Super aluminum-titanium-boron, preparation process thereof and aluminum-based alloy

Abstract

The invention discloses super aluminum-titanium-boron, a preparation process thereof and an aluminum-based alloy, TiB2 is obtained by directly adding TiB2 powder, the particle size of the TiB2 is 0.5-3 microns, and the TiB2 accounts for 2-5% of the total amount of raw materials. The preparation process of the super aluminum titanium boron comprises the following steps: step 1, weighing according to parts by weight; step 2, alloying for the first step; step 3, alloying in the second step; step 4, degassing and refining; and 5, continuous casting and continuous rolling. Compared with an aluminum-titanium-boron alloy prepared by a conventional villiaumite method, the granularity of aluminum and aluminum alloy is reduced by 30-50% after the aluminum and aluminum alloy are refined; the refining capability of the aluminum-titanium-boron alloy can be effectively ensured; the aluminum-based composite material prepared by adding 0.1%-0.2% of super aluminum titanium boron into aluminum is high in comprehensive performance, the ductility of the aluminum-based composite material reaches 4.5 + / -0.3%, the tensile strength of the aluminum-based composite material is larger than or equal to 480 Mpa, and the yield strength of the aluminum-based composite material is larger than or equal to 400 Mpa.

Description

Technical Field

[0001] The invention relates to the technical field of metal smelting, and in particular to a super aluminum-titanium-boron and a preparation process thereof and an aluminum-based alloy. Background Art

[0002] Aluminum alloy is a lightweight material with broad application prospects, and aluminum-titanium-boron alloy is an intermediate alloy that is currently widely used in aluminum processing worldwide and is the most effective in refining aluminum and aluminum alloy grains.

[0003] Adding the above aluminum-titanium-boron alloy to aluminum or aluminum alloy can refine the grains of the aluminum or aluminum alloy, thereby greatly improving its yield strength, rolling plasticity, ductile-brittle transition temperature and other properties, and can be used in many fields, such as aerospace, etc. At present, the aluminum-titanium-boron master alloy manufacturing method that is widely used and effectively industrialized worldwide is the potassium fluorotitanate potassium fluoroborate aluminothermic reaction method, which produces a large amount of TB2 as the crystal nucleus of the aluminum or aluminum alloy after grain refinement.

[0004] When aluminum-titanium-boron alloy is prepared by the fluoride salt method, the size distribution range of TiB2 particles is relatively wide and has a long-tail characteristic, that is, there are more small-sized particles and the size distribution is concentrated, and there are fewer large-sized particles and the size distribution is relatively dispersed; therefore, during the refinement process, grains can only be formed on a small number of large-sized TiB2 particles, and the utilization efficiency of TiB2 prepared by the fluoride salt method is low; and there is a problem that the size range of TiB2 particles prepared by the fluoride salt method is relatively wide and difficult to accurately control and adjust. For example, the prior art CN202410477106.4, after optimization, its refinement effect is still above 1.5μm, which leads to the problem that the performance of aluminum-titanium-boron alloy still needs to be improved.

[0005] Therefore, there is an urgent need for a super aluminum-titanium-boron and its preparation process and aluminum-based alloy, which has a good aluminum-titanium-boron alloy refining effect, realizes accurate control and adjustment of the fine size and distribution dispersion of TiB2 particles, and can effectively refine the aluminum-based alloy. Summary of the invention

[0006] The purpose of the present invention is to provide a super aluminum titanium boron and its preparation process and aluminum-based alloy, which can achieve accurate control and adjustment of TiB2 size, good refinement effect, and the average grain size in the cast structure formed after the aluminum alloy refinement treatment is correspondingly smaller, thereby solving the problems existing in the above-mentioned prior art.

[0007] A super aluminum titanium boron, wherein the aluminum titanium boron contains at least TiB2, and the TiB2 particle size is less than or equal to 1.5 μm.

[0008] Optionally, TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 powder is 0.5μm to 3μm.

[0009] Preferably, the raw materials for preparing aluminum-titanium-boron also include aluminum ingots and industrial pure titanium powder, and the TiB2 accounts for 2% to 5% of the total raw materials.

[0010] A preparation process of super aluminum titanium boron:

[0011] Step 1: Weigh 920-950 parts of aluminum ingot, 20-40 parts of industrial pure titanium powder and 20-50 parts of TiB2 powder according to weight;

[0012] Step 2: The first step is alloying, placing the aluminum ingot in a variable frequency induction furnace and heating it; after melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid, and the scum on the surface of the melt is skimmed off; the temperature is continued to rise and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add the industrial pure titanium powder and TiB2 powder mixture into the variable frequency induction furnace aluminum liquid to obtain the first aluminum liquid;

[0013] Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature and continue stirring. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid.

