High-entropy alloy reinforced 2024 aluminum based composite material and preparation method thereof

A technology of aluminum matrix composite materials and high entropy alloys, which is applied in the field of aluminum matrix composite materials and can solve problems such as poor wettability

Inactive Publication Date: 2019-02-15
XIAN TECHNOLOGICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-entropy alloy reinforced 2024 aluminum-based composite material and its preparation method to solve the problem of poor wettability between the second reinforcing particle of the composite material and the matrix metal, and improve the mechanical properties of the matrix metal at the same time

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  • High-entropy alloy reinforced 2024 aluminum based composite material and preparation method thereof

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preparation example Construction

[0027] The invention also discloses a method for preparing a high-entropy alloy reinforced 2024 aluminum-based composite material, which can successfully prepare Al x CoCrFeNi high-entropy alloy reinforced 2024 aluminum matrix composite material, using 2024 aluminum alloy powder and high-entropy alloy powder as raw materials, the implementation steps are: according to the design volume fraction, take Al x CoCrFeNi particles and 2024 aluminum alloy powder; mixed powder by ball milling; the resulting mixed powder is put into a mold for pre-pressing; after pre-pressing, it is placed in a spark plasma sintering equipment for sintering, and after cooling with the furnace, a high-entropy alloy reinforced 2024 aluminum matrix composite material is obtained. The invention has simple preparation process, short production period, controllable size and content of second-phase reinforced particles, and can produce composite material with high density and excellent performance with relative...

Embodiment 1

[0039] Such as figure 1 As shown, the selected crystal structure is Al with an FCC particle size of 80 μm 0.2 CoCrFeNi high-entropy alloy powder is mixed with 2024 aluminum alloy powder in a ball mill according to the volume fraction of 5vol%, and the grinding ball is agate ball, the rotating speed is 180r / min, the ball-to-material ratio is 5:1, and the ball-milling time is 6h. figure 2 Mixed powders shown. Put the mixed powder into a graphite mold for SPS sintering. The sintering pressure is 30MPa, the heating rate is 100°C / min, the sintering temperature is 500°C, and the heat preservation is 5 minutes. After the heat preservation time is over, the sintering is stopped. When the temperature cools to room temperature, the pressure is released. Take out the mold for demoulding to get dense 5vol% Al 0.2 FeCrCoNi / 2024 aluminum matrix composite block.

Embodiment 2

[0041] Select Al with a crystal structure of FCC+BCC and a particle size of 80 μm 0.6 CoCrFeNi high-entropy alloy powder is mixed with 2024 aluminum alloy powder in a ball mill according to the volume fraction of 10vol%, using a stainless steel ball mill pot, the ball is agate ball, the speed is 250r / min, the ball-to-material ratio is 5:1, and the ball milling time is 6h. Put the mixed powder into a graphite mold for SPS sintering. The initial sintering pressure is 20MPa, the heating rate is 100°C / min to 500°C, and then the heating rate is 20°C / min to 540°C, and the temperature is kept for 5 minutes. After the holding time is over, the sintering is stopped. When the temperature is cooled to room temperature, the pressure is released, the mold is taken out for demoulding, and a dense 10vol% Al is obtained 0.6 FeCrCoNi / 2024 aluminum matrix composite block. Such as image 3 As shown, the SEM image of the high-entropy alloy reinforced 2024 aluminum matrix composite block prepare...

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Abstract

The invention discloses a high-entropy alloy reinforced 2024 aluminum based composite material. The high-entropy alloy reinforced 2024 aluminum based composite material is prepared from AlxCoCrFeNi high-entropy alloy and a 2024 aluminum substrate, wherein the volume fraction of the AlxCoCrFeNi high-entropy alloy is 5 to 20 vol%, the rest is the 2024 aluminum substrate, and the atomic ratio of Al,Co, Cr, Fe and Ni elements in the AlxCoCrFeNi high-entropy alloy is (0.2 to 1):1:1:1:1. According to the high-entropy alloy reinforced 2024 aluminum based composite material, the problem of poor wettability of an existing ceramic reinforced metal matrix composite material is solved, and additionally, the application of the aluminum based composite material in the techniques of aviation, space, electronics, communication and the like and in the industries of machinery, chemical engineering, energy and the like can be promoted through multiple excellent effects and performance of high-entropy alloy.

Description

【Technical field】 [0001] The invention belongs to the field of aluminum-based composite materials, and in particular relates to a high-entropy alloy-reinforced 2024 aluminum-based composite material and a preparation method thereof. 【Background technique】 [0002] Nowadays, with the development of aviation, aerospace, electronics, communication and other technologies as well as machinery, chemical industry, energy and other industries, people have higher and higher requirements for the performance of materials. Metal matrix composites (MMC) are composite materials that use pure metal or alloy as the matrix, and the properties of the original matrix are changed by adding reinforcements. Generally speaking, the commonly used substrates of aluminum matrix composites include Al-Si, Al-Cu and other systems, and the reinforcements mainly include SiC particles, BC 4 particles, TiC particles, etc. [0003] However, although the ceramic reinforced phase has the advantages of low de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C1/04B22F3/105
CPCB22F3/1007B22F3/105B22F2999/00C22C1/0416C22C21/00B22F2201/11
Inventor 陈建刘赟姿杨巍李钊梁家铧
Owner XIAN TECHNOLOGICAL UNIV
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