阅读说明：本技术 一种电力设施用铝合金耐腐蚀结构件材料及其制备方法 (Aluminum alloy corrosion-resistant structural member material for electric power facilities and preparation method thereof ) 是由 樊磊 李波 何锦航 白洁 孙博 黄朝文 李伟 石维 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种电力设施用铝合金耐腐蚀结构件材料及其制备方法,结构件材料主成分含量按重量百分比计：硅6.4-8.2%、镁3.5-4.6%、铁0.25-0.45%、钛2.8-4.2%、铬0.3-0.9%、锆0.02-0.06%、锶0.015-0.025%、锰0.6-1.0%、钴0.06-0.15%、稀土元素0.1-0.3%、铂0.3-0.8%、铼0.15-0.25%,余量为Al。本发明可提高现有电力设施用铝合金结构件的力学性能和耐腐蚀性能,进而提高其使用寿命。(The invention discloses an aluminum alloy corrosion-resistant structural member material for electric power facilities and a preparation method thereof, wherein the structural member material comprises the following main components in percentage by weight: 6.4 to 8.2 percent of silicon, 3.5 to 4.6 percent of magnesium, 0.25 to 0.45 percent of iron, 2.8 to 4.2 percent of titanium, 0.3 to 0.9 percent of chromium, 0.02 to 0.06 percent of zirconium, 0.015 to 0.025 percent of strontium, 0.6 to 1.0 percent of manganese, 0.06 to 0.15 percent of cobalt, 0.1 to 0.3 percent of rare earth element, 0.3 to 0.8 percent of platinum, 0.15 to 0.25 percent of rhenium, and the balance of Al. The invention can improve the mechanical property and the corrosion resistance of the aluminum alloy structural member for the existing electric power facility, thereby prolonging the service life of the aluminum alloy structural member.)

1. The aluminum alloy corrosion-resistant structural member material for the electric power facility is characterized by comprising the following main components in percentage by weight: 6.4 to 8.2 percent of silicon, 3.5 to 4.6 percent of magnesium, 0.25 to 0.45 percent of iron, 2.8 to 4.2 percent of titanium, 0.3 to 0.9 percent of chromium, 0.02 to 0.06 percent of zirconium, 0.015 to 0.025 percent of strontium, 0.6 to 1.0 percent of manganese, 0.06 to 0.15 percent of cobalt, 0.1 to 0.3 percent of rare earth element, 0.3 to 0.8 percent of platinum, 0.15 to 0.25 percent of rhenium, and the balance of Al.

2. The aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in claim 1, wherein the main component contents are, in weight percent: 7-7.6% of silicon, 3.8-4.2% of magnesium, 0.3-0.4% of iron, 3.2-3.8% of titanium, 0.5-0.7% of chromium, 0.03-0.05% of zirconium, 0.018-0.022% of strontium, 0.7-0.9% of manganese, 0.09-0.12% of cobalt, 0.15-0.25% of rare earth elements, 0.5-0.6% of platinum, 0.18-0.22% of rhenium, and the balance of Al.

3. The aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in claim 2, wherein the main component contents are, in weight percent: 7.3% of silicon, 4% of magnesium, 0.35% of iron, 3.5% of titanium, 0.6% of chromium, 0.04% of zirconium, 0.02% of strontium, 0.8% of manganese, 0.11% of cobalt, 0.2% of rare earth elements, 0.55% of platinum, 0.2% of rhenium and the balance of Al.

4. The aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in claim 1, wherein said rare earth element is a mixture of samarium and cerium in a weight ratio of 1: 1.2-1.8.