[0014] Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, clean the furnace wall, and then use the rotary degasser for rotary degassing, spray the refining agent, degas, close the furnace, and remove the slag on the surface of the alloy liquid;

[0015] Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 5 to 10 minutes, heat up first and then keep warm, stand still for 5 to 10 minutes before casting, start the continuous casting and rolling unit, control the rolling temperature, and roll into aluminum-titanium-boron alloy wire.

[0016] Preferably, in step 2, the heating melting temperature is 720-760°C, the refining time after the introduction of argon is 13-18 minutes, and the temperature is continued to rise to 750-950°C.

[0017] Preferably, in step three, the temperature is maintained at 750-950° C., and the mixture is stirred for 20-40 minutes.

[0018] Preferably, in step 4, the refining temperature is 800-850° C., the refining agent is aluminum-titanium-boron alloy liquid, and the amount of the refining agent is 0.3% of the total charge.

[0019] Preferably, in step 4, the degassing time is 20 to 40 minutes.

[0020] Preferably, in step five, the casting temperature is 800-850° C., the casting speed is 2-3 t / h, and the cooling system of the continuous casting machine is controlled at a cooling speed of 1.5-3° C. / s.

[0021] Preferably, in step five, the rolling temperature is 500-550°C, and the rolling temperature is controlled at 280-350°C.

[0022] An aluminum-based alloy is prepared by using the super aluminum-titanium-boron prepared by the preparation method and aluminum to form an aluminum-based alloy, wherein the addition amount of the super aluminum-titanium-boron is 0.1-0.2%.

[0023] During the preparation of aluminum-titanium-boron alloy, the smaller the average size of TiB2 particles is and the more dispersed the TiB2 particles are, the more TiB2 can become an effective heterogeneous nucleation substrate during the refinement process, and the average grain size in the cast structure formed after the refinement treatment is correspondingly smaller.

[0024] In industry, the Al-Ti-B master alloy is prepared by mixed molten salt reaction method, in which the TiAl3 phase is in the form of relatively large agglomerates or long needles, and the TiB2 particles are small in size and easy to aggregate into agglomerates. After being added to the metal liquid to be treated, it is difficult to disperse. Due to its high density, it is easy to precipitate, so it basically loses the role of becoming a nucleation core. In order to improve the refining effect of the Al-Ti-B master alloy refiner, it is necessary to start from controlling the formation process of TiAl3 and TiB2 intermediate compound particles, adopt special means to improve the organization, increase the dispersion of TiB2 and reduce the size of TiAl3. Therefore, the present invention adopts the addition of TiB2 powder to prepare super AlTi5B1 to solve the existing problems. Since TiB2 is a new material, it has excellent dispersion strengthening effect, good wettability with metal aluminum liquid, extremely excellent physical and chemical properties, and excellent chemical stability. The Al-5Ti-1B alloy prepared by the two-step alloying method can realize accurate control and adjustment of TiB2 size, which is to optimize the TiB2 size distribution and improve the Al-5Ti-1B refining effect.

[0025] TiB2 particles have good stability and wettability with aluminum melt in aluminum melt. The interface energy between TiB2 and aluminum melt is low, which makes TiB2 an effective heterogeneous nucleation core. When the aluminum melt cools and solidifies, aluminum atoms will preferentially nucleate on the surface of TiB2 particles, thereby increasing the nucleation rate. Because of the increase in nucleation points, the grains will be restricted by the surrounding grains during growth and cannot grow indefinitely, which ultimately leads to the refinement of the grains of the aluminum alloy.

[0026] Ti atoms diffuse out of TiB2 and react with other elements in the aluminum liquid through the added industrial pure titanium powder. Ti is an important alloying element in aluminum alloys. It can form intermetallic compounds AL3Ti with aluminum. These intermetallic compounds play the role of strengthening phases in the alloy structure. AL3Ti phases have the characteristics of high melting point and high hardness. They are dispersed in the aluminum alloy matrix and can effectively hinder the movement of dislocations, thereby improving the strength and hardness of the alloy.

