阅读说明：本技术 非晶增强铝合金复合材料及其制备方法 (Amorphous reinforced aluminum alloy composite material and preparation method thereof ) 是由 宁炜铭 李海超 倪欣 安雯嫣 贾欣茹 范翊 于 2020-05-03 设计创作，主要内容包括：本发明提供了一种非晶增强铝合金复合材料及其制备方法,复合材料包括基体粉末和非晶增强体粉末,其中,基体粉末包括：10.0-13.0wt％锌、1.9-3.0wt％镁、1.2-2.0wt％铜、0.02-0.2wt％钛、0.1-0.3wt％锆、0.1-0.3wt％钪、铁≤0.05wt％、硅≤0.05wt％、81.1-86.5wt％铝,铁的含量大于硅的含量；非晶增强体粉末包括：50-60wt％镍、10-25wt％锆、10-25wt％钛、1-5wt％硅、1-5wt％锡；本发明的复合材料经热挤压后,合金达到完全致密化,其T6态力学性能相比传统粉末冶金超高强铝合金提高20％以上,极大地拓展了该合金的应用前景。(The invention provides an amorphous reinforced aluminum alloy composite material and a preparation method thereof, wherein the composite material comprises matrix powder and amorphous reinforcement powder, wherein the matrix powder comprises: 10.0-13.0 wt% of zinc, 1.9-3.0 wt% of magnesium, 1.2-2.0 wt% of copper, 0.02-0.2 wt% of titanium, 0.1-0.3 wt% of zirconium, 0.1-0.3 wt% of scandium, less than or equal to 0.05 wt% of iron, less than or equal to 0.05 wt% of silicon, 81.1-86.5 wt% of aluminum, wherein the content of iron is more than that of silicon; the amorphous reinforcement powder includes: 50-60 wt% of nickel, 10-25 wt% of zirconium, 10-25 wt% of titanium, 1-5 wt% of silicon and 1-5 wt% of tin; after the composite material is subjected to hot extrusion, the alloy achieves complete densification, the T6 state mechanical property of the alloy is improved by more than 20 percent compared with that of the traditional powder metallurgy ultrahigh-strength aluminum alloy, and the application prospect of the alloy is greatly expanded.)

1. An amorphous reinforced aluminum alloy composite material is characterized in that: the amorphous reinforcement powder comprises matrix powder and amorphous reinforcement powder, wherein the matrix powder comprises the following components:

the content of iron is greater than the content of silicon;

the amorphous reinforcement powder comprises the following components:

2. the amorphous reinforced aluminum alloy composite material as recited in claim 1, wherein: the grain size of the matrix powder is less than 100 mu m, and the grain size of the amorphous reinforcement powder is less than 50 mu m.

3. A method of preparing an amorphous reinforced aluminium alloy composite material according to claim 1 or 2, characterized in that: which comprises the following steps:

(1) performing ball milling and mixing on the matrix powder and the amorphous reinforcement powder to obtain a mixture;

(2) vacuumizing the mixture until the vacuum degree is less than 1 × 10^-4Pa, flushing argon protection, and then sintering to obtain a blank;

(3) and polishing the blank, coating the blank by a pure copper sheath, performing isothermal extrusion, performing bipolar solution treatment, and quenching to obtain the amorphous reinforced aluminum alloy composite material.

4. The production method according to claim 3, characterized in that: in the step (1), the ball milling parameters are as follows: the ball powder ratio is 6:1-10:1, the rotating speed is 100-.

5. The method according to claim 3, wherein the argon gas in the step (2) is 0.5 × 10⁵Pa-1×10⁵Pa; the sintering pressure is 450-550MPa, the sintering temperature is 400-450 ℃, and the sintering time is 30-60 min.

6. The production method according to claim 3, characterized in that: in the step (2), the length of the blank is 15mm, and the diameter of the blank is 10 mm.

7. The production method according to claim 3, characterized in that: in the step (3), the extrusion temperature is 400-430 ℃, the extrusion ratio is 10:1, and the moving speed of the punch is 0.05-0.15 mm/s.

8. The production method according to claim 3, characterized in that: in the step (3), the bipolar solution treatment is firstly carried out at 450-465 ℃ for 1h, and then is carried out at 470-490 ℃ for 1 h.

9. The production method according to claim 3, characterized in that: in the step (3), the transfer time of quenching is less than or equal to 15s, the quenching temperature is 25-35 ℃, and the adopted aging system is single-stage aging: keeping the temperature at 120 ℃ for 16-20 h.

Technical Field

The invention belongs to the technical field of composite materials, and particularly relates to an amorphous reinforced aluminum alloy composite material and a preparation method thereof.

Background

Al-Zn-Mg-Cu series (7XXX series) alloys are the most advantageous structural materials in the aerospace industry, and the heat treatment standards of the corresponding alloys are also classified. In the development process of a novel Al-Zn-Mg-Cu aluminum alloy product, the fact that the content of main alloying elements has an obvious upper limit is found, even if the novel Al-Zn-Mg-Cu aluminum alloy product is prepared by a rapid solidification method, the mechanical property of the alloy is difficult to break through a bottleneck, the reason is that the alloying content is too high, a second phase cannot be completely dissolved back in a solid solution temperature range, the number of precipitated phases in the subsequent aging process is reduced, the alloy strength is reduced, and the residual second phase can further damage the plasticity of the alloy.

Disclosure of Invention

Aiming at the defects in the prior art, the invention mainly aims to provide an amorphous reinforced aluminum alloy composite material.

