CN-117867304-B - Modified ZL303 aluminum alloy and manufacturing method thereof

Abstract

The invention belongs to the technical field of aluminum alloy, in particular to a modified ZL303 aluminum alloy and a manufacturing method thereof, wherein a ZL303 aluminum alloy is modified by adopting a Zr-based amorphous nanocrystalline alloy regulator, and the hardness and toughness of the ZL303 aluminum alloy are improved under the condition that the properties of good corrosion resistance, casting performance and the like of the ZL303 aluminum alloy are maintained by modifying the ZL303 aluminum alloy, and the average grain size of the modified ZL303 aluminum alloy manufactured by the method is 8.0-8.5 mu m, the Vickers hardness is not less than 75HV, the tensile strength is not less than 220MPa, and the fracture toughness is not less than 70 kg-mm ‑3/2 .

Inventors

• JIA YIQING
• GUO JIANJUN
• LI YONGBIN
• ZHANG SHIJIE
• BIAN YUQING
• ZHU LIN
• WANG FANG

Assignees

• 太原科技大学

Dates

Publication Date

20260505

Application Date

20240104

Claims (8)

1. 1. The manufacturing method of the modified ZL303 aluminum alloy is characterized by comprising the following steps of: S1, placing an ZL303 aluminum alloy ingot into a closed ceramic crucible, heating to 700-730 ℃ and preserving heat for 15-30 min to enable the ZL303 aluminum alloy ingot to be completely melted, and forming aluminum alloy melt; S2, adding a Zr-based amorphous nanocrystalline alloy regulator into an aluminum alloy melt, standing at 600-650 ℃ for heat preservation for 3-5 min, stirring and dispersing, cooling to 580-590 ℃ in the stirring and dispersing process, and then preserving heat for 15-25 min to obtain ZL303 aluminum alloy melt containing Zr-based amorphous nanocrystalline alloy, wherein the adding amount of the Zr-based amorphous nanocrystalline alloy regulator is 0.1-0.2% of the mass of an aluminum alloy ingot casting of ZL303, the preparation method of the Zr-based amorphous nanocrystalline alloy regulator comprises the steps of fully mixing ZrTiCuNi amorphous alloy powder with the granularity of 10-30 mu m and Al powder with the granularity of 45-50 mu m in a mass ratio of (2-4) (6-8) in a ball mill, and then pressing into a cylindrical casting blank, wherein the casting blank is the Zr-based amorphous nanocrystalline alloy regulator, and the Zr-based amorphous nanocrystalline alloy regulator is preserved in a vacuum environment, wherein the composition of ZrTiCuNi amorphous alloy powder comprises, by weight, 11wt% of Ti, 13wt% of Cu, 9wt% of Ni and the balance of Zr 3 wt%; S3, casting ZL303 aluminum alloy melt containing Zr-based amorphous nanocrystalline into a steel mold, and naturally cooling to obtain the modified ZL303 aluminum alloy.
2. 2. The method for producing modified ZL303 aluminum alloy according to claim 1, wherein in step S1, after forming aluminum alloy melt, hexachloroethane is wrapped with aluminum foil, immersed in aluminum alloy melt in a closed ceramic crucible by a bell jar method, refined at 700-730 ℃ for 8-15 min, then deslagged, and cooled to 600-650 ℃ after deslagging.
3. 3. The method for producing a modified ZL303 aluminum alloy as claimed in claim 2, wherein in the step S1, the addition amount of hexachloroethane is 0.2 to 0.4% of the mass of the ZL303 aluminum alloy ingot.
4. 4. The method for producing a modified ZL303 aluminum alloy according to claim 1, wherein in the step S2, the stirring rate is 150 to 200rpm and the stirring time is 3 to 8 minutes.
5. 5. The method according to claim 1, wherein in the step S2, the Zr-based amorphous nanocrystalline alloy modifier wrapped with aluminum foil paper is put into the aluminum alloy melt in the closed ceramic crucible after slag removal by a bell jar method.
6. 6. The method for producing a modified ZL303 aluminum alloy according to claim 1, wherein the steel mold is at a temperature of 100 to 150 ℃ in step S3.
7. 7. The modified ZL303 aluminum alloy is manufactured by the manufacturing method of the modified ZL303 aluminum alloy according to any one of claims 1 to 6, wherein the modified ZL303 aluminum alloy has the Vickers hardness of more than or equal to 75HV, the tensile strength of more than or equal to 220MPa, and the fracture toughness of more than or equal to 70 kg.mm -3/2 .
8. 8. The modified ZL303 aluminum alloy as claimed in claim 7, wherein the modified ZL303 aluminum alloy has a grain size average size of 8.0 to 8.5 μm.

