Al-Mg-Mn-Sc aluminum alloy, preparation of Al-Mg-Mn-Sc aluminum alloy and preparation method of Al-Mg-Mn-Sc aluminum alloy profile

Abstract

The invention provides an Al-Mg-Mn-Sc aluminum alloy. The Al-Mg-Mn-Sc aluminum alloy is prepared from 0.30%-1.00% of Mn, 3.20%-4.80% of Mg, 0.05%-0.15% of Cr, 0.05%-0.15% of Ti, 0.05%-0.15% of Zr, 0.15%-0.25% of Sc and the balance Al. The invention further provides a preparation method of the Al-Mg-Mn-Sc aluminum alloy profile, and the preparation method comprises the steps that an Al-Mg-Mn-Sc aluminum alloy cast ingot is heated and then extruded, and an aluminum alloy extruded part is obtained; and the aluminum alloy extrusion part is stretched, and the Al-Mg-Mn-Sc aluminum alloy profile is obtained. According to the Al-Mg-Mn-Sc aluminum alloy profile, the Sc element is introduced, and the extrusion process and the stretching process are controlled at the same time, so that the tensile strength, the yield strength and the ductility of the Al-Mg-Mn-Sc aluminum alloy profile are improved, and the requirements of customers are met.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloys, and in particular to an Al-Mg-Mn-Sc aluminum alloy, a product thereof and a preparation method of an Al-Mg-Mn-Sc aluminum alloy profile. Background Art

[0002] Among aluminum alloys, Al-Mg-Mn (5xxx series) alloys are non-heat-treatable strengthening alloy series, and the strength of their alloy profile products is not very high. For example, the 5A06 alloy with the highest strength among Al-Mg-Mn (5xxx series) alloys in the existing national standard for aluminum alloy profiles GB / T6892-2015 has a tensile strength of greater than or equal to 315MPa, a yield strength of greater than or equal to 160MPa, and an elongation of greater than or equal to 13%. At the same time, the actual strength values ​​of 5A06 alloy profiles are statistically analyzed, as shown in Table 1;

[0003] Table 1 Performance data of 5A06 aluminum alloy profiles

[0004]

[0005] At present, customers require Al-Mg-Mn (5xxx series) alloy profiles with better welding performance, and require tensile strength greater than or equal to 320MPa, yield strength greater than or equal to 280MPa, and elongation greater than or equal to 12%. Based on the mechanical properties of the above 5A06 alloy profiles, although the tensile strength and elongation are comparable to customer requirements, the yield strength value is far from customer demand.

[0006] Therefore, there is an urgent need to provide an Al-Mg-Mn aluminum alloy whose tensile strength, yield strength and elongation all meet customer requirements. Summary of the invention

[0007] The technical problem solved by the present invention is to provide a method for preparing an Al-Mg-Mn-Sc aluminum alloy profile. The aluminum alloy profile prepared in the present application can be improved in terms of tensile strength, yield strength and elongation to meet customer needs.

[0008] In view of this, the present application provides an Al-Mg-Mn-Sc aluminum alloy, which comprises, by mass percentage:

[0009] Mn 0.30~1.00%, Mg 3.20~4.80%, Cr 0.05~0.15%, Zn 0.05~0.15%, Ti0.05~0.15%, Zr 0.05~0.15%, Sc 0.15~0.25%, Si≤0.08%, Fe≤0.10%, Cu≤0.10%, Al balance.

[0010] Preferably, the content of Sc is 0.18-0.22%.

[0011] Preferably, the Mg content is 3.5-4.5%.

[0012] Preferably, the Ti content is 0.08-0.12%.

[0013] The present application also provides an Al-Mg-Mn-Sc aluminum alloy product, which is prepared from the Al-Mg-Mn-Sc aluminum alloy.

[0014] The present application also provides a method for preparing an Al-Mg-Mn-Sc aluminum alloy profile, comprising the following steps:

[0015] The Al-Mg-Mn-Sc aluminum alloy ingot is heated and then extruded to obtain an Al-Mg-Mn-Sc aluminum alloy extrusion; the composition of the Al-Mg-Mn-Sc aluminum alloy ingot, measured by mass percentage, includes: Mn 0.30-1.00%, Mg 3.20-4.80%, Cr 0.05-0.15%, Zn 0.05-0.15%, Ti 0.05-0.15%, Zr 0.05-0.15%, Sc0.15-0.25%, Si≤0.08%, Fe≤0.10%, Cu≤0.10%, and Al balance;

[0016] Stretching the Al-Mg-Mn-Sc aluminum alloy extrusion to obtain an Al-Mg-Mn-Sc aluminum alloy profile;

[0017] The heating temperature is 450-510°C, and the extrusion barrel temperature is 440-480°C.

