Magnesium alloy plate with low rare earth content and high fatigue performance and preparation method thereof

A fatigue performance, magnesium alloy technology, applied in the field of rare earth-containing magnesium alloys, can solve the problems of poor plastic deformation ability, easy formation of coarse grains, etc., to improve fatigue performance, increase the tendency of basal plane slip, and improve the yield rate Effect

Active Publication Date: 2021-06-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the poor plastic deformation ability of magnesium alloys and the problem of easy formation of coarse grains in the annealing process, the first object of the present invention is to provide a magnesium alloy plate with low rare earth content and high fatigue performance and its preparation method, by reducing Rare earth element content, improved rolling process and heat treatment process, prepared a magnesium alloy plate with uniform structure, less internal defects and high fatigue performance

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  • Magnesium alloy plate with low rare earth content and high fatigue performance and preparation method thereof
  • Magnesium alloy plate with low rare earth content and high fatigue performance and preparation method thereof
  • Magnesium alloy plate with low rare earth content and high fatigue performance and preparation method thereof

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Effect test

Embodiment 1

[0043] This embodiment provides a low rare earth magnesium alloy and a preparation method thereof. The preparation method of the low rare earth magnesium alloy comprises the following steps:

[0044] S1: Put pure Mg ingot and Mg-30wt.%Gd, Mg-25wt.%Y, Mg-30wt.%Nd, Mg-30wt.%Zr master alloy into the melting furnace, preheat the master alloy before melting to remove Moisture in the raw material, grinding to remove the scale in the raw material. Melting and casting low-rare-earth magnesium alloy flat ingot with alloy composition of Mg-5Gd-2Y-1.0Nd-0.5Zr, the melting process is protected by argon, and the size of the flat ingot is 500mm*300mm*50mm;

[0045] S2: Machining the rare earth magnesium alloy flat ingot obtained by smelting and casting to remove surface scale and inclusions, the size of the flat ingot after machining is 480mm*280mm*45mm;

[0046] S3: placing the machined rare earth magnesium alloy flat ingot in an argon-protected holding furnace for uniform heat treatment...

Embodiment 2

[0060] This embodiment provides a low rare earth magnesium alloy and a preparation method thereof. The preparation method of the low rare earth magnesium alloy comprises the following steps:

[0061] S1: Put pure Mg ingot and Mg-30wt.%Gd, Mg-25wt.%Y, Mg-30wt.%Nd, Mg-30wt.%Zr master alloy into the melting furnace, preheat the master alloy before melting to remove Moisture in the raw material, grinding to remove the scale in the raw material. Melting and casting low-rare-earth magnesium alloy flat ingot with alloy composition of Mg-6Gd-2Y-1.0Nd-0.5Zr, the melting process is protected by argon gas, and the size of the flat ingot is 500mm*300mm*50mm;

[0062] S2: Machining the rare earth magnesium alloy flat ingot obtained by smelting and casting to remove surface scale and inclusions, the size of the flat ingot after machining is 480mm*280mm*45mm;

[0063] S3: placing the machined rare earth magnesium alloy flat ingot in an argon-protected holding furnace for uniform heat treat...

Embodiment 3

[0078] This embodiment provides a low rare earth magnesium alloy and a preparation method thereof. The preparation method of the low rare earth magnesium alloy comprises the following steps:

[0079] S1: Put pure Mg ingot and Mg-30wt.%Gd, Mg-25wt.%Y, Mg-30wt.%Nd, Mg-30wt.%Zr master alloy into the melting furnace, preheat the master alloy before melting to remove Moisture in the raw material, grinding to remove the scale in the raw material. Melting and casting low-rare-earth magnesium alloy flat ingot with alloy composition of Mg-6.6Gd-3.2Y-1.0Nd-0.5Zr. The melting process is protected by argon gas. The size of the flat ingot is 500mm*300mm*50mm;

[0080] S2: Machining the rare earth magnesium alloy flat ingot obtained by smelting and casting to remove surface scale and inclusions, the size of the flat ingot after machining is 480mm*280mm*45mm;

[0081] S3: placing the machined rare earth magnesium alloy flat ingot in an argon-protected holding furnace for uniform heat treat...

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Abstract

The invention discloses a magnesium alloy plate with low rare earth content and high fatigue performance and a preparation method of the magnesium alloy plate. The magnesium alloy plate comprises the following components of, in percentage by mass, 5.0-6.6% of Gd, 1.8-3.2% of Y, 0.5-2% of Nd, 0.3-0.7% of Zr and the balance Mg, and meanwhile, the mass ratio of Gd to Y meets the condition that Gd / Y is greater than or equal to 2 and less than or equal to 3. The preparation method of the magnesium alloy plate comprises the following steps that firstly, homogenization heat treatment is carried out on the outer surface of a machined cast ingot, heating is carried out at the rolling reduction of 10-15% per pass after homogenization treatment, annealing is carried out at 500-520 DEG C for 5-10 minutes during each pass, the total rolling reduction is 70-90%, and after solid solution heat treatment is carried out on the rolled plate, artificial aging is carried out to obtain the magnesium alloy plate. According to the magnesium alloy plate with low rare earth content and high fatigue performance and the preparation method, by adjusting the content of rare earth elements and improving the rolling technology and the heat treatment technology, the problems that in the rolling process, cracking is prone to occurring, after rolling, tissues are uneven and the like are solved, and the magnesium alloy plate which is uniform in structure, free of internal defects and high in fatigue performance is prepared.

Description

technical field [0001] The invention relates to the field of rare earth-containing magnesium alloys, in particular to a rare earth magnesium alloy plate with high fatigue performance and a preparation method thereof. The magnesium alloy plate with high fatigue performance can be produced by adjusting and controlling the rolling plate structure through a new process. Background technique [0002] Magnesium alloys have low density, high specific strength, high specific stiffness, and excellent damping properties, so they have broad application prospects in fields such as automobiles, aerospace, and weaponry that urgently need to reduce weight to improve fuel efficiency. However, the current commercial magnesium alloys, such as AZ31, AZ80, etc., have low absolute strength and poor heat resistance, which greatly limits the wide application of magnesium alloys. Therefore, ultra-high-strength and high-temperature-resistant rare-earth magnesium alloys have gradually aroused the int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/06C22F1/06
CPCC22C23/00C22F1/06
Inventor 郭晓斌邓运来罗安张勇姜科达王冯权谭桂薇姜伟
Owner CENT SOUTH UNIV
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