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Method for preparing high-toughness eutectic high-entropy alloy based on selective laser melting technology

A technology of laser selective melting and high-entropy alloys, which is applied in the direction of additive manufacturing, energy efficiency improvement, process efficiency improvement, etc., can solve problems such as the inability to achieve high dimensional accuracy and geometric complexity of metal components, and limit engineering applications

Active Publication Date: 2021-06-11
NORTHWESTERN POLYTECHNICAL UNIV
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, a study on the preparation of eutectic high-entropy alloys using laser 3D printing technology is reported. The laser near-net forming technology is used, which is a laser 3D printing technology based on powder feeding, but the laser near-net forming cannot realize the metal components. High dimensional accuracy and geometric complexity limit engineering applications

Method used

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  • Method for preparing high-toughness eutectic high-entropy alloy based on selective laser melting technology
  • Method for preparing high-toughness eutectic high-entropy alloy based on selective laser melting technology
  • Method for preparing high-toughness eutectic high-entropy alloy based on selective laser melting technology

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Experimental program
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Embodiment 1

[0044] A method for preparing a high-strength and toughness eutectic high-entropy alloy based on laser selective melting technology, comprising the following steps:

[0045] (1) Put the gas-atomized AlCoCrFeNi pre-alloyed powder and Ni powder with a purity >99% into the ball mill tank of the planetary ball mill, then pour analytical pure alcohol to submerge the powder, control the ball-to-material ratio to 1:1, and use 200r / Min speed ball milling 4h, after ball milling, the product of ball milling is put into oven, is dried at 100 ℃ for 10h, obtains mixed powder; According to mole percentage, the content of AlCoCrFeNi pre-alloyed powder in described mixed powder is 48%, Ni The powder content is 52%; the particle size distribution of the gas-atomized AlCoCrFeNi pre-alloyed powder and the Ni powder with a purity >99% is independently 13-53 μm;

[0046] (2) Use Magics. software to establish a three-dimensional model of the formed part and set slices, and save it as a CLI. file; ...

Embodiment 2

[0048] The process parameters of laser selective melting and forming are set as follows: laser power is 350W, scanning speed is 660mm / s, powder layer thickness is 40μm, scanning distance is 75μm, and other conditions are the same as in Example 1.

Embodiment 3

[0050] The process parameters of selective laser fusion forming are set as follows: laser power 300W, scanning speed 630mm / s, powder layer thickness 50μm, scanning distance 75μm, and other conditions are the same as in Example 1.

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Abstract

The invention provides a method for preparing a high-toughness eutectic high-entropy alloy based on a selective laser melting technology, and belongs to the technical field of metal material laser additive manufacturing. The molar ratio of the AlCoCrFeNi pre-alloy powder to the Ni powder is controlled, the proportion of all elements in the eutectic high-entropy alloy is guaranteed, and a complete eutectic structure is obtained in the alloy; by optimizing the technological parameters of selective laser melting forming, the compactness of the eutectic high-entropy alloy is improved, meanwhile, the residual stress in the eutectic high-entropy alloy is reduced, cracks are prevented from being formed in the alloy, the obtained eutectic high-entropy alloy can achieve high compactness without subsequent treatment, the mechanical property of the eutectic high-entropy alloy is improved, and integrated precision forming of the high-strength and high-toughness eutectic high-entropy alloy complex structural part is achieved. The result of the embodiment shows that the density of the eutectic high-entropy alloy prepared through the preparation method is larger than 98%, the yield strength is larger than 970 MPa, and the tensile strength is larger than or equal to 1270 MPa.

Description

technical field [0001] The invention relates to the technical field of laser additive manufacturing of metal materials, in particular to a method for preparing high-strength and tough eutectic high-entropy alloys based on laser selective melting technology. Background technique [0002] Eutectic high-entropy alloys have the characteristics of both eutectic alloys and high-entropy alloys. Compared with traditional high-entropy alloys, eutectic high-entropy alloys have ultra-high plasticity, wear resistance and corrosion resistance, and have great research value. At present, the methods used to prepare eutectic high-entropy alloys are generally vacuum arc melting technology and directional solidification technology. Vacuum arc melting technology refers to placing a certain proportion of pure metal in a crucible, then placing the whole in a vacuum furnace to evacuate, and then filling it with argon gas. After the metal is completely melted, it is cast in a water-cooled steel m...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F10/28B22F10/366B33Y10/00C22C1/04
CPCB22F3/105B33Y10/00C22C1/0433Y02P10/25
Inventor 苏海军郭一诺张军郭敏刘林傅恒志
Owner NORTHWESTERN POLYTECHNICAL UNIV
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