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Powder and preparation technology for laser high-entropy alloying of copper single-element based alloy

A high-entropy alloy and single-element technology, which is applied in the coating process and coating of metal materials, can solve the problems of poor formability of the modified layer, difficult coating forming quality and surface continuity, etc., to reduce brittleness, simplify Solid solution phase structure, effect of improving hardness and wear resistance

Active Publication Date: 2015-05-13
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the large differences in thermophysical properties such as density, melting point, specific heat and expansion coefficient between different types of metal elements in high-entropy alloy powders and between them and the base material, they are directly used in laser cladding, thermal spraying, etc. It is difficult to obtain a coating with uniform composition by surface modification technology, which makes it difficult for the forming quality and surface continuity of the coating to meet the requirements of practical applications
[0004] As we all know, copper alloy has good thermal conductivity, and is often used to prepare important heat-conducting parts such as crystallizers. However, copper has a high reflectivity to laser light, and the formability of the surface modification layer in the laser cladding and alloying process is relatively poor. At present, There are few reports at home and abroad on the preparation of high-entropy alloy modified layers on copper and its alloys by laser cladding or alloying

Method used

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  • Powder and preparation technology for laser high-entropy alloying of copper single-element based alloy
  • Powder and preparation technology for laser high-entropy alloying of copper single-element based alloy
  • Powder and preparation technology for laser high-entropy alloying of copper single-element based alloy

Examples

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Effect test

Embodiment 1

[0041] Preparation of FeCoCrAl quaternary alloy powders.

[0042] The FeCoCrAl quaternary alloy powder is prepared in an equimolar ratio of 1:1:1:1, and the prepared alloy powder needs to be ground and mixed in a star ball mill or a mortar for 2-5 hours. The ball milling or grinding of the mixed powder is carried out at room temperature, the temperature is 23±1°C, and the relative humidity is 40±10%. Then place the uniformly mixed powder in a vacuum drying oven for 2-8 hours for later use, and the alloy powder does not react during the ball milling process.

Embodiment 2

[0044] Preparation of FeCoCrAlCu laser high-entropy alloying layer on the surface of copper substrate.

[0045] FeCoCrAl alloy powder is prepared at an equimolar ratio of 1:1:1:1. The prepared powder is ground and dried and then placed on the surface of the copper substrate. The thickness of the alloy powder is 0.5-0.7mm. Nd:YAG solid-state pulsed laser is used for single-pass and multi-pass laser irradiation alloying treatment. The specific process parameters are: voltage 380V, current 150-170A, spot diameter 1.2mm, scanning speed 4mm / s. During the laser alloying process, the protective gas argon flow rate is 10-20L / min, and the main element copper of the single-element-based alloy substrate melts into the coating to participate in the surface alloying process during laser irradiation, and the thickness of the laser alloyed layer is 0.3- 0.5mm.

Embodiment 3

[0047] The FeCoCrAlCu alloyed layer on the surface of the copper substrate was prepared under the condition of low laser irradiation process parameter current (I=130A).

[0048] FeCoCrAl alloy powder is prepared at an equimolar ratio of 1:1:1:1. The prepared powder is ground and dried and then placed on the surface of the copper substrate. The thickness of the alloy powder is 0.5-0.7mm. A Nd:YAG solid-state pulsed laser is used for single-pass laser irradiation. The specific process parameters are: voltage 380V, current 130A, spot diameter 1.2mm, and scanning speed 4mm / s. During the laser alloying process, the protective gas argon flow rate is 10-20L / min. The content of matrix elements in the prepared coating layer is very low, and a large number of cracks appear in the coating layer, making it difficult to form a metallurgical bond.

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Abstract

The invention relates to powder and a preparation technology for laser high-entropy alloying of a copper single-element based alloy , and belongs to the technical field of surface engineering. The novel alloyed powder and the technique for excellent property high-entropy alloy coating preparation on a copper alloy surface are provided. The alloyed powder comprises Fe, Co, Cr and Al in equal molar ratios. By the adoption of an appropriate laser irradiation technological parameter, a high-entropy alloying coating with good metallurgical bonding with a copper single element radical alloy base material and an excellent property is prepared through the laser reactive synthesis-surface alloying method. The high-entropy alloying coating comprises five main components, Fe, Co, Cr, Al and Cu. The defect that an original multi-component alloy is prone to generate a lot of brittle phase precipitation is overcome. The phase composition of the alloying coating is a solid solution of simple FCC and BCC structures, the organization is uniform and fine without cracks, the brittleness of a multi-component alloy is reduced greatly, and the application prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, and in particular relates to a formula and a process method of powder used for preparing a high-entropy alloy coating by laser reaction synthesis on the surface of a copper single-element-based alloy substrate. Background technique [0002] Different from traditional alloys, multi-principal high-entropy alloys break through the design concept of traditional alloys with one or two metal elements as the main components. Ratio composition, the atomic fraction of each element is between 5% and 35%, which is a brand-new alloy design concept. High-entropy alloys have a variety of microstructure and performance characteristics that are different from traditional alloys. According to traditional metallurgical principles, multi-principal alloys usually easily lead to the formation of various intermetallic compounds, and other complex ordered phases are prone to appear during the solid solutio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00C22C30/00C23C24/10
Inventor 张春华单丽娜张松吴臣亮丁燕燕李丹张文吉何斯文张昊天
Owner SHENYANG POLYTECHNIC UNIV
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