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Rare earth yttrium doped magnesium-lithium alloy and preparation method thereof

A magnesium-lithium alloy and yttrium-doped technology, which is applied in the field of alloy smelting, can solve problems such as imperfect smelting process, poor high-temperature mechanical properties, and poor corrosion resistance, and achieve the effects of simple smelting equipment, reduced combustion, and convenient operation

Pending Publication Date: 2020-05-22
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems of low absolute strength and poor high-temperature mechanical properties of Mg-Li alloys, the present invention uses thermodynamic calculation software and phase diagrams to design alloy components, determine the additions of Li, Al, and Y elements in Mg alloys, and prepare Mg-Li alloys. -Al-Y series alloys to solve a series of problems existing in the existing Mg-Li series alloys such as imperfect smelting process, low strength, poor corrosion resistance, and poor high-temperature mechanical properties

Method used

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  • Rare earth yttrium doped magnesium-lithium alloy and preparation method thereof
  • Rare earth yttrium doped magnesium-lithium alloy and preparation method thereof
  • Rare earth yttrium doped magnesium-lithium alloy and preparation method thereof

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Embodiment 1

[0058] A Mg-4Li-1Al-0.5Y alloy ingot, the mass percentage of each component is: Li 4.0%, Al 1%, Y0.5%, the balance is Mg and impurities; wherein the total content of the impurities is low at 0.02wt.%.

[0059] And the preparation method of the Mg-4Li-1Al-0.5Y alloy ingot is as follows:

[0060] Weigh magnesium ingots, aluminum ingots, Mg-30Y master alloys and lithium ingots according to the composition ratio of the Mg-4Li-1Al-0.5Y alloy. After melting, stir mechanically for 10 minutes, raise the temperature to 710°C and keep it warm for 20 minutes, and pour to obtain magnesium-lithium alloy ingots. The magnesium-lithium alloy ingot was kept at 350°C for 2 hours, extruded at an extrusion ratio of 13:1, and annealed at 350°C for 1 hour to obtain a magnesium-lithium alloy doped with rare earth yttrium. On the annealed alloy, according to the national standard, the mechanical properties of the alloy at room temperature were tested by processing the tensile sample.

[0061] The ...

Embodiment 2

[0064] A Mg-3.9Li-0.8Al-0.2Y alloy ingot, the mass percent of each component is: Li 3.9%, Al 0.8%, Y 0.2%, and the balance is Mg and impurities; wherein the total of the impurities The content is less than 0.02wt.%.

[0065] And the preparation method of the Mg-3.9Li-0.8Al-0.2Y alloy ingot is as follows:

[0066] Weigh the magnesium ingot, aluminum ingot, Mg-30Y master alloy and lithium ingot according to the composition ratio of Mg-3.9Li-0.8Al-0.2Y alloy, and place the raw materials of each composition ratio in the crucible under solvent and protective gas , after melting, stir mechanically for 10 minutes, raise the temperature to 710°C and keep it warm for 20 minutes, and cast the magnesium-lithium alloy ingot. The magnesium-lithium alloy ingot was kept at 350°C for 2 hours, extruded at an extrusion ratio of 13:1, and annealed at 350°C for 1 hour to obtain a magnesium-lithium alloy doped with rare earth yttrium. On the annealed alloy, according to the national standard, th...

Embodiment 3

[0070] A Mg-4.2Li-1Al-1Y alloy ingot, the mass percentage of each component is: Li 4.2%, Al 0.8%, Y1%, the balance is Mg and impurities; wherein the total content of the impurities is less than 0.02 wt.%.

[0071] And the preparation method of the Mg-4.2Li-1Al-1Y alloy ingot is as follows:

[0072] Weigh magnesium ingots, aluminum ingots, Mg-30Y master alloys and lithium ingots according to the composition ratio of the Mg-4.2Li-1Al-1Y alloy, and place the raw materials of each composition ratio in a solvent and protective gas in a crucible. After melting, stir mechanically for 10 minutes, raise the temperature to 710°C and keep it warm for 20 minutes, and pour to obtain magnesium-lithium alloy ingots. The magnesium-lithium alloy ingot was kept at 350°C for 2 hours, extruded at an extrusion ratio of 13:1, and annealed at 350°C for 1 hour to obtain a magnesium-lithium alloy doped with rare earth yttrium. On the annealed alloy, according to the national standard, the mechanical...

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Abstract

The invention discloses a rare earth yttrium doped magnesium-lithium alloy and a preparation method thereof, and belongs to the technical field of alloy smelting. The rare earth yttrium doped magnesium-lithium alloy is mainly composed of, by mass percent, 3.8%-4.2% of Li, 0.5%-1.0% of Al, 0.2%-1.0% of Y and the balance Mg and impurities. According to the rare earth yttrium doped magnesium-lithiumalloy and the preparation method thereof, the relation between the chemical ingredients, structure and performance of the prepared Mg-Al-Y alloy is studied, and the strengthening and toughening mechanism of the alloy is disclosed. By means of changing the crystal structure of the alloy, refining grains, generating high-melting-point hard phases and the like, the strength of an Mg-Li alloy is improved on the premise of guaranteeing the plasticity, and certain reference bases are provided for actual application of the Mg-Li-Al alloy.

Description

technical field [0001] The invention relates to the technical field of alloy smelting, in particular to a magnesium-lithium alloy doped with rare earth yttrium and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, higher requirements are constantly put forward for the performance of metal materials. In the field of aviation, aerospace and consumer electronics, the development of traditional alloy systems such as aluminum alloys has been very mature and perfect, and the potential space for further performance improvement is limited. In particular, the density and specific strength of aluminum alloys are inferior to Mg-Li alloys. The performance requirements of some specific structures cannot be met. As the lightest structural material, magnesium-lithium alloy has attracted extensive attention in the electronics, automotive and aerospace industries due to its low density, good processability, high specific streng...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03C22C1/06C22F1/06
CPCC22C1/03C22C1/06C22C23/00C22F1/008C22F1/06
Inventor 王金辉张梦娜张磊朱云鹏
Owner QINGHAI UNIVERSITY
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