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Rare earth magnesium-lithium alloy sheet and preparation method thereof

A technology of lithium alloy and rare earth magnesium, which is applied in the field of rare earth magnesium lithium alloy plate and its preparation, can solve the problems that restrict the application and promotion of magnesium alloy, the strength has not been significantly improved, and the alloy density has been increased, so as to shorten the solidification time and inhibit the crystal grain The effect of growing up and improving strength

Inactive Publication Date: 2013-09-11
INNER MONGOLIA 52 SPECIAL MATERIAL ENG TECH RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, magnesium alloy materials have low mechanical properties and poor plasticity, which seriously restricts the application and promotion of magnesium alloys, especially wrought magnesium alloy materials. At present, research work on improving the strength and plasticity of magnesium alloys has been widely carried out at home and abroad. The country's research on high-strength and superplastic magnesium alloy materials is in a leading position. The new magnesium alloy materials developed have high mechanical properties and good plasticity. Among them, lithium is added to improve the plasticity of magnesium alloys. Adding rare earth elements to refine the grains and improve the comprehensive mechanical properties of magnesium alloys has achieved some experimental results, but it is still not ideal. D.K.Xu et al. (D.K.Xu, L.Liu, Y.B.Xu, Scripta Materialia.285.57 (2007) ), adding Zn and Y to the magnesium-lithium alloy strengthens the alloy, and obtains an alloy with higher strength and better plasticity. However, since the amount of Zn added is above 3wt%, it not only increases the density of the alloy, but also prone to aging problems
R.Z.Wu et al. (R.Z.Wu, Z.K.Qu, M.Zhang, Materials Science and Engineering A 516(2009)96-99) inhibited the The formation of α phase spheroidizes the crystal structure and enhances the plasticity of the alloy, but the strength does not improve significantly

Method used

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  • Rare earth magnesium-lithium alloy sheet and preparation method thereof
  • Rare earth magnesium-lithium alloy sheet and preparation method thereof
  • Rare earth magnesium-lithium alloy sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The composition of a kind of magnesium-lithium alloy plate is by weight percentage:

[0029] Li: 11%, Y: 1%, Gd: 1%, Sc: 0.3%, Al: 9%, and the rest is magnesium.

[0030] A method for preparing the magnesium-lithium alloy plate is as follows:

[0031] (1) Preparation: Mg-Li or Al-Li, Mg-Y, Mg-Gd, Mg-Sc or Al-Sc master alloy, pure aluminum, pure magnesium;

[0032] Lithium element is added in the form of magnesium-lithium master alloy or aluminum-lithium master alloy, and its alloy composition is as follows: the lithium content of magnesium-lithium alloy is between 10% and 20 wt%, and the lithium content of aluminum-lithium alloy is between 20 and 40 wt%. The content of yttrium in the master alloy of magnesium and yttrium is greater than or equal to 20 wt%, the content of gadolinium in the master alloy of magnesium and gadolinium is greater than or equal to 20 wt%, and the content of scandium in the master alloy of magnesium and scandium or aluminum and scandium is grea...

Embodiment 2

[0052] The composition of the magnesium alloy plate is by weight percentage:

[0053] Li: 13%, Y: 1.5%, Gd: 1%, Sc: 0.5%, Al: 9%, and the rest is magnesium.

[0054] The preparation method of the present invention is:

[0055] (1) Preparation: Mg-Li or Al-Li, Mg-Y, Mg-Gd, Mg-Sc or Al-Sc master alloy, pure aluminum, pure magnesium;

[0056] Lithium element is added in the form of magnesium-lithium master alloy or aluminum-lithium master alloy, and its alloy composition is as follows: the lithium content of magnesium-lithium alloy is between 10% and 20 wt%, and the lithium content of aluminum-lithium alloy is between 20 and 40 wt%. ; The content of yttrium in the master alloy of magnesium and yttrium is greater than or equal to 20 wt%, the content of gadolinium in the master alloy of magnesium and gadolinium is greater than or equal to 20 wt%, and the content of scandium in the master alloy of magnesium and scandium or aluminum and scandium is greater than or equal to 5 wt%;

...

Embodiment 3

[0077] The composition of the magnesium alloy plate is by weight percentage:

[0078] Li: 15%, Y: 1%, Gd: 1.5%, Sc: 0.8%, Al: 9%, and the rest is magnesium.

[0079] The preparation method of the present invention is:

[0080] (1) Preparation: Mg-Li or Al-Li, Mg-Y, Mg-Gd, Mg-Sc or Al-Sc master alloy, pure aluminum, pure magnesium;

[0081] Lithium element is added in the form of magnesium-lithium master alloy or aluminum-lithium master alloy, and its alloy composition is as follows: the lithium content of magnesium-lithium alloy is between 10% and 20 wt%, and the lithium content of aluminum-lithium alloy is between 20 and 40 wt%. ; The content of yttrium in the master alloy of magnesium and yttrium is greater than or equal to 20 wt%, the content of gadolinium in the master alloy of magnesium and gadolinium is greater than or equal to 20 wt%, and the content of scandium in the master alloy of magnesium and scandium or aluminum and scandium is greater than or equal to 5 wt%; th...

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Abstract

The invention discloses a rare earth magnesium-lithium alloy sheet and a preparation method thereof, belonging to the field of metal processing. The rare earth magnesium-lithium alloy sheet is characterized by comprising the following components in percentage by weight: 11-15% of Li, 0.5-2% of Y, 0.5-2% of Gd, 0.1-1% of Sc, 7-9% of Al and the balance of magnesium. The preparation method comprises the following steps of: melting magnesium and intermediate alloy by using an industrial medium-frequency or line-frequency induction melting furnace, adjusting the furnace temperature for heat preservation treatment, sampling from the furnace and carrying out rapid on-the-spot sample analysis after the heat preservation time is reached, and detecting whether the components are qualified; and hot rolling and cold rolling a pouring and rolling sheet, carrying out T6 treatment, then, making a mechanical sample, and measuring the mechanical property. By using the rare earth magnesium-lithium alloy sheet and the preparation method thereof, the strength of magnesium-lithium alloy is ensured, the plastic deformation capability of the magnesium-lithium alloy is also greatly enhanced, the production difficulty of the deformed magnesium-lithium alloy sheet is lowered, and the production efficiency is increased. The alloy smelting process is simple, convenient and reliable, convenient to operate and free of special processing process and alloy adding methods. A cast ingot is fine and uniform in tissue, free of meshy and thick sheet-like Mg17Al12 phase and uniform in precipitated phase. The rolling process is simple, convenient, reliable and feasible, and the sheet has favorable comprehensive mechanical property.

Description

technical field [0001] The invention relates to a rare earth magnesium-lithium alloy plate and a preparation method thereof, belonging to the field of metal processing. technical background [0002] Magnesium alloy material is currently the lightest metal material in the application of structural metal materials. It has small specific gravity, high specific strength, high specific stiffness, good electrical and thermal conductivity, good noise reduction and electromagnetic shielding, good cutting performance, and easy recycling. It is widely used in aviation, aerospace, automobile manufacturing, home appliances, and electronic information products, and has become the most promising metal material in the 21st century. However, magnesium alloy materials have low mechanical properties and poor plasticity, which seriously restricts the application and promotion of magnesium alloys, especially wrought magnesium alloy materials. At present, research work on improving the strength ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06C21D8/02
Inventor 高平邸建辉付利涛李淑利张明寇江民袁媛杨春霞
Owner INNER MONGOLIA 52 SPECIAL MATERIAL ENG TECH RES CENT
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