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CoCrNiCuFeMnAl high-entropy alloy and preparation method thereof

A high-entropy alloy and cobalt powder technology, which is applied in the field of metal alloy materials, can solve the problems of insufficient performance of mechanical properties and low density of high-entropy alloys, and achieve the effect of solving low density, increasing density, and reducing voids

Active Publication Date: 2020-08-11
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional hot-pressing sintering process, due to the finer high-entropy alloy powder adsorbing a large amount of impurities and the limited pressure of the hot-pressing equipment, the density of the sintered high-entropy alloy is low, and the mechanical properties cannot be fully expressed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A kind of preparation method of CoCrNiCuFeMnAl high entropy alloy, it comprises the following steps:

[0022] (1) Mill cobalt powder, chromium powder, nickel powder, copper powder, iron powder, manganese powder and aluminum powder in a ball mill for 20-30 hours; the mass ratio of the ball to the abrasive is 10:1-20 :1; steel balls with ball diameters of 1mm, 4mm, and 6mm are used for grinding balls, and the corresponding mass ratios are 1:3:6; the ball milling speed is 200-400r / min, forward and reverse alternately, and forward rotation for 1h , stop for 30 minutes, then reverse for 1 hour, and repeat; during the ball milling process, drop the process control agent every 10 hours to obtain high-entropy alloy powder;

[0023] (2) Fill the high-entropy alloy powder synthesized in step (1) into the mold, pre-press molding under the pressure of 200-500MPa, and the pre-pressing time is 30-300s; then the pre-pressed block is annealed, and the annealing temperature is 300~600℃...

Embodiment 1

[0029] According to mass percentage, iron powder 17.6wt.%, cobalt powder 18.5wt.%, nickel powder 18.5wt.%, chromium powder 16.4wt.%, copper powder 20.0wt.%, aluminum powder 8.5wt.% and manganese powder 0.5 wt.% was put into a WC cemented carbide tank, the purity of all metal powders was 99.5%, the mesh number was 200 mesh, the mass ratio of grinding balls and abrasives was 10:1, and the ball milling medium was WC cemented carbide balls. After repeated gas washing (argon gas) in the transition chamber of the glove box, put it into the operation chamber, cover the sealing cover, and ensure that the tank is taken out under the argon gas environment and put into the ball mill. The ball mill speed is 200r / min, and the forward and reverse runs alternately , rotate forward for 1 hour, stop for 30 minutes, then reverse for 1 hour, and repeat the cycle. When the ball milling time is 10 hours, add control agent industrial ethanol (analytical purity ≥ 99.7%), and the dropping amount is 0....

Embodiment 2

[0036] According to mass percentage, iron powder 17.6wt.%, cobalt powder 18.5wt.%, nickel powder 18.5wt.%, chromium powder 16.4wt.%, copper powder 20.0wt.%, aluminum powder 8.5wt.% and manganese powder 0.5 wt.% was put into a WC cemented carbide tank, the purity of all metal powders was 99.5%, the mesh number was 200 mesh, the mass ratio of grinding balls and abrasives was 20:1, and the ball milling medium was WC cemented carbide balls. After repeated gas washing (argon gas) in the transition chamber of the glove box, put it into the operation chamber, cover the sealing cover, and ensure that the tank is taken out under the argon gas environment and put into the ball mill. The ball mill speed is 300r / min, and the forward and reverse runs alternately , rotate forward for 1 hour, stop for 30 minutes, then reverse for 1 hour, and repeat the cycle. When the ball milling time is 10 hours, add control agent industrial ethanol (analytical purity ≥ 99.7%), and the dropping amount is 0....

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PUM

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Abstract

The invention belongs to the field of metal alloy materials, and relates to a CoCrNiCuFeMnAl high-entropy alloy. The CoCrNiCuFeMnAl high-entropy alloy comprises the following components of, in percentage by weight, 5.2-38.03 wt.% of cobalt powder, 4.5-34.53 wt.% of chromium powder, 5.17-37.92 wt.% of nickel powder, 5.68-40.25 wt.% of copper powder, 0.2-20.61 wt.% of iron powder, 0.5-33.45 wt.% ofmanganese powder and 0.3-20.03wt.% of aluminum powder. The preparation method comprises the steps that firstly, the metal simple substance powder is subjected to mechanical alloying in a ball mill, then the obtained high-entropy alloy powder is subjected to prepressing forming and annealing treatment and then subjected to hot pressing sintering, a sintered body is subjected to annealing treatment,finally the surface of the annealed sintered body is ground and polished, residual external impurities in the sample sintering process and burrs generated on the edge in the sintering process are removed, so that the CoCrNiCuFeMnAl high-entropy alloy block material is prepared. Compared with a traditional alloy, the high-entropy alloy has better density, hardness and compressive strength.

Description

technical field [0001] The invention relates to the field of metal alloy materials, in particular to a CoCrNiCuFeMnAl high-entropy alloy and a preparation method thereof. Background technique [0002] In 1995, Ye Junwei and others broke through the traditional concept of material design and proposed a new alloy design concept based on amorphous alloys, called multi-principal high-entropy alloys (High Entropy Alloys, HEAs). A high-entropy alloy is a kind of alloy with high mixing entropy that is composed of more than 5 kinds of elements alloyed according to the equiatomic ratio or near equiatomic ratio, and generally forms a solid solution. It was defined as a high-entropy alloy in 2004, and the atomic fraction of its main elements ranges from 5% to 35%. Due to the high entropy effect in thermodynamics, the lattice distortion effect in structure, the hysteresis diffusion effect in kinetics and the cocktail effect in performance, it is easy to obtain a solid solution phase wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/04C22F1/00
CPCC22C1/04C22C30/02C22F1/00
Inventor 罗永安李艳国邹芹罗文奇邹娟
Owner YANSHAN UNIV
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