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Method for improving surface performance of single-phase high-entropy alloy

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: 2018-12-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • 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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  • Method for improving surface performance of single-phase high-entropy alloy

Examples

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Effect test

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 surface performance of a single-phase high-entropy alloy, and belongs to the technical field of high-entropy alloy surface strengthening. The single-phase high-entropy alloy is an Al<x>CrCoFeMnNi alloy, wherein x represents the mole number, and is equal to 0-0.5; after the single-phase high-entropy alloy is subjected to solution treatment and surfacepretreatment, the surface of the high-entropy alloy is strengthened through ultrasonic impact equipment; and the high-entropy alloy is of a single-phase face-centered cubic structure, a certain depthof plastic deformation layer is formed on the surface of the high-entropy alloy after ultrasonic impact, grains are obviously refined, a gradient structure is formed from the surface to the core, andhardness and abrasion resistance are significantly improved. According to the method, a fine structure and a large number of microscopic defects can be obtained on the surface of the high-entropy alloy while the chemical composition of the surface of the high-entropy alloy is ensured to be unchanged and the toughness of the core is ensured, thus the hardness of the surface of the high-entropy alloy is increased by 1.8-2.5 times, the abrasion resistance is increased by 1.3-2.5 times, the method is simple, easy to operate, safe, reliable, small in 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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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)
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