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A kind of mg-gd-y-nd high strength and toughness rare earth magnesium alloy and preparation method thereof

A mg-gd-y-nd, rare earth magnesium technology, applied in the field of alloys, can solve the problems of restricting the development and application of alloys, high preparation difficulty and cost, and large hot cracking tendency of alloys, so as to reduce internal structure defects and optimize casting molding. and extrusion molding process, the effect of simplifying alloy species

Active Publication Date: 2022-03-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The magnesium alloy has good yield strength and tensile strength, but poor plasticity
In addition, the high rare earth content of the Mg-Gd-Y-Zr system alloy also leads to a greater tendency of the alloy to hot crack, and the difficulty and cost of preparation are high, which further limits the development and application of the alloy.

Method used

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  • A kind of mg-gd-y-nd high strength and toughness rare earth magnesium alloy and preparation method thereof
  • A kind of mg-gd-y-nd high strength and toughness rare earth magnesium alloy and preparation method thereof
  • A kind of mg-gd-y-nd high strength and toughness rare earth magnesium alloy and preparation method thereof

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preparation example Construction

[0038] According to the composition characteristics of alloying elements of the Mg-Gd-Y-Nd high-strength and tough rare earth magnesium alloy of the present invention, a targeted casting and molding preparation method is provided to obtain optimal mechanical properties and microstructure morphology, and The lowest elemental depletion rate, including the following steps:

[0039] Step 1. Preparation of Magnesium Alloy Ingot

[0040] Using pure Mg, pure Zn, pure Ag, Mg-Zr master alloy, Mg-Gd master alloy, Mg-Y master alloy, Mg-Nd master alloy, Mg-Sc master alloy as raw materials, according to Mg-Gd-Y-Nd high strength The mass percentage of each element of the ductile rare earth magnesium alloy is batched, smelted to obtain alloy liquid, cast and formed, and a casting is obtained;

[0041] Step 2, solid solution treatment

[0042] Heat-treat the casting at 500-520°C for 6-12 hours, then air-cool to room temperature to obtain the casting after solution treatment;

[0043] Step ...

Embodiment 1

[0062] Mg-Gd-Y-Nd high strength and toughness rare earth magnesium alloy: Gd: 6.5wt.%, Y: 1.5wt.%, Nd: 1.5wt.%, Ag: 0.5wt.%, Sc: 0.05wt.%, Zr: 0.45wt.%, Zn: 0.2wt.%, the balance is Mg and unavoidable impurities.

[0063] The preparation method of the above-mentioned Mg-Gd-Y-Nd high strength and toughness rare earth magnesium alloy:

[0064] Step 1, according to the mass percentage of each element of the Mg-Gd-Y-Nd high strength and toughness rare earth magnesium alloy, weigh pure Mg, pure Zn, pure Ag, Mg-Zr master alloy, Mg-Gd master alloy (20 ~ 30wt. %), Mg-Y master alloy (20~30wt.%), Mg-Nd master alloy (20~30wt.%) and Mg-Sc master alloy (1~3wt.%), cleaning, drying, smelting, and Preheat to 300°C;

[0065] in CO 2 and SF 6 Under the protection of mixed gas (volume ratio: 99.8:0.2), pure Mg, pure Zn, pure Ag, Mg-Gd master alloy (20~30wt.%), Mg-Y master alloy (20~30wt.%) And Mg-Nd master alloy (20~30wt.%) is heated to 680~750°C until completely melted, and then the melt is...

Embodiment 2

[0069] Mg-Gd-Y-Nd high strength and toughness rare earth magnesium alloy: Gd: 8wt.%, Y: 2wt.%, Nd: 2wt.%, Ag: 0.4wt.%, Sc: 0.07wt.%, Zr: 0.45wt. %, Zn: 0.2wt.%, the balance is Mg and unavoidable impurities.

[0070] The preparation method is the same as that of Example 1, except that step 3 is replaced by: heat-treating the casting at 250° C. for 24 hours, and then air-cooling to room temperature to obtain a solution-treated casting.

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Abstract

A Mg‑Gd‑Y‑Nd high-strength rare earth magnesium alloy and a preparation method thereof belong to the field of alloy technology. The invention solves the problems that the existing rare earth magnesium alloys have low plasticity, large thermal cracking tendency, high preparation difficulty and high cost. The Mg-Gd-Y-Nd high-strength rare earth magnesium alloy of the present invention has a chemical composition in terms of mass percentage: Gd: 6.5-10wt.%, Y: 1.5-2.5wt.%, Nd: 1.5-2.5wt.%. , Ag: 0.2~0.5wt.%, Sc: 0.05~0.1wt.%, Zr: 0.35~0.55wt.%, Zn: 0~0.3wt.%, the balance is Mg; and the quality of Gd, Y, Nd The ratio is (4~4.3):1:1. The rare earth magnesium alloy has excellent room temperature and high temperature strength and plasticity, low cost and low preparation difficulty.

Description

technical field [0001] The invention belongs to the field of alloy technology, and in particular relates to a Mg-Gd-Y-Nd high-strength and tough rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest metal structural material in engineering applications. It has the advantages of low density, high specific strength, high specific stiffness, high shock absorption, easy processing, and easy recycling. It is widely used in aerospace, military industry, electronic communication, transportation and other fields. There is a huge application market. [0003] Rare earth magnesium alloys generally refer to magnesium alloys containing rare earth elements (RE). Adding rare earth elements—Gd, Y, and Zr to magnesium alloys can significantly refine the grain size of the structure and improve the corrosion resistance and mechanical properties of magnesium alloys. The Mg-Gd-Y-Zr system alloy is the rare earth magnesium all...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06C22C1/03C22F1/06
CPCC22C23/06C22C1/03C22F1/06
Inventor 邱鑫田政杨强孙伟孟健
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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