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Mg-Y-Nd-Gd-Zr-Li alloy capable of being subjected to quick aging strengthening and preparation method thereof

An aging strengthening and alloying technology, which is applied in the field of metal materials, can solve the problems of slow diffusion of rare earth elements, high energy and labor consumption, and long aging time, and achieve rapid aging strengthening, simple preparation methods, and shortened aging treatment time. Effect

Active Publication Date: 2020-05-08
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a problem that plagues magnesium-rare earth alloys such as WE43 in current applications is that due to the slow diffusion rate of rare earth elements, the required aging time is long, and energy consumption and labor consumption are high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A Mg-Y-Nd-Gd-Zr-Li alloy capable of rapid aging strengthening, its components and weight fractions are: Y: 3.7wt%, Nd: 2.5wt%, Gd: 1.9wt%, Zr: 0.5wt% %, Li: 0.5wt%, the balance is Mg, and unavoidable impurities. Its preparation method is: (1) in SF 6 and CO 2 Keep the mixed gas, weigh pure Mg, Mg-Y master alloy, Mg-Nd master alloy, Mg-Gd master alloy, Mg-Zr master alloy and vacuum-packed Li rods in proportion, and put the raw materials except Li rods at 180°C Dry for 3 hours; (2) Put the dried pure Mg into a crucible resistance furnace to melt to form magnesium liquid; (3) Mg-Y master alloy, Mg-Nd master alloy, Mg-Gd master alloy and Mg- Add the Zr master alloy into the magnesium liquid and heat it to 700°C; (4) cool down to 670°C after the master alloy is completely melted, then add the weighed Li rod and stir to obtain the melt; (5) heat the melt to 730°C and keep it for 10 minutes, then skim off the surface scum and cast the magnesium alloy ingot; (6) carry out th...

Embodiment 2

[0035] A Mg-Y-Nd-Gd-Zr-Li alloy capable of rapid aging strengthening, its components and weight fractions are: Y: 4.0wt%, Nd: 2.3wt%, Gd: 0.4wt%, Zr: 0.6wt% %, Li: 1.0wt%, the balance is Mg, and unavoidable impurities. Its preparation method is: (1) in SF 6 and CO 2 Keep the mixed gas, weigh pure Mg, Mg-Y master alloy, Mg-Nd master alloy, Mg-Gd master alloy, Mg-Zr master alloy and vacuum-packed Li rods in proportion, and put the raw materials except Li rods at 210°C Dry for 2 hours; (2) Put the dried pure Mg into a crucible resistance furnace to melt to form magnesium liquid; (3) Mg-Y master alloy, Mg-Nd master alloy, Mg-Gd master alloy and Mg- Add the Zr master alloy into the magnesium liquid and heat it to 740°C; (4) cool down to 675°C after the master alloy is completely melted, then add the weighed Li rod and stir to obtain the melt; (5) heat the melt to 750°C and keep it for 5 minutes, then skim off the surface scum and cast the magnesium alloy ingot; (6) carry out the...

Embodiment 3

[0038] A Mg-Y-Nd-Gd-Zr-Li alloy capable of rapid aging strengthening, its components and weight fractions are: Y: 4.3wt%, Nd: 2.0wt%, Gd: 1.1wt%, Zr: 0.4wt% %, Li: 1.5wt%, the balance is Mg, and unavoidable impurities. Its preparation method is: (1) in SF 6 and CO 2 Keep the mixed gas, weigh pure Mg, Mg-Y master alloy, Mg-Nd master alloy, Mg-Gd master alloy, Mg-Zr master alloy and vacuum-packed Li rods in proportion, and put the raw materials except Li rods at 250℃ Dry for 1 hour; (2) Put the dried pure Mg into a crucible resistance furnace to melt to form magnesium liquid; (3) Mg-Y master alloy, Mg-Nd master alloy, Mg-Gd master alloy and Mg- Add the Zr master alloy into the magnesium liquid and heat it to 720°C; (4) cool down to 680°C after the master alloy is completely melted, then add the weighed Li rod and stir to obtain the melt; (5) heat the melt to 740°C and keep it for 15 minutes, then skim off the surface scum and cast the magnesium alloy ingot; (6) carry out solu...

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Abstract

The invention discloses Mg-Y-Nd-Gd-Zr-Li alloy capable of being subjected to quick aging strengthening and a preparation method thereof. The alloy comprises the components of, by weight percent, 3.7-4.3 wt% of Y, 2.0-2.5 wt% of Nd, 0.4-1.9 wt% of Gd, 0.4-0.6 wt% of Zr, 0.5-1.5 wt% of Li and the balance Mg and impurities. The method comprises the steps that (1) Mg, Mg-Y Mg-Nd, Mg-Gd, Mg-Zr and Li are proportionally taken, and the raw materials except Li are dried; (2) Mg is melted into liquid; (3) molten Mg is added into the raw materials except Li to be heated; (4) after melting, cooling is conducted, and Li is added and stirred to obtain melt; (5) the melt is heated, Mg alloy is subjected to casting; (6) the Mg alloy is subjected to solid solution and water quenching; and (7) aging treatment is conducted after solid solution, and the Mg-Y-Nd-Gd-Zr-Li alloy is obtained. By adding the Li, precipitation of a strengthening phase in the aging process is promoted, the aging treatment time is shortened, and quick aging strengthening is achieved.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a Mg-Y-Nd-Gd-Zr-Li alloy capable of rapid aging strengthening and a preparation method thereof. Background technique [0002] Magnesium (Mg) alloy has the advantages of low density, wide range of sources, high specific strength and specific stiffness, and is known as "the green engineering material of the 21st century". It has high requirements for lightweight in aerospace, automobile, rail transit, and electronics industries The field has broad application prospects. At present, a major problem limiting the application of magnesium alloys is that the strength is low, which is difficult to meet the requirements of engineering applications. Therefore, it is of great value to develop new high-strength magnesium alloys. [0003] Magnesium-rare earth alloys are an important development direction of high-strength magnesium alloys. Among magnesium-rare earth alloys, WE43 all...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C1/03C22C23/06C22F1/002C22F1/06
Inventor 张扬李飞龙孙顺平李中春李小平卢雅琳
Owner JIANGSU UNIV OF TECH