CN112831680B - Superhard multi-component boride particle reinforced aluminum matrix composite material and preparation method thereof - Google Patents

Superhard multi-component boride particle reinforced aluminum matrix composite material and preparation method thereof Download PDF

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CN112831680B
CN112831680B CN202011629777.6A CN202011629777A CN112831680B CN 112831680 B CN112831680 B CN 112831680B CN 202011629777 A CN202011629777 A CN 202011629777A CN 112831680 B CN112831680 B CN 112831680B
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聂金凤
范勇
陈翔
郝肖杰
伍玉立
赵永好
李玉胜
曹阳
周浩
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Nanjing University of Science and Technology
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Abstract

The invention discloses superhard multicomponent boronA compound particle reinforced aluminum matrix composite material and a preparation method thereof. The method comprises the following steps: (1): weighing the following raw materials: weighing industrial pure aluminum, Hf, Ta, Zr, Nb and Ti simple substance blocks and aluminum-boron binary intermediate alloy according to the proportion; (2): smelting: putting the weighed industrial pure aluminum and the simple substance blocks of Hf, Ta, Zr, Nb and Ti into a water-cooled copper crucible of a vacuum arc furnace according to the sequence of melting points from low to high, and smelting to obtain an aluminum alloy ingot; placing an aluminum alloy ingot and an aluminum-boron binary intermediate alloy into the same crucible, and smelting to obtain (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material. The method adopts a vacuum arc melting mode, and utilizes the in-situ chemical reaction between transition metal particles at high temperature and boron in an aluminum melt to form multi-boride particles; in addition, the method has the flexibility of microstructure and component design, and can quickly prepare a series of transition group metal multi-boride particle reinforced aluminum matrix composite materials with different components.

Description

Superhard multi-component boride particle reinforced aluminum matrix composite material and preparation method thereof
Technical Field
The invention belongs to the field of metal matrix composite materials, and particularly relates to a superhard multi-boride particle reinforced aluminum matrix composite material and a preparation method thereof.
Background
The particle reinforced aluminum matrix composite has the performance advantages of low density, high specific strength, good size stability and the like, and is widely applied in the fields of aerospace, automobile engines and the like. Eyes of a userPreviously, the reinforcing phase particles usually employed were predominantly single-component carbides, borides and nitrides, e.g. SiC, TiB2、TiC、Al3BC. AlN and the like.
However, with the increasing requirements of service performance and the like, the conventional single-component compound is gradually difficult to meet the service requirements in the aspects of hardness, oxidation resistance and the like, and therefore, the development of a novel reinforcing phase is urgent. Compared with the traditional enhancement, the boride with multiple elements has better mechanical property than single metal boride due to the high entropy effect and the lattice distortion effect of the boride. Hf (Hf) is synthesized at 2000 ℃ and 30MPa pressure by using transition Metal boride powder as raw material and adopting High energy ball milling combined with spark plasma sintering process as reported in "High-enhancement Metal diodes" 2016,6 "published by Gild et al0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Six kinds of high-entropy boride ceramics with single solid solution structures are adopted. The hardness and oxidation resistance of these high entropy metal borides are generally higher than the average performance of five individual metal borides prepared using the same manufacturing process. Although the density of the synthesized high-entropy boride ceramic is only 92.4 percent, the hardness reaches 17.5 GPa-23.7 GPa, and the high-entropy boride ceramic has ultrahigh hardness. However, the raw material powder needs to be mechanically alloyed by a high-energy ball milling method before spark plasma sintering, so that the defects of long preparation period, high energy consumption and the like exist. Meanwhile, oxide impurities are inevitably introduced in the sintering process, which causes the sintering densification of the high-entropy boride ceramic to be difficult and the density to be low.
Disclosure of Invention
The invention aims to provide a superhard multi-boride particle reinforced aluminum matrix composite material and a preparation method thereof.
The technical solution for realizing the purpose of the invention is as follows: a preparation method of an ultrahard multi-boride particle reinforced aluminum matrix composite material comprises the following steps:
step (1): weighing the following raw materials: weighing industrial pure aluminum, Hf, Ta, Zr, Nb and Ti simple substance blocks and aluminum-boron binary intermediate alloy according to the proportion;
step (2): smelting: putting the weighed industrial pure aluminum and the simple substance blocks of Hf, Ta, Zr, Nb and Ti into a water-cooled copper crucible of a vacuum arc furnace according to the sequence of melting points from low to high, and smelting to obtain an aluminum alloy ingot; placing the obtained aluminum alloy ingot and aluminum-boron binary intermediate alloy in the same crucible, and smelting to obtain (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material.
