Ceramic phase reinforced refractory high-entropy alloy composite materials and preparation method thereof

A high-entropy alloy and composite material technology is applied in the field of ceramic phase reinforced refractory high-entropy alloy composite materials and their preparation, which can solve the problems of increased preparation cost, complex alloy composition and difficulty, and achieve excellent mechanical properties at room temperature and high temperature. , the process is simple, easy to operate

Active Publication Date: 2021-12-14
SOUTHEAST UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0006] In summary, alloying elements on the basis of the existing refractory high-entropy alloy system to greatly improve the comprehensive mechanical propert...

Method used

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  • Ceramic phase reinforced refractory high-entropy alloy composite materials and preparation method thereof
  • Ceramic phase reinforced refractory high-entropy alloy composite materials and preparation method thereof
  • Ceramic phase reinforced refractory high-entropy alloy composite materials and preparation method thereof

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preparation example Construction

[0030] A method for preparing a ceramic phase reinforced refractory high-entropy alloy composite material, comprising the following steps:

[0031] Step 1: Take the corresponding elemental pure metal raw material according to the type of alloy component, remove the scale, ultrasonically clean and dry it, and make precise ingredients according to the alloy composition;

[0032] Step 2: Place the weighed raw materials of each element in the water-cooled copper mold crucible of the non-consumable vacuum arc melting furnace in order of the melting point of the elements from low to high, and place the ceramic phase at the bottom, and put the vacuum arc melting furnace The air pressure of the vacuum chamber is pumped to 5×10 -3 Below Pa;

[0033] Step 3: Arc smelting. In order to ensure the uniformity of the alloy, the smelting time is 160-200s each time after the alloy is melted, and each alloy ingot is smelted 6-8 times to ensure the composition is uniform;

[0034] Step 4: Take i...

Embodiment 1

[0039] Take Al with a purity of 99.9wt.% 2 o 3 Particles and Hf, Nb, Ta, Ti, V elemental pure metal particles with a purity of not less than 99.95wt.%. After the metal particles are mechanically polished to remove scale and ultrasonically cleaned and dried, the 2 o 3 Precise batching, the ratio is 19.56at.%Hf, 19.56at.%Nb, 19.56at.%Ta, 19.56at.%Ti, 19.56at.%V, 2.2at.%Al 2 o 3 . The weighed raw materials are placed in the water-cooled copper mold crucible of the vacuum arc melting furnace in the order of the melting point of the elements from low to high, and the ceramic phase is placed at the bottom. Vacuum the chamber to 5×10 before melting - 3 Pa, filled with argon to 0.7 atmospheres. When smelting, first smelt the titanium ingot in the furnace for 180s to remove the residual oxygen in the furnace cavity; when smelting the target alloy, keep it for 180s after the alloy is completely melted. In order to obtain alloy ingots with uniform composition, all samples were sm...

Embodiment 2

[0041] Take Al with a purity of 99.9wt.% 2 o 3 Particles and Hf, Nb, Ta, Ti, Zr, V elemental pure metal particles with a purity of not less than 99.95wt.%. After the metal particles are mechanically polished to remove scale and ultrasonically cleaned and dried, the 2 o 3 Precise batching, the ratio is 15.95at.% Hf, 15.95at.% Nb, 15.95at.% Ta, 15.95at.% Ti, 15.95at.% Zr, 15.95at.% V, 4.3at.% Al 2 o 3 . The weighed raw materials are placed in the water-cooled copper mold crucible of the non-consumable vacuum arc melting furnace in the order of the melting point of the elements from low to high, and the ceramic phase is placed at the bottom. Vacuum the chamber to 5×10 before melting -3 Pa, filled with argon to 0.7 atmospheres. When smelting, first smelt the titanium ingot in the furnace for 180s to remove the residual oxygen in the furnace cavity; when smelting the target alloy, keep it for 180s after the alloy is completely melted, and no alloy ingot with uniform compositi...

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Abstract

The invention relates to ceramic phase reinforced refractory high-entropy alloy composite materials and a preparation method thereof, and belongs to the technical field of material science and engineering. A series of ceramic phase reinforced refractory high-entropy alloy composite materials are prepared by adding a ceramic phase and using a non-consumable vacuum arc melting furnace. The preparation method is simple in process and convenient to operate; and the alloy is of a single BCC structure, the microstructure morphology is mainly dendritic crystals, interstitial atoms are introduced while a nanometer second phase is introduced, so that the average grain size is obviously reduced compared with a matrix refractory high-entropy alloy, the room-temperature and high-temperature mechanical properties are obviously improved, and the alloy has excellent high-temperature structure stability at the temperature of 800 DEG C. According to the ceramic phase reinforced refractory high-entropy alloy composite materials and the preparation method thereof, the service temperature of mechanical engineering equipment and parts can be obviously improved, the ceramic phase reinforced refractory high-entropy alloy composite materials are expected to replace nickel-based superalloys, and have a wide application prospect in the fields of aerospace, traffic transportation, petrochemical industry, mechano-electronics, automobile manufacturing and the like.

Description

technical field [0001] The invention belongs to the field of material science and engineering technology, and in particular relates to a ceramic phase-reinforced refractory high-entropy alloy composite material and a preparation method thereof. Background technique [0002] Refractory high-entropy alloys are solid solutions with simple crystal structures formed with four or more refractory elements as the main components at equiatomic ratios or near equiatomic ratios. They are new types of high-entropy alloys developed based on the development of high-temperature structural metals. alloy system. In 2010, the US Air Force Laboratory Senkov and others publicly reported the first specific alloy composition alloy, and the refractory high-entropy alloy has achieved great development in the past ten years. Due to its simple phase structure, excellent high temperature softening resistance, and good corrosion resistance, refractory high-entropy alloys have great applications in ext...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C32/00C22C1/10B22D18/06
CPCC22C30/00C22C32/0005C22C32/0015C22C32/0047C22C32/0052C22C32/0068C22C32/0073B22D18/06C22C1/1036
Inventor 沈宝龙王冰洁王倩倩孙博郭杨斌
Owner SOUTHEAST UNIV
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