[0027] The present invention discloses a super aluminum-titanium-boron and its preparation process. Compared with the fluoride salt process, the added TiB2 particles are more uniform and smaller in size, which enables more TiB2 particles to be activated as effective heterogeneous nucleation substrates during the refinement process, optimizes the TiB2 particle size distribution, and improves the refinement performance of aluminum-titanium-boron alloys. After the refinement treatment of aluminum and aluminum alloys, the particle size of aluminum and aluminum alloys decreases by 30-50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0029] Figure 1 : Metallographic diagram of the cross section of the aluminum-titanium-boron alloy wire of the present invention;

[0030] Figure 2 : Transmission electron microscope images of the aluminum-titanium-boron alloy of the present invention: (a) TiB2 particles; (b) electron diffraction pattern;

[0031] Figure 3 : Comparison table of particle size and distribution of aluminum-titanium-boron alloy TiB2 in the embodiments of the present invention;

[0032] Figure 4 : Metallographic diagram of aluminum alloy after adding aluminum, titanium and boron in the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] The invention discloses a super aluminum titanium boron and a preparation process thereof;

[0036] Embodiment 1: A super aluminum titanium boron, wherein the aluminum titanium boron contains at least TiB2, and the particle size of the TiB2 is less than or equal to 1.5 μm. The TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 powder is 0.5 μm to 3 μm. The raw materials for preparing the aluminum titanium boron also include aluminum ingots and industrial pure titanium powder, and TiB2 accounts for 4% of the total raw materials.

[0037] A preparation process of super aluminum titanium boron:

[0038] Step 1: weigh 925 kg of aluminum ingot, 35 kg of industrial pure titanium powder and 40 kg of TiB2 powder according to weight;

[0039] Step 2: The first step is alloying. The aluminum ingot is placed in a variable frequency induction furnace and heated to a melting temperature of 750±5°C. After melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid for 15 minutes, and the scum on the surface of the melt is skimmed off. The temperature is continued to rise to 850°C and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add a mixture of industrial pure titanium powder and TiB2 powder into the aluminum liquid of the variable frequency induction furnace. Before mixing the industrial pure titanium powder and TiB2 powder, a ball mill device can be used to mix and stir them to obtain the first aluminum liquid.

[0040] In another embodiment, a powder spraying device can be used to spray TiB2 powder and industrial pure titanium powder into the aluminum liquid in a high-speed airflow. This method can make the TiB2 powder and industrial pure titanium powder well dispersed in the aluminum liquid. The high-speed airflow can blow away the powder particles and evenly distribute them at different positions of the aluminum liquid. For example, in industrial production, TiB2 powder is sprayed below the surface of the aluminum liquid through a specially designed spray gun, and the convection and stirring of the aluminum liquid are used to quickly disperse the powder into the entire melt.

[0041] The mechanical stirring used in this embodiment and the powder injection technology used in another embodiment can effectively reduce the aggregation of TiB2 powder in local areas and make it more evenly distributed in the alloy melt.

[0042] Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature at 850℃ and continue stirring for 30 minutes. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid.

[0043] Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, the refining temperature is 830°C, clean the furnace wall, and then use the rotary degasser for rotary degassing, and spray the refining agent, which is aluminum-titanium-boron alloy liquid, and the amount of refining agent is 0.3% of the total charge. Degas for 30 minutes, turn off the furnace, and remove the scum on the surface of the alloy liquid;

[0044] Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 8 minutes. Heat up first and then keep warm. Let it stand for 5 minutes before casting. The casting temperature is 830℃ and the casting speed is 2.5t / h. The cooling system of the continuous casting machine is controlled at a cooling speed of 1.5℃ / s. Start the continuous casting and rolling unit, the rolling temperature is 550℃, and the rolling temperature is controlled at 300℃ to roll into aluminum-titanium-boron alloy wire.

[0045] The average particle size of the TiB2 aluminum-titanium-boron alloy wire is 1.34μm, and the distribution is uniform. The ring film method is used to test the refining ability of aluminum and aluminum alloys. 99.75 remelted aluminum ingots are used, and the aluminum-titanium-boron addition amount is 0.2%, so that the pure aluminum particles are refined to 132.78um.

[0046] Embodiment 2: A super aluminum titanium boron, wherein the aluminum titanium boron contains at least TiB2, and the TiB2 particle size is less than or equal to 1.5 μm.

[0047] Optionally, TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 powder is 0.5μm to 3μm.