The second purpose of the invention is to provide a preparation method of the composite material. Namely, the amorphous reinforced ultrahigh-strength aluminum alloy composite material is prepared by adopting a powder metallurgy method, and the relationship between the content of the reinforcement and the mechanical property is established as follows: with the increase of the content of the reinforcement, the mechanical property is obviously improved, the purpose of optimizing the mechanical property of the alloy is realized through the reinforcement-matrix composite reinforcement effect, and then the aluminum alloy composite material with ultrahigh performance is developed, which has important significance for the development of the industry in China.

In order to achieve the above-mentioned primary object, the solution of the present invention is:

an amorphous reinforced aluminum alloy composite material comprises matrix powder and amorphous reinforcement powder, wherein the matrix powder comprises the following components:

the content of iron is greater than the content of silicon;

the amorphous reinforcement powder comprises the following components:

preferably, the particle size of the matrix powder is < 100 μm and the particle size of the amorphous reinforcement powder is < 50 μm.

To achieve the second object, the solution of the invention is:

the preparation method of the amorphous reinforced aluminum alloy composite material comprises the following steps:

(1) performing ball milling and mixing on the matrix powder and the amorphous reinforcement powder to obtain a mixture;

(2) vacuumizing the mixture until the vacuum degree is less than 1 × 10^-4Pa, flushing argon protection, and then sintering to obtain a blank;

(3) and polishing the blank, coating the blank by a pure copper sheath, performing isothermal extrusion, performing bipolar solution treatment, and quenching to obtain the amorphous reinforced aluminum alloy composite material.

Preferably, in the step (1), the parameters of ball milling are as follows: the ball powder ratio is 6:1-10:1, the rotating speed is 100-.

Preferably, in step (2), the argon gas is 0.5 × 10⁵Pa-1×10⁵Pa; the sintering pressure is 450-550MPa, the sintering temperature is 400-450 ℃, and the sintering time is 30-60 min.

Preferably, in step (2), the blank is a cylinder with a length of 15mm and a diameter of 10 mm.

Preferably, in the step (3), the extrusion temperature is 400-430 ℃, the extrusion ratio is 10:1, and the moving speed of the punch is 0.05-0.15 mm/s.

Preferably, in the step (3), the bipolar solution treatment is firstly performed at 450-.

Preferably, in the step (3), the transfer time of quenching is less than or equal to 15s, the quenching temperature is 25-35 ℃, and the adopted aging system is single-stage aging: keeping the temperature at 120 ℃ for 16-20 h.

Due to the adoption of the scheme, the invention has the beneficial effects that:

firstly, the invention adopts the amorphous reinforcement with excellent mechanical property (Hv is more than 500) and combines the powder metallurgy technology, thereby breaking through the limitation of the traditional alloy components, obtaining equiaxial fine alloy structure with uniformly distributed reinforcement, and the average grain size is less than 40 μm.

Secondly, after the blank is subjected to hot extrusion, the alloy achieves complete densification, then T6 heat treatment is carried out, and the performance of the alloy is compared with that of the alloy which does not contain a reinforcement and has the same component and the same state, through tests, the T6 state mechanical property of the composite material is improved by more than 20% compared with that of the traditional powder metallurgy ultrahigh-strength aluminum alloy, and the application prospect of the alloy is greatly expanded.

Drawings

FIG. 1 is a schematic scanning view of the amorphous reinforced aluminum alloy composite material of the present invention.

Detailed Description

The invention provides an amorphous reinforced aluminum alloy composite material and a preparation method thereof.

< amorphous reinforced aluminum alloy composite >

The amorphous reinforced aluminum alloy composite material comprises matrix powder and amorphous reinforced body powder, wherein the matrix powder comprises the following components:

the content of Fe is larger than that of Si, and Al is a balance element.

The amorphous reinforcement powder comprises the following components:

wherein, the grain diameter of the matrix powder is less than 100 μm, and the grain diameter of the amorphous reinforcement powder is less than 50 μm.

< preparation method of amorphous reinforced aluminum alloy composite >

The preparation method of the amorphous reinforced aluminum alloy composite material comprises the following steps:

(1) ball-milling and mixing powder: in order to ensure that the powder is not polluted, all the premixed powder is operated in a glove box, namely, matrix powder and 5-30 vol% of amorphous reinforcement powder are added into a ball milling tank, and then the ball milling tank is hermetically arranged in a ball mill for ball milling and mixing to obtain a mixture;

(2) powder hot pressing sintering, namely sealing the equipment after charging (namely mixture), and vacuumizing the mixture until the vacuum degree is less than 1 × 10^-4Pa, flushing argon protection, and then sintering to obtain a blank;

(3) and (3) extrusion densification: polishing the sintered blank to remove surface defects, and performing isothermal extrusion after coating by adopting a pure copper sheath with the thickness of 1 mm;

(4) and a heat treatment system: and carrying out bipolar solution treatment and quenching to obtain the amorphous reinforced aluminum alloy composite material.

Wherein, in the step (1), the ball milling parameters are as follows: the ball powder ratio is 6:1-10:1, the rotating speed is 100-.

In step (2), the argon gas was 0.5 × 10⁵Pa-1×10⁵Pa; the sintering pressure is 450-550MPa, the sintering temperature is 400-450 ℃, and the sintering time is 30-60 min.

In step (2), the billet has a length of 15mm and a diameter of 10 mm.

In the step (3), the extrusion temperature is 400-430 ℃, the extrusion ratio is 10:1, and the moving speed of the punch is 0.05-0.15 mm/s.

In the step (3), the bipolar solution treatment is firstly carried out at 450-.

In the step (3), the transfer time of quenching is less than or equal to 15s, the quenching temperature is 25-35 ℃, and the adopted aging system is single-stage aging: keeping the temperature at 120 ℃ for 16-20 h.

The present invention will be further described with reference to the following examples.