Nanocrystalline high-entropy alloy powder and preparation method thereof

A technology of high-entropy alloys and nanocrystals, applied in the field of powder metallurgy, can solve the problems of high energy consumption and large investment in equipment, and achieve the effects of simple equipment, improved powder activity, and accelerated solid-state diffusion

Inactive Publication Date: 2019-12-17
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Simplify the existing cumbersome process of preparing high-entropy alloy powders and adopt simple and feasible alternative methods; overcome the bottleneck in large-scale industrial production and use, and produce high-entropy alloy powd

Method used

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  • Nanocrystalline high-entropy alloy powder and preparation method thereof
  • Nanocrystalline high-entropy alloy powder and preparation method thereof
  • Nanocrystalline high-entropy alloy powder and preparation method thereof

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preparation example Construction

[0029] The invention discloses a preparation method of nanocrystalline high-entropy alloy powder, such as figure 1 As shown, the method comprises the steps of:

[0030] 100. Place the mixture of cobalt powder, chromium powder, iron powder, nickel powder, manganese powder, aluminum powder and titanium powder in a vacuum drying oven to dry;

[0031] 200. The dried mixture is packed into a ball mill jar in a glove box full of argon;

[0032] 300. Fill the ball mill tank with inert gas, first mix powder at low speed, and then perform high-energy ball milling at high speed;

[0033] 400. After the high-energy ball milling is completed, open the ball milling tank in the glove box, and then transfer the alloy powder to the transition chamber. After vacuuming, fill it with air and let it stand. Repeat several times to slowly passivate the alloy powder in the air. After passivation, the prepared nanocrystalline high-entropy alloy powder is taken out.

[0034] Among them, the mass ra...

Embodiment 1

[0035] Embodiment 1: Preparation of CoCrFeNi high-entropy alloy powder:

[0036] According to the above implementation steps, in a glove box filled with argon, put cobalt powder, chromium powder, iron powder, and nickel powder in an equiatomic ratio together in a ball milling tank, fill the ball milling tank with argon gas, and put it on a planetary ball mill According to the following ball milling parameters, high-energy ball milling is carried out: stainless steel is used for ball milling, the ball diameter is 16mm, and the mass ratio of ball to material is 5:1. Firstly, the metal powder is mixed at a low speed of 200rpm for 6 hours to mix the metal powders evenly, and then high-speed 300rpm high-energy ball milling is carried out. 84h. After the high-energy ball milling is completed, the ball milling tank is opened in a glove box filled with argon, and the obtained nanocrystalline CoCrFeNi high-entropy alloy powder is taken out after the transition chamber is passivated.

...

Embodiment 2

[0038] Example 2: Al 0.3 CoCrFeNi High Entropy Alloy

[0039] According to the above implementation steps, in a glove box filled with argon, put aluminum powder, cobalt powder, chromium powder, iron powder, and nickel powder into the ball mill tank together, the aluminum powder accounts for 7 at.%, and other metals account for 23.25 at. %. Fill the ball mill tank with argon gas, and perform high-energy ball milling on the planetary ball mill according to the following ball mill parameters: stainless steel is used for the ball mill, the diameter of the ball is 16mm, the mass ratio of the ball to material is 5:1, and the powder is mixed at a low speed of 200rpm for 6 hours Mix the metal powders uniformly, and then perform high-speed 300rpm high-energy ball milling for 60h. After the high-energy ball milling is completed, open the ball milling tank in a glove box filled with argon, and take out the prepared nanocrystalline Al after the passivation of the transition chamber. 0....

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Abstract

The invention discloses nanocrystalline high-entropy alloy powder and a preparation method thereof, and relates to the technical field of powder metallurgy. The invention involves the nanocrystallinehigh-entropy alloy powder and the preparation method of the nanocrystalline high-entropy alloy powder, wherein the nanocrystalline high-entropy alloy powder comprises cobalt powder, chromium powder, iron powder, nickel powder, manganese powder, aluminum powder and titanium powder; and the metal element powder is directly mixed through a high-energy mechanical ball milling method by the preparationmethod of the nanocrystalline high-entropy alloy powder, and the nanocrystalline high-entropy alloy powder is prepared according to the specific steps. According to the nanocrystalline high-entropy alloy powder and the preparation method, through high-speed impact and grinding of grinding medium, reaction activation energy is reduced, powder activity is improved, solid diffusion among element powder is promoted, low-temperature chemical reaction is induced, and finally, the alloy powder with uniform composition and structure distribution is obtained, so that the problems of element volatilization and non-uniform components of the powdering after smelting is conducted are solved. The technical is simple in equipment, the procedure is simplified compared with a traditional method, the manufacturing cost is reduced, and the nanocrystalline high-entropy alloy powder powder the preparation method thereof are suitable for industrial large-scale preparation.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and relates to a nanocrystalline high-entropy alloy powder and a preparation method thereof, in particular to a method of mixing cobalt powder, chromium powder, iron powder, nickel powder, manganese powder, aluminum powder and titanium powder. Preparation of high-entropy alloy powder by mechanical ball milling and its preparation method. Background technique [0002] Traditional metal alloys generally refer to one or two metal elements as the matrix, with a small amount of other metal or non-metal elements to adjust the metal properties of the material. However, this traditional design concept also prevents major breakthroughs in metal materials. In recent years, the proposal of high entropy alloys applies the concept of high entropy mixture to alloy design, bringing the development of metal materials into a new era. High entropy alloy is a kind of disordered solid solution alloy disc...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22C30/00C22C1/00
CPCB22F9/04B22F2009/041C22C1/00C22C30/00C22C2200/04
Inventor 王俊张震梁加淼谢跃煌鞠江
Owner SHANGHAI JIAO TONG UNIV
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