[0048] A preparation process of super aluminum titanium boron:

[0049] Step 1: weigh 930kg of aluminum ingot, 35kg of industrial pure titanium powder and 35kg of TiB2 powder according to weight;

[0050] Step 2: The first step is alloying. The aluminum ingot is placed in a variable frequency induction furnace and heated to a melting temperature of 740°C. After melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid for 18 minutes, and the scum on the surface of the melt is skimmed off. The temperature is continued to rise to 900°C and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add a mixture of industrial pure titanium powder and TiB2 powder into the aluminum liquid of the variable frequency induction furnace. Before mixing the industrial pure titanium powder and TiB2 powder, a ball mill device can be used to mix and stir them to obtain the first aluminum liquid.

[0051] Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature at 900℃ and continue stirring for 25 minutes. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid.

[0052] Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, the refining temperature is 850°C, clean the furnace wall, and then use the rotary degasser for rotary degassing, and spray the refining agent, which is aluminum-titanium-boron alloy liquid, and the amount of refining agent is 0.3% of the total charge. Degas for 40 minutes, turn off the furnace, and remove the scum on the surface of the alloy liquid;

[0053] Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 10 minutes. Heat up first and then keep warm. Let it stand for 8 minutes before casting. The casting temperature is 800℃ and the casting speed is 3t / h. The cooling system of the continuous casting machine is controlled at a cooling speed of 2℃ / s. Start the continuous casting and rolling unit, the rolling temperature is 500℃, and the rolling temperature is controlled at 350℃ to roll into aluminum-titanium-boron alloy wire.

[0054] The average particle size of the TiB2 aluminum-titanium-boron alloy wire is 1.33μm, and the distribution is uniform. The ring film method is used to test the refining ability of aluminum and aluminum alloys. 99.75 remelted aluminum ingots are used, and the aluminum-titanium-boron addition amount is 0.2%, so that the pure aluminum particles are refined to 147.59μm.

[0055] Embodiment 3: A super aluminum titanium boron, wherein the aluminum titanium boron contains at least TiB2, and the TiB2 particle size is less than or equal to 1.5 μm.

[0056] Optionally, TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 powder is 0.5μm to 3μm.

[0057] A preparation process of super aluminum titanium boron:

[0058] Step 1: weigh 940 kg of aluminum ingot, 30 kg of industrial pure titanium powder and 30 kg of TiB2 powder according to weight;

[0059] Step 2: The first step is alloying. The aluminum ingot is placed in a variable frequency induction furnace and heated to a melting temperature of 800°C. After melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid for 35 minutes, and the scum on the surface of the melt is skimmed off. The temperature is continued to rise to 870°C and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add a mixture of industrial pure titanium powder and TiB2 powder into the aluminum liquid of the variable frequency induction furnace. Before mixing the industrial pure titanium powder and TiB2 powder, a ball mill device can be used to mix and stir them to obtain the first aluminum liquid.

[0060] Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature at 800℃ and continue stirring for 40 minutes. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid.

[0061] Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, the refining temperature is 830°C, clean the furnace wall, and then use the rotary degasser for rotary degassing, and spray the refining agent, which is aluminum-titanium-boron alloy liquid, and the amount of refining agent is 0.3% of the total charge. Degas for 30 minutes, turn off the furnace, and remove the scum on the surface of the alloy liquid;

[0062] Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 10 minutes. Heat up first and then keep warm. Keep still for 10 minutes before casting. The casting temperature is 850℃ and the casting speed is 2.5t / h. The cooling system of the continuous casting machine is controlled at a cooling speed of 1.5℃ / s. Start the continuous casting and rolling unit, the rolling temperature is 530℃, and the rolling temperature is controlled at 300℃ to roll into aluminum-titanium-boron alloy wire.

[0063] The average particle size of the TiB2 aluminum-titanium-boron alloy wire is 1.41μm, and the distribution is uniform. The ring film method is used to test the refining ability of aluminum and aluminum alloys. 99.75 remelted aluminum ingots are used, and the aluminum-titanium-boron addition amount is 0.2%, so that the pure aluminum particles are refined to 159.37μm.

[0064] Embodiment 4: A super aluminum titanium boron, wherein the aluminum titanium boron contains at least TiB2, and the TiB2 particle size is less than or equal to 1.5 μm.

[0065] Optionally, TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 powder is 0.5μm to 3μm.

[0066] A preparation process of super aluminum titanium boron:

[0067] Step 1: weigh 950kg of aluminum ingot, 25kg of industrial pure titanium powder and 25kg of TiB2 powder according to weight;

[0068] Step 2: The first step is alloying. The aluminum ingot is placed in a variable frequency induction furnace and heated to a melting temperature of 800°C. After melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid for 35 minutes, and the scum on the surface of the melt is skimmed off. The temperature is continued to rise to 870°C and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add a mixture of industrial pure titanium powder and TiB2 powder into the aluminum liquid of the variable frequency induction furnace. Before mixing the industrial pure titanium powder and TiB2 powder, a ball mill device can be used to mix and stir them to obtain the first aluminum liquid.