5. The method for producing an aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in any one of claims 1 to 4, characterized by comprising the steps of:

selecting a group of substance combinations in the weight percentage range, determining the weight ratio, and calculating the weight of each material, wherein the silicon, the magnesium, the iron, the titanium, the chromium, the zirconium, the strontium, the manganese, the cobalt, the rare earth elements, the platinum, the rhenium and the aluminum are respectively added in a mode of metal silicon, an aluminum-magnesium intermediate alloy, an aluminum-iron intermediate alloy, an aluminum-titanium intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-strontium intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-cobalt intermediate alloy, rare earth element powder, a platinum ingot, an aluminum-rhenium intermediate alloy and an aluminum ingot;

step two, putting the aluminum ingot weighed in the step one into a smelting furnace, heating and melting at 760-;

blowing a refining agent into a preset position of the liquid level of the second molten metal liquid through nitrogen for refining, standing for 20-25min after refining for skimming the scum on the upper surface of the molten liquid surface, then cooling the second molten metal liquid to 770-780 ℃, adding the metal silicon into the second molten metal liquid, blowing the refining agent into the preset position of the molten liquid surface through nitrogen for refining after the metal silicon is completely molten, and standing for 18-25min after refining for skimming the scum on the upper surface of the molten liquid surface to obtain the aluminum alloy metal liquid;

and step four, detecting the components of the aluminum alloy molten metal, supplementing materials according to the detection result to enable the components of the aluminum alloy molten metal to meet the raw material proportion, pouring the obtained aluminum alloy molten metal into a forming die of the structural member of the power facility, cooling and forming after the pouring is finished, and then carrying out solid solution treatment and homogenization treatment to obtain the corrosion-resistant aluminum alloy structural member for the power facility.

6. The method for preparing the aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in claim 5, wherein in the second step, the aluminum-magnesium intermediate alloy, the aluminum-iron intermediate alloy, the aluminum-titanium intermediate alloy, the aluminum-chromium intermediate alloy, the aluminum-zirconium intermediate alloy, the aluminum-strontium intermediate alloy, the aluminum-manganese intermediate alloy, the aluminum-cobalt intermediate alloy, the platinum ingot and the aluminum-rhenium intermediate alloy are preheated before being added to the first molten metal, and the preheating temperature is 200-.

7. The method for preparing an aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in claim 5, wherein the temperature rise rate of the first molten metal liquid in the second step is 18 to 25 ℃/min, and the temperature drop rate of the second molten metal liquid in the third step is 20 to 28 ℃/min.

8. The method for preparing the aluminum alloy corrosion-resistant structural member material for the electric power facilities as claimed in claim 5, wherein the refining agent in the third step is composed of the following components in parts by weight: 18-25 parts of sodium nitrate, 5-12 parts of potassium fluotitanate, 33-42 parts of potassium chloride, 15-20 parts of zinc chloride, 3-8 parts of sodium sulfate, 10-15 parts of phosphorus pentachloride, 12-18 parts of sodium fluoborate, 8-14 parts of aluminum fluoride, 10-15 parts of charcoal powder and 5-10 parts of sodium carbonate.

9. The method for preparing the aluminum alloy corrosion-resistant structural member material for electric power facilities as recited in claim 5, wherein the aluminum alloy corrosion-resistant structural member is heated to 550-580 ℃ for heat preservation for 6-8h during the solution treatment in the fourth step, the solution treatment is completed and cooled to room temperature, the homogenization treatment is carried out at 480-530 ℃ for 4-6 h.

Technical Field

The invention relates to an aluminum alloy corrosion-resistant structural member material for an electric power facility and a preparation method thereof, belonging to the technical field of aluminum alloy structural members.

Background

The power equipment is a power production and consumption system which consists of links of power generation, power transmission, power transformation, power distribution, power utilization and the like. The primary energy in the nature is converted into electric power by a power generation device, and then the electric power is supplied to each user through power transmission, power transformation and power distribution. The power generation equipment mainly comprises power generation equipment and power supply equipment, wherein the power generation equipment mainly comprises a power station boiler, a steam turbine, a gas turbine, a water turbine, a generator, an ignition machine, a transformer and the like, and the power supply equipment mainly comprises power transmission lines, mutual inductors, contactors and the like with various voltage grades.

At present, most of electric facilities are made of metal materials, aluminum alloy in the metal materials is one of materials commonly used for the electric facilities, but the aluminum alloy materials for the electric facilities have insufficient corrosion resistance, and the electric facilities are easy to corrode and cause the service life to be reduced if the electric facilities are used outdoors.

