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Low rare earth high strength magnesium lithium alloy and preparation method thereof

A magnesium-lithium alloy, high-strength technology, applied in the field of low-rare-earth magnesium-lithium alloys and alloys, can solve problems such as poor strength of magnesium-lithium alloy materials

Inactive Publication Date: 2010-07-28
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor strength of existing magnesium-lithium alloy materials, the object of the present invention is to provide a low-rare-earth high-strength magnesium-lithium alloy with a density lower than 1.6g / cm 3 , the magnesium alloy not only has high strength, but also a magnesium-lithium alloy with high plastic deformation ability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The high-strength, super-tough and low-density ultra-light magnesium alloy of the present invention is composed of: Li: 7%, Zn: 4%, Ca: 2%, controlled impurity elements Fe<0.005%, Cu<0.002%, Ni< 0.002%, the rest is Mg. Alloy melting takes place in a vacuum resistance furnace. First, the surface of each metal ingot is decontaminated and placed in a crucible, then the vacuum resistance furnace is evacuated and filled with argon gas, repeated 3 times, and finally filled with argon gas to 1 atm, and the heating and melting process is carried out under the protection of argon gas. The metal melt is stirred for 10 minutes by introducing argon gas into a pure titanium tube, and poured into a water-cooled copper mold at 720° C. to obtain a cast magnesium alloy ingot. The obtained cast magnesium alloy ingot is subjected to heat treatment at 300° C. under argon protection condition, and then the magnesium alloy ingot is extruded at 260° C. to form a material. Tensile performanc...

Embodiment 2

[0018] The high-strength, super-tough and low-density ultra-light magnesium alloy of the present invention is composed of: Li: 8.2%, Zn: 5%, Ca: 3%, Nd: 1%, and control impurity elements Fe < 0.005%, Cu < 0.002%, Ni<0.002%, and the rest is Mg. The conditions for obtaining cast magnesium alloy ingots by melting and casting are the same as in Example 1. The obtained as-cast magnesium alloy ingot is heat-treated at 310° C. under argon protection, and then extruded at 255° C. to form a 2 mm plate. Tensile performance tests were carried out on a room temperature electronic universal testing machine and a temperature-controlled electronic universal testing machine.

[0019] The obtained magnesium alloy has tensile strength: 247MPa, yield strength: 221MPa, elongation: 23%, density: 1.52g / cm at room temperature 3 ; At 120°C, tensile strength: 198MPa, yield strength: 161MPa, elongation: 33%.

Embodiment 3

[0021] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of Li: 6.8%, Zn: 2%, Ca: 4.5%, Y: 1%, controlled impurity elements Fe < 0.005%, Cu < 0.002%, Ni<0.002%, and the rest is Mg. The conditions for obtaining cast magnesium alloy ingots by melting and casting are the same as in Example 1. The obtained cast magnesium alloy ingot is heat-treated at 300° C. under argon protection, and then extruded at 265° C. to form a plate of 1 mm. Tensile performance tests were carried out on a room temperature electronic universal testing machine and a temperature-controlled electronic universal testing machine.

[0022] The obtained magnesium alloy has tensile strength: 252MPa, yield strength: 219MPa, elongation: 23%, density: 1.53g / cm at room temperature 3 ; Under the condition of 120 ℃, the tensile strength: 189MPa, yield strength: 159MPa, elongation: 34%.

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Abstract

The invention discloses a low rare earth magnesium lithium alloy, composed of the following components by weight percent: 5.5-11% of Li, 1-5% of Zn, 1-5% of Ca, 0-2% of RE, balance Mg. Vacuum-pumping and argon protection method is adopted to cast alloy, then the obtained as cast magnesium alloy ingot is subject to heat treatment under the protection of gas, and finally the alloy is extruded or rolled and subject to texturing processing, thus obtaining magnesium alloy after texturing processing. The invention provides a magnesium lithium alloy with low rare earth content and density less than 1.6g / cm3; the magnesium lithium alloy not only has high strength but also has higher plasticity and toughness and can meet the requirement of room temperature texturing processing thin plate on performance indexes of strength and plasticity.

Description

technical field [0001] The invention belongs to the technical field of metal materials and metallurgy, and relates to an alloy, in particular to a low-rare-earth magnesium-lithium alloy. Background technique [0002] Magnesium alloy has low specific gravity, high specific strength and specific stiffness. Magnesium-lithium alloy is a new type of ultra-light alloy with good plastic deformation ability developed in recent years. The strengthening effect of deformation hardening is very limited, and the strength of the lithium-rich β phase is extremely low. Therefore, the strength at room temperature is extremely low, and the tensile strength of magnesium-lithium alloys is generally lower than 100 MPa, which greatly limits the wide application of such alloys. How to ensure that the alloy has both good plasticity and high strength after the matrix crystal structure transforms into a mixed structure of lithium-rich β phase and magnesium-rich α phase is the main technical problem ...

Claims

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Application Information

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IPC IPC(8): C22C23/00B22D21/04C22F1/06
Inventor 徐春杰孟令楠张忠明
Owner XIAN UNIV OF TECH
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