Further, the mixture ratio of the raw materials in the step (1) is specifically as follows:
8.35-84.15 parts of industrial pure aluminum, 15-66.29 parts of aluminum-boron binary intermediate alloy, and 0.2:0.2:0.2:0.2 of the molar ratio of the high-purity transition metal elements Hf, Ta, Zr, Nb and Ti simple substance blocks, wherein the total mass percentage is 0.85-25.36.
Further, the step (2) specifically comprises the following steps:
step (21): putting the weighed pure aluminum and the simple substance blocks of Hf, Ta, Zr, Nb and Ti into a water-cooled copper crucible of a vacuum arc furnace in sequence from low melting point to high melting point, and putting the pure titanium into the other crucible;
step (22): vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa, starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in a furnace cavity, smelting industrial pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 1-3 min under the current condition of 50-250A during smelting, and then smelting for 1-3 min under the current condition of 250-500A;
step (23): repeatedly overturning and smelting the alloy ingot obtained in the step (22) for 3-5 times to obtain an aluminum alloy ingot with a uniform tissue;
step (24): placing the aluminum alloy ingot obtained in the step (23) and the aluminum-boron binary intermediate alloy into the same crucible, and placing industrial pure titanium into the other crucible; vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa, starting a smelting direct current power switch, and smelting pure Ti blocks to obtain the final productAbsorbing residual oxygen in the furnace cavity, then smelting an aluminum alloy ingot and an aluminum-boron binary intermediate alloy, wherein during smelting, smelting is carried out for 1-3 min under the current condition of 50-250A, and then smelting is carried out for 1-3 min under the current condition of 250A-500A; repeatedly overturning and smelting for 4-8 times to obtain (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material.
An ultrahard multi-boride particle reinforced aluminum matrix composite material is prepared by the method.
Further, in the composite material of (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The grain size of the multi-component boride is 0.5-10 mu m.
Compared with the prior art, the invention has the remarkable advantages that:
(1) the novel reinforcement reinforced aluminum-based composite material prepared by the invention adopts a vacuum arc melting mode, has great microstructure and flexibility of component design, can regulate and control the size of multi-component boride particles in an aluminum matrix by controlling the reaction temperature and time at high temperature, and can also regulate the component content of raw materials according to requirements to prepare a series of transition metal multi-component boride particle reinforced aluminum-based composite materials with different components.
(2) The multi-boride reinforced particles are formed in situ in the aluminum melt, the purity is high, the wettability with the matrix is good, the interface bonding strength is high, the synthesized multi-boride has hardness superior to that of a single boride due to lattice distortion, and simultaneously has higher thermal stability due to a high entropy effect; so that the multi-boride particle reinforced aluminum matrix composite material has good heat resistance and comprehensive mechanical property which is better than that of the conventional single transition metal boride particle reinforced aluminum matrix composite material.
(3) During smelting, pure aluminum and the transition metal simple substance are firstly smelted to obtain an aluminum alloy ingot in which the transition group metal simple substance is dissolved, and then the aluminum alloy ingot and the aluminum boron intermediate alloy are smelted together, so that the full implementation of the in-situ reaction between the transition metal simple substance and the boron element in the aluminum melt is facilitated.
(4) The preparation method is energy-saving and environment-friendly, and the utilization rate of raw materials is high.
Drawings
FIG. 1 is an SEM image of a multi-boride particle reinforced aluminum matrix composite synthesized in example 2.
FIG. 2 is an EDS spectrum of Ti element corresponding to the multi-boride particle-reinforced aluminum-based composite material synthesized in example 2.
FIG. 3 is the EDS spectrum of the corresponding Ta element of the multi-boride particle reinforced aluminum matrix composite synthesized in example 2.
FIG. 4 is the EDS spectrum of the corresponding Hf element in the multi-boride particle reinforced aluminum matrix composite synthesized in example 2.
FIG. 5 is the EDS spectrum of the corresponding Zr element of the multi-boride particle reinforced aluminum matrix composite synthesized in example 2.
FIG. 6 is an EDS spectrum of the corresponding Nb element of the multi-boride particle-reinforced aluminum-based composite material synthesized in example 2.
