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Novel magnesium alloy composite material preparation method

A composite material and magnesium alloy technology, which is applied in the field of preparation of new magnesium alloy composite materials, can solve problems such as low hardness, poor toughness, and poor wear resistance, and achieve grain refinement, grain refinement, and shape reduction. The effect of the nuclear barrier

Inactive Publication Date: 2017-05-10
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned defects, the present invention designs a preparation method of a new type of magnesium alloy composite material. The invention mainly solves the problems of poor wear resistance, low hardness, and poor toughness of traditional magnesium alloys.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The chemical composition of the new magnesium alloy composite material is aluminum: 12.0%, zinc: 2.1%, manganese: 1.2%, neodymium: 0.5%, cerium: 0.5%, and the balance is magnesium. Nickel-coated nano-SiC particles with a diameter of 55 nm were added to the molten magnesium alloy material, the addition amount was 4.0 wt. %, the magnetic induction intensity of the electromagnetic field was 0.6 T, and the excitation current was 40 A. After casting, an electric field is applied to the ingot to refine the grains, the pouring temperature is 840 ℃, and the current density of the electric field is 1600 A / cm 2 , the frequency is 1200 Hz, and the pulse width is 45 μs. Then, the new magnesium alloy composite material is deformed by equal-path angular extrusion, and the inner angle of the equal-path angular extrusion die is Φ=120°.

[0021] The results show that compared with the magnesium alloy cast by the traditional method, the tensile strength of the new magnesium alloy compos...

Embodiment 2

[0023] The chemical composition of the new magnesium alloy composite material is aluminum: 13.0%, zinc: 2.4%, manganese: 1.5%, neodymium: 0.6%, cerium: 0.7%, and the balance is magnesium. Nickel-coated nano-SiC particles with a diameter of 60 nm were added to the molten magnesium alloy material, the addition amount was 4.5 wt.%, the magnetic induction intensity of the electromagnetic field was 0.7 T, and the excitation current was 43 A. After casting, an electric field is applied to the ingot to refine the grains, the pouring temperature is 870 ℃, and the current density of the electric field is 1800 A / cm 2 , the frequency is 1600 Hz, and the pulse width is 50 μs. Then, the new magnesium alloy composite material is subjected to equal-diameter angular extrusion deformation, and the inner angle of the equal-diameter angular extrusion die is Φ=130°.

[0024] The results show that compared with the magnesium alloy cast by the traditional method, the tensile strength of the new ma...

Embodiment 3

[0026] The chemical composition of the new magnesium alloy composite material is aluminum: 14.0%, zinc: 3.3%, manganese: 2.0%, neodymium: 0.7%, cerium: 0.7%, and the balance is magnesium. Nickel-coated nano-SiC particles with a diameter of 65 nm were added to the molten magnesium alloy material, the addition amount was 4.5 wt. %, the magnetic induction intensity of the electromagnetic field was 0.75 T, and the excitation current was 52 A. After casting, an electric field is applied to the ingot to refine the grains, the pouring temperature is 900 ℃, and the current density of the electric field is 2200 A / cm 2 , the frequency is 1300 Hz, and the pulse width is 64 μs. Then the new magnesium alloy composite material is subjected to equal-diameter angular extrusion, and the inner angle of the equal-diameter angular extrusion die is Φ=135°.

[0027] The results show that compared with the magnesium alloy cast by the traditional method, the tensile strength of the new magnesium all...

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Abstract

The invention relates to a novel magnesium alloy composite material preparation method. The novel magnesium alloy composite material preparation method is characterized in that a novel magnesium alloy composite material is prepared through the steps that aluminum, zinc, manganese, neodymium, cerium and magnesium are proportionally mixed, nickel coated nano-SiC particles are added into a magnesium alloy melt, an electromagnetic field is applied at the same time, the nickel coated nano-SiC particles are evenly scattered in the melt through electromagnetism simulated microgravity, an electric field is applied to a casting ingot after pouring to refine grains, and finally the novel magnesium alloy composite material is subject to equal channel angular pressing. The neodymium element in the novel magnesium alloy composite material has the dispersion strengthening effect, and formed metallic compounds can prevent grain boundary sliding; the cerium element can improve the alloy structure and refine the grains; a microgravity field enables the nickel coated nano-SiC particles to be evenly scattered in the melt; the electric field can increase the degree of supercooling of the melt, nucleation barriers are reduced, and the grains are refined; and the equal channel angular pressing can further refine the grains, and the synthetic mechanical property of the composite material is improved.

Description

technical field [0001] The invention belongs to the field of metal materials, in particular to a preparation method of a novel magnesium alloy composite material. Background technique [0002] Magnesium alloy has excellent properties such as high specific modulus and specific strength, shock absorption and easy forming and processing. It is widely used in automobiles, electronics, aerospace and other fields, and is a kind of engineering material with great potential. However, magnesium alloys have poor corrosion resistance and wear resistance and low hardness, which limits the scope of use of magnesium alloys. Therefore, the development of new magnesium alloy composite materials with strong corrosion resistance and wear resistance and high hardness has become an important development direction of magnesium alloys. [0003] Magnesium alloy composites are inseparable from stirring during the casting process. Traditional mechanical stirring not only makes it difficult to distri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C32/00C22C1/10C22C1/02
CPCC22C1/101C22C1/1036C22C23/02C22C32/0063C22C1/1047
Inventor 魏坤霞杨书戈魏伟耿桂宏杜庆柏胡静
Owner CHANGZHOU UNIV
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