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Refractory medium-entropy alloy and preparation method thereof

An entropy alloy and refractory technology, applied in the field of refractory entropy alloy and its preparation, can solve the problems of increased preparation cost, complex alloy composition and difficulty, and achieve excellent high temperature microstructure stability, low alloying degree, The effect of increasing the service temperature

Active Publication Date: 2022-03-04
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, alloying elements on the basis of the existing refractory high-entropy alloy system to greatly improve the comprehensive mechanical properties of the material in a wide temperature range is not only extremely difficult, but also makes the alloy composition more complex and increases the preparation cost

Method used

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  • Refractory medium-entropy alloy and preparation method thereof
  • Refractory medium-entropy alloy and preparation method thereof
  • Refractory medium-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Take Ta, Mo, Nb elemental pure metal particles with a purity of not less than 99.95wt.%, mechanically polish to remove scale, and ultrasonically clean and dry them, then proceed according to the atomic ratio of 35at.%Ta-40at.%Mo-25at.%Nb Precise ingredients. The weighed three kinds of pure metal raw materials are successively distributed in the water-cooled copper mold crucible of the non-consumable vacuum arc melting furnace according to the order of the melting point of the elements from low to high. Vacuum the chamber to 4×10 before melting -3 Pa, filled with argon to 0.7 atmospheres. When smelting, first smelt the titanium ingot in the furnace for 3 minutes to remove the residual oxygen in the furnace cavity; when smelting the target alloy, keep it for 150s after the alloy is completely melted, then cool, turn the alloy ingot and melt again, a total of 6 melting times to ensure that the alloy composition is uniform .

[0028] A small sample of 10 mm × 10 mm × 4 m...

Embodiment 2

[0030] Take W, Hf, V elemental pure metal particles with a purity of not less than 99.95wt.%, mechanically polish to remove the scale, and ultrasonically clean and dry them, then proceed according to the atomic ratio of 30at.%W-35at.%Hf-35at.%V Precise ingredients. The weighed three kinds of pure metal raw materials are successively distributed in the water-cooled copper mold crucible of the non-consumable vacuum arc melting furnace according to the order of the melting point of the elements from low to high. Vacuum the chamber to 4×10 before melting -3 Pa, filled with argon to 0.7 atmospheres. When smelting, first melt the titanium ingot in the furnace for 3 minutes to remove the residual oxygen in the furnace cavity; when smelting the target alloy, keep the alloy for 150 seconds after it is completely melted, then cool, turn the alloy ingot and melt again, and melt for 6 times in total to ensure that the alloy composition is uniform .

[0031] A rectangular thin slice sam...

Embodiment 3

[0033] Take W, Zr, Ti elemental pure metal particles with a purity of not less than 99.95wt.%, mechanically polish to remove scale, and ultrasonically clean and dry them, then proceed according to the atomic ratio of 20at.%W-50at.%Zr-30at.%Ti Precise ingredients. The weighed three kinds of pure metal raw materials are successively distributed in the water-cooled copper mold crucible of the non-consumable vacuum arc melting furnace according to the order of the melting point of the elements from low to high. Vacuum the chamber to 4×10 before melting -3 Pa, filled with argon to 0.7 atmospheres. When smelting, first melt the titanium ingot in the furnace for 3 minutes to remove the residual oxygen in the furnace cavity; when smelting the target alloy, keep the alloy for 150 seconds after it is completely melted, then cool, turn the alloy ingot and melt again, and melt for 6 times in total to ensure that the alloy composition is uniform .

[0034] Cutting from the middle of the...

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Abstract

The invention discloses a refractory medium-entropy alloy and a preparation method thereof, the refractory medium-entropy alloy is composed of three metal elements, the chemical formula is recorded as AaBbCc, and the atomic percentage content of the elements satisfies the following conditions: 15% < = a < = 70%, 15% < = b < = 70%, 15% < = c < = 70%, and a + b + c = 100. The preparation method comprises the following steps: weighing metal raw materials of each element, and carrying out electric arc melting in a non-self-consumption vacuum environment; and cooling to room temperature and taking out. Through an alloy design strategy of reducing components, the effect of stabilizing a crystal structure of'mixed enthalpy 'in a high-temperature environment can be fully played, room-temperature strengthening and toughening of the alloy can be further promoted by utilizing'mixed enthalpy', and on the premise of ensuring that the alloy has good high-temperature tissue structure stability and excellent high-temperature strength, the alloy has excellent mechanical properties and mechanical properties. And the room-temperature mechanical property of the alloy is greatly improved. A series of refractory medium-entropy alloys are prepared by using a non-consumable vacuum arc melting furnace, and the alloying degree is lower.

Description

technical field [0001] The invention relates to a refractory alloy and a preparation method thereof, in particular to a refractory medium-entropy alloy and a preparation method thereof. Background technique [0002] Refractory high-entropy alloys are new high-temperature-resistant alloys that use four or more elements with equiatomic ratios or nearly equiatomic ratios as the main components to form simple solid solutions. Due to its simple phase structure, stable structure at high temperature, and excellent corrosion resistance, it has great application potential in extreme service environments such as navigation and aerospace, deep space exploration, national defense and military industry, and nuclear power energy. [0003] Refractory high-entropy alloys are mainly divided into two categories, W-Ta-Mo-Nb refractory high-entropy alloys and Ta-Nb-Hf-Zr-Ti refractory high-entropy alloys. The W-Ta-Mo-Nb refractory high-entropy alloy has a very high melting point and has excell...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02C22B9/04C22B9/20C22C27/02
CPCC22C30/00C22C1/02C22B9/04C22B9/20C22C27/02
Inventor 沈宝龙孙博梁秀兵王倩倩陈永雄王鑫
Owner SOUTHEAST UNIV
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