Preparation method of high-zinc-aluminum alloy profile

Abstract

The invention relates to the technical field of aluminum alloy casting, in particular to a preparation method of a high-zinc aluminum alloy profile, which is characterized by comprising the following steps: step 1, providing Al powder, Cu powder, Mg powder, Zn powder, an aluminum-zirconium intermediate alloy and an Al-Sc intermediate alloy; secondly, Al powder, Cu powder, Mg powder, Zn powder and the aluminum-zirconium intermediate alloy are sequentially heated and smelted and cast into an aluminum alloy ingot, the aluminum alloy ingot is subjected to bipolar homogenizing annealing treatment, and a first aluminum alloy ingot is obtained; thirdly, the aluminum alloy ingot is heated to the first temperature, extrusion deformation treatment is conducted, and a second aluminum alloy ingot is obtained; fourthly, the second aluminum alloy ingot is sequentially subjected to pre-stretching treatment and quenching treatment, and a third aluminum alloy ingot is obtained; fifthly, the third aluminum alloy ingot is sequentially subjected to pre-stretching treatment and solid solution heat treatment, and a fourth aluminum alloy ingot is obtained; and sixthly, the fourth aluminum alloy ingot is sequentially subjected to roller type straightening and artificial aging treatment, and after natural cooling, the high-zinc aluminum alloy profile is obtained. And the stability of the alloy is improved, so that the high-zinc aluminum alloy profile can still keep excellent performance in the long-term use process.

Description

Technical Field

[0001] The invention relates to the technical field of aluminum alloy casting, and in particular to a method for preparing a high-zinc aluminum alloy profile. Background Art

[0002] In the field of aluminum alloy materials, with the continuous development of science and technology and industry, the performance requirements for aluminum alloy profiles are increasing. Although traditional aluminum alloy materials have certain strength and toughness, their performance is often difficult to meet actual needs when used under high stress, high temperature or complex environment. As a new type of alloy material, high zinc aluminum alloy has attracted widespread attention due to its excellent corrosion resistance, high strength and good machinability. However, the preparation process of high zinc aluminum alloy is relatively complicated, and the alloy composition and preparation process need to be strictly controlled to ensure the stability and reliability of its performance.

[0003] In the process of preparing high-zinc aluminum alloy profiles, steps such as melting and casting, extrusion deformation, heat treatment and straightening aging have an important impact on its performance. Traditional melting and casting methods often find it difficult to completely eliminate casting stress, resulting in stress concentration inside the alloy, which affects its mechanical properties and service life. In addition, improper parameter control during the extrusion deformation process may also lead to substandard dimensional accuracy and surface quality of the profile. Therefore, how to improve the excellent performance of the alloy has become an important demand for high-performance aluminum alloy materials in different fields. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a high-zinc aluminum alloy profile in view of the deficiencies in the prior art.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] A high-zinc aluminum alloy profile, characterized in that, by mass percentage, it comprises:

[0007]

[0008]

[0009] A method for preparing the high zinc aluminum alloy profile as described above, characterized in that the steps include:

[0010] Step 1, providing Al powder, Cu powder, Mg powder, Zn powder, aluminum-zirconium master alloy, and Al-Sc master alloy;

[0011] Step 2: heating and smelting Al powder, Cu powder, Mg powder, Zn powder, and aluminum-zirconium master alloy in sequence, and casting them into aluminum alloy ingots, and performing bipolar homogenization annealing treatment on the aluminum alloy ingots to obtain a first aluminum alloy ingot;

[0012] Step 3, heating the aluminum alloy ingot to a first temperature, and performing an extrusion deformation treatment to obtain a second aluminum alloy ingot;

[0013] Step 4: sequentially perform pre-stretching treatment and quenching treatment on the second aluminum alloy ingot to obtain a third aluminum alloy ingot;

[0014] Step 5: sequentially subjecting the third aluminum alloy ingot to a pre-stretching treatment and a solution heat treatment to obtain a fourth aluminum alloy ingot;

[0015] Step 6: The fourth aluminum alloy ingot is subjected to roller straightening and artificial aging treatment in sequence, and after natural cooling, a high-zinc aluminum alloy profile is obtained.

