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Method for rapidly eliminating element segregation in rare earth magnesium alloy by using pulse current

A pulsed current and rare earth element technology, applied in the field of element segregation, can solve the problems of the rare earth magnesium alloy homogenization refining, complex processing process, affecting refining process, etc. Effect

Active Publication Date: 2021-12-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] The technical problem solved by the present invention is that the existing homogenization treatment method of rare earth magnesium alloy is not suitable for the segregation of gadolinium (Gd) element at the grain boundary of rare earth magnesium alloy with rare earth element gadolinium (Gd) as the main alloying element Elimination, there are defects such as complex processing process, high cost, difficult operation, affecting other refining processes, and not being environmentally friendly, which cannot completely solve the problem of homogeneous refining of rare earth magnesium alloys

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  • Method for rapidly eliminating element segregation in rare earth magnesium alloy by using pulse current

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Effect test

Embodiment 1

[0045] In this embodiment, pulse current treatment is performed on the rare earth magnesium alloy. Specific steps are as follows:

[0046] S1: Smelting a rare earth magnesium alloy with the rare earth element gadolinium (Gd) as the main alloying element. Put the dried magnesium alloy into the crucible, add RJ-2 covering agent, and raise the temperature of the crucible to 760°C through two stages of slow heating (180°C / h) and rapid heating (280°C / h) for a total of 3 hours.

[0047] S2: Determine pulse current processing parameters. The range of pulse current processing parameters is set, and the pulse current parameters are determined to be 31000Hz, 30μs, 80A, and the action time is 10min.

[0048] S3: Pulse current processing. Insert the prepared steel electrodes into both sides of the crucible symmetrically, confirm that the electrodes are inserted into the melt by 3mm; connect the pulse current generator, and perform 10min pulse current treatment.

[0049] S4: Conduct SE...

Embodiment 2

[0051] In this embodiment, pulse current treatment is performed on the rare earth magnesium alloy. Specific steps are as follows:

[0052] S1: Smelting a rare earth magnesium alloy with the rare earth element gadolinium (Gd) as the main alloying element. Put the dried magnesium alloy into the crucible, add RJ-2 covering agent, and raise the temperature of the crucible to 760°C through two stages of slow heating (180°C / h) and rapid heating (280°C / h) for a total of 3 hours.

[0053] S2: Determine pulse current processing parameters. The parameter range of the pulse current is set, and the pulse current parameter is determined to be 31000Hz, 30μs, 60A, and the action time is 15min.

[0054] S3: Pulse current processing. Insert the prepared steel electrodes into both sides of the crucible symmetrically, confirm that the electrodes are inserted into the melt by 3mm; connect the pulse current generator, and perform 15min pulse current treatment.

[0055] S4: Conduct SEM scanning...

Embodiment 3

[0057] In this embodiment, pulse current treatment is performed on the rare earth magnesium alloy. Specific steps are as follows:

[0058] S1: Smelting a rare earth magnesium alloy with the rare earth element gadolinium (Gd) as the main alloying element. Put the dried magnesium alloy into the crucible, add RJ-2 covering agent, and raise the temperature of the crucible to 760°C through two stages of slow heating (180°C / h) and rapid heating (280°C / h) for a total of 3 hours.

[0059] S2: Determine pulse current processing parameters. The parameter range of the pulse current is set, and the pulse current parameter is determined to be 31000Hz, 30μs, 80A, and the action time is 5min.

[0060] S3: Pulse current processing. Insert the prepared steel electrodes into both sides of the crucible symmetrically, confirm that the electrodes are inserted into the melt by 10mm; connect the pulse current generator, and perform 5min pulse current treatment.

[0061] S4: Conduct SEM scanning ...

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Abstract

The embodiment of the invention discloses a method for rapidly eliminating element segregation in a rare earth magnesium alloy by using pulse current, and belongs to the technical field of rare earth magnesium alloy homogenization refining. The method specifically comprises the following steps that S1, smelting is carried out on the rare earth magnesium alloy with rare earth element gadolinium (Gd) as the main alloy element; S2, pulse current processing parameters are determined; S3, pulse current treatment is carried out; and S4, SEM observation is carried out on different positions of the rare earth magnesium alloy subjected to pulse current treatment, and segregation conditions of rare earth elements at different positions are obtained. Compared with the rare earth magnesium alloy which is not homogenized, through the method, various properties of the rare earth magnesium alloy can be greatly improved in a short time, and the utilization rate of rare earth is increased; and compared with other homogenization modes, the method is short in treatment time, simple in equipment and better in effect, does not need assistance of other modes, can independently act to achieve the homogenization effect, can further act together with other modes without mutual influence, and reduces the cost of industrial conversion.

Description

technical field [0001] The invention belongs to the technical field of homogeneous refining of rare earth magnesium alloys, and relates to a method for rapidly eliminating element segregation in rare earth magnesium alloys by using pulse current. Background technique [0002] The continuous development of the aerospace industry has made the demand for high-performance materials more and more urgent. As the lightest structural metal material in practical engineering applications, magnesium alloy has the advantages of low density, high specific strength, high specific stiffness, and excellent shock absorption performance. It is suitable for applications in fields such as aerospace that require high material weight reduction. [0003] However, the corrosion resistance and high temperature performance of ordinary magnesium alloys are poor, and the application range is very limited. Rare-earth magnesium alloys are more widely used in the aerospace field due to their improved cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C23/00C22B9/00
CPCC22C1/02C22C23/00C22B9/00
Inventor 张新房冯莹
Owner UNIV OF SCI & TECH BEIJING
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