A kind of high strength and toughness rare earth magnesium alloy and its processing method

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 alloy strength, performance not optimal, complicated process, etc., achieve large industrial practical value, improve segregation phenomenon, and increase solubility Effect

Active Publication Date: 2022-02-11
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 energy consumption and complicated process, etc., The invention provides a treatment process and optimized microstructure for the deformed rare earth magnesium alloy, stabilizes the structure and size, and obtains a better coordination between mechanical properties, so as to meet the needs in actual production

Method used

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  • A kind of high strength and toughness rare earth magnesium alloy and its processing method
  • A kind of high strength and toughness rare earth magnesium alloy and its processing method
  • A kind of high strength and toughness rare earth magnesium alloy and its processing method

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 high-strength and tough rare earth magnesium alloy and a processing method thereof, wherein the rare earth magnesium alloy is Mg-(7-12)Gd-(3-6)Y-(1-3)Zn-(0.2-1)Zr (wt.%), which contains uniform fine grains with an average grain size not greater than 35 μm and dense short rod-shaped LPSO phases and columnar β' nano-reinforced phases precipitated from the uniform fine grains; the treatment method includes Deformed rare earth magnesium alloy with bimodal microstructure, first aging, annealing and second aging. The invention obtains a fine-grained structure with evenly distributed and densely distributed short rod-shaped long-range ordered phases and β'-strengthened phases by means of alternate aging and annealing treatments for rare-earth magnesium alloys, which can suppress the initiation of cracks and improve the mechanical properties of the alloy. performance, and finally prepared a rare earth magnesium alloy with high strength and toughness.

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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Patent Type & Authority Patents(China)
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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