FIG. 7 is the EDS spectrum of the corresponding B element of the multi-boride particle reinforced aluminum matrix composite synthesized in example 2.
FIG. 8 is a nano-indentation curve of a multi-boride particle reinforced aluminum matrix composite synthesized in example 2.
Detailed Description
The following examples are given for the detailed implementation and specific operation of the present invention, but the scope of the present invention is not limited to the following examples.
Superhard multicomponent (Hf) with excellent comprehensive performance0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The particle reinforced aluminum matrix composite material and the preparation method with simple process, low energy consumption and short preparation period are provided. The invention is realized by the following modes: the method uses industrial pure aluminum as a matrix material, an aluminum-boron binary alloy as a boron source, five simple substances of high-purity Hf, Ta, Zr, Nb and Ti as transition metal sources, and uses boron atoms and transition metals dissolved in an aluminum melt at high temperatureSpontaneous chemical reaction among elements Hf, Ta, Zr, Nb and Ti, so that a large amount of multi-component boride particles are formed in situ in the aluminum alloy melt. The method is characterized in that: formed in situ in an aluminum alloy melt (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The mass percentage of the multi-component boride particles is 1-30, the particle size of the multi-component boride phase is about 0.5-10 μm, and the distribution of each metal element is relatively uniform. The synthesized multi-boride has higher hardness than a single boride due to lattice distortion and also has higher thermal stability due to a high entropy effect. Thereby obtaining a novel boride reinforced aluminum matrix composite material with high hardness, high wear resistance and good heat resistance.
Example 1
Step 1, weighing: preparing the required raw materials in percentage by mass as follows: 84.15 parts of industrial pure aluminum, 15 parts of Al-1B intermediate alloy, and the molar ratio of the high-purity transition metal elements Hf, Ta, Zr, Nb and Ti simple substance blocks is 1:1:1:1, and the total mass percentage is 0.85.
Step 2, smelting: production of superhard (Hf) using vacuum arc melting furnace0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Aluminium matrix composite reinforced by multi-element boride particles.
1) The weighed pure aluminum and Hf, Ta, Zr, Nb and Ti are put into a water-cooled copper crucible of a vacuum arc furnace according to the melting points from low to high, and a pure titanium block is placed in the other crucible.
2) Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in the furnace cavity, smelting pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 2min under the current condition of 100A, and smelting for 2min under the current condition of 250A.
3) And repeatedly overturning and smelting the alloy ingot for 3 times to obtain the aluminum alloy ingot with uniform tissue.
4) Then placing the aluminum alloy ingot obtained in the step 3) and the aluminum-boron binary intermediate alloy into the same crucible, and placing a certain amount of aluminum alloy ingot and the aluminum-boron binary intermediate alloy into the other crucibleIndustrial pure titanium of (1). Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting a pure Ti block to absorb residual oxygen in the furnace cavity, smelting an aluminum alloy ingot and an aluminum-boron binary intermediate alloy, smelting for 2min under the current condition of 100A, and smelting for 2min under the current condition of 250A. Repeating the turnover smelting for 4 times to obtain superhard (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material. The concrete components are as follows: al-1 (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2，(Hf0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The size of the particles is about 0.5 μm to 5 μm.
Example 2
Step 1, weighing: preparing the required raw materials in percentage by mass as follows: the molar ratio of the industrial pure aluminum 80.60 to the Al-3B intermediate alloy 16.67 to the high-purity transition metal elements Hf, Ta, Zr, Nb and Ti is 1:1:1:1, and the total mass percent is 2.73.
Step 2, smelting: production of superhard (Hf) using vacuum arc melting furnace0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Aluminium matrix composite reinforced by multi-element boride particles.
1) The weighed pure aluminum and Hf, Ta, Zr, Nb and Ti are put into a water-cooled copper crucible of a vacuum arc furnace according to the melting points from low to high, and a pure titanium block is placed in the other crucible.
2) Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in the furnace cavity, smelting pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 2min under the current condition of 250A, and smelting for 2min under the current condition of 300A.
3) And repeatedly overturning and smelting the alloy ingot for 4 times to obtain the aluminum alloy ingot with uniform tissue.