[0016] Preferably, in step 2, the bipolar homogenization annealing treatment includes: heating the aluminum alloy ingot to 420°C-450°C and keeping it for 2h-10h, performing low-temperature precipitation annealing, heating it to 520°C-550°C and keeping it for 2h-10h, and performing high-temperature homogenization annealing to obtain a first aluminum alloy ingot.

[0017] Preferably, in step three, the first temperature is 420°C-450°C.

[0018] Preferably, in step 3, the extrusion deformation treatment includes: preheating the extrusion barrel in the extrusion deformation device to 420°C-450°C,

[0019] The preset mold is preheated to 400℃-420℃, extruded and deformed to a preset shape, and the extruded product is air-cooled at the same time, thus completing the extrusion deformation process;

[0020] Among them, the rotation speed of the extrusion cylinder is 0.5mm / s-0.9mm / s.

[0021] Preferably, in step four, the quenching treatment includes: heating the second aluminum alloy ingot to 730°C-770°C and keeping it warm for 2h-4h. After the insulation is completed, cooling the second aluminum alloy ingot to 300°C-350°C with normal temperature water, and then cooling it to room temperature with an oil cooling medium to complete the quenching treatment.

[0022] Preferably, in step five, the solution heat treatment comprises: pre-stretching the third aluminum alloy ingot, keeping it at 460°C-470°C for 1 hour, and then water-quenching it for less than 20 seconds to obtain a fourth aluminum alloy ingot.

[0023] Preferably, in step six, the artificial aging treatment comprises: after roller straightening the fourth aluminum alloy ingot, keeping it at 120℃-150℃ for 5h-10h, and then heating the fourth aluminum alloy ingot to 150℃-180℃ and keeping it at 14h-18h to obtain a high zinc aluminum alloy profile.

[0024] The present invention adopts the above technical solution, and has the following technical effects compared with the prior art:

[0025] The present invention effectively refines the grains by adding trace amounts of Zr and Cr elements, further enhancing the mechanical properties of the aluminum alloy. In the smelting and casting process, the casting stress in the aluminum alloy ingot is effectively eliminated through bipolar homogenization annealing treatment, and the uniformity of the alloy is improved, which not only provides a good foundation for subsequent extrusion deformation treatment, but also achieves precise forming of the profile by accurately controlling the preheating temperature, extrusion speed and other parameters of the extrusion barrel and the die in the extrusion deformation stage. The pre-stretching treatment, quenching treatment and solution heat treatment in the heat treatment process effectively eliminate the stress inside the profile and improve the strength and toughness of the alloy. In particular, the quenching treatment adopts a combination of normal temperature water and oil cooling media to achieve rapid cooling, further improving the hardness and wear resistance of the alloy. The final roller straightening and artificial aging treatment not only eliminate the residual stress of the profile, but also improve the stability of the alloy, so that the high zinc aluminum alloy profile can still maintain excellent performance during long-term use. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. 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.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0028] The following specific examples further illustrate the present invention but are not intended to limit the present invention.

[0029] Example 1

[0030] A high-zinc aluminum alloy profile, characterized in that, by mass percentage, it comprises:

[0031]

[0032]

[0033] A method for preparing the high zinc aluminum alloy profile as described above, characterized in that the steps include:

[0034] Step 1, providing Al powder, Cu powder, Mg powder, Zn powder, aluminum-zirconium master alloy, and Al-Sc master alloy;

[0035] Step 2: heating and smelting the Al powder, the Cu powder, the Mg powder, the Zn powder, and the aluminum-zirconium master alloy in sequence, and casting them into aluminum alloy ingots, and performing bipolar homogenization annealing treatment on the aluminum alloy ingots;

[0036] The bipolar homogenization annealing treatment comprises: heating the aluminum alloy ingot to 420° C. and keeping the temperature for 2 h to 10 h, performing low temperature precipitation annealing, heating to 520° C. and keeping the temperature for 2 h, and performing high temperature homogenization annealing to obtain the first aluminum alloy ingot;

[0037] Step 3, heating the aluminum alloy ingot to 420° C. and performing extrusion deformation treatment to obtain a second aluminum alloy ingot;

[0038] The extrusion deformation treatment includes: preheating the extrusion barrel in the extrusion deformation device to 420°C-450°C, and setting the rotation speed of the extrusion barrel to 0.5 mm / s;

[0039] The preset mold is preheated to 400°C, extruded and deformed to a preset shape, and the extruded product is air-cooled at the same time, thus completing the extrusion deformation process;

