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Preparation method of graphene enhanced FCC-type high-entropy alloy

A high-entropy alloy and graphene technology, which is applied in the field of graphene-enhanced FCC high-entropy alloy preparation, can solve the problems of no obvious improvement in strength, decrease in material plasticity, and low carbon powder density, and achieve improved interface bonding performance, strong Good plastic matching, promoting uniform dispersion effect

Active Publication Date: 2020-08-14
西安稀有金属材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the common way to improve the strength of FCC (face-centered cubic lattice) high-entropy alloys is to add alloying elements, such as Al, Ti, Mo, etc. (Materials Herald, 2019, 33:1169-1173), but this method While increasing the strength, the material will become brittle and the plasticity of the material will be greatly reduced
Patents CN110004348A and CN110172629A both disclose the method of preparing high-entropy alloy powder by mechanical alloying high-energy ball milling, then adding graphene, and sintering to synthesize graphene-enhanced high-entropy alloy composite materials. However, due to long-term mechanical alloying, the ball milling process is seriously polluted , the strength has not been significantly improved and the plasticity of the material is poor; in addition, patents CN107675061A and CN110578104A prepare high-entropy alloy-based composite materials by adding carbon powder or ceramic particles during the smelting process. In the process, due to the low density of the carbon powder, the dispersion is uneven and it is easy to form M7C3 brittle hard carbides, which reduces the material performance. At the same time, what is added is not graphene in essence, which does not give full play to the characteristics that graphene should have.

Method used

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  • Preparation method of graphene enhanced FCC-type high-entropy alloy
  • Preparation method of graphene enhanced FCC-type high-entropy alloy
  • Preparation method of graphene enhanced FCC-type high-entropy alloy

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1. Raw material powder preparation: CoCrFeNiCu high-entropy alloy powder is prepared by gas atomization;

[0031] Step 2, short-time high-energy ball milling: 299.1 g of the CoCrFeNiCu high-entropy alloy powder with a particle size of 225 meshes prepared in step 1 was added to a planetary ball mill for ball milling, and then placed in a vacuum drying oven for drying; the ball milling process was carried out using The ball milling tank and balls are made of stainless steel, the diameters of the balls are 8mm, 5mm and 2mm and the mass ratio of the three kinds of balls is 3:2:1, the ratio of ball to material is 50:1, and the speed of ball milling is 450r / min, the time is 25min, and the process of stopping for 10min every 5min is alternately carried out, and 80mL ethanol is added as a process control agent during the ball milling process; the drying temperature is 80°C, the time is 15h, and the vacuum degree is -1...

Embodiment 2

[0047] This embodiment includes the following steps:

[0048] Step 1. Raw material powder preparation: CoCrFeNiCu high-entropy alloy powder is prepared by gas atomization;

[0049] Step 2, short-term high-energy ball milling: 49.95 g of the CoCrFeNiCu high-entropy alloy powder with a particle size of 120 meshes prepared in step 1 was added to a planetary ball mill for ball milling, and then placed in a vacuum drying oven for drying; the ball milling process was carried out using The ball milling tank and balls are made of stainless steel, the diameters of the balls are 8mm, 5mm and 2mm and the mass ratio of the three kinds of balls is 3:2:1, the ratio of ball to material is 15:1, and the speed of ball milling is 300r / min, the time is 5min, and the process of stopping for 10min every 5min is alternately carried out. During the ball milling process, ethanol is added as a process control agent; the drying temperature is 60°C, the time is 10h, and the vacuum degree is -1×10 -1 M...

Embodiment 3

[0053] This embodiment includes the following steps:

[0054] Step 1. Raw material powder preparation: CoCrFeNiCu high-entropy alloy powder is prepared by gas atomization;

[0055] Step 2, short-term high-energy ball milling: 99g of CoCrFeNiCu high-entropy alloy powder with a particle size of 200 meshes prepared in step 1 was added to a planetary ball mill for ball milling, and then placed in a vacuum drying oven for drying; the ball milling process used Both the ball milling tank and the balls are made of stainless steel, the diameters of the balls are 8mm, 5mm and 2mm and the mass ratio of the three kinds of balls is 3:2:1, the ratio of ball to material is 20:1, and the speed of ball milling is 350r / min , the time is 10min, and the process of stopping 10min for every 5min of ball milling is alternately carried out, and ethanol is added as a process control agent during the ball milling process; the drying temperature is 80°C, the time is 12h, and the vacuum degree is -1×10 ...

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Abstract

The invention discloses a preparation method of a graphene enhanced FCC-type high-entropy alloy. The method comprises the steps that 1, FCC-type high-entropy alloy powder is prepared by a gas atomization method; 2, the FCC-type high-entropy alloy powder is subjected to ball milling and then dried; 3, the dried FCC-type high-entropy alloy powder is mixed with graphene nanoflakes, then composite powder is obtained by ball milling; and 4, the composite powder is subjected to spark plasma sintering, and the graphene enhanced FCC-type high-entropy alloy is obtained after cooled in a furnace. According to the preparation method, short-time high-energy ball milling is adopted, so that the FCC-type high-entropy alloy powder forms multi-scale lamellar structures and produces fine nanocrystals, combined with low-energy ball milling, the graphene nanoflakes are completely and evenly dispersed between the lamellar structures, the graphene enhanced FCC-type high-entropy alloy with multi-scale crystals is prepared, the strengthening effect is effectively enhanced, and the good matching of strength and plasticity is achieved.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and in particular relates to a method for preparing graphene-reinforced FCC high-entropy alloys. Background technique [0002] High-entropy alloys have the characteristics of good strength, plasticity, corrosion resistance, high temperature softening resistance, low elastic modulus, soft magnetic properties and high resistivity, and are suitable for the manufacture of tools and molds with high requirements, refractory skeletons of super high buildings and High-frequency communicators, golf heads, etc. VNdMoTaW high-entropy alloys have better temperature-bearing capacity than traditional heat-resistant steels and nickel-based superalloys; CoCrFeNiCu high-entropy alloys have better corrosion resistance in NaCl solution than 304 stainless steel; FeCoNiCrMn exhibits excellent corrosion resistance at ultra-low temperatures. Low temperature performance, etc. It can be seen that...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/05C22C30/02C22C30/00B22F9/04B22F3/105B22F9/08
CPCB22F3/105B22F9/04B22F9/082B22F2009/043C22C1/05C22C30/00C22C30/02
Inventor 董龙龙夏洪勇刘跃张伟卢金文霍望图李亮张于胜周廉
Owner 西安稀有金属材料研究院有限公司
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