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Erbium strengthened magnesium-lithium alloy and preparation method thereof

A technology of magnesium-lithium alloys and alloying elements, applied in the field of magnesium-lithium alloys

Active Publication Date: 2017-05-17
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no public report on the influence of magnesium-lithium alloy composition design, heat treatment and deformation process on its mechanical properties.

Method used

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  • Erbium strengthened magnesium-lithium alloy and preparation method thereof
  • Erbium strengthened magnesium-lithium alloy and preparation method thereof
  • Erbium strengthened magnesium-lithium alloy and preparation method thereof

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Effect test

Embodiment 1

[0039] This embodiment is an erbium-strengthened magnesium-lithium alloy and its preparation method. The chemical composition is: Li: 8.21%, Al: 3.12%, Er: 2.94%, and the rest is Mg and unavoidable impurities. The homogenization treatment temperature is 240°C, and the treatment time is 2h. The aging temperature before rolling is 200°C, the holding time is 4h, and air-cooled to room temperature. The rolling temperature is 320°C, rolling 5 passes, with an average reduction of 27% each time, and a total reduction of 80%. No post-rolling aging treatment. Its mechanical properties are significantly improved, and its yield strength, tensile strength and elongation are respectively 9.2%, 19.2% and 20% higher than those of the Mg-Li-Al alloy. Metallographic photos see figure 2 , the mechanical properties of alloy materials see Figure 5 Table 1.

Embodiment 2

[0041] This embodiment is an erbium-strengthened magnesium-lithium alloy and its preparation method. The chemical composition is: Li: 8.21%, Al: 3.12%, Er: 2.94%, and the rest is Mg and unavoidable impurities. The homogenization treatment temperature is 240°C, and the treatment time is 2h. The aging temperature before rolling is 200°C, the holding time is 4h, and air-cooled to room temperature. The rolling temperature is 320°C, rolling 5 passes, with an average reduction of 27% each time, and a total reduction of 80%. The post-rolling aging treatment temperature is 180°C, the treatment time is 8h, and air-cooled to room temperature. Its mechanical properties are significantly improved, and its yield strength, tensile strength and elongation are respectively 11.3%, 23.9% and 1.3% higher than those of the Mg-Li-Al alloy. Metallographic photos see image 3 , the mechanical properties of alloy materials see Figure 5 Table 1.

Embodiment 3

[0043]This embodiment is an erbium-strengthened magnesium-lithium alloy and its preparation method. The chemical composition is: Li: 8.21%, Al: 3.12%, Er: 2.94%, and the rest is Mg and unavoidable impurities. The homogenization treatment temperature is 240°C, and the treatment time is 2h. The aging temperature before rolling is 200°C, the holding time is 4h, and air-cooled to room temperature. The rolling temperature is 320°C, rolling 5 passes, with an average reduction of 27% each time, and a total reduction of 80%. The post-rolling aging treatment temperature is 180°C, the treatment time is 8h, and the quenching water is cooled to room temperature. Its mechanical properties are significantly improved, and its yield strength, tensile strength and elongation are respectively 16.2%, 28.7% and 39.1% higher than those of the Mg-Li-Al alloy. Metallographic photos see Figure 4 , the mechanical properties of alloy materials see Figure 5 Table 1.

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Abstract

The invention provides erbium strengthened magnesium-lithium alloy and a preparation method thereof. The magnesium-lithium alloy prepared through the following method comprises, by mass, 5%-11% of Li, 0.5%-10% of Er, not more than 5% of Al and the balance magnesium and inevitable impurity elements. The preparation method comprises the steps that (1) smelting is conducted under the condition of vacuum or protective atmosphere after component proportioning is designed according to the alloy elements, and then an alloy ingot is poured; (2) homogenization treatment is conducted at the temperature of 200 DEG C-500 DEG C, and the homogenization treatment time is 0.5-10 h; (3) multi-pass rolling is conducted at the temperature of 250 DEG C-400 DEG C, and the total reduction rate is 20%-90%; and (4) two times of aging treatment can also be conducted before and after rolling. According to the erbium strengthened magnesium-lithium alloy and the preparation method thereof, the alloy components, the two times of aging treatment temperature, the treatment time, the cooling process, the hot rolling temperature, the hot rolling passes and the deformation parameters are controlled, so that the grain size of the erbium strengthened magnesium-lithium alloy is refined, and the mechanical property is improved.

Description

technical field [0001] The invention relates to a magnesium-lithium alloy, and the invention also relates to a preparation method of the magnesium-lithium alloy. Background technique [0002] Magnesium alloy has excellent comprehensive performance, so it is widely used in aerospace, automobile, electronics and other industrial fields as an important light alloy material. However, since the magnesium alloy has a hexagonal close-packed structure (HCP), its slip system is less. As a result, its mechanical properties such as room temperature plasticity and strength are poor, which seriously limits the large-scale and wide application of magnesium alloys. [0003] In order to improve the mechanical properties of magnesium alloys, lithium, aluminum, rare earth and other elements are usually added to the magnesium alloy matrix. The addition of Li element can further reduce the alloy density and improve the plasticity of the alloy. The microstructure of the magnesium alloy is opt...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02C22F1/06
CPCC22C1/02C22C23/00C22F1/06
Inventor 张中武崔烨穆佳陈丹张洋
Owner HARBIN ENG UNIV
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