[0040] Step 4: performing a pre-stretching treatment and a quenching treatment on the second aluminum alloy ingot in sequence;

[0041] The quenching treatment comprises: heating the second aluminum alloy ingot to 730° C. and keeping the temperature for 2 hours; after the temperature is kept, cooling the second aluminum alloy ingot to 300° C. by normal temperature water, and then cooling the second aluminum alloy ingot to room temperature by oil cooling medium, thus completing the quenching treatment and obtaining a third aluminum alloy ingot;

[0042] Step 5: sequentially subjecting the third aluminum alloy ingot to a pre-stretching treatment and a solution heat treatment;

[0043] The solution heat treatment comprises: subjecting the third aluminum alloy ingot to the pre-stretching treatment, keeping the temperature at 460° C. for 1 hour, and then performing water cooling quenching within 20 seconds to obtain a fourth aluminum alloy ingot;

[0044] Step 6: performing roller straightening and artificial aging treatment on the fourth aluminum alloy ingot in sequence;

[0045] The artificial aging treatment comprises: after roller straightening the fourth aluminum alloy ingot, keeping it at 120°C for 5 hours, then heating the fourth aluminum alloy ingot to 150°C and keeping it at 14 hours, and after natural cooling, obtaining a high-zinc aluminum alloy profile.

[0046] Example 2

[0047] A high-zinc aluminum alloy profile, characterized in that, by mass percentage, it comprises:

[0048]

[0049] A method for preparing the high zinc aluminum alloy profile as described above, characterized in that the steps include:

[0050] Step 1, providing Al powder, Cu powder, Mg powder, Zn powder, aluminum-zirconium master alloy, and Al-Sc master alloy;

[0051] Step 2: heating and smelting the Al powder, the Cu powder, the Mg powder, the Zn powder, and the aluminum-zirconium master alloy in sequence, and casting them into aluminum alloy ingots, and performing bipolar homogenization annealing treatment on the aluminum alloy ingots;

[0052] The bipolar homogenization annealing treatment comprises: heating the aluminum alloy ingot to 450° C. and keeping the temperature for 10 hours, performing low-temperature precipitation annealing, heating to 550° C. and keeping the temperature for 10 hours, and performing high-temperature homogenization annealing to obtain the first aluminum alloy ingot;

[0053] Step 3, heating the aluminum alloy ingot to 450° C. and performing extrusion deformation treatment to obtain a second aluminum alloy ingot;

[0054] The extrusion deformation treatment includes: preheating the extrusion barrel in the extrusion deformation device to 450° C., and setting the rotation speed of the extrusion barrel to 0.9 mm / s;

[0055] The preset mold is preheated to 420°C, extruded and deformed to a preset shape, and the extruded product is air-cooled at the same time, thus completing the extrusion deformation process;

[0056] Step 4: sequentially subjecting the second aluminum alloy ingot to a pre-stretching treatment and a quenching treatment;

[0057] The quenching treatment comprises: heating the second aluminum alloy ingot to 770° C. and keeping the temperature for 4 hours; after the temperature is kept, cooling the second aluminum alloy ingot to 350° C. by normal temperature water, and then cooling the second aluminum alloy ingot to room temperature by oil cooling medium, thus completing the quenching treatment and obtaining a third aluminum alloy ingot;

[0058] Step 5: sequentially subjecting the third aluminum alloy ingot to a pre-stretching treatment and a solution heat treatment;

[0059] The solution heat treatment comprises: subjecting the third aluminum alloy ingot to the pre-stretching treatment, keeping the temperature at 470° C. for 1 hour, and then water-cooling quenching for less than 20 seconds to obtain a fourth aluminum alloy ingot;

[0060] Step 6: performing roller straightening and artificial aging treatment on the fourth aluminum alloy ingot in sequence;

[0061] The artificial aging treatment comprises: roller straightening the fourth aluminum alloy ingot and keeping it at 150°C for 10 hours, then heating the fourth aluminum alloy ingot to 180°C and keeping it at 18 hours, and naturally cooling it to obtain a high-zinc aluminum alloy profile.

