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Ultrafine grain high-magnesium aluminum alloy hot extrusion bar and preparation method thereof

A high-magnesium aluminum alloy, hot extrusion technology, applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problem of reducing alloy plasticity, etc., to achieve small grain size, high elongation, and excellent comprehensive mechanical properties Effect

Pending Publication Date: 2022-04-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional casting method will make the brittle second phase Al in high-magnesium aluminum alloy 3 Mg 2 A large amount of precipitation occurs during solidification, which seriously reduces the plasticity of the alloy.

Method used

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  • Ultrafine grain high-magnesium aluminum alloy hot extrusion bar and preparation method thereof
  • Ultrafine grain high-magnesium aluminum alloy hot extrusion bar and preparation method thereof
  • Ultrafine grain high-magnesium aluminum alloy hot extrusion bar and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] like figure 1 Shown, a kind of preparation method of ultra-fine grain high magnesium aluminum alloy hot extrusion bar, the steps are as follows:

[0035] (1) Utilize the vacuum belt throwing machine, at a pressure of 10 -2 Under the vacuum condition of Pa, the Al-12wt%Mg alloy ingot is dissolved by means of electromagnetic induction coil heating. 12wt% Mg aluminum alloy is sprayed onto the surface of the copper wheel to obtain Al-12wt% Mg alloy thin strip;

[0036] (2) mechanically crushing the Al-12wt%Mg alloy strip so that the length of each strip is no more than 5mm;

[0037] (3) Then put the crushed strip into the sheath, which has a diameter of 30mm, a thickness of 1mm, and a height of 60mm. One side is welded tightly, and the other side is prepared with a matching cover to facilitate the compression of the strip. The sheath filled with alloy fines is cold-pressed and compacted at room temperature with a hydraulic press, the compaction stress is 200 MPa, the pre...

Embodiment 2

[0043] A method for preparing an ultra-fine-grained high-magnesium aluminum alloy hot-extruded rod, the steps are as follows:

[0044] (1) Utilize the vacuum belt throwing machine, at a pressure of 10 -2 Under the vacuum condition of Pa, the Al-9wt%Mg alloy ingot is dissolved by means of electromagnetic induction coil heating. Spray onto the surface of the copper wheel to obtain Al-9wt%Mg alloy thin strips;

[0045] (2) mechanically crushing the Al-9wt%Mg alloy strip so that the length of each strip is no more than 5mm;

[0046] (3) Then put the crushed strip into the sheath, which has a diameter of 30mm, a thickness of 1mm, and a height of 60mm. One side is welded tightly, and the other side is prepared with a matching cover to facilitate the compression of the strip. The sheath filled with alloy fines is cold-pressed and compacted at room temperature with a hydraulic press, the compaction stress is 200 MPa, the pressure of the hydraulic press is 10t, and the holding time i...

Embodiment 3

[0050] A method for preparing an ultra-fine-grained high-magnesium aluminum alloy hot-extruded rod, the steps are as follows:

[0051] (1) Utilize the vacuum belt throwing machine, at a pressure of 10 -2 Under the vacuum condition of Pa, the Al-6wt%Mg alloy ingot is dissolved by means of electromagnetic induction coil heating. Spray onto the surface of the copper wheel to obtain Al-6wt%Mg alloy thin strips;

[0052] (2) Al-6wt%Mg alloy strips are mechanically crushed so that the length of each strip is no more than 5mm;

[0053] (3) Then put the crushed strip into the sheath, which has a diameter of 30mm, a thickness of 1mm, and a height of 60mm. One side is welded tightly, and the other side is prepared with a matching cover to facilitate the compression of the strip. The sheath filled with alloy fines is cold-pressed and compacted at room temperature with a hydraulic press, the compaction stress is 200 MPa, the pressure of the hydraulic press is 10t, and the holding time i...

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Abstract

The invention discloses an ultra-fine grain high-magnesium aluminum alloy hot extrusion bar and a preparation method thereof. A high-magnesium aluminum alloy bar is prepared by using a single-roller rotating rapid solidification and hot extrusion method, and the method comprises the following specific steps: (1) preparing a high-magnesium aluminum alloy ingot into a fine-grain high-magnesium aluminum alloy strip by using a single-roller rotating melt-spinning method; (2) the high-magnesium aluminum alloy strips are cut into pieces through a machine, and the length of each strip is not larger than 5 mm; (3) filling a sheath with the sheared high-magnesium aluminum alloy strip, and compacting the high-magnesium aluminum alloy strip at room temperature by using an oil press to obtain a green body; and (4) the compacted green body is subjected to hot extrusion, and the ultra-fine grain high-magnesium aluminum alloy hot extrusion bar is obtained. By means of the method, the high-magnesium aluminum alloy bar which is high in solid solution degree, small in grain size and low in component segregation can be obtained, and the high-magnesium aluminum alloy bar has high tensile strength and ductility and is excellent in comprehensive performance.

Description

technical field [0001] The invention relates to the field of preparation of aluminum alloy rods, in particular to a method for preparing ultra-fine-grained high-magnesium aluminum alloy hot-extruded rods using single-roller rotation rapid solidification technology and hot extrusion technology. Background technique [0002] Aluminum-magnesium alloy is a common commercial aluminum alloy, which has the advantages of high strength, low density and corrosion resistance, so it is widely used in ship, vehicle and aerospace components. Common grades of aluminum-magnesium alloys are 5005, 5052, 5083, etc., and their magnesium content is 1wt.% to 5wt.%. Since magnesium has a large solid solubility in aluminum alloys, increasing the magnesium content in aluminum-magnesium alloys is conducive to further reducing the alloy density and improving the degree of solid solution strengthening. However, the traditional casting method will make the brittle second phase Al in high-magnesium alum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/06B22F5/00B22F3/02B22F3/20C22C21/06
Inventor 李烈军邓炽裕彭政务陈松军
Owner SOUTH CHINA UNIV OF TECH