Disclosure of Invention

Based on the above, the invention provides the aluminum alloy corrosion-resistant structural member material for the electric power facility and the preparation method thereof, which can improve the mechanical property and the corrosion resistance of the aluminum alloy structural member for the electric power facility, further prolong the service life of the aluminum alloy structural member, and overcome the defects of the prior art.

The technical scheme of the invention is as follows: an aluminum alloy corrosion-resistant structural member material for electric power facilities comprises the following main components in percentage by weight: 6.4 to 8.2 percent of silicon, 3.5 to 4.6 percent of magnesium, 0.25 to 0.45 percent of iron, 2.8 to 4.2 percent of titanium, 0.3 to 0.9 percent of chromium, 0.02 to 0.06 percent of zirconium, 0.015 to 0.025 percent of strontium, 0.6 to 1.0 percent of manganese, 0.06 to 0.15 percent of cobalt, 0.1 to 0.3 percent of rare earth element, 0.3 to 0.8 percent of platinum, 0.15 to 0.25 percent of rhenium, and the balance of Al.

Preferably, the main components comprise the following components in percentage by weight: 7-7.6% of silicon, 3.8-4.2% of magnesium, 0.3-0.4% of iron, 3.2-3.8% of titanium, 0.5-0.7% of chromium, 0.03-0.05% of zirconium, 0.018-0.022% of strontium, 0.7-0.9% of manganese, 0.09-0.12% of cobalt, 0.15-0.25% of rare earth elements, 0.5-0.6% of platinum, 0.18-0.22% of rhenium, and the balance of Al.

Preferably, the main components comprise the following components in percentage by weight: 7.3% of silicon, 4% of magnesium, 0.35% of iron, 3.5% of titanium, 0.6% of chromium, 0.04% of zirconium, 0.02% of strontium, 0.8% of manganese, 0.11% of cobalt, 0.2% of rare earth elements, 0.55% of platinum, 0.2% of rhenium and the balance of Al.

Preferably, the rare earth element is a mixture of samarium and cerium, and the weight ratio of the samarium to the cerium is 1: 1.2-1.8.

The invention also provides a preparation method of the aluminum alloy corrosion-resistant structural member material for the electric power facility, which comprises the following steps:

selecting a group of substance combinations in the weight percentage range, determining the weight ratio, and calculating the weight of each material, wherein the silicon, the magnesium, the iron, the titanium, the chromium, the zirconium, the strontium, the manganese, the cobalt, the rare earth elements, the platinum, the rhenium and the aluminum are respectively added in a mode of metal silicon, an aluminum-magnesium intermediate alloy, an aluminum-iron intermediate alloy, an aluminum-titanium intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-strontium intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-cobalt intermediate alloy, rare earth element powder, a platinum ingot, an aluminum-rhenium intermediate alloy and an aluminum ingot;

step two, putting the aluminum ingot weighed in the step one into a smelting furnace, heating and melting at 760-;

blowing a refining agent into a preset position of the liquid level of the second molten metal liquid through nitrogen for refining, standing for 20-25min after refining for skimming the scum on the upper surface of the molten liquid surface, then cooling the second molten metal liquid to 770-780 ℃, adding the metal silicon into the second molten metal liquid, blowing the refining agent into the preset position of the molten liquid surface through nitrogen for refining after the metal silicon is completely molten, and standing for 18-25min after refining for skimming the scum on the upper surface of the molten liquid surface to obtain the aluminum alloy metal liquid;

and step four, detecting the components of the aluminum alloy molten metal, supplementing materials according to the detection result to enable the components of the aluminum alloy molten metal to meet the raw material proportion, pouring the obtained aluminum alloy molten metal into a forming die of the structural member of the power facility, cooling and forming after the pouring is finished, and then carrying out solid solution treatment and homogenization treatment to obtain the corrosion-resistant aluminum alloy structural member for the power facility.

Preferably, in the second step, the aluminum-magnesium intermediate alloy, the aluminum-iron intermediate alloy, the aluminum-titanium intermediate alloy, the aluminum-chromium intermediate alloy, the aluminum-zirconium intermediate alloy, the aluminum-strontium intermediate alloy, the aluminum-manganese intermediate alloy, the aluminum-cobalt intermediate alloy, the platinum ingot and the aluminum-rhenium intermediate alloy are preheated before being added into the first molten metal, and the preheating temperature is 200-.

