Rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation and preparation method

Patent metadata

Field	Value
Publication number	US-12509750-B2
Application number	US-202519230001-A
Country	US
Kind code	B2
Filing date	Jun 5, 2025
Priority date	Oct 24, 2024
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

Abstract

Provided is a rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation and a preparation method thereof, which belongs to the technical field of alloy materials. In the present disclosure, a microstructure of a rare earth magnesium alloy is regulated based on high-temperature and high-pressure hydrogenation to significantly improve the plasticity of the rare earth magnesium alloy. A similar microstructure can also be achieved in other high-gadolinium (Gd) and high-yttrium (Y) systems. The present disclosure provides a unique approach to enhance the plasticity of a magnesium alloy, and makes it more likely to regulate the mechanical properties of such a rare earth alloy subsequently through other deformation processes. The rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation can be used for neutron-shielding, and is a material with a structure-function integrated design that can be used in the nuclear energy field and space field.

First claim

What is claimed is:

1 . A preparation method of a rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation, comprising the following steps:
(1) according to an elemental composition of the rare earth magnesium alloy, weighing and preheating pure magnesium, pure aluminum, and at least one of a Mg-30Gd master alloy and a Mg-30Y master alloy; (2) under protection of mixed gas, raising a furnace temperature to melt the pure magnesium to obtain molten magnesium; (3) under protection of mixed gas, raising the furnace temperature, adding at least one of the Mg-30Gd master alloy and the Mg-30Y master alloy, and adding the pure aluminum successively to the molten magnesium, skimming dross off, stirring, and allowing heat preservation to obtain a mixed melt; (4) under protection of mixed gas, lowering the furnace temperature, skimming surface dross off, and adding a refining agent to the mixed melt to obtain a rare earth magnesium alloy melt; (5) under protection of mixed gas, raising the furnace temperature, allowing static heat preservation, and skimming surface dross off to obtain a purified rare earth magnesium alloy melt; (6) under protection of mixed gas, lowering the furnace temperature, and when the purified rare earth magnesium alloy melt is cooled to a casting temperature, skimming surface dross off and casting the purified rare earth magnesium alloy melt into a preheated mold to obtain a rare earth magnesium alloy ingot; and (7) cutting the open shrinkage and surface oxide scale off from the rare earth magnesium alloy ingot, and conducting a hydrogenation treatment in a hydrogenation reactor to obtain the rare earth magnesium alloy based on the high-temperature and high-pressure hydrogenation, wherein in the step (1), the preheating is conducted at 190° C. to 210° C.; in the step (2), the furnace temperature is raised to 730° C. to 750° C.; in the step (3), the furnace temperature is raised to 750° C. to 770° C.; in the step (4), the furnace temperature is lowered to 730° C. to 750° C.; in the step (5), the furnace temperature is raised to 750° C. to 770° C.; in the step (6), the furnace temperature is lowered to 720° C. to 740° C., and during the casting, the purified rare earth magnesium alloy melt is at a temperature of 710° C. to 730° C. and the mold is preheated to 190° C. to 210° C.; in the step (7), the hydrogenation treatment is conducted for 35 h to 45 h at a temperature of 480° C. to 520° C. and a pressure of 0.5 MPa to 10 MPa; in the step (3), the heat preservation is allowed for 10 min to 20 min; in the step (5), the static heat preservation is allowed for 10 min to 15 min; the rare earth magnesium alloy comprises the following elements in mass percentages: 0 wt % to 23.5 wt % of gadolinium; 0 wt % to 12.5 wt % of yttrium; 0.1 wt % to 3 wt % of aluminum; and the balance of magnesium and unavoidable impurities; the rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation comprises at least one of gadolinium and yttrium; and the unavoidable impurities in mass percentages are as follows: less than or equal to 0.01 wt % of iron; less than or equal to 0.0054 wt % of nickel; and less than or equal to 0.005 wt % of copper.

2 . The preparation method of a rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation according to claim 1 , wherein the mixed gas in the steps (2), (3), (4), and (5) each is mixed gas of SF6 and CO2 in 1:(48-52).

3 . The preparation method of a rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation according to claim 1 , wherein in the step (4), the refining agent is JDMJ, and an amount of the refining agent is 1.5% to 2.5% of a total mass of the rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation.

4 . The preparation method of a rare earth magnesium alloy based on high-temperature and high-pressure hydrogenation according to claim 1 , wherein in the step (4), the refining agent is added in three times at an interval of 2 min to 5 min under stirring.

Assignees

• Univ Shanghai Jiaotong

Inventors

• Li Yangxin
• Su Yang
• Zeng Xiaoqin
• Zhou Liping
• Ying Tao
• Shen Zhao

Classifications

• G21F1/08

  Metals; Alloys; Cermets, i.e. sintered mixtures of ceramics and metals · CPC title

• C22C1/02 Primary

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C22C1/03

  using master alloys · CPC title

• C22C23/00

  Alloys based on magnesium · CPC title

• C22C23/06 Primary

  with a rare earth metal as the next major constituent · CPC title