High-entropy alloy refiner for refining industrial pure aluminum or aluminum alloy and refining method thereof

A high-entropy alloy, industrial pure aluminum technology, applied in the field of metallurgical materials, can solve the problems of reducing the plasticity, low strength, and easy deformation of aluminum alloys, and achieve the effects of improving the shape, improving the uniformity, and reducing the size

Inactive Publication Date: 2019-07-19
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aluminum is a common light metal, which is abundant in the earth's crust. It is widely used for its light weight, good electrical and thermal conductivity, and oxidation resistance, but its application is limited due to its low strength and easy deformation.
The tensile and yield strength of aluminum alloy can be improved by alloying, but the plasticity of aluminum alloy is reduced

Method used

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  • High-entropy alloy refiner for refining industrial pure aluminum or aluminum alloy and refining method thereof
  • High-entropy alloy refiner for refining industrial pure aluminum or aluminum alloy and refining method thereof
  • High-entropy alloy refiner for refining industrial pure aluminum or aluminum alloy and refining method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] According to the elemental composition and molar ratio of the high-entropy alloy refiner to be prepared, mix the metal elements with a purity greater than 99.9%, put them into a vacuum electric arc furnace, and melt them with a current of 200A under the protection of high-purity argon. 2.0min to 3.0min until it is completely melted, and repeated smelting for 5 to 6 times to ensure that its composition is uniform, and about 40g of button-shaped high-entropy alloy refiner is obtained. Among them, the relationship between each high-entropy alloy refiner and the metal element ingredients is shown in Table 1 below:

[0038] Table 1

[0039]

[0040]

Embodiment 2

[0042] (1) Heat pure aluminum at 810°C in a Si-C rod crucible furnace until it is completely melted into molten metal, wrap a small piece of high-entropy alloy refiner 1 with aluminum foil, and press it into the molten metal at a temperature of 810°C In the process, the high-entropy alloy refining agent 1 is added in an amount of 0.1% of the total melt mass, kept at 810°C for 1 hour, and mechanically stirred once every 10 minutes during the process;

[0043] (2) Cover the solid hexachloroethane refining agent with aluminum foil and press it into the heat-preserved molten metal. The amount of hexachloroethane refining agent added is 0.8% of the weight of the molten metal. Rapidly stir and refine to remove impurities in the melt and gas, after removing the slag, cast it at about 720°C to obtain a refined pure aluminum casting 1.

Embodiment 3

[0045] (1) Heat pure aluminum at 790°C in a Si-C rod crucible furnace until it is completely melted into molten metal, wrap a small piece of high-entropy alloy refiner 1 with aluminum foil, and press it into the molten metal at a temperature of 790°C In the process, the high-entropy alloy refining agent 1 is added in an amount of 0.5% of the total melt mass, kept at 790°C for 1 hour, and mechanically stirred once every 10 minutes during the process;

[0046] (2) Cover the solid hexachloroethane refining agent with aluminum foil and press it into the heat-preserved molten metal. The amount of hexachloroethane refining agent added is 0.8% of the weight of the molten metal. Rapidly stir and refine to remove impurities in the melt and gas, after removing the slag, cast it at about 700°C to obtain a refined pure aluminum casting 2.

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Abstract

The invention discloses a high-entropy alloy refiner for refining industrial pure aluminum or aluminum alloy and a refining method thereof. The high-entropy alloy refiner is at least one of AlCoCrFeNiTi, AlFeMgTiZn, AlCoCuNiZn and AlSiTiCrNiCu. The method comprises the steps of pressing a small block of the high-entropy alloy refiner after being coated by aluminum foil into pure aluminum metal liquid or aluminum alloy metal liquid with the temperature of 790 DEG C-810 DEG C, keeping the temperature of 790 DEG C-810 DEG C for one hour, and mechanical stirring rapidly one time every 10 minutes in the process; and after a solid hexachloroethane refining agent is coated with the aluminum foil, pressing the coated solid hexachloroethane refining agent into the insulated metal liquid, rapidly stirring, refining, removing impurities and gases in the melt, deslagging, pouring and forming around the temperature of 720 DEG C to prepare refined industrial pure aluminum or aluminum alloy castings.According to the method, the pure aluminum or aluminum alloy castings with fine macroscopic and microscopic grain sizes can be obtained after being subjected to the high-entropy alloy refining, moreover, the secondary phase structure of the aluminum alloy can be effectively refined, and the uniformity of distribution of the secondary phase on a matrix is improved, and therefore the mechanical properties of the aluminum or aluminum alloy castings are remarkably improved.

Description

technical field [0001] The invention belongs to the field of metallurgical materials, and in particular relates to the application of a high-entropy alloy refiner, the refinement of industrial pure aluminum or aluminum alloy and a refinement method. Background technique [0002] Aluminum is a common light metal, which is abundant in the earth's crust. It is widely used for its light weight, good electrical and thermal conductivity, and oxidation resistance, but its application is limited due to its low strength and easy deformation. . The tensile and yield strength of aluminum alloy can be improved by alloying, but the plasticity of aluminum alloy is reduced. Grain refinement of aluminum or aluminum alloys increases strength while improving ductility. Adding a grain refiner (chemical refinement) is the easiest and most economical way to refine the grains of industrially pure aluminum or aluminum alloys. Fine grains can be dispersed in more grains when subjected to plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/06C22C1/03C22C21/02C22C21/06C22C21/10C22C21/12
CPCC22C1/026C22C1/03C22C1/06C22C21/02C22C21/06C22C21/10C22C21/12
Inventor 李庆林赵尚兰晔峰马吉强张雨时包雪鹏马晓东
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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