A three-dimensional network structure high-entropy alloy and its preparation method

A high-entropy alloy and three-dimensional network technology, which is applied in the field of three-dimensional network structure high-entropy alloy and its preparation, can solve the problems of low plasticity of nanocrystalline alloy and low strength of high-entropy alloy, and achieves simple technical links and outstanding comprehensiveness. The effect of mechanical properties

Active Publication Date: 2021-11-09
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of low strength of high-entropy alloys and low plasticity of nanocrystalline alloys, the present invention proposes a three-dimensional network structure high-entropy alloy and a preparation method thereof. The specific technical scheme of the present invention is as follows:

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  • A three-dimensional network structure high-entropy alloy and its preparation method
  • A three-dimensional network structure high-entropy alloy and its preparation method
  • A three-dimensional network structure high-entropy alloy and its preparation method

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preparation example Construction

[0027] The invention uses powder metallurgy technology to control the grain size and three-dimensional space distribution of the alloy, and without changing the chemical composition of the alloy, through microstructure control, the strength of the alloy is greatly improved on the basis of ensuring plasticity. Specifically, a method for preparing a three-dimensional network structure high-entropy alloy is characterized in that the method includes the following steps:

[0028] S1: Ball milling process: Add high-entropy alloy powder into a ball milling container, and perform ball milling in an argon atmosphere to obtain ball-milled powder;

[0029]S2: Sintering process: put the ball-milled powder obtained in step S1 into a mold, and sinter in a spark plasma sintering device to obtain a three-dimensional network structure high-entropy alloy block.

[0030] The ball milling container in step S1 is a stainless steel ball milling tank, the ball-to-material ratio is 10:1, and the ball...

Embodiment 1

[0037] (1) Mechanical ball milling

[0038] 10 g of high-entropy alloy powder with an average particle size of about 110 μm and 100 g of stainless steel balls with a diameter of 3 mm were successively put into a stainless steel ball mill tank, and then the tank was completely sealed. The whole process was operated in a glove box filled with argon.

[0039] Then put the prepared ball mill jar on the planetary ball mill for ball milling, and place a symmetrical jar of the same quality on the other side to ensure the smooth operation of the ball mill. The ball milling speed is 200 revolutions per minute, and the ball milling time is 50 hours after turning for 60 minutes and stopping for 10 minutes, and adjusting the steering.

[0040] (2) Spark plasma sintering

[0041] Put the ball mill powder obtained in (1) into a graphite mold, place it in a spark plasma sintering equipment for sintering; the sintering temperature is 950°C, the heating rate is 100°C / min, and after reaching 9...

Embodiment 2

[0045] (1) Mechanical ball milling

[0046] 10 g of high-entropy alloy powder with an average particle size of about 110 μm and 100 g of stainless steel balls with a diameter of 3 mm were successively put into a stainless steel ball mill tank, and finally the tank was completely sealed. The whole process was operated in a glove box filled with argon. Then put the prepared ball mill jar on the planetary ball mill for ball milling, and place a symmetrical jar of the same quality on the other side to ensure the smooth operation of the ball mill. The ball milling speed is 200 revolutions per minute, turn for 60 minutes and stop for 10 minutes, and adjust the steering, and the ball milling time is 100 hours.

[0047] (2) Spark plasma sintering

[0048] Put the ball mill powder obtained in (1) into a graphite mold, place it in a spark plasma sintering equipment for sintering; the sintering temperature is 950°C, the heating rate is 100°C / min, and after reaching 900°C, it is adjusted...

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Abstract

The invention discloses a three-dimensional network structure high-entropy alloy and a preparation method thereof. A high-strength and tough high-entropy alloy with a special three-dimensional network structure is successfully prepared by adopting mechanical ball milling and discharge plasma sintering. The high-entropy alloy obtained through the technical solution of the present invention has a yield strength of 600-960 MPa, a tensile strength of 960-1230 MPa, and its uniform elongation ≥ 11%, exhibiting excellent high-strength-toughness matching, and isotropic The mechanical properties are expected to be used in the near-net shape of small metal components with various complex structures.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloy preparation, and in particular relates to a three-dimensional network structure high-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloys are a new type of metal material that has emerged in recent years, and are usually composed of four or more main elements in approximately equimolar ratios. High-entropy alloys are easy to form solid solutions with simple face-centered cubic, body-centered cubic, and close-packed hexagonal crystal structures, and show unique advantages in physical, chemical, and thermodynamic properties, especially in terms of mechanical behavior. High strength, high hardness , wear resistance, corrosion resistance, high temperature softening resistance and other excellent properties, it is a high-performance metal structural material with great application potential. At present, cubic crystal structure high-entropy alloys...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C22C30/00C22C1/04
CPCC22C1/04C22C30/00
Inventor郑瑞晓李国栋肖文龙马朝利
OwnerBEIHANG UNIV