4) Then 3) to obtainThe aluminum alloy ingot and the aluminum-boron binary intermediate alloy are placed in the same crucible, and a certain amount of industrial pure titanium is placed in the other crucible. Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting a pure Ti block to absorb residual oxygen in the furnace cavity, smelting an aluminum alloy ingot and an aluminum-boron binary intermediate alloy, smelting for 2min under the current condition of 250A, and smelting for 2min under the current condition of 300A. Repeating the turnover smelting for 5 times to obtain superhard (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material. The components of the prepared composite material are as follows: al-3.23 (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2，(Hf0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Has an average size of about 5 to 10 μm. The SEM image of the finally prepared composite material is shown in figure 1, the EDS spectra of all elements in the composite material are shown in figures 2-7, the nano indentation curve of the composite material is shown in figure 8, and as can be seen from figures 1-8, multi-boride particles are successfully synthesized in an aluminum matrix, five transition group metal elements are uniformly distributed, the average size is about 5 mu m-10 mu m, and the hardness value reaches 33GPa under the load of 1500 mu N.
Example 3
Step 1, weighing: preparing the required raw materials in percentage by mass as follows: the molar ratio of the industrial pure aluminum 61.21 to the Al-3B intermediate alloy 33.33 to the high-purity transition metal elements Hf, Ta, Zr, Nb and Ti is 1:1:1:1, and the total mass percent of the elements is 5.46 respectively.
Step 2, smelting: production of superhard (Hf) using vacuum arc melting furnace0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Aluminium matrix composite reinforced by multi-element boride particles.
1) The weighed pure aluminum and Hf, Ta, Zr, Nb and Ti are put into a water-cooled copper crucible of a vacuum arc furnace according to the melting points from low to high, and a pure titanium block is placed in the other crucible.
2) Vacuuming to 110-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in the furnace cavity, smelting pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 3min under the current condition of 250A, and then smelting for 3min under the current condition of 350A.
3) And repeatedly overturning and smelting the alloy ingot for 5 times to obtain the aluminum alloy ingot with uniform tissue.
4) Then placing the aluminum alloy ingot obtained in the step 3) and the aluminum-boron binary intermediate alloy into the same crucible, and placing a certain amount of industrial pure titanium into the other crucible. Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting a pure Ti block to absorb residual oxygen in the furnace cavity, smelting an aluminum alloy ingot and an aluminum-boron binary intermediate alloy, smelting for 3min under the current condition of 250A, and then smelting for 3min under the current condition of 350A. The obtained product is repeatedly turned over and smelted for 7 times to obtain superhard (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material. The components of the prepared composite material are as follows: al-6.46 (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2，(Hf0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Has an average size of about 5 to 10 μm.
Example 4
Step 1, weighing: preparing the required raw materials in percentage by mass as follows: 36.35 parts of industrial pure aluminum, 50 parts of Al-5B intermediate alloy, and 13.65 parts of high-purity transition metal elements, namely Hf, Ta, Zr, Nb and Ti, in a molar ratio of 1:1:1: 1.
Step 2, smelting: production of superhard (Hf) using vacuum arc melting furnace0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Aluminium matrix composite reinforced by multi-element boride particles.
1) The weighed pure aluminum and Hf, Ta, Zr, Nb and Ti are put into a water-cooled copper crucible of a vacuum arc furnace according to the melting points from low to high, and a pure titanium block is placed in the other crucible.
2) Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in the furnace cavity, smelting pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 3min under the current condition of 250A, and then smelting for 3min under the current condition of 400A.
3) And repeatedly overturning and smelting the alloy ingot for 5 times to obtain the aluminum alloy ingot with uniform tissue.
4) Then placing the aluminum alloy ingot obtained in the step 3) and the aluminum-boron binary intermediate alloy into the same crucible, and placing a certain amount of industrial pure titanium into the other crucible. Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting a pure Ti block to absorb residual oxygen in the furnace cavity, smelting an aluminum alloy ingot and an aluminum-boron binary intermediate alloy, smelting for 3min under the current condition of 250A, and then smelting for 3min under the current condition of 400A. Repeating the turnover smelting for 8 times to obtain superhard (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material. The components of the prepared composite material are as follows: al-16.15 (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2，(Hf0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Has an average size of about 5 to 10 μm.
Example 5
Step 1, weighing: preparing the required raw materials in percentage by mass as follows: 8.35 parts of industrial pure aluminum, 66.29 parts of Al-7B intermediate alloy, and 25.36 parts of high-purity transition metal elements Hf, Ta, Zr, Nb and Ti in a molar ratio of 1:1:1: 1.
