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A method for improving the surface properties of single-phase high-entropy alloys

A high-entropy alloy and surface performance technology, applied in the field of surface engineering, can solve problems such as reducing surface roughness and refinement, and achieve the effects of saving process time and improving wear resistance

Active Publication Date: 2021-02-09
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above problems, the invention provides a method for improving the surface properties of single-phase high-entropy alloys, the specific scheme is to have the as-cast Al with single-phase face-centered cubic (FCC) lattice structure x The CrCoFeMnNi high-entropy alloy sample is machined on the surface, and then the surface of the high-entropy alloy sample is strengthened by ultrasonic impact technology, so that a certain depth of plastic deformation layer is formed on the surface of the high-entropy alloy to reduce its surface roughness and achieve surface finishing. processing; and can significantly refine the grains, produce a large number of microscopic defects such as dislocations and twins, and improve the surface hardness of the high-entropy alloy on the premise of ensuring the toughness of the core of the high-entropy alloy, thereby improving its wear resistance

Method used

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  • A method for improving the surface properties of single-phase high-entropy alloys

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Embodiment 1

[0041] A method for improving the surface performance of a single-phase high-entropy alloy, the specific process steps are as follows:

[0042] (1) Taking the as-cast CrCoFeMnNi (x=0) high-entropy alloy with a single-phase face-centered cubic lattice structure as the object;

[0043] (2) processing the surface of the cast high-entropy alloy sample in step (1) into a plane;

[0044] (3) Then use sandpaper to carry out rust removal treatment on the surface of the sample, and then wipe the surface to be treated with acetone to remove oil stains;

[0045] (4) Fix the flat sample under the ultrasonic shock working head;

[0046] (5) Use a spherical ultrasonic impact working head with a radius of 5mm to process the surface of the flat sample. Specific parameters: step distance: 0.05mm, cutting speed: 300mm / min, working air pressure: 0.2MPa, amplitude: 12μm, frequency: 30KHz, current: 1.18A, resonance voltage: 13.26V, static pressure 0.3MPa.

[0047] (6) Ultrasonic impact treatmen...

Embodiment 2

[0054] A method for improving the surface performance of a single-phase high-entropy alloy, the specific process steps are as follows:

[0055] (1) As-cast Al with a single-phase face-centered cubic lattice structure 0.5 CrCoFeMnNi (x=0.5) high-entropy alloy is the object;

[0056] (2) processing the surface of the cast high-entropy alloy sample in step (1) into a plane;

[0057] (3) Then use sandpaper to carry out rust removal treatment on the surface of the sample, and then wipe the surface to be treated with acetone to remove oil stains;

[0058] (4) Fix the flat sample under the ultrasonic shock working head;

[0059] (5) Use a spherical ultrasonic impact working head with a radius of 5mm to process the surface of the flat sample. Specific parameters: step distance: 0.05mm, cutting speed: 350mm / min, working air pressure: 0.2MPa, amplitude: 14μm, frequency: 30KHz, current: 1.18A, resonance voltage: 13.26V, static pressure 0.3MPa.

[0060] (6) Cast Al 0.5 CrCoFeMnNi hig...

Embodiment 3

[0067] A method for improving the surface performance of a single-phase high-entropy alloy, the specific process steps are as follows:

[0068] (1) As-cast Al with a single-phase face-centered cubic lattice structure 0.5 CrCoFeMnNi (x=0.5) high-entropy alloy is the object;

[0069] (2) processing the surface of the cast high-entropy alloy sample in step (1) into a plane;

[0070] (3) Then use sandpaper to carry out rust removal treatment on the surface of the sample, and then wipe the surface to be treated with acetone to remove oil stains;

[0071] (4) Fix the flat sample under the ultrasonic shock working head;

[0072] (5) Use a spherical ultrasonic impact working head with a radius of 5mm to process the surface of the flat sample. Specific parameters: step distance: 0.05mm, cutting speed: 360mm / min, working air pressure: 0.2MPa, amplitude: 13μm, frequency: 30KHz, current: 1.18A, resonance voltage: 13.26V, static pressure 0.3MPa.

[0073] (6)Al 0.5 CrCoFeMnNi high-entr...

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Abstract

The invention discloses a method for improving the surface performance of a single-phase high-entropy alloy, which belongs to the technical field of high-entropy alloy surface strengthening, wherein the single-phase high-entropy alloy is Al x CrCoFeMnNi alloy, where x represents the number of moles, and x=0-0.5. After the single-phase high-entropy alloy has undergone solid solution treatment and surface pretreatment, the surface of the high-entropy alloy is strengthened by ultrasonic impact equipment. The high-entropy alloy has a single-phase face-centered cubic structure. After ultrasonic impact, a plastic deformation layer with a certain depth is formed on the surface of the high-entropy alloy. The crystal grains are obviously refined, and a gradient structure is formed from the surface to the core, and the hardness and wear resistance are significantly improved. The invention can obtain fine structures and a large number of microscopic defects on the surface of the high-entropy alloy while keeping the chemical composition of the surface unchanged and the toughness of the core, so that the surface hardness is increased by 1.8-2.5 times, and the wear resistance is increased by 1.3-2.5 times , the method is simple, easy to operate, safe and reliable, low energy consumption, economical and practical.

Description

technical field [0001] The invention belongs to the field of surface engineering, and in particular relates to a method for improving the surface properties of single-phase high-entropy alloys, which is suitable for surface strengthening treatment of high-entropy alloys with high requirements on hardness, wear resistance and corrosion resistance. Background technique [0002] Traditional alloy materials are almost always based on one metal element, and specific alloy elements are added to obtain alloys with high strength, toughness, corrosion resistance, and wear resistance. Multi-principal element high-entropy alloy breaks the traditional thinking of alloy design. It is composed of at least five elements as the principal element, and the atomic fraction of each principal element is between 5% and 35%. leading to show excellent performance and potential application prospects. [0003] At present, the vacuum arc melting method is the most commonly used preparation method for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/00C21D10/00
CPCC21D10/00C22F1/00
Inventor 李美艳韩彬王稼林张琪张世一李建龙
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)