A kind of high entropy alloy material and preparation method thereof

A high-entropy alloy and alloy powder technology, which is applied in the coating process and coating of metal materials, can solve the problem of limited amount of added elements, and achieve the effects of no cracks, good high-temperature stability, and high-temperature oxidation resistance

Active Publication Date: 2019-05-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The traditional alloy system is usually based on one element, the content of the main element usually accounts for more than 50 at%, and a small amount of other elements are added to change the structure and performance, but the amount of added elements is limited due to solid solubility

Method used

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  • A kind of high entropy alloy material and preparation method thereof
  • A kind of high entropy alloy material and preparation method thereof
  • A kind of high entropy alloy material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The laser cladding high-entropy alloy material in this embodiment is composed of six metal element powders of Ti, Al, Cu, Ni, Mn, Co, Nb and Hf, and the atomic percentage of each component is 17% Cu, 16% Ni, 15% Mn, 16% Co, 17% Nb, 19% Hf.

[0027] The preparation method of the high-entropy alloy material cladding layer described in this embodiment comprises the following steps:

[0028] (1) Grind the substrate with 600-grit sandpaper to remove the scale, and then clean it with alcohol;

[0029] (2) Vacuum ball mill each weighed powder for 2.5 hours and fully mix to obtain alloy powder with a particle size of 180-250 mesh;

[0030] (3) Evenly press the alloy powder material obtained in step (2) on the surface of the base material treated in step (1) to form a prefabricated layer. The thickness of the prefabricated powder is 1.0mm. After drying, the cladding layer can be obtained by laser cladding , The process parameters for laser cladding are: laser power 3500W, scan...

Embodiment 2

[0035] The laser cladding high-entropy alloy material in this embodiment is composed of six metal element powders of Ti, Al, Cu, Ni, Mn, Co, Nb and Hf, and the atomic percentage of each component is 18% Cu, 15% Ni, 16% Mn, 17% Co, 19% Nb, 15% Hf.

[0036] The preparation method of the high-entropy alloy material cladding layer described in this embodiment comprises the following steps:

[0037] (1) Grind the substrate with 600-grit sandpaper to remove the scale, and then clean it with alcohol;

[0038] (2) Vacuum ball mill each weighed powder for 3 hours and fully mix to obtain alloy powder with a particle size of 200-300 mesh;

[0039] (3) Evenly press the alloy powder material obtained in step (2) on the surface of the base material treated in step (1) to form a prefabricated layer. The thickness of the prefabricated powder is 0.9mm. After drying, the cladding layer can be obtained by laser cladding , The process parameters for laser cladding are: laser power 4000W, scanni...

Embodiment 3

[0044] The laser cladding high-entropy alloy material in this embodiment is composed of six metal element powders of Ti, Al, Cu, Ni, Mn, Co, Nb and Hf, and the atomic percentage of each component is 20% Cu, 18% Ni, 13% Mn, 15% Co, 13% Nb, 21% Hf.

[0045] The preparation method of the high-entropy alloy material cladding layer described in this embodiment comprises the following steps:

[0046] (1) Grind the substrate with 600-grit sandpaper to remove the scale, and then clean it with alcohol;

[0047] (2) Carry out vacuum ball milling for each weighed powder, the ball milling time is 3.5 hours, and fully mix to obtain alloy powder with a particle size of 180-280 mesh;

[0048](3) Evenly press the alloy powder material obtained in step (2) on the surface of the base material treated in step (1) to form a prefabricated layer. The thickness of the prefabricated powder is 1.1mm. After drying, the cladding layer can be obtained by laser cladding , The process parameters for lase...

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Abstract

The invention discloses a high-entropy alloy material and a preparation method thereof, and belongs to the field of laser surface modification. The high-entropy alloy material comprises, by atomic percent, 10%-20% of Cu, 15%-20% of Ni, 13%-20% of Mn, 15%-18% of Co, 13%-19% of Nb and 15%-21% of Hf, and the sum of all the components is 100%. The preparation method comprises the steps that calculation is carried out according to the proportion, after the mass of each component is accurately weighed, the ball grinding technology is applied to fully and uniformly mixing the components, a mixture isuniformly pressed on the surface of a matrix material, a cladding layer can be obtained through laser cladding processing after drying, and the matrix material is aluminum alloy 7075. A coating obtained through laser cladding has a good macroscopic shape and has the beneficial effects of high hardness, high friction and wear resistance, high high-temperature oxidation resistance, high bonding strength with a matrix and the like, and a high-entropy alloy has many characteristics superior to those of traditional alloys and has great research and application prospects.

Description

technical field [0001] The invention relates to the field of laser surface modification, in particular to a high-entropy alloy material and a preparation method thereof. Background technique [0002] Traditional alloy systems usually use one element as the main component, and the content of the main element usually accounts for more than 50 at%, and a small amount of other elements are added to change the structure and properties, but the amount of added elements is limited due to solid solubility. In order to break through this limitation, Chinese Taiwanese scholar Ye Junwei broke the traditional concept in 1995 and first proposed the concept of high-entropy alloy design based on the research of bulk amorphous alloys. The number of principal elements of high-entropy alloys is n≥5, and the content of each element is 5-35 at%. After solidification, this alloy mainly forms a simple solid solution phase instead of a complex brittle phase due to the high entropy effect. This i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/02C22C1/04C23C24/10
CPCC22C1/04C22C30/02C23C24/106
Inventor 刘洪喜石海郑必举张晓伟刘子峰王悦怡
Owner KUNMING UNIV OF SCI & TECH
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