[0062] In summary, the present invention effectively refines the grains by adding trace amounts of Zr and Cr elements, further enhancing the mechanical properties of the aluminum alloy. During the smelting and casting process, the casting stress in the aluminum alloy ingot is effectively eliminated through bipolar homogenization annealing treatment, and the uniformity of the alloy is improved, which not only provides a good foundation for the subsequent extrusion deformation treatment, but also achieves precise forming of the profile by accurately controlling the preheating temperature, extrusion speed and other parameters of the extrusion barrel and the die during the extrusion deformation stage. The pre-stretching treatment, quenching treatment and solution heat treatment during the heat treatment process effectively eliminate the stress inside the profile and improve the strength and toughness of the alloy. In particular, the quenching treatment adopts a combination of room temperature water and oil cooling media to achieve rapid cooling, further improving the hardness and wear resistance of the alloy. The final roller straightening and artificial aging treatment not only eliminate the residual stress of the profile, but also improve the stability of the alloy, so that the high zinc aluminum alloy profile can still maintain excellent performance during long-term use.

[0063] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the contents of the specification of the present invention should be included in the protection scope of the present invention.

Claims

1. A high zinc aluminum alloy profile, characterized in that: In terms of mass percentage, it includes:

2. A method for preparing a high zinc aluminum alloy profile as claimed in claim 1, characterized in that the steps include: Step 1, providing Al powder, Cu powder, Mg powder, Zn powder, aluminum-zirconium master alloy, and Al-Sc master alloy; Step 2: heating and smelting the Al powder, the Cu powder, the Mg powder, the Zn powder, and the aluminum-zirconium master alloy in sequence, and casting them into an aluminum alloy ingot, and performing a bipolar homogenization annealing treatment on the aluminum alloy ingot to obtain a first aluminum alloy ingot; Step 3, heating the aluminum alloy ingot to a first temperature, and performing an extrusion deformation treatment to obtain a second aluminum alloy ingot; Step 4: sequentially perform pre-stretching treatment and quenching treatment on the second aluminum alloy ingot to obtain a third aluminum alloy ingot; Step 5: sequentially subjecting the third aluminum alloy ingot to a pre-stretching treatment and a solution heat treatment to obtain a fourth aluminum alloy ingot; Step 6: subjecting the fourth aluminum alloy ingot to roller straightening and artificial aging treatment in sequence, and obtaining a high-zinc aluminum alloy profile after natural cooling.

3. The method for preparing a high zinc aluminum alloy profile according to claim 2, characterized in that: In the step 2, the bipolar homogenization annealing treatment includes: heating the aluminum alloy ingot to 420°C-450°C and keeping it for 2h-10h, performing low-temperature precipitation annealing, heating to 520°C-550°C and keeping it for 2h-10h, and performing high-temperature homogenization annealing to obtain the first aluminum alloy ingot.

4. The method for preparing a high zinc aluminum alloy profile according to claim 2, characterized in that: In the step three, the first temperature is 420°C-450°C.

5. The method for preparing a high zinc aluminum alloy profile according to claim 2, characterized in that: In the step 3, the extrusion deformation treatment includes: preheating the extrusion barrel in the extrusion deformation device to 420°C-450°C, preheating the preset mold to 400°C-420°C, extruding and deforming to a preset shape, and air cooling the extruded product, thereby completing the extrusion deformation treatment; Among them, the rotation speed of the extrusion cylinder is 0.5mm / s-0.9mm / s.

6. The method for preparing a high zinc aluminum alloy profile according to claim 2, characterized in that: In the step 4, the quenching treatment includes: heating the second aluminum alloy ingot to 730°C-770°C and keeping it warm for 2h-4h. After the insulation is completed, cooling the second aluminum alloy ingot to 300°C-350°C with normal temperature water, and then cooling it to room temperature with an oil cooling medium to complete the quenching treatment.

7. The method for preparing a high zinc aluminum alloy profile according to claim 2, characterized in that: In the step five, the solution heat treatment comprises: subjecting the third aluminum alloy ingot to the pre-stretching treatment, keeping the ingot at 460° C.-470° C. for 1 hour, and then performing water cooling quenching for less than 20 seconds to obtain a fourth aluminum alloy ingot.

8. The method for preparing a high zinc aluminum alloy profile according to claim 2, characterized in that: In the step six, the artificial aging treatment includes: after roller straightening the fourth aluminum alloy ingot, keeping it warm at 120℃-150℃ for 5h-10h, and then heating the fourth aluminum alloy ingot to 150℃-180℃ and keeping it warm for 14h-18h to obtain a high zinc aluminum alloy profile.

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