A kind of 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 magnesium alloys, can solve the problems of easy formation of coarse grains, poor plastic deformation ability, etc., to increase the sliding tendency of the base surface, improve the fatigue performance, and significantly improve the strength Effect

Active Publication Date: 2022-05-20
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

Method used

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  • A kind of magnesium alloy plate with low rare earth content and high fatigue performance and preparation method thereof
  • A kind of magnesium alloy plate with low rare earth content and high fatigue performance and preparation method thereof
  • A kind of 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 thereof. The magnesium alloy plate is composed as follows in terms of mass percentage: Gd: 5.0-6.6%, Y: 1.8-3.2%, Nd: 0.5-3.2%. 2%, Zr: 0.3‑0.7%, and the rest is Mg; at the same time, the mass ratio of Gd to Y satisfies: 2≤Gd / Y≤3. Its preparation method is as follows: firstly carry out homogenization heat treatment on the outer surface of the machined ingot, after the homogenization treatment, carry out heat treatment with a reduction of 10%-15% per pass, and during each pass at 500-520 Annealing at ℃ for 5-10 minutes, the total reduction is 70-90%. It is obtained by subjecting the rolled plate to solution heat treatment and artificial aging. The present invention adjusts the content of rare earth elements, improves the rolling process and heat treatment process, solves the problems of easy cracking in the rolling process and uneven structure after rolling, and prepares a magnesium alloy with uniform structure, no internal defects and high fatigue performance sheet.

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 Patents(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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