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Sn-containing fine-grained magnesium-lithium tin alloy

A magnesium-lithium alloy and tin alloy technology is applied in the field of new magnesium alloy materials, which can solve the problems of poor plasticity and over-aging of the alloy, and achieve the effects of low production cost, increased strength and plasticity, and avoiding the problem of over-aging.

Inactive Publication Date: 2011-04-27
CHONGQING ACADEMY OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Q. Xiang et al. studied Mg-5Li-3Al-2Zn-(0.5-2.0)Sn (Journal of Alloys and Compounds 477 (2009) 832-835), but the basic structure of the alloy is hexagonal close-packed, containing more Al and Zn elements belong to multi-element alloying, resulting in poor plasticity of the alloy
At the same time, there are a large number of MgLi2Al compounds in the alloy, and there is a significant overaging phenomenon

Method used

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  • Sn-containing fine-grained magnesium-lithium tin alloy
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Using the following formula (mass percentage): Mg: 82.20%; Li: 14.0%; Sn: 3.5%; the total of Mn, Fe, Si, Ni, Cu and Na is less than 0.30%, and the melting is carried out in a vacuum induction melting furnace. The two components are put into the stainless steel crucible together according to the corresponding addition amount. Before smelting, first pump the furnace to a vacuum state, then introduce argon gas, and then start smelting. After the alloy is completely melted, keep it warm for 20 minutes, then cut off the power of the induction melting furnace, and take out the crucible after the alloy is completely solidified. , to obtain cast alloys. It should be pointed out that the whole melting process is under the protection of argon.

[0021] The grain size of the obtained magnesium-lithium alloy was measured by the intercept method, and the average grain size was 700??m. The novel magnesium lithium tin alloy that adopts this method to make, its as-cast g...

Embodiment 2

[0022] Example 2: Adopt the following formula (mass percentage): Mg: 86.70%; Li: 12.0%; Sn: 1.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%. The components are put into the stainless steel crucible together according to the corresponding addition amount. Before smelting, evacuate the furnace to a vacuum state, then introduce argon gas, and then start smelting. After the alloy is completely melted, keep it for 20 minutes to make the added raw materials fully alloyed, and then cut off the power supply of the induction melting furnace until The alloy is completely solidified, and the crucible is taken out to obtain the cast alloy. It should be pointed out that the whole melting process is under the protection of argon.

[0023] The grain size of the obtained magnesium-lithium alloy was measured by the intercept method, and the average grain size was 750??m.

Embodiment 3

[0024] Example 3: Adopt the following formula (mass percentage): Mg: 86.70%; Li: 10.0%; Sn: 3.0%; Mn, Fe, Si, Ni, Cu, Na are less than 0.30%. The components are put into the stainless steel crucible together according to the corresponding addition amount. Before smelting, first pump the furnace to a vacuum state, then introduce argon gas, and then start smelting. After the alloy is completely melted, keep it warm for 20 minutes, then cut off the power of the induction melting furnace, and take out the crucible after the alloy is completely solidified. , to obtain cast alloys. It should be pointed out that the whole melting process is under the protection of argon.

[0025] The grain size of the obtained magnesium-lithium alloy was measured by the intercept method, and the average grain size was 800??m.

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Abstract

The invention provides a Sn-containing fine-grained magnesium-lithium tin alloy, which consists of the following components in percentage by mass: 10 to 15 percent of Li, 1.0 to 5.0 percent of Sn, less than or equal to 0.30 percent of unavoidable impurity elements and the balance of Mg. A preparation method comprises the following steps of: adding the Sn into a magnesium-lithium alloy, smelting in a vacuum induction smelting furnace, and preserving heat and standing for 20 minutes after the alloy is completely smelted; and completely solidifying the alloy to obtain an as-cast magnesium-lithium tin alloy, wherein the whole smelting process is performed under the protection of argon gas. After the Sn is added, the microstructure of a magnesium-lithium tin alloy ingot is fine and uniform, strength and plasticity are increased, subsequent processability is high, production cost is low, and the alloy is suitable for large-scale industrial production; meanwhile, the problem of overaging of an aluminum-containing magnesium-lithium alloy is solved.

Description

technical field [0001] The invention relates to a novel magnesium alloy material, in particular to a Sn-containing magnesium-lithium alloy with fine crystal grains and a preparation method thereof. [0002] Background technique [0003] With the enhancement of energy consumption reduction and environmental protection requirements of transportation vehicles, as well as the development of electronic industry and aerospace technology, it is urgent to develop low-density, high-strength metal structural materials. Mg-Li alloy is currently the lightest metal structural material and one of the most potential alloy systems for the development of ultra-light and high-strength alloys. It has become the focus of research at home and abroad in recent years. Mg-Li alloy not only has high specific strength, high impact toughness, good machinability, but also has good magnetic shielding, shock absorption performance and high-energy particle penetration resistance, so it has received exte...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02
Inventor 潘复生蒋斌彭建李红成
Owner CHONGQING ACADEMY OF SCI & TECH
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