Preferably, the temperature rise rate of the first molten metal liquid in the second step is 18-25 ℃/min, and the temperature drop rate of the second molten metal liquid in the third step is 20-28 ℃/min.

Preferably, the refining agent in the third step consists of the following components in parts by weight: 18-25 parts of sodium nitrate, 5-12 parts of potassium fluotitanate, 33-42 parts of potassium chloride, 15-20 parts of zinc chloride, 3-8 parts of sodium sulfate, 10-15 parts of phosphorus pentachloride, 12-18 parts of sodium fluoborate, 8-14 parts of aluminum fluoride, 10-15 parts of charcoal powder and 5-10 parts of sodium carbonate.

Preferably, in the step four, the aluminum alloy corrosion-resistant structural member is heated to the temperature of 550-.

The invention has the beneficial effects that: the aluminum alloy corrosion-resistant structural member material for the electric power facility, which is prepared by adopting the raw material formula, is added with silicon, titanium, chromium, zirconium, strontium, manganese, cobalt, rare earth elements, platinum and rhenium in the aluminum-magnesium alloy, the silicon can form a strengthening phase in the aluminum-magnesium alloy, the strength of the aluminum alloy can be improved, and the titanium and the aluminum can form TiA l₂The phase plays a role in refining a casting structure and a welding seam structure, and the hardness and the strength of the aluminum alloy can be effectively improved by adding chromiumToughness and corrosion resistance; zirconium is capable of forming ZrAl with aluminum₃The compound can hinder the internal recrystallization process of the aluminum alloy, refine recrystallized grains and effectively improve the mechanical property of the aluminum alloy; strontium can change the intermetallic compound phase in the aluminum alloy, can reduce primary crystal silicon particle size, improve the plastic working process, and the ductility, high temperature oxidation resistance, easy processing nature, chemical stability and the corrosion resistance of aluminum alloy can be improved to platinum and rhenium additive, and rare earth element can play microalloying's effect, can adsorb at the grain boundary selectivity, has the effect of refining the crystalline grain, can effectively improve the intensity of aluminum alloy.

Detailed Description

The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

The preparation method of the aluminum alloy corrosion-resistant structural member material for the electric power facility comprises the following steps:

selecting a group of substance combinations within the weight percentage range of the aluminum alloy corrosion-resistant structural member material for the electric power equipment, determining the weight ratio, and calculating the weight of each material, wherein silicon, magnesium, iron, titanium, chromium, zirconium, strontium, manganese, cobalt, rare earth elements, platinum, rhenium and aluminum are added in the modes of metallic silicon, aluminum-magnesium intermediate alloy, aluminum-iron intermediate alloy, aluminum-titanium intermediate alloy, aluminum-chromium intermediate alloy, aluminum-zirconium intermediate alloy, aluminum-strontium intermediate alloy, aluminum-manganese intermediate alloy, aluminum-cobalt intermediate alloy, rare earth element powder, platinum ingot, aluminum-rhenium intermediate alloy and aluminum ingot respectively.

And step two, putting the aluminum ingot weighed in the step one into a smelting furnace, heating and melting at 770 ℃, adding an aluminum-magnesium intermediate alloy, an aluminum-iron intermediate alloy, an aluminum-titanium intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-strontium intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-cobalt intermediate alloy, a platinum ingot and an aluminum-rhenium intermediate alloy, continuously heating and melting to form a first molten metal liquid, adding rare earth element powder, heating to 1150 ℃, melting the rare earth element powder to obtain a second molten metal liquid, wherein the heating rate is 22 ℃/min. Wherein, the aluminum-magnesium intermediate alloy, the aluminum-iron intermediate alloy, the aluminum-titanium intermediate alloy, the aluminum-chromium intermediate alloy, the aluminum-zirconium intermediate alloy, the aluminum-strontium intermediate alloy, the aluminum-manganese intermediate alloy, the aluminum-cobalt intermediate alloy, the platinum ingot and the aluminum-rhenium intermediate alloy are preheated before being added into the first molten metal, and the preheating temperature is 240 ℃.

