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Strong and tough high-entropy alloy forming structure and its preparation method

A high-entropy alloy, strong and tough technology, applied in the field of strong and tough high-entropy alloy forming structure and its preparation, to achieve the effect of large size

Active Publication Date: 2022-06-07
ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In recent years, although a small number of scholars have prepared relatively large high-entropy alloy additively manufactured structures and studied their tensile mechanical properties (see literature 1, 2), however, the above-mentioned high-entropy alloy additively manufactured structures Both require heat treatment to achieve their strong plasticity balance, which to some extent limits the efficient and rapid additive manufacturing of high-entropy alloys in engineering applications.

Method used

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  • Strong and tough high-entropy alloy forming structure and its preparation method
  • Strong and tough high-entropy alloy forming structure and its preparation method
  • Strong and tough high-entropy alloy forming structure and its preparation method

Examples

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example 1）

[0031] This example is Al 0.4 CoCu 0.6 NiSi 0.2 The preparation of high-entropy alloy powder, the specific method is as follows:

[0032] S1: The Al, Co, Cu, Ni, Si bulk materials (purity ≥99.9%) are used to remove impurities and oxide film on the original surface of the metal by a grinding machine, and then Al 0.4 CoCu 0.6 NiSi 0.2 Ingredients, the total weight is 20kg.

[0033] S2: Put the metal block materials in step S1 into the vacuum induction melting furnace in order of melting point from low to high, and vacuumize until the degree of vacuum is less than 2.5×10 -3 MPa, then filled with argon to a pressure of 5 × 10 -2 Pa, under the protection of argon, the alloy is heated and melted by an induction coil to start melting. The melting time is 30 minutes, and electromagnetic stirring is introduced during the melting process to ensure the uniformity of the alloy composition.

[0034] S3: Introduce nitrogen through the tightly coupled annular slot nozzle of the atomiz...

Embodiment 1）

[0042] The preparation method of the strong and tough high-entropy alloy forming structure of the present embodiment has the following steps:

[0043] ①Substrate preparation.

[0044]Cut the 45# steel wire into a rectangular block sample with a size of 150×100×30mm, then use 200#, 400#, 800# sandpaper to grind off the oxide skin on the surface, and then use acetone and alcohol to clean the surface repeatedly. , and finally dried, packaged, and used as a substrate.

[0045] ②Powder preparation.

[0046] Example 1 adopts the Al prepared by gas atomization rapid solidification technology 0.4 CoCu 0.6 NiSi 0.2 The high-entropy alloy powder with a particle size range of 50 to 150 μm is placed in a drying oven and dried at a temperature of 120 ° C for 2 hours to remove moisture to increase the fluidity of the powder.

[0047] ③ The high-entropy alloy forming structure was prepared by laser cladding forming technology.

[0048] The forming path used for the laser cladding in th...

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Abstract

The invention discloses a strong and tough high-entropy alloy forming structure and a preparation method thereof. The strong and tough high-entropy alloy forming structure is made of gas-atomized Al with a particle size range of 50-150 μm. 0.4 CoCu 0.6 NiSi 0.2 The high-entropy alloy powder is prepared by laser cladding forming technology. The specific preparation methods include: ①Matrix preparation; ②Powder preparation; ③Laser cladding forming to prepare a strong and tough high-entropy alloy forming structure; The parameters are: the spot diameter is 4.5mm, the powder feeding rate is 25g / min, the laser power is 2600W, and the scanning speed is 12mm / s. The formed structure of the high-entropy alloy prepared by the invention has higher strength and better plasticity, can realize strong plasticity balance without heat treatment, and has a relatively large size.

Description

technical field [0001] The invention belongs to the technical field of high-entropy alloy additive remanufacturing, and particularly relates to a strong and tough high-entropy alloy forming structure and a preparation method thereof. Background technique [0002] High-entropy alloys are high-entropy solid solution alloys that break through the traditional alloy design concept and consist of a variety of principal elements. Due to their excellent comprehensive properties such as high strength, high hardness, wear resistance, and corrosion resistance, they have good potential engineering application value. [0003] Most of the high-entropy alloys currently studied are vacuum arc smelting blocks, the alloy size is limited, and many high-entropy alloys have high strength, poor plasticity or good plasticity and low strength. Many scholars choose to study their compressive mechanical properties. Therefore, it is very important for the engineering application of high-entropy alloys...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C22C30/02B22F9/08B33Y10/00
CPCC23C24/106C22C30/02B22F9/082B33Y10/00Y02P10/25
Inventor 王晓明常青陈永星朱胜赵阳韩国峰高雪松杨柏俊林鑫杨海欧肖猛任智强王文宇李华莹彭战武
Owner ARMOR ACADEMY OF CHINESE PEOPLES LIBERATION ARMY