[0069] Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature at 800℃ and continue stirring for 40 minutes. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid.

[0070] Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, the refining temperature is 830°C, clean the furnace wall, and then use the rotary degasser for rotary degassing, and spray the refining agent, which is aluminum-titanium-boron alloy liquid, and the amount of refining agent is 0.3% of the total charge. Degas for 30 minutes, turn off the furnace, and remove the scum on the surface of the alloy liquid;

[0071] Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 10 minutes. Heat up first and then keep warm. Keep still for 10 minutes before casting. The casting temperature is 850℃ and the casting speed is 2.5t / h. The cooling system of the continuous casting machine is controlled at a cooling speed of 1.5℃ / s. Start the continuous casting and rolling unit, the rolling temperature is 530℃, and the rolling temperature is controlled at 300℃ to roll into aluminum-titanium-boron alloy wire.

[0072] The average particle size of the TiB2 aluminum-titanium-boron alloy wire is 1.47μm, and the distribution is uniform. The ring film method is used to test the refining ability of aluminum and aluminum alloys. 99.75 remelted aluminum ingots are used, and the aluminum-titanium-boron addition amount is 0.2%, so that the pure aluminum particles are refined to 154.62μm.

[0073] Comparative Example 1:

[0074] A preparation process of super aluminum titanium boron:

[0075] Step 1: weigh 1000 kg of aluminum ingot according to weight, and prepare it by conventional fluoride salt method, wherein the amount of potassium fluorotitanate added is 25-28% of the aluminum ingot, and the amount of potassium fluoroborate added is 12-14% of the aluminum ingot.

[0076] The average particle size of the TiB2 aluminum-titanium-boron alloy wire is 1.76μm, and the distribution is uniform. The ring film method is used to test the refining ability of aluminum and aluminum alloys. 99.75 remelted aluminum ingots are used, and the aluminum-titanium-boron addition amount is 0.2%, so that the pure aluminum particles are refined to 249.45μm.

[0077] Comparative Example 2: A super aluminum titanium boron, wherein the aluminum titanium boron contains at least TiB2, and the TiB2 particle size is less than or equal to 1.5 μm.

[0078] Optionally, TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 powder is 0.5μm to 3μm.

[0079] A preparation process of super aluminum titanium boron:

[0080] Step 1: weigh 1000 kg of aluminum ingot, 38 kg of industrial pure titanium powder and 43 kg of TiB2 powder according to weight;

[0081] Step 2: The first step is alloying. The aluminum ingot is placed in a variable frequency induction furnace and heated to a melting temperature of 800°C. After melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid for 35 minutes, and the scum on the surface of the melt is skimmed off. The temperature is continued to rise to 870°C and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add a mixture of industrial pure titanium powder and TiB2 powder into the aluminum liquid of the variable frequency induction furnace. Before mixing the industrial pure titanium powder and TiB2 powder, a ball mill device can be used to mix and stir them to obtain the first aluminum liquid.

[0082] Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature at 800℃ and continue stirring for 40 minutes. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid.

[0083] Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, the refining temperature is 850°C, clean the furnace wall, and then use the rotary degasser for rotary degassing, and spray the refining agent, which is aluminum-titanium-boron alloy liquid, and the amount of refining agent is 0.3% of the total charge, degas for 35 minutes, turn off the furnace, and remove the scum on the surface of the alloy liquid;

[0084] Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 10 minutes. Heat up first and then keep warm. Keep still for 10 minutes before casting. The casting temperature is 850°C and the casting speed is 2.5t / h. The cooling system of the continuous casting machine is controlled at a cooling speed of 5°C / s. Start the continuous casting and rolling unit, the rolling temperature is 500°C, and the rolling temperature is controlled at 350°C to roll into aluminum-titanium-boron alloy wire.

[0085] The average particle size of the TiB2 aluminum-titanium-boron alloy wire is 1.44 μm, which is evenly distributed, and the aluminum is refined to 143.83 μm.