And thirdly, blowing a refining agent into 2/3 parts of the liquid level of the second molten metal through nitrogen for refining, standing for 23min after refining for skimming the scum on the upper surface of the liquid level, then cooling the second molten metal to 775 ℃, wherein the cooling rate is 24 ℃/min, adding the silicon metal into the second molten metal, blowing the refining agent into 2/3 parts of the liquid level through nitrogen for refining after the silicon metal is completely molten, and standing for 20min after refining for skimming the scum on the upper surface of the liquid level to obtain the aluminum alloy liquid metal. In the embodiment, the refining agent comprises the following components in parts by weight: 20 parts of sodium nitrate, 8 parts of potassium fluotitanate, 37 parts of potassium chloride, 18 parts of zinc chloride, 5 parts of sodium sulfate, 12 parts of phosphorus pentachloride, 15 parts of sodium fluoborate, 9 parts of aluminum fluoride, 12 parts of charcoal powder and 8 parts of sodium carbonate.

And step four, detecting the components of the aluminum alloy molten metal, supplementing materials according to the detection result to enable the components of the aluminum alloy molten metal to meet the raw material proportion, pouring the obtained aluminum alloy molten metal into a forming die of the structural member of the power facility, cooling and forming after the pouring is finished, and then carrying out solution treatment and homogenization treatment, wherein the aluminum alloy corrosion-resistant structural member is heated to 570 ℃ for heat preservation for 7 hours during the solution treatment, the aluminum alloy corrosion-resistant structural member is cooled to room temperature after the solution treatment, the average temperature during the homogenization treatment is 500 ℃, the treatment time is 5 hours, and the aluminum alloy corrosion-resistant structural member for the power facility is obtained after the solution treatment.

Example 1:

the aluminum alloy corrosion-resistant structural member material for the power facility comprises the following components in percentage by weight: 6.4% of silicon, 3.5% of magnesium, 0.25% of iron, 2.8% of titanium, 0.3% of chromium, 0.02% of zirconium, 0.015% of strontium, 0.6% of manganese, 0.06% of cobalt, 0.1% of rare earth elements, 0.3% of platinum, 0.15% of rhenium, and the balance of Al and inevitable impurities. In this embodiment, the rare earth element is a mixture of samarium and cerium, wherein the weight ratio of samarium to cerium is 1: 1.5. the preparation method is as described above.

Example 2:

the aluminum alloy corrosion-resistant structural member material for the power facility comprises the following components in percentage by weight: 7.3% of silicon, 4% of magnesium, 0.35% of iron, 3.5% of titanium, 0.6% of chromium, 0.04% of zirconium, 0.02% of strontium, 0.8% of manganese, 0.11% of cobalt, 0.2% of rare earth elements, 0.55% of platinum, 0.2% of rhenium, and the balance of Al and inevitable impurities. In this embodiment, the rare earth element is a mixture of samarium and cerium, wherein the weight ratio of samarium to cerium is 1: 1.5. the preparation method is as described above.

Example 3:

the aluminum alloy corrosion-resistant structural member material for the power facility comprises the following components in percentage by weight: 8.2% of silicon, 4.6% of magnesium, 0.45% of iron, 4.2% of titanium, 0.9% of chromium, 0.06% of zirconium, 0.025% of strontium, 1.0% of manganese, 0.15% of cobalt, 0.3% of rare earth elements, 0.8% of platinum, 0.25% of rhenium, and the balance of Al and inevitable impurities. In this embodiment, the rare earth element is a mixture of samarium and cerium, wherein the weight ratio of samarium to cerium is 1: 1.5. the preparation method is as described above.

Example 4:

the aluminum alloy corrosion-resistant structural member material for the power facility comprises the following components in percentage by weight: 6.4% of silicon, 3.5% of magnesium, 0.25% of iron, 2.8% of titanium, 0.3% of chromium, 0.02% of zirconium, 0.015% of strontium, 0.6% of manganese, 0.06% of cobalt, 0.3% of platinum, 0.15% of rhenium, and the balance of Al and inevitable impurities. The preparation method is as described above.

