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High-hardness Al-Cr-Ti-V-Cu light high-entropy alloy and preparation method thereof

An al-cr-ti-v-cu, high-entropy alloy technology, applied in the field of alloys, can solve the problems of limited application and large room temperature brittleness, and achieve the effects of good thermal stability, increased hardness and high hardness

Active Publication Date: 2021-11-09
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the lightweight high-entropy alloys exhibit BCC phase and multi-phase structure, so they are brittle at room temperature, which limits their further applications.

Method used

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  • High-hardness Al-Cr-Ti-V-Cu light high-entropy alloy and preparation method thereof
  • High-hardness Al-Cr-Ti-V-Cu light high-entropy alloy and preparation method thereof
  • High-hardness Al-Cr-Ti-V-Cu light high-entropy alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In the high hardness Al-Cr-Ti-V-Cu lightweight high-entropy alloy in this embodiment, the atomic percentages of each element are as follows: Al24%, Cr 24%, Ti 23%, V 23%, Cu 6%, expressed as Al 24 Cr 24 Ti 23 V 23 Cu 6 Lightweight high-entropy alloys.

[0031] Al above 24 Cr 24 Ti 23 V 23 Cu 6 The preparation method of lightweight high-entropy alloy is as follows:

[0032] (1) Prepare the metal raw materials Al, Cr, Ti, V, Cu and metal titanium blocks according to the proportioning, and remove impurities and oxides on the surface by sanding the raw materials and metal titanium blocks, 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.

[0033] (2) In a non-consumable vacuum arc melting furnace, the metal titanium block is first melted under the protection of argo...

Embodiment 2

[0036] In the high-hardness Al-Cr-Ti-V-Cu lightweight high-entropy alloy in this example, the atomic percentages of each element are as follows: Al 21%, Cr 21%, Ti 22%, V 23%, Cu 13%, expressed as Al 21 Cr 21 Ti 22 V 23 Cu 13 Lightweight high-entropy alloys.

[0037] Al above 21 Cr 21 Ti 22 V 23 Cu 13 The preparation method of lightweight high-entropy alloy is as follows:

[0038] (1) Prepare the metal raw materials Al, Cr, Ti, V, Cu and metal titanium blocks according to the proportioning, and remove impurities and oxides on the surface by sanding the raw materials and metal titanium blocks, 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.

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

Embodiment 3

[0042] In the high-hardness Al-Cr-Ti-V-Cu lightweight high-entropy alloy in this example, the atomic percentages of each element are as follows: Al21%, Cr 20%, Ti 21%, V 20%, Cu 18%, expressed as Al 21 Cr 20 Ti 21 V 20 Cu 18 Lightweight high-entropy alloys.

[0043] Al above 21 Cr 20 Ti 21 V 20 Cu 18 The preparation method of lightweight high-entropy alloy is as follows:

[0044] (1) Prepare the metal raw materials Al, Cr, Ti, V, Cu and metal titanium blocks according to the proportioning, and remove impurities and oxides on the surface by sanding the raw materials and metal titanium blocks, 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 argo...

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Abstract

The invention provides a high-hardness Al-Cr-Ti-V-Cu light high-entropy alloy and a preparation method thereof, and belongs to the field of metal materials and preparation. The high-entropy alloy mainly comprises the following components in percentage by atoms: 20 to 25 percent of Al, 20 to 25 percent of Cr, 20 to 25 percent of Ti, 20 to 25 percent of V and 0 to 20 percent of Cu, wherein the content of Cu is not 0. The phase structure of the alloy is mainly characterized in that a single-phase structure is gradually converted into a multi-phase structure, a single BCC phase structure is mainly and gradually converted into a BCC+FCC phase and a small amount of HCP phase structure, and finally the structure is converted into an FCC+HCP phase structure. The high hardness of 650 HV or above and good thermal stability are shown. The invention further provides a preparation method of the Al-Cr-Ti-V-Cu high-entropy alloy. Vacuum arc melting and direct casting are performed to obtain an alloy ingot; and the preparation process is pollution-free, low in energy consumption and low in cost.

Description

technical field [0001] The invention relates to the technical field of alloys, in particular to a high-hardness Al-Cr-Ti-V-Cu lightweight high-entropy alloy and a preparation method thereof. Background technique [0002] Traditional alloys mainly contain one principal element, and a small amount of other elements are added to this principal element. This design philosophy limits alloy performance. Therefore, in order to break this limitation, Professor Ye Junwei and others researched and proposed a new alloy concept. That is, an alloy composed of five or more elements, and the atomic percentage of each element is between 5% and 35%, and it is named high-entropy alloy. High-entropy alloys exhibit excellent properties, such as high strength, high hardness, good high temperature resistance, corrosion resistance, and wear resistance. It can be applied to high-speed cutting tools, turbine blades, wear-resistant coatings, etc. However, in order to further meet the requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C30/02C22C1/02
CPCC22C30/02C22C1/02
Inventor 彭振骆再斌范子泽刘满平
Owner JIANGSU UNIV
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