Step 2, smelting: production of superhard (Hf) using vacuum arc melting furnace0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Aluminium matrix composite reinforced by multi-element boride particles.
1) The weighed pure aluminum and Hf, Ta, Zr, Nb and Ti are put into a water-cooled copper crucible of a vacuum arc furnace according to the melting points from low to high, and a pure titanium block is placed in the other crucible.
2) Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in the furnace cavity, smelting pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 3min under the current condition of 250A, and then smelting for 3min under the current condition of 500A.
3) And repeatedly overturning and smelting the alloy ingot for 5 times to obtain the aluminum alloy ingot with uniform tissue.
4) Then placing the aluminum alloy ingot obtained in the step 3) and the aluminum-boron binary intermediate alloy into the same crucible, and placing a certain amount of industrial pure titanium into the other crucible. Vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa. And starting a smelting direct-current power switch, smelting a pure Ti block to absorb residual oxygen in the furnace cavity, smelting an aluminum alloy ingot and an aluminum-boron binary intermediate alloy, smelting for 3min under the current condition of 250A, and then smelting for 3min under the current condition of 500A. Repeating the turnover smelting for 8 times to obtain superhard (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material. The components of the prepared composite material are as follows: al-30 (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2，(Hf0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2Has an average size of about 5 to 10 μm.

Claims (5)

1. A preparation method of an ultrahard multi-boride particle reinforced aluminum matrix composite material is characterized by comprising the following steps:
step (1): weighing the following raw materials: weighing industrial pure aluminum, Hf, Ta, Zr, Nb and Ti simple substance blocks and aluminum-boron binary intermediate alloy according to the proportion;
step (2): smelting: will weigh outPutting pure aluminum and the simple substance blocks of Hf, Ta, Zr, Nb and Ti into a water-cooled copper crucible of a vacuum arc furnace according to the sequence of melting points from low to high, and smelting to obtain an aluminum alloy ingot; placing the obtained aluminum alloy ingot and aluminum-boron binary intermediate alloy in the same crucible, and smelting to obtain (Hf)0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material.
2. The method according to claim 1, wherein the raw materials in step (1) are specifically prepared in the following ratio:
8.35-84.15 parts of industrial pure aluminum, 15-66.29 parts of aluminum-boron binary intermediate alloy, and 0.85-25.36 parts of high-purity transition metal elements Hf, Ta, Zr, Nb and Ti in the molar ratio of 1:1:1: 1.
3. The method according to claim 2, wherein step (2) comprises in particular the steps of:
step (21): putting the weighed pure aluminum and the simple substance blocks of Hf, Ta, Zr, Nb and Ti into a water-cooled copper crucible of a vacuum arc furnace in sequence from low melting point to high melting point, and putting the pure titanium into the other crucible;
step (22): vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa, starting a smelting direct-current power switch, smelting pure Ti blocks to absorb residual oxygen in a furnace cavity, smelting industrial pure aluminum and Hf, Ta, Zr, Nb and Ti alloy, smelting for 1-3 min under the current condition of 50-250A during smelting, and then smelting for 1-3 min under the current condition of 250-500A;
step (23): repeatedly overturning and smelting the alloy ingot obtained in the step (22) for 3-5 times to obtain an aluminum alloy ingot with a uniform tissue;
step (24): placing the aluminum alloy ingot obtained in the step (23) and the aluminum-boron binary intermediate alloy into the same crucible, and placing industrial pure titanium into the other crucible; vacuum-pumping to 1 × 10-5Pa, then introducing argon protective gas to 4X 102Pa, starting a smelting direct-current power switch, and smelting firstlyThe pure Ti block is used for absorbing residual oxygen in the furnace cavity, then an aluminum alloy ingot and an aluminum-boron binary intermediate alloy are smelted, and during smelting, smelting is carried out for 1min to 3min under the current condition of 50A to 250A, and then smelting is carried out for 1min to 3min under the current condition of 250A to 500A; repeatedly overturning and smelting for 4-8 times to obtain (Hf) with uniform components0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The multi-element boride particle reinforced aluminum-base composite material.
4. An ultra hard multi boride particle reinforced aluminium matrix composite material produced by the method of any one of claims 1 to 3.
5. The composite material of claim 4 wherein (Hf) in the composite material0.2Ta0.2Zr0.2Nb0.2Ti0.2)B2The grain size of the multi-component boride is 0.5-10 mu m.
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