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Refractory Al-Cr-Ti-V-Nb light high-entropy alloy and preparation method thereof

An al-cr-ti-v-nb, high-entropy alloy technology, applied in the field of alloys, can solve the problems of high density of refractory high-entropy alloys, which cannot be further satisfied.

Pending Publication Date: 2022-04-15
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, at present, the use temperature of traditional superalloys such as Ni-based alloys has reached a bottleneck, so people are inspired by high-entropy alloys
Further studies have been carried out on refractory high-entropy alloys, but the density of refractory high-entropy alloys prepared so far is generally higher
Unable to further satisfy some aerospace, energy and transportation fields that require lightweight materials

Method used

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  • Refractory Al-Cr-Ti-V-Nb light high-entropy alloy and preparation method thereof
  • Refractory Al-Cr-Ti-V-Nb light high-entropy alloy and preparation method thereof
  • Refractory Al-Cr-Ti-V-Nb light high-entropy alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] In the high-hardness Al-Cr-Ti-V-Nb lightweight high-entropy alloy in this example, the atomic percentages of each element are as follows: Al 24%, Cr 24%, Ti 24%, V 23%, and Nb 5%, expressed as Al 24 Cr 24 Ti 24 V 23 Nb 5 Lightweight high-entropy alloys.

[0031] Al above 24 Cr 24 Ti 24 V 23 Nb 5 The preparation method of lightweight high-entropy alloy is as follows:

[0032] (1) Prepare and weigh the metal raw materials Al, Cr, Ti, V, Nb and metal titanium blocks according to the proportioning ratio, and remove impurities and oxides on the raw materials and metal titanium blocks with sandpaper to remove the surface, and the purity of each metal raw material is uniform. If it is higher than 99.9wt%, use acetone as the cleaning solvent after polishing, perform vibration cleaning for 5 minutes in an ultrasonic cleaning machine with a power of 180W and a frequency of 40KHz, and then dry.

[0033] (2) In a non-consumable vacuum arc melting furnace, the metal titani...

Embodiment 2

[0036] In the high-hardness Al-Cr-Ti-V-Nb lightweight high-entropy alloy in this example, the atomic percentages of each element are as follows: Al 23%, Cr 23%, Ti 23%, V 22%, and Nb 9%, expressed as Al 23 Cr 23 Ti 23 V 22 Nb 9 Lightweight high-entropy alloys.

[0037] Al above 23 Cr 23 Ti 23 V 22 Nb 9 The preparation method of lightweight high-entropy alloy is as follows:

[0038] (1) prepare described metal raw material Al, Cr, Ti, V, Nb and metal titanium block according to proportioning, to raw material and metal titanium block use sandpaper to remove surface impurity and oxide, the purity of each metal raw material is all higher than 99.9 wt%, after polishing, use acetone as the cleaning solvent, perform vibration cleaning for 5 minutes in an ultrasonic cleaning machine with a power of 180W and a frequency of 40KHz, and dry.

[0039] (2) In a non-consumable vacuum arc melting furnace, the metal titanium block is first melted under the protection of argon, and th...

Embodiment 3

[0042] In the high-hardness Al-Cr-Ti-V-Nb lightweight high-entropy alloy in this example, the atomic percentages of each element are as follows: Al22%, Cr 22%, Ti 22%, V 22%, and Nb 12%, expressed as Al 22 Cr 22 Ti 22 V 22 Nb 12 Lightweight high-entropy alloys.

[0043] Al above 22 Cr 22 Ti 22 V 22 Nb 12 The preparation method of lightweight high-entropy alloy is as follows:

[0044] (1) Prepare the metal raw materials Al, Cr, Ti, V, Nb and metal titanium blocks according to the proportioning, and remove impurities and oxides on the raw materials and metal titanium blocks with sandpaper, and the purity of each metal raw material is higher than 99.9 wt%, after polishing, use acetone as the cleaning solvent, perform vibration cleaning for 5 minutes in an ultrasonic cleaning machine with a power of 180W and a frequency of 40KHz, and dry.

[0045] (2) In a non-consumable vacuum arc melting furnace, the metal titanium block is first melted under the protection of argon, a...

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Abstract

The invention provides a refractory Al-Cr-Ti-V-Nb light high-entropy alloy and a preparation method thereof, and belongs to the field of metal materials and preparation. The refractory light-weight high-entropy alloy mainly comprises the following elements in percentage by atom: 22 to 25 percent of Al, 22 to 25 percent of Cr, 22 to 25 percent of Ti, 22 to 25 percent of V and 0 to 12 percent of Nb. And performing vacuum arc melting and direct casting to obtain an alloy ingot. According to the refractory high-entropy alloy, the components of the alloy are uniform, segregation and precipitation phases are avoided, the alloy is of a single BCC phase structure and shows high hardness, the hardness is 540 HV or above, the density is about 5.24 g / cm < 3 >-5.52 g / cm < 3 >, and compared with a traditional refractory high-entropy alloy, the refractory high-entropy alloy has the lower density. The alloy is subjected to homogenizing annealing, and the annealed alloy shows a typical amplitude-modulated decomposition structure of the refractory high-entropy alloy. The hardness is also improved, and the highest hardness can reach 631 HV. The preparation method has the advantages of no pollution, low energy consumption and low cost.

Description

technical field [0001] The invention belongs to the technical field of alloys, and in particular relates to a refractory Al-Cr-Ti-V-Nb lightweight high-entropy alloy and a preparation method thereof. Background technique [0002] High-entropy alloy is a new type of alloy proposed by Professor Ye Junwei in 2004. That is, an alloy composed of five or more elements, the atomic percentage of each element is between 5% and 35%. This new alloy concept breaks the bottleneck of alloy performance improvement. And showed excellent comprehensive properties, such as high strength, high hardness, good high temperature resistance, corrosion resistance, wear resistance and so on. It can be applied to high-speed cutting tools, turbine blades, wear-resistant coatings, etc. [0003] But at present, the use temperature of traditional superalloys such as Ni-based alloys has reached a bottleneck, so people are inspired by high-entropy alloys. Further studies have been carried out on refracto...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C30/00C22B9/20C22F1/00
CPCC22C1/02C22C30/00C22B9/20C22F1/00
Inventor 彭振范子泽骆再斌
Owner JIANGSU UNIV
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