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High-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy and preparation method thereof

A technology of rare earth magnesium and magnesium alloys, which is applied in the deformation processing of non-ferrous metal materials and the field of metal materials, can solve the problems of reduced strength, poor mechanical properties, and difficult to be widely used in aerospace fields, and achieve high service temperature, high specific strength and specific strength. The effect of stiffness

Inactive Publication Date: 2021-06-18
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But all in all, the tensile strength of the above rare earth magnesium alloys at room temperature is below 300MPa, which is difficult to meet the requirements for the manufacture of high-performance large-scale magnesium alloy main load-bearing components
[0005] The two series of magnesium alloys, AZ and AM, have broad application prospects in the automotive industry and have high specific strength, but their absolute strength is not high, especially when the service temperature exceeds 120 ° C, the strength of the alloy increases with the temperature Therefore, this type of alloy should not be used for a long time at a higher temperature
The Chinese patent application number 201410293056.0 discloses a high-strength magnesium alloy material and its preparation method. After solid solution aging, the as-cast alloy can reach a tensile strength of >360MPa at room temperature, a yield strength of more than 260MPa, and an elongation at break of 16 % or more, but the mechanical properties of the alloy in high temperature environment are relatively poor, and it is difficult to be widely used in the aerospace field

Method used

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  • High-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy and preparation method thereof
  • High-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy and preparation method thereof
  • High-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0042] The high-strength Mg-Gd-Y-Zn-Zr rare earth magnesium alloy is formulated according to the following mass percentages: 12.0% Gd, 4.5% Y, 2.0% Zn, 0.4% Zr, and the balance is magnesium and unavoidable impurity elements , and prepared into magnesium alloy rods. The tensile strength and elongation of the obtained magnesium alloy rods were tested, and the specific test results are shown in Table 1.

[0043] Table 1 The mechanical property data obtained in the test of the magnesium alloy bar prepared in Example 1

[0044] Tensile strength (Rm) / MPa Yield strength (R p0.2 ) / MPa

[0045] The concrete preparation method of this alloy comprises the following steps:

[0046] (1) Preparation of magnesium alloy cast rod: first design the alloy element proportioning material according to the above mass percentage, adopt semi-continuous casting to prepare a magnesium alloy cast rod of φ400×4200mm, and machine it into a rod stock of φ330mm after cooling at room temperat...

Embodiment 2

[0063] In this embodiment, the high-strength Mg-Gd-Y-Zn-Zr rare earth magnesium alloy is proportioned according to the following components by mass percentage: 11.0% Gd, 4.5% Y, 2.0% Zn, 0.6% Zr, and the balance is magnesium and Unavoidable impurity elements, the alloy is prepared by the same preparation method as in Example 1, specifically, it is prepared by semi-continuous casting according to (1.1)-(1.5) of step (1) in Example 1 to φ400×4200mm Then the magnesium alloy cast rod is heated up to 325°C, and after 4 hours of heat preservation, it is homogenized at 535°C for 9 hours; the homogenized cast rod is subjected to upsetting extrusion composite deformation: firstly, the cast rod is heated to 350°C, hold for 2 hours for primary heating, then heat the cast rod to 480°C, hold for 6 hours for secondary heating, and perform upsetting and extrusion composite deformation on the heated bar. The heating temperature of the mold is 410-450°C. The pressure ratio is 1.95:1, and the e...

Embodiment 3

[0065] In this embodiment, the high-strength Mg-Gd-Y-Zn-Zr rare earth magnesium alloy is proportioned according to the following components by mass percentage: 13.0% Gd, 4.0% Y, 2.0% Zn, 0.5% Zr, and the balance is magnesium and Unavoidable impurity elements, the alloy is prepared by the same preparation method as in Example 1, specifically, it is prepared by semi-continuous casting according to (1.1)-(1.5) of step (1) in Example 1 to φ400×4200mm Then the magnesium alloy cast rod is heated up to 325°C, and after 4 hours of heat preservation, it is homogenized at 535°C for 9 hours; the homogenized cast rod is subjected to upsetting extrusion composite deformation: firstly, the cast rod is heated to 350°C, hold for 2 hours for primary heating, then heat the cast rod to 480°C, hold for 6 hours for secondary heating, and perform upsetting and extrusion composite deformation on the heated bar. The heating temperature of the mold is 420-450°C, extrusion The pressure ratio is 1.95:1,...

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Abstract

The invention discloses a high-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy. The high-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy comprises the following chemical components in percentage by mass: 10.8%-13.6% of Gd, 4.0%-4.6% of Y, 1.8%- 2.2% of Zn, 0.4%-0.6% of Zr and the balance of magnesium and inevitable impurity elements. The invention further discloses a preparation method of the high-strength Mg-Gd-Y-Zn-Zr rare-earth magnesium alloy. The preparation method sequentially comprises the following steps: (1) preparing a magnesium alloy cast bar; (2) homogenization of the bar: heating the magnesium alloy bar and preserving heat by adopting a grading homogenization system, then heating and reheating, preserving heat and carrying out homogenization treatment; and (3) upsetting-extruding composite deformation: putting the bar into a heated upsetting-extruding composite die, and obtaining a high-toughness deformed-state heat-resistant rare-earth magnesium alloy material after multiple times of circulating upsetting-extruding; (4) solid solution and aging treatment: adopting solid solution and aging treatment for heat treatment, and preserving heat, and quenching by adopting hot water after discharging; and after cooling to room temperature, aging and preserving heat. The magnesium alloy prepared through the preparation method is high in quality, and particularly can keep high mechanical performance at a temperature of 300 DEG C.

Description

technical field [0001] The invention relates to the technical field of deformation processing of nonferrous metal materials, and belongs to the technical field of metal materials, in particular to a high-strength Mg-Gd-Y-Zn-Zr rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Aerospace and national defense military equipment such as launch vehicles, space shuttles, and strategic missiles are related to national security and comprehensive national strength. Large capacity, high mobility, low energy consumption, long life, reliability, economy, and environmental protection have become important development trends for these major equipment . The development and application of new lightweight materials is the key to achieving low energy consumption, which directly affects the performance and service life of the load-bearing structure. As the lightest lightweight material, magnesium alloy is of great significance in realizing lightweight ...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/02C22F1/06
CPCC22C1/02C22C23/06C22F1/06
Inventor 于建民张治民李兆灿孟模薛勇程眉吴泽儒
Owner ZHONGBEI UNIV
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