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Magnesium alloy with high strength, super toughness and low density and preparation method thereof

A magnesium alloy and low-density technology, applied in the field of high-strength, ultra-high toughness, low-density, and ultra-light magnesium alloys, can solve the problems of poor strength, poor toughness, and low plasticity of magnesium alloys

Inactive Publication Date: 2012-03-07
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low plasticity and poor toughness of existing magnesium alloy materials and poor strength of magnesium alloys added with lithium elements, the purpose of the present invention is to provide a magnesium alloy, which not only has high strength, but also has high plasticity and low density At 1.7g / cm 3 Magnesium alloy, which can meet the requirements of strength and plastic performance indicators for room temperature deformation processing of thin plate materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of: Li: 8%, Zn: 5%, Y: 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 with argon gas for 10 minutes, 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 the condition of argon protection, and then the magnesium alloy ingot is extruded at 300° C. to form a material.

[0017] Tensile performance tests were carried out...

Embodiment 2

[0019] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of: Li: 8.5%, Zn: 4%, Y: 4.5%, Nd: 1%, and the impurity elements Fe<0.005%, Cu< 0.002%, Ni<0.002%, and 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 with argon gas for 5 minutes, and poured into a water-cooled copper mold at 740° C. to obtain a cast magnesium alloy ingot. The obtained cast magnesium alloy ingot is heat-treated at 355° C. under argon protection, and then extruded at 150° C. to form a 2 mm plate.

[0020] Tensile performance tests were carried out on a room temperature electronic universal tes...

Embodiment 3

[0022] The high-strength, super-tough, low-density ultra-light magnesium alloy of the present invention is composed of: Li: 6.5%, Zn: 2%, Y: 5%, 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 cast magnesium alloy ingot is heat-treated at 400° C. under the protection of argon, and then extruded at 200° C. to form a plate of 1 mm.

[0023] Tensile performance tests were carried out on a room temperature electronic universal testing machine and a temperature-controlled electronic universal testing machine. The obtained magnesium alloy has tensile strength: 261MPa, yield strength: 224MPa, elongation: 24%, density: 1.59g / cm at room temperature 3 ; At 120°C, tensile strength: 198MPa, yield strength: 157MPa, elongation: 36%.

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Abstract

The invention discloses a super-light magnetism alloy with high strength, super toughness and low density, which comprises the following components in percentage by weight: 5-12% of Li, 1-5% of Zn, 1-6% of Y, 0-2% of Re and the balance Mg. The invention adopts an argon protection method to cast alloy after evacuation, then heat treatment is carried out on obtained as-cast magnetism alloy ingot under the condition of gas protection, and then the alloy is extruded or processed by rolling warm deformation so as to obtain the magnetism alloy after deformation processing. The invention provides a magnetism alloy the density of which is less than 1.7g / cm<3>, which has high strength and high plasticity and toughness, and can satisfy the index requirements on strength and plasticity of deformation processing sheet materials at room temperature.

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 high-strength, ultra-high toughness, low-density, and ultra-light magnesium alloy. Background technique [0002] Magnesium alloy has significant advantages such as low specific gravity, high specific strength and specific stiffness, and the most effective shielding of radio waves. It has become the material of choice for modern automobiles, portable electronic products, electronics, communications and other industries. Although magnesium alloys have many advantages, traditional magnesium alloys still have problems such as low strength, poor toughness, difficult plastic processing, and poor creep resistance at high temperatures, which limit their application as some structural parts. Magnesium alloys still cannot satisfy plastic forming such as room temperature or medium temperature extrusion, stamping, forging, rolling, etc. like ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06
Inventor 徐春杰孟令楠张忠明
Owner XIAN UNIV OF TECH
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