Rare earth magnesium alloy with high strength and toughness and treatment method thereof

A rare earth magnesium and alloy technology, applied in the field of metal heat treatment and magnesium alloy heat treatment, can solve the problems of inability to improve the strength of the alloy, the performance is not optimal, the process is complicated, etc., to achieve large industrial practical value, improve segregation phenomenon, and improve solubility. Effect

Active Publication Date: 2021-09-28
ZHONGBEI UNIV
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Problems solved by technology

[0005] In view of the inapplicability of the existing metal heat treatment process to the deformed rare earth magnesium alloy, the main performance is that the performance is not optimal, the ductility of the alloy cannot be improved while improving the strength of the alloy, and the problems of high energ

Method used

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  • Rare earth magnesium alloy with high strength and toughness and treatment method thereof
  • Rare earth magnesium alloy with high strength and toughness and treatment method thereof
  • Rare earth magnesium alloy with high strength and toughness and treatment method thereof

Examples

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Embodiment 1

[0092] The material used in this embodiment is a cast Mg-9Gd-4Y-2Zn-0.5Zr (wt.%) rare earth magnesium alloy bar stock with a diameter of 440 mm and a height of 660 mm.

[0093] The present invention adopts a heat treatment method of multi-step aging and annealing, including the following specific steps:

[0094] Step 1, blanking: add a billet with a diameter of 60mm and a height of 50mm from an as-cast bar with a diameter of 440mm and a height of 660mm;

[0095] Step 2. Homogenization treatment: Homogenize the as-cast bar at a temperature of 520°C for 24 hours, then take out the billet and cool it with water at 25°C;

[0096] Step 3. Extrusion deformation: preheat the homogenized billet at 450°C for 30 minutes and put it into an extrusion die that has been preheated at 459°C for 8 hours for extrusion deformation. The extrusion deformation temperature is 450°C. The ratio is 16:1, and the extrusion rate is 0.8mm / s;

[0097] Step 4, the first aging treatment: Put the extruded b...

Embodiment 2

[0103] The steps are the same as in Example 1, except that the annealing time is 10 h, the yield strength is 400 MPa, the tensile strength is 478 MPa, and the elongation is 10.5%.

Embodiment 3

[0105] The steps are the same as in Example 1, except that the annealing temperature is 400°C. Its yield strength is 412MPa, tensile strength is 485MPa, and elongation is 9%.

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Abstract

The invention relates to a rare earth magnesium alloy with high strength and toughness and a treatment method thereof. The rare earth magnesium alloy is Mg-(7-12) Gd-(3-6) Y-(1-3) Zn-(0.2-1) Zr (wt.%), the rare earth magnesium alloy comprises uniform and fine grains with the average grain size not larger than 35 microns, and dense short-rod-shaped LPSO phases and cylindrical beta' nanometer strengthening phases which are precipitated from the uniform and fine grains; and the treatment method comprises the steps of deformation rare earth magnesium alloy with a double-peak microstructure, primary aging, annealing and secondary aging. According to the method, through the method that alternate aging and annealing treatment are carried out on the rare earth magnesium alloy, a fine grain structure with the short-rod-shaped long-range ordered phases and beta' strengthening phases which are uniformly and densely distributed is obtained, crack initiation can be inhibited, the mechanical performance of the alloy can be improved, and finally the rare earth magnesium alloy with high strength and toughness is prepared.

Description

technical field [0001] The invention belongs to the field of metal heat treatment, especially the field of magnesium alloy heat treatment, and specifically relates to a high-strength rare earth magnesium alloy and a treatment method thereof. Background technique [0002] Magnesium alloy has the characteristics of light weight and high specific strength, and is widely used in aerospace, automobile production, medical equipment, electronic equipment and other fields. At the same time, the poor plasticity and difficult forming characteristics of magnesium alloy hinder its wide application. Compared with other types of magnesium alloys, the addition of rare earth elements significantly improves the heat and corrosion resistance. Among them, the rare earth element yttrium is conducive to the formation of the second phase, so as to achieve the purpose of weakening the texture and improving the mechanical properties. Among the second phases formed, massive phase and lamellar phas...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22F1/06B21C23/08
CPCC22C23/06C22F1/06B21C23/08
Inventor 薛勇张治民王强郑杰于建民闫钊鸣任贤魏徐健张慧芳
Owner ZHONGBEI UNIV
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