that although the grains of the alloy are obviously refined, the elongation of the alloy is obviously increased, but the strength of the alloy is obviously reduced.

Method used

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  • Method for extrusion two-step equal channel angle of magnesium alloy
  • Method for extrusion two-step equal channel angle of magnesium alloy
  • Method for extrusion two-step equal channel angle of magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1. Design and manufacture the mold according to Figure 1, select the channel angle φ of the mold to be 90°, the angle radian ψ to be 0°, and the strain amount of each pass deformation to be 1.15.

[0021] 2. The given magnesium alloy material is a conventional extruded AZ31 magnesium alloy with an average grain size of 16 μm. The mechanical properties of the alloy are: elongation 21%, yield strength 152 MPa, and tensile strength 256 MPa. The alloy was subjected to ECAE deformation, the sample size was: 10×10×90cm, the ECAE deformation was carried out, the deformation rate was set at: 0.28mm / s, and the deformation temperature range of the first deformation pass was adjusted to 200-300°C, the result It shows that the lowest deformation temperature without cracks is 225℃.

[0022] 3. The alloy is subjected to multi-pass deformation at 225°C, and the deformation route adopts B, that is, the sample is rotated 90° clockwise along the extrusion axis between each pass.

[0023...

Embodiment 2

[0025] 1. Design and manufacture the mold according to Figure 1, select the channel angle φ of the mold to be 120°, and the angle radian ψ to be 45°.

[0026] 2. The given magnesium alloy material is a conventional extruded AZ61 magnesium alloy with an average grain size of 20 μm. The initial mechanical properties of the alloy are: elongation 19%, yield strength 202MPa, and tensile strength 302MPa. The alloy was subjected to ECAE deformation, the sample size was: 10×10×90cm, the ECAE deformation was carried out, the deformation rate was set at: 0.28mm / s, and the deformation temperature range of the first deformation pass was adjusted to 200-300°C, the result It shows that the lowest deformation temperature without cracks is 250℃.

[0027] 3. The alloy is subjected to multi-pass deformation at 250°C. The deformation route adopts D, that is, the sample is rotated 90° clockwise along the extrusion axis between the previous passes, and the sample is rotated 90° counterclockwise al...

Embodiment 3

[0030] 1. Design and manufacture the mold according to Figure 1, select the channel angle φ of the mold to be 110°, and the angle radian ψ to be 30°.

[0031] 2. The given magnesium alloy material is conventional extruded Mg97Zn2Y1 magnesium alloy, the initial mechanical properties are: elongation 2.3%, yield strength 352MPa, tensile strength 413MPa. The alloy was subjected to ECAE deformation. The sample size was: 10×10×90cm. ECAE deformation was carried out. The deformation temperature range of the first pass of deformation was adjusted to 300-400°C. The results showed that the minimum deformation temperature that can achieve no cracks is 350 ℃.

[0032] 3. The alloy is subjected to multi-pass deformation at 350°C, and the deformation route is C, that is, the sample is rotated 180° along the extrusion axis between each pass.

[0033] 4. After 4 passes of deformation, the mechanical properties of the alloy are: elongation 8%, yield strength 376MPa, tensile strength 413MPa. ...

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Abstract

A two-step squeeze method with equal channel angle for Mg-alloy includes such steps as designing equi-channel squeezing die set, regulating deformation speed and temp to find out the lowest temp for non-crack deformation, equichannel squeezing by 2-4 passes, lowering the deformation temp, and squeezing by 4-8 passes. Its advantage is high strength and toughness.

Description

technical field [0001] The invention relates to a method in the technical field of material processing, in particular to a two-step equal channel angular extrusion method for magnesium alloys. Background technique [0002] Magnesium alloys are attractive and lightest metal structural materials, and their applications in automobile, locomotive and aviation industries have broad prospects. Structural parts in these industries often fail under normal stress and / or shear stress, requiring materials not only to have high specific strength, but also to have sufficient plasticity, that is, to have high strength and toughness. Since magnesium and magnesium alloys have no phase transition from below the solidification temperature to room temperature, the solid solubility of alloy elements is low, and there is no effective strengthening phase, so phase transformation strengthening, solid solution strengthening and second phase strengthening are usually used in alloy design. None of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C23/00B21C31/00
Inventor 林栋樑靳丽陈彬曾小勤丁文江毛大立
Owner FENGYANG L S NET FORMING CO LTD
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