Description

Modified ZL303 aluminum alloy and manufacturing method thereof Technical Field The invention relates to the technical field of metal material surface modification, in particular to a modified ZL303 aluminum alloy and a manufacturing method thereof. Background The aluminum alloy is an alloy based on aluminum and added with a certain amount of other alloying elements, and is one of light metal materials. In addition to having the general characteristics of aluminum, aluminum alloys have specific characteristics of some alloys due to the variety and amount of alloying elements added. The aluminum alloy has higher tensile strength, the specific strength is close to that of high alloy steel, the specific rigidity is higher than that of steel, the aluminum alloy has good casting performance and plastic workability, good electric conductivity and heat conductivity, good corrosion resistance and weldability, can be used as a structural material, and has wide application in aerospace, aviation, transportation, construction, electromechanics, lightening and daily necessities. The ZL303 aluminum alloy has high corrosion resistance, similar to ZL301 aluminum alloy, better casting performance, shrinkage tendency, hot cracking tendency and the like than those of ZL301 aluminum alloy, large shrinkage, general air tightness, no heat treatment strengthening of ZL303 aluminum alloy castings, better high-temperature performance than that of ZL301 aluminum alloy, better cutting performance than that of ZL301 aluminum alloy, obviously improved weldability than that of ZL301 aluminum alloy, and simple production process. However, the hardness and toughness of ZL303 aluminum alloy are poor, so that the alloy is only suitable for preparing parts such as ships, aviation, internal combustion engines and the like which bear medium loads. Disclosure of Invention In order to solve the problems in the prior art, the main purpose of the invention is to provide a modified ZL303 aluminum alloy and a manufacturing method thereof, wherein the hardness and toughness of the ZL303 aluminum alloy are further improved under the condition of keeping the performances of good corrosion resistance, casting performance and the like by modifying the ZL303 aluminum alloy. In order to solve the technical problems, according to one aspect of the present invention, the following technical solutions are provided: a manufacturing method of a modified ZL303 aluminum alloy comprises the following steps: S1, placing an ZL303 aluminum alloy ingot into a closed ceramic crucible, heating to 700-730 ℃ and preserving heat for 15-30 min to enable the ZL303 aluminum alloy ingot to be completely melted, and forming aluminum alloy melt; s2, adding a Zr-based amorphous nanocrystalline alloy regulator into the aluminum alloy melt, standing at 600-650 ℃ for 3-5 min, stirring and dispersing, cooling to 580-590 ℃ in the stirring and dispersing process, and then preserving the heat for 15-25 min to obtain ZL303 aluminum alloy melt containing Zr-based amorphous nanocrystalline; S3, casting ZL303 aluminum alloy melt containing Zr-based amorphous nanocrystalline into a steel mold, and naturally cooling to obtain the modified ZL303 aluminum alloy. In the step S1, after forming aluminum alloy molten liquid, wrapping hexachloroethane with aluminum foil paper, immersing the aluminum alloy molten liquid in a closed ceramic crucible by a bell jar method, refining at 700-730 ℃ for 8-15 min, then skimming, and cooling to 600-650 ℃ after the skimming is finished. In the step S1, the addition amount of hexachloroethane is 0.2-0.4% of the mass of the ZL303 aluminum alloy ingot. As a preferred scheme of the method for manufacturing the modified ZL303 aluminum alloy, in the step S2, the addition amount of Zr-based amorphous nanocrystalline is 0.1-0.2% of the mass of the ZL303 aluminum alloy ingot. As a preferable scheme of the method for manufacturing the modified ZL303 aluminum alloy, in the step S2, the stirring speed is 150-200 rpm, and the stirring time is 3-8 min. The preparation method of the Zr-based amorphous nanocrystalline alloy modifier in the step S2 comprises the steps of fully mixing ZrTiCuNi amorphous alloy powder with the granularity of 10-30 mu m and Al powder with the granularity of 45-50 mu m according to the mass ratio of (2-4) (6-8) in a ball mill, and then pressing into a cylindrical casting blank, wherein the casting blank is the Zr-based amorphous nanocrystalline alloy modifier. The Zr-based amorphous nanocrystalline alloy regulator is preserved in a vacuum environment. In the step S2, a bell jar method is used for adding Zr-based amorphous nanocrystalline alloy regulator wrapped by aluminum foil paper into aluminum alloy melt in a closed ceramic crucible after slag skimming. In the preferred scheme of the manufacturing method of the modified ZL303 aluminum alloy, in the step S3, the temperature of a steel mold is 100-150 ℃. In order to solve the above technical probl