[0086] like Figures 1 to 3 As shown: According to the comparative example, the aluminum-titanium-boron alloy of the present invention, in which TiB2 accounts for 2% to 5% of the total raw material and the particle size is 0.5 μm to 3 μm, has a 30% to 50% lower refinement degree than the aluminum-titanium-boron alloy prepared by the conventional fluoride salt method when the aluminum and aluminum alloy are refined;

[0087] In addition, the present invention adopts a casting temperature of 800-850°C, a casting speed of 2-3 t / h, and a cooling system of the continuous casting machine controlled at a cooling speed of 1.5-3°C / s, which can effectively ensure the refinement of the aluminum-titanium-boron alloy.

[0088] like Figure 4 As shown, the present invention adopts a two-step alloying method to enhance the wettability between particles and aluminum matrix.

[0089] The aluminum-based composite material prepared by adding 0.1% to 0.2% super aluminum titanium boron into aluminum has high comprehensive performance, an elongation of 4.5±0.3%, a tensile strength of greater than or equal to 480Mpa, and a yield strength of greater than or equal to 400Mpa.

[0090] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A super aluminum titanium boron, characterized in that: The aluminum titanium boron contains at least TiB2, and the TiB2 particle size is less than or equal to 1.5 μm.

2. A super aluminum titanium boron according to claim 1, characterized in that: The TiB2 is obtained by directly adding TiB2 powder, and the particle size of the TiB2 is 0.5 μm to 3 μm.

3. The super aluminum titanium boron according to claim 1, characterized in that: The raw materials for preparing aluminum-titanium-boron also include aluminum ingots and industrial pure titanium powder, and the TiB2 accounts for 2% to 5% of the total raw materials.

4. A preparation process of super aluminum titanium boron, characterized in that: Step 1: Weigh 920-950 parts of aluminum ingot, 20-40 parts of industrial pure titanium powder and 20-50 parts of TiB2 powder according to weight; Step 2: The first step is alloying, placing the aluminum ingot in a variable frequency induction furnace and heating it; after melting, argon gas is introduced into the aluminum liquid to refine the aluminum liquid, and the scum on the surface of the melt is skimmed off; the temperature is continued to rise and the mechanical stirrer and the variable frequency induction furnace feeder are turned on to evenly add the industrial pure titanium powder and TiB2 powder mixture into the variable frequency induction furnace aluminum liquid to obtain the first aluminum liquid; Step 3: The second step is alloying. Turn on the variable frequency induction furnace and put it in the stirring frequency band. Keep the temperature and continue stirring. Switch the variable frequency induction furnace to the heating frequency band. Stop the furnace after reaching the set temperature. Add slag remover to the alloy liquid. After stirring evenly, remove the slag on the surface of the alloy liquid. Step 4: Degassing and refining: transfer the slag-free molten metal into the refining and casting furnace, turn on the variable frequency induction furnace to heat up, clean the furnace wall, and then use the rotary degasser for rotary degassing, spray the refining agent, degas, close the furnace, and remove the slag on the surface of the alloy liquid; Step 5: Continuous casting and rolling: After cleaning the surface slag, turn on the medium frequency induction furnace and stir for 5 to 10 minutes, heat up first and then keep warm, stand still for 5 to 10 minutes before casting, start the continuous casting and rolling unit, control the rolling temperature, and roll into aluminum-titanium-boron alloy wire.

5. The preparation process of super aluminum titanium boron according to claim 4, characterized in that: In step 2, the heating melting temperature is 720-760°C, the refining time after the argon gas is introduced is 13-18 minutes, and the temperature is continued to rise to 750-950°C.

6. The super aluminum titanium boron and its preparation process according to claim 4, characterized in that: In step 3, the temperature is maintained at 750-950° C. and stirred for 20-40 minutes.

7. The super aluminum titanium boron and its preparation process according to claim 4, characterized in that: In step 4, the refining temperature is 800-850° C., the refining agent is aluminum-titanium-boron alloy liquid, and the amount of the refining agent is 0.3% of the total charge.

8. The super aluminum titanium boron and its preparation process according to claim 4, characterized in that: In step 4, the degassing time is 20 to 40 minutes.

9. The super aluminum titanium boron and its preparation process according to claim 4, characterized in that: In step five, the casting temperature is 800-850°C, the casting speed is 2-3 t / h, and the cooling system of the continuous casting machine is controlled at a cooling speed of 1.5-3°C / s; the rolling temperature is 500-550°C, and the rolling temperature is controlled at 280-350°C.

10. An aluminum-based alloy, characterized in that: The super aluminum titanium boron prepared by the preparation method of any one of claims 4 to 9 and aluminum are prepared into an aluminum-based alloy, wherein the addition amount of the super aluminum titanium boron is 0.1 to 0.2%.

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