Example 5:

the aluminum alloy corrosion-resistant structural member material for the power facility comprises the following components in percentage by weight: 6.4% of silicon, 3.5% of magnesium, 0.25% of iron, 2.8% of titanium, 0.3% of chromium, 0.02% of zirconium, 0.015% of strontium, 0.6% of manganese, 0.06% of cobalt, 0.1% of rare earth elements, 0.15% of rhenium, and the balance of Al and inevitable impurities. The preparation method is as described above.

Example 6:

the aluminum alloy corrosion-resistant structural member material for the power facility comprises the following components in percentage by weight: 6.4% of silicon, 3.5% of magnesium, 0.25% of iron, 2.8% of titanium, 0.3% of chromium, 0.02% of zirconium, 0.015% of strontium, 0.6% of manganese, 0.06% of cobalt, 0.1% of rare earth elements, 0.3% of platinum, 0.15% of rhenium, and the balance of Al and inevitable impurities. In this embodiment, the rare earth element is a mixture of samarium and cerium, wherein the weight ratio of samarium to cerium is 1: 1.5. the preparation method is as described above, but the difference is that the obtained aluminum alloy molten metal is poured into a forming die of the structural part of the power facility, and after the pouring is finished, the aluminum alloy corrosion-resistant structural part for the power facility is obtained by cooling and forming, namely the preparation method has no solid solution treatment and homogenization treatment.

Taking the aluminum alloy structural members for electric power facilities prepared in the above examples 1 to 6 as an experimental group 1, an experimental group 2, an experimental group 3, an experimental group 4, an experimental group 5 and an experimental group 6, respectively, taking the aluminum alloy structural member for electric power facilities sold in the market as a control group, and taking the mechanical properties of the selected aluminum alloy structural member and corrosion resistance effects under different conditions, wherein the mechanical properties comprise yield strength (MPa), tensile strength (MPa) and elongation percentage (%), and when the corrosion resistance is tested, a sample (1mm x 10mm x 120mm) of the aluminum alloy structural member is put into 10% sodium hydroxide and 10% hydrochloric acid solution to be soaked for 100h, and then the weight (g) of the sample sheet is measured, wherein the test results are as shown in table 1:

TABLE 1 test results

As can be seen from Table 1, the mechanical properties and corrosion resistance of the aluminum alloy structural member for the power facility produced by the method are remarkably improved compared with those of the conventional aluminum alloy structural member, rare earth elements and platinum in the raw materials are respectively removed in the examples 4 and 5, and compared with the example 1, the mechanical properties and the corrosion resistance of the aluminum alloy structural member for the power facility are remarkably improvedThe chemical properties and corrosion resistance are reduced, while example 6, which is not subjected to solution treatment and homogenization treatment, has significantly reduced mechanical properties and corrosion resistance. According to the invention, silicon, titanium, chromium, zirconium, strontium, manganese, cobalt, rare earth elements, platinum and rhenium are added into the aluminum-magnesium alloy, silicon can form a strengthening phase in the aluminum-magnesium alloy, the strength of the aluminum alloy can be improved, and titanium and aluminum can form TiAl₂The chromium is added, so that the hardness, strength, toughness and corrosion resistance of the aluminum alloy can be effectively improved; zirconium is capable of forming ZrAl with aluminum₃The compound can hinder the internal recrystallization process of the aluminum alloy, refine recrystallized grains and effectively improve the mechanical property of the aluminum alloy; strontium can change the intermetallic compound phase in the aluminum alloy, can reduce primary crystal silicon particle size, improve the plastic working process, and the ductility, high temperature oxidation resistance, easy processing nature, chemical stability and the corrosion resistance of aluminum alloy can be improved to platinum and rhenium additive, and rare earth element can play microalloying's effect, can adsorb at the grain boundary selectivity, has the effect of refining the crystalline grain, can effectively improve the intensity of aluminum alloy.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.