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Method for preparing Ni-Mo-P coating on surface of high-entropy alloy

A high-entropy alloy, ni-mo-p technology, applied in the field of materials, can solve the problems of low strength and high plasticity, and achieve the effect of improving the tensile strength at room temperature

Inactive Publication Date: 2020-01-07
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Studies have shown that the structure of the material determines the performance. For the high-entropy alloy with the face-centered cubic structure, it often exhibits the characteristics of large plasticity and low strength, which limits its practical application to a certain extent.

Method used

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  • Method for preparing Ni-Mo-P coating on surface of high-entropy alloy
  • Method for preparing Ni-Mo-P coating on surface of high-entropy alloy
  • Method for preparing Ni-Mo-P coating on surface of high-entropy alloy

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Effect test

Embodiment 1

[0032] Traditional high-entropy alloys generally increase their strength by changing the internal structure. The invention breaks the traditional thinking and improves the mechanical properties from the outside without changing the internal structure of the material. The present invention adopts the method of chemical deposition, deposits Ni-No-P coating on the surface of CoCrFeNi high-entropy alloy, and forms Ni-Mo-P / CoCrFeNi / Ni-Mo-P sandwich structure through heat treatment, so as to achieve the purpose of improving the strength of the matrix Purpose.

[0033] The specific implementation process is as follows:

[0034] Step 1, preparation of chemical plating solution

[0035] ①The process formula of each component is as follows:

[0036] Nickel Sulfate (NiSO 4 •6H 2 O) 25g / L

[0037] Sodium hypophosphite (NaH 2 PO 2 •H 2 O) 24g / L

[0038] Sodium molybdate (Na 2 MoO 4 • 2H 2 O) 0.3 g / L

[0039] Sodium citrate (NaC 3 h 5 O7) 25g / L

[0040] Sodium acetate (CH 3...

Embodiment 2

[0069] In addition to the face-centered cubic high-entropy alloy CoCrFeNi in the above-mentioned embodiment 1, the Ni-Mo-P coating also has a strengthening effect on other face-centered cubic high-entropy alloys, such as Al 0.3 CoCrFeNi. In the case of maintaining the preparation method of the high-entropy alloy matrix in the above-mentioned embodiment 1 and other process conditions unchanged, the high-entropy alloy matrix is ​​replaced by Al 0.3 For CoCrFeNi, in order to obtain the effect of different heat treatment times on the mechanical properties of composite materials, the heat treatment times in the experiment were 400 ± 10°C / 1 h, 500 ± 10°C / 3h, 500 ± 10°C / 6h. After the samples under different heat treatment times were cleaned, the tensile mechanical properties at room temperature were tested, and compared with the mechanical properties of the uncoated high-entropy alloy substrate.

[0070] Figure 5 The room temperature tensile engineering stress-strain curves of coa...

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Abstract

The invention discloses a method for preparing a Ni-Mo-P coating on the surface of a high-entropy alloy. The method is characterized in that the surface of the high-entropy alloy is plated with a layer of Ni-Mo-P coating, then the bonding force between the coating and the matrix is improved through heat treatment, and the obtained coating improves the room temperature tensile strength of the high-entropy alloy; and finally, the composite material with a sandwich structure of Ni-Mo-P / high-entropy alloy / Ni-Mo-P is formed. According to the method, aiming at the characteristics of low strength of an FCC structure high-entropy alloy, the surface of the high-entropy alloy is plated with the layer of Ni-Mo-P coating, and the bonding force between the coating and the matrix is improved through heat treatment, so that the room temperature tensile strength of the high-entropy alloy is improved; and compared with the high-entropy matrix without coating, the room temperature tensile strength ofthe coated composite material is greatly improved.

Description

technical field [0001] The invention relates to a method for preparing a Ni-Mo-P coating on the surface of a high-entropy alloy, belonging to the technical field of materials. Background technique [0002] For thousands of years, the development history of human beings has been closely linked with the development history of metal materials. Metal materials have always been one of the most important materials for human beings, and have great significance in national economy and social life. High-entropy alloys have unique structures, novel alloy design concepts and excellent comprehensive properties, such as high strength, high hardness, excellent corrosion resistance and thermal stability, outstanding fatigue resistance and fracture strength, etc., which have attracted everyone Widespread concern. Studies have shown that the structure of the material determines the performance. For the high-entropy alloy with the face-centered cubic structure, it often exhibits the charact...

Claims

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Application Information

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IPC IPC(8): C23C18/50C23C18/16
CPCC23C18/1692C23C18/50
Inventor 乔珺威宋萧婷王重杨慧君王雪姣石晓辉吴玉程
Owner TAIYUAN UNIV OF TECH
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