High-toughness single-phase solid solution magnesium rare earth-based alloy at room temperature and preparation method thereof

A solid solution, rare earth-based technology, applied in the field of magnesium alloy and its preparation, can solve the problems of obvious hot cracking tendency, decreased alloy corrosion resistance, narrow processing temperature range, etc., achieve outstanding mechanical properties and processing performance, and improve deformation processing performance. , The effect of excellent corrosion resistance

Inactive Publication Date: 2011-12-14
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnesium-aluminum alloys are the most commonly used deformation systems, however, this type of alloy has a strong basal texture, significant asymmetry and a relatively narrow processing temperature range
Since the eutectic temperature of magnesium-aluminum alloy is 437 ℃, the hot working temperature is usually lower than 350 ℃, so the deformation speed is low and the product production cost is high
On the other hand, if a high temperature is chosen (over 350 °C), the eutectic phase dissolves, leading to alloy hot cracking and reduced surface quality [K.U. Kainer, Magnesium Alloys and Technologies, WILEY-VCH Verlag GmbH, Weiheim, 2003]
Because magnesium-zinc series does not contain aluminum, its structure can be effectively refined by adding Zr. However, this type of alloy is easy to form cast

Method used

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  • High-toughness single-phase solid solution magnesium rare earth-based alloy at room temperature and preparation method thereof
  • High-toughness single-phase solid solution magnesium rare earth-based alloy at room temperature and preparation method thereof
  • High-toughness single-phase solid solution magnesium rare earth-based alloy at room temperature and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] According to the composition of Mg-0.5RE-1.5Sc-0.01Ag (wt.%), the mass ratio of raw materials is carried out, magnesium is the balance, and the mass fraction ratio of Gd, Y, Dy, Er and Tm in RE is equal, and the ratio of all raw materials The mass purity is: 99.5% Mg ingot, 99% Mg-20wt.%RE master alloy ingot, 99% Sc ingot and 99.99% Ag ingot. First remove the surface scale of the above-mentioned metal ingots and intermediate alloy ingots. The intermediate alloy ingots must be fully preheated at 200°C, and then the metal Mg ingots, Mg-RE intermediate alloy ingots, Sc ingots and Ag ingots are added to the automatic ingot in sequence. In a temperature-controlled resistance furnace, the melting temperature is 700°C, protected by a 1:19 mixture of sulfur hexafluoride and argon, and stirring for 10 minutes each time a raw material is added; after all the raw materials are added, stir for another 30 minutes; 770°C is poured into the steel mold, and the steel mold should be pre...

Embodiment 2

[0021] The mass ratio of raw materials is carried out according to the composition of Mg-2RE-1Zn-0.2Ag-0.2Zr (wt.%), and magnesium is the balance. The mass fraction ratios of Gd, Y and Lu in RE are equal, and the mass purity of all raw materials are: 99.5% Mg ingot, 99% Mg-20wt.%RE master alloy ingot, 99.9% Zn ingot, 99.99% Ag ingot and 99% Mg-33.3wt.%Zr master alloy ingot. First remove the surface scale of the above metal ingots and intermediate alloy ingots. The intermediate alloy ingots must be fully preheated at 400°C, and then the metal Mg ingots, Zn ingots, Mg-RE intermediate alloy ingots, Ag ingots and Mg- Add the Zr master alloy ingot into the automatic temperature control resistance furnace, the melting temperature is 680°C, and use the mixed gas protection of sulfur hexafluoride and argon at 1:19. Each time a raw material is added, stir for 10 minutes; after all the raw materials are added, Stir for another 30 minutes; pour into the steel mold at 650°C, and the stee...

Embodiment 3

[0023] The mass ratio of raw materials is carried out according to the composition of Mg-3RE-0.1Zn-0.05Ag-0.05Zr, and magnesium is the balance. The mass fraction ratio of Gd and Y in RE is equal, and the mass purity of all raw materials are: 99.5% Mg ingot, 99% Mg-20wt.%RE master alloy ingot, 99.9% Zn ingot, 99.99% Ag ingot And 99% Mg-33.3wt.%Zr master alloy ingot. First remove the surface oxide skin of the above-mentioned metal ingots and intermediate alloy ingots. The intermediate alloy ingots must be fully preheated at 250°C, and then the metal Mg ingots, Zn ingots, Mg-RE intermediate alloy ingots, Ag ingots and Mg -Zr master alloy ingots are added to an automatic temperature-controlled resistance furnace with a melting temperature of 750°C, protected by a 1:19 mixture of sulfur hexafluoride and argon, and stirring for 10 minutes each time a raw material is added; after all raw materials are added , and then stirred for 30 minutes; poured into the steel mold at 660°C, the ...

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Abstract

The invention relates to a high-temperature single-phase solid-solution magnesium rare earth base alloy of which the chemical composition is Mg-xRE-y(Zn+Sc)-z(Ag+Zr), wherein x is more than or equal to 0.5 and less than or equal to 3.0, y is more than or equal to 0.1 and less than or equal to 1.5, z is more than or equal to 0.01 and less than or equal to 1.0 (wt%), and rare earth elements comprise Gd, Y, Dy, Er, Tm and Lu. A preparation method mainly comprises the following steps of: adding the raw materials into an automatic temperature-controlled resistance furnace, protecting the raw materials by using a mixed gas of sulfur hexafluoride and argon, smelting the raw materials at the temperature of 680-800 DEG C, pouring the melt in a steel mold at the temperature of 650-770 DEG C, fully preheating the steel mold at the temperature of 500-600 DEG C, insulating the steel mold in a 650-750 DEG C furnace for 30-120 min after pouring, and cooling the steel mold by using water to room temperature. The single-phase solid-solution magnesium rare earth base alloy provided by the invention has small grain size, good ductility, room temperature elongation coefficient exceeding 20%, excellent mechanical properties and processing properties and excellent corrosion resistance.

Description

technical field [0001] The invention relates to a metal material and a preparation method thereof, in particular to a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy has the advantages of light specific gravity, high specific strength and specific stiffness, good damping and machinability, good thermal conductivity, strong electromagnetic shielding ability, good vibration damping and easy recycling, which meets the weight reduction requirements of aviation, aerospace and modern automobile industries. , energy-saving requirements, known as "21st century green engineering materials". [0003] At present, the wrought magnesium alloys mainly include magnesium-aluminum alloys, magnesium-zinc alloys and magnesium rare earth alloys. Magnesium-aluminum alloys are the most commonly used deformation systems, however, this type of alloy has a strong basal texture, significant asymmetry and a relatively narrow processing temperature rang...

Claims

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Application Information

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IPC IPC(8): C22C23/06C22C1/03
Inventor 彭秋明朱键卓田永君
Owner YANSHAN UNIV
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