Preparation method of a novel magnesium alloy composite material

A composite material and magnesium alloy technology, applied in the field of preparation of new magnesium alloy composite materials, can solve the problems of poor wear resistance, low hardness, poor strength and toughness, etc. The effect of crystallizing

Inactive Publication Date: 2018-05-01
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 designs a preparation method of a novel magnesium alloy composite material, which is characterized in that: the novel magnesium alloy composite material is mixed in proportion with aluminum, zinc, manganese, neodymium, cerium and magnesium, and nickel coating is added to the magnesium alloy melt Nano-SiC particles, while applying an electromagnetic field, electromagnetic simulation of microgravity to uniformly disperse nickel-coated nano-SiC particles in the melt, apply an electric field to the ingot after casting to refine the grains, and finally perform equal-diameter angular extrusion on the new magnesium alloy composite material compression deformation. The neodymium element in the new magnesium alloy composite material has a dispersion strengthening effect, and the formation of a metal compound can prevent grain boundary slippage; the cerium element can improve the alloy structure and refine the grain; the microgravity field makes the nickel-coated nano-SiC particles in the melt The dispersion is uniform; the electric field can increase the undercooling of the melt, reduce the nucleation barrier, and refine the grains; the equal-diameter angular extrusion deformation can further refine the grains and improve the comprehensive mechanical properties of the composite material.

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 Patents(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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