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High-entropy alloy and preparation method thereof

A high-entropy alloy and compound technology, applied in the field of metal materials, can solve the problems of increasing the density of alloys, limiting the application of alloys, and being unable to inhibit the formation and growth of helium bubbles

Active Publication Date: 2022-05-27
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the subsequent increase in the density of the alloy greatly limits the application of the alloy.
However, the content of heavy elements with high melting point in low-density refractory high-entropy alloys is not high enough, resulting in poor high-temperature performance
At the same time, the single-phase body-centered cubic structure refractory high-entropy alloy has a single matrix structure, which cannot inhibit the formation and growth of helium bubbles, making its radiation resistance (especially helium embrittlement and swelling resistance) insufficient.

Method used

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  • High-entropy alloy and preparation method thereof

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preparation example Construction

[0057] The application also provides a method for preparing a high-entropy alloy, comprising:

[0058] S1. Prepare raw materials

[0059] The raw materials include niobium precursors, vanadium precursors, tantalum precursors, and M precursors, and optionally, elemental boron. The elemental boron can be selectively added according to requirements, so that the molar ratio of Nb, V, Ta, M and B elements in the material is is a:b:c:d:e.

[0060] In high-entropy alloys, niobium (Nb) element is introduced in the form of niobium precursor, and the niobium precursor is niobium and / or niobium diboride; vanadium (V) element is introduced in the form of vanadium precursor, and the vanadium precursor is Vanadium element and / or vanadium diboride; tantalum (Ta) element is introduced in the form of tantalum precursor, tantalum precursor is tantalum element and / or tantalum diboride, M element is introduced in the form of M precursor, M precursor M element and / or M boride, and boron (B) elem...

Embodiment 1

[0080] The embodiments of the present application provide a high-entropy alloy and a preparation method thereof, comprising the following steps:

[0081] S1. Prepare raw materials

[0082] Prepare niobium element, vanadium element, tantalum element and tantalum diboride with a purity of more than 99.95%, use sandpaper to remove the oxide layer on the surface, and then accurately weigh and calculate the Nb, V, Ta and B elements in the raw material with a balance. The molar ratio is 35:35:15:15.

[0083] S2, smelting

[0084]Put the weighed raw materials into the crucible, and place them from high to low according to the melting point of the metal element and / or compound, that is, first place the raw material with the lowest melting point at the bottom of the crucible, and then place the raw material with the lowest melting point at the bottom of the crucible. The raw material with the higher melting point is placed on the surface of the raw material, and the raw material with...

Embodiment 2

[0086] The embodiment of the present application provides ++, which comprises the following steps:

[0087] S1. Prepare raw materials

[0088] Prepare niobium, vanadium, tantalum, molybdenum and tantalum diboride with a purity of more than 99.95%, use sandpaper to remove the oxide layer on the surface, and then accurately weigh and calculate the Nb, V, Ta, The molar ratio of Mo and B elements is 33:33:11:5:18.

[0089] S2, smelting

[0090] Put the weighed raw materials into the crucible, and place them from high to low according to the melting point of the metal element and / or compound, that is, first place the raw material with the lowest melting point at the bottom of the crucible, and then place the raw material with the lowest melting point at the bottom of the crucible. The raw material with the higher melting point is placed on the surface of the raw material, and the raw material with the lower melting point is covered in turn, until the placement of the raw material...

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Abstract

The invention provides a high-entropy alloy and a preparation method thereof, and belongs to the technical field of metal materials. The component of the high-entropy alloy is NbaVbTacMdBe, M is any one or more of Ti, Mo, Zr, Cr, Al and W, a, b, c, d and e respectively represent the molar percentages of corresponding elements, a is more than or equal to 5 and less than or equal to 35, b is more than or equal to 5 and less than or equal to 35, c is more than or equal to 5 and less than or equal to 35, e is more than or equal to 5 and less than or equal to 25, and a + b + c + d + e = 100. The refractory metal in the high-entropy alloy and B easily form a (V, Nb, Ta, M) 3B2 ordered boride phase, the crystal structure of the phase belongs to a tetragonal system, the phase and a BCC phase formed by refractory elements easily form a regular lamellar eutectic structure, and the overall radiation resistance of the high-entropy alloy material is improved. And the high-entropy alloy shows excellent high-temperature softening resistance, and can meet the requirements on the mechanical properties of the alloy under the strong irradiation service condition.

Description

technical field [0001] The present application relates to the technical field of metal materials, in particular, to a high-entropy alloy and a preparation method thereof. Background technique [0002] Radiation-resistant metal structural materials are key materials used in advanced spacecraft nuclear power plants. The development of advanced spacecraft nuclear power devices requires its structural materials to have excellent radiation resistance (mainly anti-helium embrittlement and swelling properties) and excellent high-temperature mechanical properties. It is of great significance to develop new radiation-resistant alloys. [0003] Due to the similar content of several main components, high-entropy alloys do not have specific solvents and solutes, but can be regarded as high-concentration solutes. The atoms of any one component have a radius difference from the atoms of all other components, which makes the lattice distortion of the high-entropy alloy solid solution to a...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
CPCC22C30/00C22C1/02Y02E30/30
Inventor 疏达吴明旭杨超王舒滨祝国梁汪东红孙宝德
Owner SHANGHAI JIAO TONG UNIV
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