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Er-contained quasi-crystal reinforced magnesium-lithium alloy and preparation method thereof

A magnesium-lithium alloy and quasi-crystal technology, applied in the field of metal structural materials, achieves the effect of small segregation of Zr element, strong resistance to decay, and high yield of Zr element

Active Publication Date: 2018-08-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no research report on the addition of Er element to Mg-Li-Zn magnesium-lithium alloys.

Method used

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  • Er-contained quasi-crystal reinforced magnesium-lithium alloy and preparation method thereof

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Embodiment 1

[0023] This embodiment relates to a quasicrystal strengthened magnesium-lithium alloy containing Er. The Mg-Li-Zn-Er-Zr magnesium-lithium alloy contains the following components in mass percentage: Li 10%, Zn 0.5%, Er 0.2 %, Zr 0.3%, the total amount is less than 0.02wt.% by mass percentage of Si, Fe, Cu and Ni and other unavoidable impurities, and the balance is Mg. Wherein, the mass ratio of Zn and Er is 2.5:1, and Zr is represented by ZrCl 4 Mixed salt is 72% ZrCl 4 -12%LiCl-4%LiF-12%CaF 2 (mass percentage) added.

[0024] This embodiment also relates to a method for preparing the aforementioned Mg-Li-Zn-Er-Zr magnesium-lithium alloy: the method includes two stages of smelting and heat treatment.

[0025] Wherein, the smelting process includes the following steps: melting each component of the alloy according to the ratio and then raising the temperature to 720° C., mechanically stirring for 2 minutes, standing for 3 minutes for heat preservation, and then casting.

[0...

Embodiment 2

[0029] This embodiment relates to a quasicrystal strengthened magnesium-lithium alloy containing Er. The Mg-Li-Zn-Er-Zr magnesium-lithium alloy contains the following components in mass percentage: Li 13%, Zn 6%, Er 3 %, Zr 0.1%, the total amount is less than 0.02wt.% by mass percentage of inevitable impurities such as Si, Fe, Cu and Ni, and the balance is Mg. Wherein, the mass ratio of Zn and Er is 2:1, Zr is ZrCl 4 Mixed salt is 65% ZrCl 4 -15%LiCl-5%LiF-15%CaF 2 (mass percentage) added.

[0030] This embodiment also relates to a method for preparing the aforementioned Mg-Li-Zn-Er-Zr magnesium-lithium alloy: the method includes two stages of smelting and heat treatment.

[0031] Among them, the smelting process includes the following steps: melting each component of the alloy according to the ratio and then heating up to 690°C, mechanically stirring for 5 minutes, standing for 9 minutes for heat preservation, and then casting.

[0032] Heat treatment process: the as-cast...

Embodiment 3

[0035] This embodiment relates to a quasicrystal strengthened magnesium-lithium alloy containing Er. The Mg-Li-Zn-Er-Zr magnesium-lithium alloy contains the following components in mass percentage: Li 16%, Zn 4%, Er 4 %, Zr 0.6%, the total amount is less than 0.02wt.% by mass percentage of inevitable impurities such as Si, Fe, Cu and Ni, and the balance is Mg. Among them, the mass ratio of Er and Zn is 1:1, Zr is ZrCl 4 Mixed salt is 79% ZrCl 4 -9%LiCl-3%LiF-9%CaF 2 (mass percentage) added.

[0036] This embodiment also relates to a method for preparing the aforementioned Mg-Li-Zn-Er-Zr magnesium-lithium alloy: the method includes two stages of smelting and heat treatment.

[0037] Wherein, the smelting process includes the following steps: melting each component of the alloy according to the ratio and then raising the temperature to 660° C., mechanically stirring for 8 minutes, standing for 15 minutes for heat preservation, and then casting.

[0038] Heat treatment proces...

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Abstract

The invention discloses an Er-contained quasi-crystal reinforced magnesium-lithium alloy and a preparation method thereof. The magnesium-lithium alloy comprises, by weight, the following components: 10-16% of Li, 0.5-6% of Zn, 0.2-4% of Er, 0-0.6% of Zr and the balance being Mg and inevitable impurities. The preparation method of the quasi-crystal reinforced magnesium-lithium alloy comprises the following steps of two processes of smelting and heat treatment, wherein the smelting process comprises the following steps of: melting, stirring, standing and preserving heat and casting; and the heattreatment process comprises solution treatment and aging treatment. According to the invention, Zn and Er are introduced to form a quasi-crystalline phase, the mass ratio of Zn and Er is 1:1-8:1, thestrength and the thermal stability of the magnesium-lithium alloy can be obviously improved, and trace ZrCl4 mixed salt ZrCl4-LiCl-LiF-CaF2 is added into the alloy, so that the alpha-Mg grains are obviously refined.

Description

technical field [0001] The invention relates to a magnesium-lithium alloy in the field of metal structural materials and a preparation method thereof, in particular to an Er-containing quasicrystal strengthened magnesium-lithium alloy and a preparation method thereof. Background technique [0002] Due to the low density of Li (0.543g / cm 3 ), adding Li to the magnesium alloy can further reduce the weight of the alloy. As the metal structure material with the lowest density, magnesium-lithium alloy has broad application prospects in aerospace, military industry, 3C products and other fields. [0003] Magnesium-lithium alloys have the obvious advantages of light weight, but their low absolute strength and poor thermal stability limit their applications. In traditional magnesium alloys, the quasicrystalline phase is an effective strengthening phase. Y and Gd elements are added in traditional magnesium rare earth alloys and magnesium lithium alloys. However, there is no resea...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02C22F1/06
CPCC22C1/02C22C23/00C22F1/06
Inventor 冀浩刘文才吴国华彭翔欧阳思杰魏广玲
Owner SHANGHAI JIAO TONG UNIV
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