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Er-contained magnesium alloy and preparation method thereof

A technology for magnesium alloys and alloy ingots, applied in the field of alloys and preparations, Er-containing magnesium alloys and preparations, can solve the problems of reducing alloy plasticity, crack initiation, difficulty in casting magnesium alloys with high strength and high plasticity, etc., to achieve increased strength, Improve mechanical properties, good solid solution strengthening effect

Active Publication Date: 2019-12-27
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Usually, the increase of alloy strength is often accompanied by the decrease of plasticity, so it is difficult to obtain high-strength and high-plasticity cast magnesium alloys at the same time.
This is due to the existence of the second phase particles, which intensifies the accumulation of dislocations and improves the strength of the alloy, but also promotes the initiation of cracks and reduces the plasticity of the alloy.
To a large extent, the industrial application of the alloy is limited

Method used

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  • Er-contained magnesium alloy and preparation method thereof
  • Er-contained magnesium alloy and preparation method thereof
  • Er-contained magnesium alloy and preparation method thereof

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preparation example Construction

[0023] The preparation method of the above-mentioned Er-containing magnesium alloy includes the following steps: a. melting, b. homogenization treatment, c. deformation, d. aging treatment.

[0024] a. Smelting: According to the atomic percentage composition: Er 0.2-2.0%, Y 0.2-2.0%, Zn 0.2-2.0%, the rest is Mg and unavoidable impurities, smelting under vacuum or protective atmosphere conditions, and then casting the alloy ingots or cast directly into castings.

[0025] b. Homogenization: Homogenize and anneal the above alloy ingot at 300-550°C for 0.5-20h.

[0026] c. Deformation: The deformation temperature ranges from 250°C to 400°C, and the total deformation rate is 20-90%. Multiple deformations can be performed, followed by quenching and rapid cooling.

[0027] d. Aging treatment: the temperature range is 150°C-300°C, and the aging time range is 0.1-200h.

Embodiment 1

[0029] The chemical composition of the rare earth magnesium alloy in this embodiment is: 0.5% Er, 1% Y, 1% Zn, and the rest is Mg and unavoidable impurities. Add pure magnesium ingots, raise the furnace temperature to 720-740°C and feed SF 6 :CO 2 Protective gas with a volume ratio of 1:200. After the magnesium ingot is completely melted, skim off the scum on the surface of the melt, and then add Mg-20Y master alloy and Mg-30Er master alloy in sequence. The furnace temperature rises to 750°C, and the master alloy is added. After it is completely melted, keep it warm for 15-20 minutes, pour it into a preheated mold and cast it into an alloy ingot. Its mechanical properties at room temperature have been tested: the tensile strength is 234MPa, the yield strength is 152MPa, and the elongation is 13%.

Embodiment 2

[0031] The chemical composition of the rare earth magnesium alloy in this embodiment is: 1% Er, 1% Y, 1% Zn by atomic percentage, and the rest is Mg and unavoidable impurities. Add pure magnesium ingots, raise the furnace temperature to 720-740°C and feed SF 6 :CO 2 Protective gas with a volume ratio of 1:200. After the magnesium ingot is completely melted, skim off the scum on the surface of the melt, and then add Mg-20Y master alloy and Mg-30Er master alloy in sequence. The furnace temperature rises to 750°C, and the master alloy is added. After it is completely melted, keep it warm for 15-20 minutes, pour it into a preheated mold and cast it into an alloy ingot. Its mechanical properties at room temperature have been tested: the tensile strength is 229MPa, the yield strength is 147MPa, and the elongation is 17%.

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Abstract

The invention provides an Er-contained magnesium alloy and a preparation method thereof. The Er-contained magnesium alloy comprises the following components of, in percentage by atom, 0.2%-2.0% of Er,0.2%-2.0% of Y, 0.2%-2.0% of Zn and balance Mg and inevitable impurities. The method comprises the following steps of smelting, homogenizing treatment, deformation and aging treatment. According to the alloy and the method, the content the distribution in the magnesium alloy of a long-period ordered structural phase can be adjusted through the addition of the Er, and a precipitated phase can prevent a basal plane from dislocation glide, so that the strength of the alloy is improved; a LPSO phase and a magnesium matrix phase are in a coherency relationship, and the crack growth can be prevented, so that the plasticity of the alloy is improved; the Er and the magnesium have similar atomic radii, and a good solid solution strengthening effect is achieved by adding the Er in the Mg matrix; and W phases and the distribution of the W phases in the alloy can be effectively adjusted through addition of the Er, and the second phases all play dislocation glide prevention roles, so that the mechanical property of the alloy can be effectively adjusted and controlled through the addition of the Er.

Description

technical field [0001] The invention relates to an alloy and a preparation method, in particular to an Er-containing magnesium alloy and a preparation method, and belongs to the technical field of metal materials. Background technique [0002] As the lightest engineering metal material at present, magnesium alloy has a series of unique advantages such as high specific strength, high specific stiffness, good damping and vibration reduction, strong electromagnetic shielding and thermal conductivity, easy cutting and easy recycling, etc. It has a wide range of application backgrounds in modern industries such as computers, communications, and consumer electronics. However, magnesium alloys are often widely used in production and life due to low strength and poor plasticity. Therefore, improving the plasticity and strength of magnesium alloys is an important direction for the development of magnesium alloy materials. [0003] Usually, the increase of alloy strength is often ac...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22C23/06C22C1/03C22F1/06
CPCC22C23/04C22C23/06C22C1/03C22F1/06C22F1/002
Inventor 崔烨张中武范明雨韩佳澍陈丹张洋孙利昕
Owner HARBIN ENG UNIV
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