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A low-density, high-strength, high-plasticity high-entropy alloy material and preparation method thereof

A high-entropy alloy, high-strength technology, applied in the field of metal materials, can solve the problems of large difference in composition, poor compactness of sintered alloy, difficult to handle, etc., and achieve the effect of high plasticity, high strength and plasticity

Active Publication Date: 2021-08-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in the melting point of the elements of low-density high-entropy alloys, the chemical composition of the prepared material will be greatly different from the theoretical composition by using traditional smelting methods; currently, most low-density high-entropy alloys are prepared by mechanical alloying , but mechanical alloying has disadvantages such as complex alloying process, poor compactness of sintered alloy, and difficulty in handling special metals (Mg, Ti).
Therefore, the preparation process of low-density high-entropy alloys is not yet perfect.

Method used

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  • A low-density, high-strength, high-plasticity high-entropy alloy material and preparation method thereof
  • A low-density, high-strength, high-plasticity high-entropy alloy material and preparation method thereof
  • A low-density, high-strength, high-plasticity high-entropy alloy material and preparation method thereof

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preparation example Construction

[0038] The embodiment of the present invention provides a Ti a V b Zr c Nb d x e A design and preparation method of a series of high-entropy alloy materials, including the following processes:

[0039] 1. Composition design

[0040] First, in order to obtain refractory high-entropy alloy materials with low density and high plasticity, we select low-density refractory alloy elements with intrinsic plasticity, including titanium (ρ Ti =4.54g / cm 3 ), vanadium (ρ V =6.11g / cm 3 ), zirconium (ρ Zr =6.50g / cm 3 ) and niobium (ρ Nb =8.57g / cm 3 )element. Secondly, in order to further reduce the alloy density, we choose chromium with lower density (ρ Cr =7.22g / cm 3 ) elements and ultra-light aluminum (ρ Al =2.70g / cm 3 ) element to replace the niobium element in the alloy. Finally, in order to ensure the formation of a single-phase solid solution structure after alloying and avoid the generation of intermetallic compounds that damage the properties of the alloy, we have c...

Embodiment 1

[0059] The embodiment of the present invention provides a Ti 40 V 20 Zr 20 Nb 20 High-entropy alloys are composed of four elements: Ti, V, Zr and Nb. The relative atomic percentage of Ti atoms is 40%, the relative atomic percentage of V atoms is 20%, and the relative atomic percentage of Zr atoms is 20%. The relative atomic percentage of Nb atoms is 20%.

[0060] The Ti 40 V 20 Zr 20 Nb 20 The purity of the metal element raw materials selected for the high-entropy alloy is higher than 99.95 at%.

[0061] The Ti 40 V 20 Zr 20 Nb 20 The preparation method of high entropy alloy is as follows:

[0062] Step 1: Select four metal elements Ti, V, Zr, and Nb, and clean the high-purity metal particles twice with an ultrasonic cleaner for 2 minutes each time; 40 V 20 Zr 20 Nb 20 The atomic percentage of high-entropy alloys is accurately weighed four metal elements such as Ti, V, Zr, and Nb; the copper crucible of the vacuum arc melting furnace is polished with sandpaper ...

Embodiment 2

[0069] The embodiment of the present invention provides a Ti 40 V 20 Zr20 Nb 10 Cr 10 High-entropy alloys are composed of five metal elements: Ti, V, Zr, Nb and Cr. The relative atomic percentage of Ti atoms is 40%, the relative atomic percentage of V atoms is 20%, and the relative atomic percentage of Zr atoms is 20%, the relative atomic percentage of Nb atoms is 10%, and the relative atomic percentage of Cr atoms is 10%.

[0070] The Ti 40 V 20 Zr 20 Nb 10 Cr 10 The purity of the metal element raw materials selected for the high-entropy alloy is higher than 99.95 at%.

[0071] The Ti 40 V 20 Zr 20 Nb 10 Cr 10 The preparation method of high entropy alloy is as follows:

[0072] Step 1: Select five metal elements of Ti, V, Zr, Nb and Cr, and clean the high-purity metal particles twice with an ultrasonic cleaner for 2 minutes each time; 40 V 20 Zr 20 Nb 10 Cr 10 The atomic percentage of high-entropy alloys is accurately weighed five metal elements Ti, V, Zr, ...

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Abstract

The invention discloses a low-density, high-strength, high-plasticity high-entropy alloy material and a preparation method thereof. The composition of the high-entropy alloy material is Ti a V b Zr c Nb d x e , wherein, a=35-45at%, b=15-25at%, c=15-25at%, d=15-25at%, e=0-10at%, X is one of Cr, Al and Mo; The preparation method comprises: putting each metal raw material into a water-cooled metal crucible in order of melting point from low to high according to the distribution ratio of the components, placing titanium sponge on the middle copper mold, and smelting the metal raw material by arc ignition in an oxygen-free environment. until fully mixed. The high-entropy alloy materials provided by the present invention all contain BCC structure in structure, and the density of the alloy can be adjusted by adjusting the ratio of metal elements of different densities and adding ultra-light metal element Al; at the same time, it has both high strength and high mechanical properties. Plasticity, has great application potential.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-entropy alloy material with low density, high strength and high plasticity and a preparation method thereof. Background technique [0002] For thousands of years, the traditional alloy system developed is based on one or two components, and the performance of the alloy is improved by adding other trace elements, so as to meet the needs of production and life, such as traditional iron-based, copper-based and Aluminum-based alloys, etc. However, in traditional single principal element alloys, with the addition of other trace elements, intermetallic compounds will be formed, which will reduce the performance of alloy materials and greatly limit the application of traditional alloys; moreover, the selection of elements in traditional alloy systems and Design categories have tended to be saturated, and traditional alloys cannot meet special requirements. [0003] It is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02
CPCC22C1/02C22C30/00
Inventor 毛圣成安子冰韩晓东张泽
Owner BEIJING UNIV OF TECH
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