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A kind of high-strength high-entropy alloy and its preparation method

A high-entropy alloy and high-strength technology, applied in the field of alloys, can solve problems such as low strength, high production cost, and high plasticity

Active Publication Date: 2021-11-09
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is still a problem that solid solutions with a single face-centered cubic crystal structure tend to have high plasticity and extremely low strength.
Literature "Ultrahigh cryogenic strength and exceptional ductility in ultrafine-grained CoCrFeMnNihigh-entropy alloy with fully recrystallized structure" (Sun S J, TianYZ, AnX H, Lin H R, Wang JW, Zhang Z F.[J]. Materials TodayNano, 2018, 4: 46. ) reported that by adopting the process of cold rolling combined with annealing (at 675 ° C for 30 min), a completely recrystallized ultra-fine grain structure was introduced into the single-phase iron-cobalt-manganese-chromium-nickel high-entropy alloy alloy, which made it cool at room temperature The yield strength reaches 780MPa, the tensile strength reaches 870MPa, and the uniform elongation is 38%, but the high-entropy alloy in this document contains 20% atomic percentage of Ni element, which makes its production cost still high

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  • A kind of high-strength high-entropy alloy and its preparation method
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  • A kind of high-strength high-entropy alloy and its preparation method

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preparation example Construction

[0041] The present invention also provides a method for preparing the high-strength high-entropy alloy described in the above technical solution, comprising the following steps:

[0042] Provide liquid alloy water;

[0043] The liquid alloy water is sequentially subjected to casting, hot forging, hot rolling, solid solution, cold rolling and quenching to obtain the high-strength and high-entropy alloy.

[0044] 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 consistent with the composition of the aforementioned high-strength 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-entropy alloy with the target composition can be obtained by usin...

Embodiment 1

[0057] In terms of mole percentage, the high-strength high-entropy alloy includes 50.0% Fe, 10.0% Co, 30.0% Mn and 10.0% Cr.

[0058] The preparation method of described high-strength high-entropy alloy is:

[0059] Melting Fe blocks with a purity of 99.9wt%, Co blocks with a purity of 99.9wt%, Mn blocks with a purity of 99.9wt%, and Cr blocks with a purity of 99.9wt% were melted in a vacuum induction furnace at a melting temperature of 1800°C. The single melting time is 18 minutes, and the melting is repeated 5 times to obtain liquid alloy water;

[0060] The obtained liquid alloy water is cast into a cylindrical ingot at 1800°C, and the obtained ingot is hot-calcined at 1200°C for 10 minutes, so that the cylindrical ingot becomes a rectangular parallelepiped primary alloy billet with a square cross section (80mm×80mm), The obtained primary alloy billet is hot-rolled at 900°C, the number of hot-rolling passes is 5 times, the rolling deformation of each pass is 10%, and the t...

Embodiment 2

[0074] In terms of mole percentage, the high-strength high-entropy alloy includes 50.0% Fe, 10.0% Co, 30.0% Mn and 10.0% Cr.

[0075] The preparation method of described high-strength high-entropy alloy is:

[0076] Melting Fe blocks with a purity of 99.9wt%, Co blocks with a purity of 99.9wt%, Mn blocks with a purity of 99.9wt%, and Cr blocks with a purity of 99.9wt% were melted in a vacuum induction furnace at a melting temperature of 1800°C. The single melting time is 18 minutes, and the melting is repeated 5 times to obtain liquid alloy water;

[0077] The obtained liquid alloy water is cast into a cylindrical ingot at 1800°C, and the obtained ingot is hot-calcined at 1200°C for 10 minutes, so that the cylindrical ingot becomes a rectangular parallelepiped primary alloy billet with a square cross section (80mm×80mm), The obtained primary alloy billet is hot-rolled at 900°C, the number of hot-rolling passes is 5 times, the rolling deformation of each pass is 10%, and the t...

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Abstract

The invention belongs to the technical field of alloys, and in particular relates to a high-strength high-entropy alloy and a preparation method thereof. The invention provides a high-strength high-entropy alloy, which comprises the following components in terms of mole percentage: Fe 49.0-51.0%, Co 9.0-11.0%, Mn 29.0-31.0% and Cr 9.0-11.0%. The high-strength high-entropy alloy provided by the present invention is a dual phase of austenite and martensite at room temperature, and there are a large number of submicron scale precipitates; The phase boundary strengthening jointly contributes to the improvement of the strength of the high-strength high-entropy alloy material, so that the provided high-strength high-entropy alloy has extremely high yield strength and good plasticity. Experimental results show that the yield strength of the high-strength high-entropy alloy provided by the present invention reaches 880 MPa, the elongation rate reaches 45.66%, and the tensile strength reaches 950 MPa at room temperature.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a high-strength 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, difficult atomic diffusion and high lattice distortion can easily obtain solid solutions and nanostructures with high thermal stability, and even amorphous structures, showing high hardness, high strength, high temperature oxidation resistance, and wear resistance. , corrosion resistance and other excellent properties, has great application potential. Therefore, high-entropy alloys have become high-performance metallic materials with important application potential....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/30C22C38/38C22C30/00C21D8/00C21D1/18
CPCC21D1/18C21D8/005C21D2211/001C21D2211/008C22C30/00C22C38/30C22C38/38
Inventor 贾楠王洪伟何竹风闫海乐申勇峰
Owner NORTHEASTERN UNIV LIAONING