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High-strength and high-corrosion-resistance rare earth magnesium alloy and preparation method thereof

A technology of high corrosion resistance and rare earth magnesium, applied in the field of non-ferrous metal processing, can solve the problem of insufficient strength, achieve the effect of improving quality, improving strength and plasticity, and increasing strength

Active Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In view of the fact that the strength of the existing magnesium alloy materials is not high enough, it is urgent to propose a new magnesium alloy and its preparation method

Method used

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  • High-strength and high-corrosion-resistance rare earth magnesium alloy and preparation method thereof
  • High-strength and high-corrosion-resistance rare earth magnesium alloy and preparation method thereof

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preparation example Construction

[0026] The preparation method of the high-strength and high-corrosion-resistant rare earth magnesium alloy plate of the present invention comprises the following steps:

[0027] Step 1, weighing by mass percentage: aluminum: 6%-8%, mixture of yttrium and gadolinium: 0.4%-0.6%, manganese: 0.2%-0.5%, mixture of lanthanum, cerium and neodymium: 0.2%-0.6 %, and the rest is magnesium; among them, the content of yttrium is 0.2%-0.3% of the mass of high-strength and high-corrosion-resistant rare-earth magnesium alloy, the content of gadolinium is 0.2%-0.3% of the mass of high-strength and high-corrosion-resistant rare-earth magnesium alloy, and the content of lanthanum is The content is 0.05%-0.2% of the mass of high-strength and high-corrosion-resistant rare-earth magnesium alloy, the content of cerium is 0.05%-0.2% of the mass of high-strength, high-corrosion-resistant rare-earth magnesium alloy, and the content of neodymium is high-strength and high-corrosion-resistant rare-earth m...

Embodiment 1

[0039] The preparation method of the high-strength and high-corrosion-resistant rare earth magnesium alloy plate in this embodiment includes the following steps:

[0040] Step 1, take aluminum by weight percentage: 6%, the mixture of yttrium and gadolinium: 0.4%, manganese: 0.2%, the mixture of lanthanum, cerium and neodymium: 0.2%, the rest is magnesium; wherein, the content of yttrium is 0.2% %, the content of gadolinium is 0.2%, the content of lanthanum is 0.05%, the content of cerium is 0.05%, and the content of neodymium is 0.1%;

[0041] Step 2, put the raw materials weighed in step 1 into the melting furnace, add covering agent and refining agent for protection, heat up to 750°C to obtain the molten liquid and keep it warm for 15 minutes, cool down the molten liquid to 720°C and let it stand for 5 minutes, and cast to obtain half Continuous magnesium alloy ingot casting;

[0042] Step 3, keeping the semi-continuous magnesium alloy ingot prepared in step 2 at 380° C. fo...

Embodiment 2

[0049] The preparation method of the high-strength and high-corrosion-resistant rare earth magnesium alloy plate in this embodiment includes the following steps:

[0050] Step 1, weigh aluminum: 6.5%, the mixture of yttrium and gadolinium: 0.45%, manganese: 0.3%, the mixture of lanthanum, cerium and neodymium: 0.25% by weight percentage, and the rest is magnesium; wherein, the content of yttrium is 0.23 %, the content of gadolinium is 0.22%, the content of lanthanum is 0.1%, the content of cerium is 0.1%, and the content of neodymium is 0.05%;

[0051] Step 2, put the raw materials weighed in step 1 into the melting furnace, add covering agent and refining agent for protection, heat up to 760°C to obtain a molten liquid and keep it warm for 17 minutes, cool down the molten liquid to 723°C and let it stand for 7 minutes, and cast to obtain half Continuous magnesium alloy ingot casting;

[0052] Step 3, keeping the semi-continuous magnesium alloy ingot prepared in step 2 at 390...

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Abstract

The invention discloses a high-strength and high-corrosion-resistance rare earth magnesium alloy plate and a preparation method thereof. The high-strength and high-corrosion-resistance rare earth magnesium alloy plate comprises the following components in percentage by mass: 6-8% of aluminum, 0.4-0.6% of heavy rare earth elements, 0.2-0.5% of manganese, 0.2-0.6% of light rare earth elements, and the balance of magnesium. The preparation method comprises the following steps that: the raw materials are mixed and heated to 750-780 DEG C for insulation by 15-20min, and are cooled to 720-730 DEG C for standing by 5-10min; a magnesium alloy cast ingot is obtained by a semi-continuous casting method; the cast ingot is peeled to obtain a heat treatment cast rod after solution treatment by 8-12h at 380-410 DEG C; the heat treatment cast rod is pre-extruded; the extruded plate is hot-rolled by 9-11 times; the single rolling reduction is 8-10% of rolling deformation; and the rolled plate is annealed to obtain the high-strength and high-corrosion-resistance rare earth magnesium alloy plate. The rare earth magnesium alloy plate has the advantages of high strength, high corrosion resistance and low cost; and the preparation method is simple in flow, high in efficiency and high in yield.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and relates to a high-strength, high-corrosion-resistant rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is currently the lightest structural material in engineering applications. It also has high specific strength, specific modulus, good casting and machining properties, so it has broad application prospects. However, compared with aluminum alloys, the strength of magnesium alloys is still low. For rolled plates, the strength of commercial AZ31 plates is only about 180MPa. However, AZ91 is often used to prepare high-strength die-castings. If it is used to prepare rolled plates, there will often be cracks at the processing edges, resulting in low yields, and it is not suitable for preparing wide-width rolled plates. Some data report that the yield strength of AZ91D plate is even lower than that of AZ31B rolled plate....

Claims

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Application Information

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IPC IPC(8): C22C23/02C22C1/02C22F1/06
CPCC22C23/02C22C1/02C22F1/06
Inventor 房大庆韩呈祥邓俊楷张晓茹付伟吴颖丁向东孙军
Owner XI AN JIAOTONG UNIV
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