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High-nitrogen high-entropy alloy and preparation method thereof

A high-entropy alloy and high-nitrogen technology, applied in the field of alloys, can solve the problems of high economic cost, high cost and restricting industrial production of high-entropy alloys.

Active Publication Date: 2021-03-30
SHENYANG AEROSPACE UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the reason for the significant increase in the yield strength of the above-mentioned alloys is the addition of titanium or molybdenum, and the atomic content of nickel is as high as 33%. The cost of these three raw materials is very high, which directly leads to very high economic costs of high-entropy alloys. industrial production

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  • High-nitrogen high-entropy alloy and preparation method thereof
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  • High-nitrogen high-entropy alloy and preparation method thereof

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preparation example Construction

[0040] The present invention also provides a preparation method for the high-nitrogen high-entropy alloy described in the above technical solution, comprising the following steps:

[0041] Provide liquid alloy water;

[0042] The liquid alloy water is sequentially subjected to casting, hot forging, hot rolling, solid solution, cold rolling and quenching to obtain the high nitrogen and high entropy alloy.

[0043] In the present invention, the method for preparing liquid alloy water preferably includes the following steps: melting alloy raw materials of corresponding components to obtain liquid alloy water. In the present invention, the composition of the alloy raw material is the same as that of the aforementioned high-nitrogen high-entropy alloy, and will not be repeated here. In the present invention, there is no special limitation on the type of the alloy raw material, and the high-strength, high-plasticity and wear-resistant high-entropy alloy of the target composition ca...

Embodiment 1

[0055] In terms of mole percentage, the high-nitrogen high-entropy alloy includes Fe 47.0%, Co 10.0%, Mn 30.0%, Cr 10.0% and N 3.0%.

[0056] The preparation method of the high-nitrogen high-entropy alloy is:

[0057] The Fe block with a purity of 99.9wt%, the Co block with a purity of 99.9wt%, the Mn block with a purity of 99.9wt%, the Cr block with a purity of 99.9wt%, and the nitrogen content of 99.9wt% with a nitrogen content of 14.5wt% The manganese nitride alloy is melted in a pressurized vacuum intermediate frequency induction furnace, the melting vacuum is 4Pa, the melting temperature is 1700°C, the melting time is 18min, and the melting is repeated 5 times to obtain liquid alloy water;

[0058] The obtained liquid alloy water is cast into a cylindrical ingot at 1700°C, and the obtained ingot is hot-calcined at 1200°C for 10 minutes, so that the cylindrical ingot becomes a cuboid primary alloy billet with a rectangular cross section (105mm×50mm), The obtained primary ...

Embodiment 2

[0069] In terms of mole percentage, the high-nitrogen high-entropy alloy includes Fe 47.0%, Co 10.0%, Mn 30.0%, Cr 10.0% and N 3.0%.

[0070] The preparation method of the high-nitrogen high-entropy alloy is:

[0071] The Fe block with a purity of 99.9wt%, the Co block with a purity of 99.9wt%, the Mn block with a purity of 99.9wt%, the Cr block with a purity of 99.9wt%, and the nitrogen content of 99.9wt% with a nitrogen content of 14.5wt% The manganese nitride alloy is melted in a pressurized vacuum intermediate frequency induction furnace, the melting vacuum is 4Pa, the melting temperature is 1700°C, the melting time is 18min, and the melting is repeated 5 times to obtain liquid alloy water;

[0072] The obtained liquid alloy water is cast into a cylindrical ingot at 1700°C, and the obtained ingot is hot-calcined at 1200°C for 10 minutes, so that the cylindrical ingot becomes a cuboid primary alloy billet with a rectangular cross section (105mm×50mm), The obtained primary ...

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Abstract

The invention belongs to the technical field of alloys, and particularly relates to a high-nitrogen high-entropy alloy and a preparation method thereof. The high-nitrogen high-entropy alloy is prepared from, in mole percentage, the following elements of 46.0-48.0% of Fe, 9.0-11.0% of Co, 29.0-31.0% of Mn, 9.0-11.0% of Cr and 2.0-4.0% of N. Through the synergistic effect of all the elements, the high-nitrogen high-entropy alloy is of a mixed structure of austenite and nanoscale precipitated phases in a room-temperature environment; when a stress load is borne, dislocation slippage and mechanical twinning occur, and the alloy has extremely high yield strength and good plasticity; and experimental results show that the high-nitrogen high-entropy alloy has the yield strength of 1,337MPa, the elongation of 20% and the tensile strength of 1,375MPa at room temperature.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a high-nitrogen high-entropy alloy and a preparation method thereof. Background technique [0002] Traditional alloys are mainly based on one alloying element, and the microstructure and properties of the alloy are regulated by adding a variety of alloying elements; while high-entropy alloys are solid solution alloys formed by five or more nearly equimolar alloying elements, which have high Mixing entropy, difficulty in atomic diffusion, and high lattice distortion make it easier to obtain solid solutions and nanostructures with high thermal stability, and even amorphous structures, showing high hardness, high strength, high temperature oxidation resistance, wear resistance, Excellent properties such as corrosion resistance have great application potential. Cantor alloys with specific atomic ratios of iron, cobalt, manganese, chromium and nickel are the earliest auste...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/10C22C1/03C22F1/00
CPCC22C30/00C22C1/1036C22F1/002C22C1/1047
Inventor 朱明伟贾楠何竹风王洪伟闫海乐申勇峰
Owner SHENYANG AEROSPACE UNIVERSITY
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