High-strength magnesium-lithium alloy

A magnesium-lithium alloy, high-strength technology, applied in the field of alloys, can solve the problems of decreased corrosion resistance of the alloy, unfavorable thermal stability of the alloy, and increased cost of the alloy, and achieves the effect of improving strength, high strength, and reducing lithium content

Inactive Publication Date: 2008-11-05
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alloys involved in this comparative document have higher strength and lower density, but to prepare a β-phase single-phase alloy, its lithium content is generally above 11wt%, which will inevitably cause an increase in the cost of the alloy and cause the alloy to be damaged. The corrosion resistance drops sharply, and it also has an adverse effect on the thermal stability of the alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0014] The composition and weight percentage of the magnesium-lithium alloy are: Li: 5%, Al: 3%, Zn: 1%, Ce: 1%, and the balance is Mg. The smelting is carried out in a vacuum induction furnace. Before the smelting starts, the atmosphere in the furnace is evacuated to a vacuum state below 1.0Pa, and then argon is filled into the furnace to start heating (so that the alloy is in an argon atmosphere during the smelting process) . The smelted melt is poured into a metal mold to obtain the cast alloy. The obtained as-cast alloy is subjected to homogenization treatment under the condition of 350±10° C. / 24 h, and then the alloy after homogenization treatment is peeled and subjected to deformation processing (extrusion or / and rolling). The alloy after deformation processing is tested for mechanical properties with an electronic universal mechanical testing machine, and the density of the sample is tested with the Archimedes method.

[0015] The tensile strength of the obtained magn...

Embodiment approach 2

[0017] The composition and weight percentage of the magnesium-lithium alloy are: Li: 6%, Al: 5%, Zn: 1.5%, Ce: 0.7%, and the balance is Mg. The smelting is carried out in a vacuum induction furnace. Before the smelting starts, the atmosphere in the furnace is evacuated to a vacuum state below 1.0Pa, and then argon is filled into the furnace to start heating (so that the alloy is in an argon atmosphere during the smelting process) . The smelted melt is poured into a metal mold to obtain the cast alloy. The obtained as-cast alloy is subjected to homogenization treatment under the condition of 350±10° C. / 24 h, and then the alloy after homogenization treatment is peeled and subjected to deformation processing (extrusion or / and rolling). The alloy after deformation processing is tested for mechanical properties with an electronic universal mechanical testing machine, and the density of the sample is tested with the Archimedes method.

[0018] The tensile strength of the obtained ...

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Abstract

The invention provides a high-strength magnesium-lithium alloy. The weight percent composition is: Li: 4-7%, Al: 2-7%, Zn: 0.5-2%, Ce: 0.1-1.5%, and the balance is Mg. The advantages of the high-strength magnesium-lithium alloy involved in the present invention are: on the basis of maintaining low density, the lithium content is reduced, and the strength of the alloy is improved at the same time. Therefore, the cost of alloy preparation can be reduced, and the strength of the magnesium-lithium alloy can be improved. In addition, due to the reduction of lithium content, the corrosion resistance and thermal stability of the magnesium-lithium alloy can also be improved.

Description

(1) Technical field [0001] The invention relates to an alloy, specifically a magnesium-lithium alloy. (2) Background technology [0002] The density of lithium is 0.53g / cm 3 , which is only one-third of that of magnesium, adding lithium to magnesium alloys will greatly reduce the density of magnesium alloys. In addition, lithium has a cubic lattice structure, and the addition of lithium can reduce the axial ratio (c / a value) of the magnesium lattice (hexagonal close-packed) and even make the alloy change from cubic lattice β phase (Li solid solution with Mg element in solid solution) Composition, thereby improving the plasticity of magnesium alloys. [0003] Based on the above advantages, magnesium-lithium alloys have attracted a lot of attention from material researchers. At present, there are mainly three grades of magnesium-lithium alloys that have been industrially used in the world (MA21, MA18 and LA141A). Low is also an important issue that people pay attention to....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00
Inventor 张密林巫瑞智王涛刘滨牛中毅
Owner HARBIN ENG UNIV
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