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A kind of high-entropy alloy particle reinforced aluminum matrix composite material and its preparation method

A particle-reinforced aluminum and high-entropy alloy technology, which is applied in the field of composite material preparation, can solve the problems of self-brittleness and sintering temperature limitation, affecting material densification, and difficulty in realizing composite material strength and plasticity, and achieves low energy consumption and cost. Easy-to-achieve, simple-to-craft effects

Inactive Publication Date: 2016-09-07
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a high-entropy alloy particle-reinforced aluminum-based composite material, and at the same time provides its preparation method, which solves the problem of self-brittleness and the limitation of sintering temperature in the existing particle-reinforced aluminum-based composite material, which affects the densification of the material. , it is difficult to improve the strength and plasticity of composite materials at the same time

Method used

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  • A kind of high-entropy alloy particle reinforced aluminum matrix composite material and its preparation method
  • A kind of high-entropy alloy particle reinforced aluminum matrix composite material and its preparation method
  • A kind of high-entropy alloy particle reinforced aluminum matrix composite material and its preparation method

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Embodiment 1

[0034] Embodiment 1: including the step of preparing high-entropy alloy ingot, the step of preparing high-entropy alloy powder, the step of preparing composite powder and the step of sintering molding:

[0035] (1) Steps for preparing high-entropy alloy ingots:

[0036] Weigh the corresponding masses of aluminum, cobalt, chromium, iron, nickel, and titanium sponge according to the atomic ratio Al:Co:Cr:Fe:Ni:Ti=1:1:1:1:1:0.5, and place them in a vacuum non- In the water-cooled copper crucible in the consumable electrode electric arc furnace, the melting is carried out in a vacuum environment, and the protection of Ar gas is introduced, and the melting is repeated 3 times to prevent composition segregation, and a high-entropy alloy ingot with uniform composition is obtained;

[0037] The purity of each raw material is not less than 99.5wt.%. When placed in a water-cooled copper crucible, each raw material is placed from bottom to top according to its melting point from low to h...

Embodiment 2

[0050] The difference with embodiment 1 is: repeated smelting 5 times in the step (1); Ball milling process parameters in the step (2): the ball-to-material ratio is 15:1, and the rotating speed is adjusted to 200r / min, and the ball milling time is adjusted to 1h; the step ( 3) The volume ratio of high-entropy alloy powder particles and aluminum powder is 1:4, and the ball milling process parameters are: the mass ratio of balls to materials is 10:1, the speed is adjusted to 100r / min, and the ball milling time is adjusted to 3h; discharge in step (4) The plasma process parameters are adjusted as follows: sintering temperature is 550°C, holding time is 6min, pressure is 50MPa during sintering, heating rate is 100°C / min, vacuum degree -3 Pa.

[0051] The AlCoCrFeNiTi that embodiment 2 makes 0.5 The backscattering (SSD) spectrum of high-entropy alloy reinforced aluminum matrix composites is as follows: image 3 shown. The bright area in the figure is the high-entropy alloy reinf...

Embodiment 3

[0053] The difference with Example 1 is: in step (4), the hot pressing sintering process is adopted for sintering, the sintering temperature is 550°C, the holding time is 1h, the applied pressure is 400MPa during sintering, and the vacuum degree-3 Pa.

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Abstract

The invention discloses a high-entropy alloy particle-reinforced aluminum-based composite material and a preparation method thereof, and belongs to the field of preparation of composite materials. The problems of influence on material densification and difficulty in the simultaneous improvement of strength and plasticity of the composite material due to own brittleness of a conventional metal-based reinforcement phase and limitation to sintering temperature are solved. The aluminum-based composite material is formed by the ball-milling mixing and sintering forming of a matrix phase and a reinforcement phase, wherein the volume ratio of the matrix phase aluminum and the reinforcement phase high-entropy alloy particles AlCoCrFeNiTi0.5 is 1: 4 to 1: 9. The preparation method for the high-entropy alloy particle-reinforced aluminum-based composite material comprises a step of preparing a high-entropy alloy ingot, a step of preparing high-entropy alloy powder, a step of preparing composite powder and a sintering forming step. According to the high-entropy alloy particle-reinforced aluminum-based composite material and the preparation method thereof, a process is simple, lower in energy consumption and cost and easy to implement, the tensile strength of the prepared high-entropy alloy particle-reinforced aluminum-based composite material is strengthened by 32.4 to 90.1 percent, the elongation of the high-entropy alloy particle-reinforced aluminum-based composite material is improved by 29.6 to 52.0 percent, and the comprehensive performance of the aluminum-based composite material is improved.

Description

technical field [0001] The invention belongs to the field of composite material preparation, and relates to a preparation method of a particle-reinforced aluminum-based composite material, in particular to a high-entropy alloy particle-reinforced aluminum-based composite material and a preparation method thereof. Background technique [0002] Particle-reinforced aluminum matrix composites are heterogeneous mixtures of metal aluminum and its alloys as the matrix, and metal or non-metal particles as the reinforcing phase. Particle-reinforced aluminum matrix composites have become the research focus of aluminum matrix composites due to their excellent high-temperature mechanical properties, wear resistance, low thermal expansion coefficient, simple preparation process, low reinforcement cost, and easy industrialized mass production. Its products have been widely used in aerospace, military, automobile, electronics, sports and other fields. [0003] The key to the excellent per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C21/00
Inventor 刘鑫旺孙锐刘富初樊自田
Owner HUAZHONG UNIV OF SCI & TECH