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High-entropy alloy reinforced magnesium-based composite material and preparation method thereof

A high-entropy alloy and composite material technology is applied in the field of high-entropy alloy reinforced magnesium-based composite materials and their preparation, and can solve the problems of poor creep resistance, insufficient strength and hardness, and too fast deformation rate. , to achieve the effect of good industrialization prospects, high hardness and low cost

Inactive Publication Date: 2020-02-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the field of magnesium-based composite materials currently being studied, there are few types of matrix alloys. For example, although the commonly used AZ91D magnesium alloy has good tensile strength and die-casting performance, its creep resistance is not very good; the creep resistance of AS41B magnesium alloy Good, but the strength and hardness are not high enough to meet the needs of improving the overall performance of magnesium-based composite materials. At present, the high-strength wrought magnesium alloys that have been industrialized are mainly Mg-Al series. Due to the high Al content, such alloys There are a large number of magnesium-aluminum phases, and these second phases have a lower melting point, and the second phase is easily dissolved during high-speed extrusion, resulting in cracking of the profile
It has the disadvantage that the deformation rate cannot be too fast

Method used

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  • High-entropy alloy reinforced magnesium-based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0038] The preparation method of the magnesium-based composite material reinforced by the above-mentioned high-entropy alloy comprises the following steps:

[0039] (1) Preparation of high-entropy alloy ingot:

[0040] The high-entropy alloy element FeCoCrNiMn to be prepared was weighed according to the equiatomic ratio, placed in a water-cooled copper mold fixed in a vacuum electric arc furnace, smelted in a vacuum environment, and protected by argon. Repeated smelting for 5 times to prevent composition segregation, and obtain a high-entropy alloy ingot with uniform composition;

[0041] The purity of each raw material is not less than 99.5wt.%. When placed in a water-cooled copper crucible, each raw material is placed from bottom to top according to its melting point from low to high;

[0042] (2) Preparation of high entropy alloy powder:

[0043] Firstly, the high-entropy alloy ingot is milled into shavings, and then the metal shavings are put into a ball mill with argon ...

Embodiment example 2

[0054] (1) Preparation of high-entropy alloy ingots:

[0055] Weigh the corresponding mass of the high-entropy alloy element FeCoCrNiCu to be prepared according to the equiatomic ratio, place it in a water-cooled copper mold fixed in a vacuum electric arc furnace, melt it in a vacuum environment, and pass it into argon for protection, repeatedly Smelting more than 5 times to prevent composition segregation and obtain a high-entropy alloy ingot with uniform composition

[0056] The purity of each raw material is not less than 99.5wt.%. When placed in a water-cooled copper crucible, each raw material is placed from bottom to top according to its melting point from low to high;

[0057] (2) Preparation of high-entropy alloy powder:

[0058] Firstly, the high-entropy alloy ingot is milled into shavings, and then the metal shavings are put into a ball mill with argon gas in a vacuum and ball milled to a particle size of 30 μm to prepare high-entropy alloy powder particles; the bal...

Embodiment example 3

[0069] (1) Destined steps for preparing high-entropy alloys:

[0070] Weigh the corresponding mass of the FeCoCrNiAl high-entropy alloy elements to be prepared according to the equiatomic ratio, place them in a water-cooled copper mold fixed in a vacuum electric arc furnace, melt in a vacuum environment, and pass in argon gas for protection and repeated melting Prevent composition segregation for more than 5 times, and obtain high-entropy alloy ingot with uniform composition

[0071] The purity of each raw material is not less than 99.5wt.%. When placed in a water-cooled copper crucible, each raw material is placed from bottom to top according to its melting point from low to high;

[0072] (2) Preparation of high-entropy alloy powder:

[0073] Firstly, the high-entropy alloy ingot is milled into shavings, and then the metal shavings are put into a ball mill with argon gas in a vacuum and ball milled to a particle size of 30 μm to prepare high-entropy alloy powder particles; ...

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Abstract

The invention discloses a high-entropy alloy reinforced magnesium-based composite material and a preparation method thereof. A high-entropy alloy is used as a reinforced phase of the composite material; and a magnesium alloy is used as a matrix of the composite material. The preparation method comprises the following steps of: firstly preparing a high-entropy alloy ingot; then preparing high-entropy alloy powder; preparing composite powder by using the high-entropy alloy powder and magnesium alloy powder; and finally performing sintering molding, hot extrusion molding and extrusion molding. The high-entropy alloy powder and the magnesium alloy matrix in the interface of the composite material have relatively good wettability, and are beneficial to the uniform diffusion of the high-entropyalloy in the magnesium alloy; a physical bonding type interface can be formed; the bonding strength of the interface is high; the interface state is good; and the problem that the generation of an effective interface between an existing magnesium alloy composite material and a reinforced body is difficult is solved.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and more specifically relates to a high-entropy alloy-reinforced magnesium-based composite material and a preparation method thereof. Background technique [0002] Magnesium-based composites have low density, high specific stiffness and specific strength, and also have good high temperature resistance, wear resistance, impact resistance, excellent shock absorption performance and good dimensional stability. In addition, it also has the characteristics of electromagnetic shielding and hydrogen storage. It is an excellent structural and functional material, and it is also one of the composite materials expected to be used in today's high-tech fields. The preparation methods include casting metallurgy, powder metallurgy, spray deposition, in-situ synthesis, etc. The commonly used reinforcement phases mainly include fiber reinforcement, whisker reinforcement and particle reinforcement. A...

Claims

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Application Information

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IPC IPC(8): C22C1/04C22C23/00
CPCC22C1/0408C22C23/00
Inventor 胡绳荪崔妍申俊琦
Owner TIANJIN UNIV
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