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An ultra-high-strength and high-temperature-resistant magnesium alloy

A high-temperature-resistant, ultra-high-strength technology, applied in the field of magnesium alloys, can solve problems such as poor processing plasticity, severe surface cold insulation, and low qualified rate of finished products

Active Publication Date: 2018-08-10
湖南镁宇科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the current application of magnesium alloys is far behind that of aluminum alloys. The reasons include: the high-strength and heat-resistant magnesium alloy billet with high rare earth content is prone to severe cracking during the semi-continuous casting process, and the surface is severely cold-shocked, resulting in the production of castings. The size of the ingot and the final component are limited; the high-temperature strength is low, which makes it difficult to meet the high-temperature service requirements; the processing plasticity is poor, and the qualified rate of finished products is low, etc.
Mg-Gd-Y-Zr series alloys developed in recent years have higher room temperature and high temperature strength than Mg-Zn-Zr series and Mg-Al-Zn series, but their casting performance and plastic processing performance are poor, and it is difficult to meet the requirements of the aerospace industry. Urgent demand for lightweight and high-strength materials in the preparation of large-scale components

Method used

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  • An ultra-high-strength and high-temperature-resistant magnesium alloy
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  • An ultra-high-strength and high-temperature-resistant magnesium alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The chemical composition of magnesium alloy is: Gd: 9.0%, Y: 2.5%, Zr: 0.4%, Ag: 0.07%, Er: 0.04%, impurities include Fe, Si, Cu, Ni, Fe: 0.0015%, Si: 0.0025 %, Cu: 0.0006%, Ni: 0.002%, the total impurity content is 0.03%, and the rest is Mg. The magnesium alloy ingot was prepared by semi-continuous casting method. The ingot size was 450mm in diameter and 2700mm in length. The finished product was made after homogenization annealing and plastic deformation. The final pass rate of the shell product was 81%, and the finished product diameter was 1700mm. After treatment, tensile tests at room temperature and 200°C were carried out to obtain the tensile strength, yield strength and elongation after fracture. The specific data are shown in Table 1.

Embodiment 2

[0031] The chemical composition of magnesium alloy is: Gd: 9.5%, Y: 2.2%, Zr: 0.5%, Ag: 0.1%, Er: 0.05%, impurities include Fe, Si, Cu, Ni, Fe: 0.0026%, Si: 0.0022 %, Cu: 0.002%, Ni: 0.001%, the total impurity content is 0.014%, and the rest is Mg. The magnesium alloy ingot was prepared by semi-continuous casting method. The ingot size was 450mm in diameter and 1650mm in length. The finished product was made after homogenization annealing and plastic deformation. The final pass rate of the shell product was 71%, and the finished product diameter was 1700mm. After treatment, tensile tests at room temperature and 200°C were carried out to obtain the tensile strength, yield strength and elongation after fracture. The specific data are shown in Table 1.

Embodiment 3

[0033] The chemical composition of magnesium alloy is: Gd: 8.5%, Y: 2.3%, Zr: 0.4%, Ag: 0.5%, Er: 0.2%, impurities include Fe, Si, Cu, Ni, Fe: 0.0018%, Si: 0.002 %, Cu: 0.001%, Ni: 0.002%, the total impurity content is 0.025%, and the rest is Mg. Magnesium alloy ingots were prepared by semi-continuous casting. The ingot size was 450mm in diameter and 1700mm in length. After uniform annealing and plastic deformation, the finished product was produced. The final pass rate of the shell product was 70%, and the finished product diameter was 1700mm. After treatment, tensile tests at room temperature and 200°C were carried out to obtain the tensile strength, yield strength and elongation after fracture. The specific data are shown in Table 1.

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Abstract

The invention relates to ultrahigh-strength high-temperature-resistant magnesium alloy. The ultrahigh-strength high-temperature-resistant magnesium alloy comprises, by mass, 8.0%-9.6% of Gd, 1.8%-3.2% of Y, 0.3%-0.7% of Zr, 0.02%-0.5% of Ag, 0.02%-0.3% of Er, no more than 0.02% of Fe, no more than 0.02% of Si, no more than 0.005% of Cu, no more than 0.003% of Ni, no more than 0.1% of impurities, and the balance Mg, wherein the ratio of Gd to Y meets the relation expression of 3<=Gd / Y<=5, and the ratio of Ag to Er meets the relation expression of 1<=Ag / Er<=3. By adding Ag and Er, a large cast ingot with the diameter of 300-630 mm can be prepared, and a component with the outer diameter of 1700 mm can be prepared. In the T6 state, the tensile strength of the alloy is equal to or higher than 470 MPa, and the yield strength of the alloy is equal to or higher than 400 MPa; and at the temperature of 200 DEG C, the tensile strength of the alloy is equal to or higher than 350 MPa, and the yield strength of the alloy is equal to or higher than 260 MPa.

Description

technical field [0001] The invention relates to the field of magnesium alloys, in particular to a rare earth-containing ultrahigh-strength and high-temperature-resistant magnesium alloy. Background technique [0002] Magnesium alloy is currently the lightest metal structure material available, with high specific strength, high specific stiffness, and excellent damping performance, etc., and has broad application prospects in the fields of aviation, aerospace and automobile industries. However, the current application of magnesium alloys is far behind that of aluminum alloys. The reasons include: the high-strength and heat-resistant magnesium alloy billet with high rare earth content is prone to severe cracking during the semi-continuous casting process, and the surface is severely cold-shocked, resulting in the production of castings. The specifications of the ingot and the size of the final component are limited; the high-temperature strength is low, which makes it difficul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06
CPCC22C23/06
Inventor 刘楚明万迎春高永浩蒋树农
Owner 湖南镁宇科技有限公司