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High-temperature-resistance VNbMoTa high-entropy alloy and preparation method thereof

A high-entropy alloy and high-temperature-resistant technology, which is applied in the field of high-temperature-resistant VNbMoTa high-entropy alloy and its preparation, can solve problems such as unsatisfactory strength, and achieve good application prospects, good room temperature workability, and good room temperature plasticity.

Inactive Publication Date: 2018-12-07
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

The compressive plasticity of this alloy at room temperature exceeds 50%, but the strength of this alloy at a high temperature exceeding 1000°C is not very satisfactory

Method used

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  • High-temperature-resistance VNbMoTa high-entropy alloy and preparation method thereof
  • High-temperature-resistance VNbMoTa high-entropy alloy and preparation method thereof
  • High-temperature-resistance VNbMoTa high-entropy alloy and preparation method thereof

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] 1. Alloy composition design and preparation

[0024] Design of two VNbMoTa-based high-entropy alloys with different compositions: V 25 Nb 25 Mo 25 Ta 25 and V 10 Nb 40 Mo 10 Ta 40 .

[0025] High temperature V 25 Nb 25 Mo 25 Ta 25 and V 10 Nb 40 Mo 10 Ta 40 High entropy alloys are prepared by the following methods:

[0026] 1. Select pure metals V, Nb, Mo, and Ta as raw materials, use a grinder to remove the oxide skin on the surface of the raw materials, and expose the bright metal surface for later use. Weigh the prepared pure metal according to the mass fraction of each element in Table 1.

[0027] 2. Put the weighed raw materials into the copper crucible in the non-consumable vacuum melting furnace in sequence according to the melting point. Close the furnace door, turn on the cooling water, and start vacuuming until the va...

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Abstract

The invention relates to a high-temperature-resistance VNbMoTa high-entropy alloy and a preparation method thereof, and belongs to the field of metal materials and preparation thereof. An atomic percent expression of components of the alloy is VaNbbMocTad, wherein a is not more than 35 and not less than 10, b is not more than 45 and not less than 20, c is not more than 25 and not less than 5, andd is not more than 45 and not less than 20. Needed raw materials are pure metal of vanadium, niobium, molybdenum and tantalum. After scales are removed, the raw materials are put in a vacuum arc furnace for smelting; and after 4-6 times of smelting, a solid-solution alloy of a single-phase BCC mechanism can be obtained. The prepared VNbMoTa high-entropy alloy achieves excellent room-temperature plasticity and high-temperature strength, can be on active service at high temperature of 1200 DEG C, and can be widely applied as a high-temperature bearing piece in the fields of aerospace, automobileand oil exploration.

Description

technical field [0001] The invention relates to a high-temperature-resistant VNbMoTa high-entropy alloy and a preparation method thereof, belonging to the field of metal materials and preparation thereof. Background technique [0002] High-entropy alloy refers to a new type of alloy that contains four or more components, the atomic fraction of each component is between 5% and 35%, and can form a simple structure. This kind of alloy has high entropy effect in thermodynamics, lattice distortion effect in structure, hysteretic diffusion effect in kinetics and "cocktail" effect in performance. Compared with traditional alloys containing only one or two components, high-entropy alloys have high strength, high hardness, good wear resistance, high thermal resistance and electrical resistivity, etc., and have broad applications in the fields of structural materials and functional materials. Application prospect. For example: high-strength tool knives, heat-resistant and wear-resis...

Claims

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Application Information

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IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C27/02C22C30/00
Inventor 李云凯陈义文程兴旺薛云飞徐子祁
Owner BEIJING INSTITUTE OF TECHNOLOGYGY