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High-toughness rare earth heat-resistant magnesium alloy and preparation method thereof

A magnesium alloy and rare earth technology, which is used in the deformation processing of non-ferrous metal materials and the field of metal materials, can solve the problems of weak plastic deformation resistance, poor overall toughness and ductility, etc.

Inactive Publication Date: 2021-07-06
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The elongation rate of the rare earth magnesium alloy involved in the above patents is less than 8%, the overall toughness and ductility are relatively poor, and the resistance of the components to plastic deformation is weak

Method used

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  • High-toughness rare earth heat-resistant magnesium alloy and preparation method thereof
  • High-toughness rare earth heat-resistant magnesium alloy and preparation method thereof
  • High-toughness rare earth heat-resistant magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The high-strength rare earth heat-resistant magnesium alloy is formulated according to the following mass percentages: 10.0% Gd, 3.6% Y, 2% Zn, 0.5% Zr, and the balance is magnesium and unavoidable impurity elements, and is prepared into a magnesium alloy bar. The tensile strength and elongation of the obtained magnesium alloy rods were tested, and the specific test results are shown in Table 1.

[0044] The mechanical property data obtained in the magnesium alloy rod test prepared in the embodiment one of table 1

[0045] Tensile strength (Rm) / MPa Yield strength (R p0.2 ) / MPa

Elongation (A) / % first heat 315 226 22 second heat 323 231 20 third heat 325 223 20 Fourth heat 313 219 22

[0046] The concrete preparation method of this alloy comprises the following steps:

[0047] (1) Preparation of magnesium alloy cast rod: first design the alloy element proportioning material according to the above mass percentage, a...

Embodiment 2

[0065] In this embodiment, the high-strength rare earth heat-resistant magnesium alloy is proportioned according to the following mass percentages: 8.4% Gd, 3.4% Y, 2% Zn, 0.4% Zr, and the balance is magnesium and unavoidable impurity elements, The alloy is prepared by the same preparation method as in Example 1. Specifically, a magnesium alloy cast rod of φ400×4200 mm is prepared by semi-continuous casting according to (1.1) to (1.5) of step (1) in Example 1; Then heat up the magnesium alloy cast rod to 300°C, hold it for 4 hours, and then homogenize it at 525°C for 8 hours; carry out upsetting and extrusion composite deformation of the cast rod after homogenization treatment: first heat the cast rod to 300°C, and hold it for 2 hours. First-level heating, then heating the cast rod to 480°C, holding it for 6 hours for second-level heating, and performing upsetting and extrusion compound deformation on the heated rod. The heating temperature of the mold is 430°C, and the extrusi...

Embodiment 3

[0067] In this embodiment, the high-strength rare earth heat-resistant magnesium alloy is proportioned according to the following mass percentages: 9.2% Gd, 3.1% Y, 1.8% 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, a magnesium alloy cast rod of φ400×4200 mm is prepared by semi-continuous casting according to (1.1) to (1.5) of step (1) in Example 1; Then heat up the magnesium alloy cast rod to 300°C, hold it for 4 hours, and then homogenize it at 525°C for 8 hours; carry out upsetting and extrusion composite deformation of the cast rod after homogenization treatment: first heat the cast rod to 300°C, and hold it for 2 hours. First-level heating, then heating the cast rod to 480°C, holding it for 6 hours for second-level heating, and performing upsetting and extrusion compound deformation on the heated rod. The heating temperature of the mold is 440°C, and the extru...

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Abstract

The invention discloses a high-toughness rare earth heat-resistant magnesium alloy. The high-toughness rare earth heat-resistant magnesium alloy comprises the following chemical components of, in percentage by mass, 8.0%-10.8% of Gd, 3.1%-4.0% of Y, 1.8%-2.2% of Zn, 0.4%-0.5% of Zr and the balance magnesium and inevitable impurity elements, the invention further discloses a preparation method of the high-toughness rare earth heat-resistant magnesium alloy, the preparation method sequentially comprises the following steps of (1) preparing a magnesium alloy casting rod; (2) homogenization of the bar, specifically, heating a magnesium alloy bar and preserving heat by adopting a grading homogenization system, then heating and reheating, preserving heat and carrying out homogenization treatment; (3) upsetting-extruding composite deformation, specifically, putting the bar into a heated upsetting-extruding composite die, and obtaining a high-toughness deformation state rare earth heat-resistant magnesium alloy material after multiple times of cyclic upsetting-extruding. (4) solid solution and aging treatment, specifically, enabling heat treatment to adopt solid solution and aging treatment and heat preservation, adopting hot water quenching after discharging, and after cooling to room temperature, conducting aging and preserving heat. The magnesium alloy prepared by the solution is good in quality, and has more obvious high tensile strength and high elongation compared with common magnesium alloys in the market.

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 and tough rare-earth heat-resistant 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 require key components to have the characteristics of high performance, light weight, and high efficiency. However, more than 90% of conventional rocket / missile hoods, fuel tanks and three compartments are made of aluminum, which is seriously overweight and significantly affects various combat technical indicators. At the same time, the performance strengthening mechanism of aluminum alloy determines that its strength decreases rapidly with the increase of temperature, and it cannot be used above 250 °C, which cannot meet the service enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/02C22F1/06
CPCC22C1/02C22C23/06C22F1/06
Inventor 于建民张治民李兆灿王强李国俊张紫薇
Owner ZHONGBEI UNIV
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