High-entropy alloy with excellent strength and plasticity and preparation method thereof

A high-entropy alloy and plastic technology, applied in the field of high-entropy alloy and its preparation, can solve the problems of limited engineering application, limited strength improvement, low strength, etc., and achieve the effect of strength and plasticity improvement, good fracture strength and increased strength

Pending Publication Date: 2022-01-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Among the existing AlCoCrFeNi high-entropy alloy systems, the high-entropy alloy with a single FCC phase has good ductility and low strength, while the alloy with a single BCC phase has high yield strength but poor ductility, which limits its engineering. application
Through composition adjustment, the eutectic structure of FCC+BCC can be obtained under casting conditions, such as AlCoCrFeNi 2.1 ,, Al 19 Fe 20 co 20 Ni 41 and other alloys, the tensile strength and tensile plasticity have reached 1077MPa, 1103MPa and 16.8%, 18.7%, respectively, but the strength improvement is still limited

Method used

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  • High-entropy alloy with excellent strength and plasticity and preparation method thereof
  • High-entropy alloy with excellent strength and plasticity and preparation method thereof

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preparation example Construction

[0025] The preparation method of the above-mentioned high-entropy alloy with excellent strong plasticity includes:

[0026] Using pure Al, pure Co, pure Cr, pure Fe and pure Ni with a purity higher than 99.9% as raw materials, the constituent elements and atomic percentages are: 18-21% Al, 1-10% Co, 15-19% Cr, 20-24% Fe, 33-41% Ni in the high-entropy alloy proportion, and the above-mentioned high-entropy alloy is prepared by arc melting.

[0027] Wherein, the arc melting process is carried out in a non-consumable vacuum arc melting furnace. And the process conditions of the arc melting process are preferably: pre-evacuation 6 × 10 -3 Pa, backfill inert gas to -0.05MPa as a protective atmosphere; the inert gas is 99.999% high-purity argon.

[0028] Further, in order to ensure uniform composition, electromagnetic stirring is added during the arc melting process, and the magnetic stirring current is 2-20A, and the melting current is 100-400A.

[0029] Furthermore, in order to ...

Embodiment 1

[0032] The constituent elements and atomic percentages of the high-entropy alloy with excellent strong plasticity in this embodiment are: 19% Al, 1% Co, 19% Cr, 20% Fe, 41% Ni.

[0033] The preparation method of the alloy comprises the following steps:

[0034] Using pure Al, pure Co, pure Cr, pure Fe, and pure Ni with a purity higher than 99.9% as raw materials, the arc melting is carried out in a non-consumable vacuum arc melting furnace, and the pre-evacuation is 6×10 -3 Pa, backfilled with high-purity argon (99.999%) to -0.05MPa as a protective atmosphere;

[0035] The arc smelting is repeated 4 to 5 times, and the alloy ingot is turned over for the next smelting after each smelting, so as to improve the compositional uniformity of the final finished ingot.

[0036] Scanning electron microscopy characterizes the initial structure of the alloy prepared in this embodiment, and the results are as attached figure 1 As shown, its structure presents primary BCC phase and inter...

Embodiment 2

[0038] The constituent elements and atomic percentages of the high-entropy alloy with excellent strong plasticity in this embodiment are: 19% Al, 5% Co, 18% Cr, 20% Fe, 38% Ni.

[0039] The preparation method of the alloy comprises the following steps:

[0040] Using pure Al, pure Co, pure Cr, pure Fe, and pure Ni with a purity higher than 99.9% as raw materials, the arc melting is carried out in a non-consumable vacuum arc melting furnace, and the pre-evacuation is 6×10 -3 Pa, backfilled with high-purity argon (99.999%) to -0.05MPa as a protective atmosphere;

[0041] The arc smelting is repeated 4 to 5 times, and the alloy ingot is turned over for the next smelting after each smelting, so as to improve the compositional uniformity of the final finished ingot.

[0042]Cut the obtained alloy ingot into parallel sections of 8*2*1.5mm 3 The plate tensile specimen, the tensile rate is 1*10 -3 / s for tensile performance test, the results show that its tensile strength is 1259MP...

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Abstract

The invention discloses a high-entropy alloy with excellent strength and plasticity and a preparation method thereof, and the high-entropy alloy comprises the following components in percentage by atom: 18 to 21% of Al, 1 to 10% of Co, 15 to 19% of Cr, 20 to 24% of Fe and 33 to 41% of Ni. The preparation of the high-entropy alloy is completed by adopting an electric arc melting method. In the alloy provided by the invention, a primary BCC phase dendritic crystal and an intergranular eutectic structure are generated. The BCC phase is high in strength but low in plasticity, the intercrystalline eutectic structure has high strength and plasticity, due to the eutectic structure, the primary BCC phase can be cooperatively deformed through back stress strengthening, the strength is remarkably improved, and good plasticity is guaranteed. The high-entropy alloy with excellent strength and plasticity provided by the invention has excellent breaking strength and good percentage elongation after fracture. For the optimal component proportion, the tensile strength can reach 1290 MPa, the percentage elongation after fracture is 17.6%, and compared with an existing AlCoCrFeNi series high-entropy alloy, the strength and plasticity are remarkably improved under the same electric arc melting process condition.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloy materials, and in particular relates to a high-entropy alloy with excellent strong plasticity and a preparation method thereof. Background technique [0002] High-entropy alloys are metal materials that have emerged in recent years and have wide application potential. It alloys five or more elements in an equiatomic ratio or near equiatomic ratio, which breaks the traditional design concept of single principal element composition of alloys. , displaying a different arrangement of atomic structures than conventional alloys. The high mixing entropy makes the alloy show simple solid solution structures such as face-centered cubic, body-centered cubic, and hexagonal close-packed after solidification. The unique phase and atomic structure make high-entropy alloys exhibit excellent performance under low temperature, high temperature, irradiation and corrosion conditions, and have broad engin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02
Inventor 王军李洪超李金山寇宏超王毅袁睿豪唐斌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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