[0018] Preferably, the extrusion speed is 0.5-2.0 m / min, and the stretching ratio is 2%-5%.

[0019] Preferably, the heating temperature is 470-490°C, and the extrusion barrel temperature is 450-470°C.

[0020] Preferably, the extrusion speed is 0.8-1.2 m / min, and the stretching ratio is 2-4%.

[0021] Preferably, the aluminum alloy profile has a tensile strength greater than or equal to 320 MPa, a yield strength greater than or equal to 280 MPa, and an elongation greater than or equal to 12%.

[0022] The present application provides a method for preparing an Al-Mg-Mn-Sc aluminum alloy profile, which comprises firstly heating an Al-Mg-Mn-Sc aluminum alloy ingot and then extruding the ingot to obtain an Al-Mg-Mn-Sc aluminum alloy extrusion; then stretching the aluminum alloy extrusion to obtain an Al-Mg-Mn-Sc aluminum alloy profile; in the method for preparing an Al-Mg-Mn-Sc aluminum alloy profile provided in the present application, firstly adding a Sc element to the aluminum alloy ingot, and then combining the precisely controlled extrusion barrel temperature, extrusion speed and stretching rate, thereby improving the tensile strength, yield strength and elongation of the aluminum alloy profile and meeting customer needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a physical photo of the Al-Mg-Mn-Sc aluminum alloy extrusion prepared in Example 1 of the present invention;

[0024] Figure 2 This is a physical photo of the Al-Mg-Mn-Sc aluminum alloy profile prepared in Example 1 of the present invention;

[0025] Figure 3 This is a physical photo 1 of the Al-Mg-Mn-Sc aluminum alloy profile prepared in Comparative Example 1 of the present invention;

[0026] Figure 4 A physical photo 2 of the Al-Mg-Mn-Sc aluminum alloy profile prepared in Comparative Example 1 of the present invention;

[0027] Figure 5 A physical photograph 1 of the Al-Mg-Mn-Sc aluminum alloy profile prepared in Comparative Example 2 of the present invention;

[0028] Figure 6 This is a physical photo 2 of the Al-Mg-Mn-Sc aluminum alloy profile prepared in Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0029] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0030] In view of the problem that the tensile strength, yield strength and elongation of Al-Mg-Mn aluminum alloy profiles in the prior art cannot meet the needs of customers, the present application provides an Al-Mg-Mn-Sc aluminum alloy and a method for preparing the aluminum alloy profile. The aluminum alloy profile prepared in the present application is improved in tensile strength, yield strength and elongation, meeting the needs of customers. Specifically, the embodiment of the present invention discloses an Al-Mg-Mn-Sc aluminum alloy, which comprises, by mass percentage:

[0031] Mn 0.30~1.00%, Mg 3.20~4.80%, Cr 0.05~0.15%, Zn 0.05~0.15%, Ti0.05~0.15%, Zr 0.05~0.15%, Sc 0.15~0.25%, Si≤0.08%, Fe≤0.10%, Cu≤0.10%, Al balance.

[0032] In the Al-Mg-Mn-Sc aluminum alloy provided in the present application, the content of Mn is 0.30% to 1.00%, specifically, the content of Mn is 0.35% to 0.85%, more specifically, the content of Mn is 0.48% to 0.72%; for example, the content of Mn in the present application is 0.32%, 0.36%, 0.38%, 0.40%, 0.42%, 0.45%, 0.49%. , 0.51%, 0.52%, 0.55%, 0.58%, 0.60%, 0.62%, 0.65%, 0.67%, 0.69%, 0.71%, 0.72%, 0.73%, 0.75%, 0.76%, 0.77%, 0.81%, 0.82%, 0.86%, 0.90%, 0.91%, 0.93%, 0.95%, 0.96%.

[0033] The content of Mg is 3.20% to 4.80%, specifically, the content of Mg is 3.50% to 4.50%, more specifically, the content of Mg is 3.80% to 4.20%; for example, the content of Mg in the present application is 3.30%, 3.38%, 3.40%, 3.42%, 3.53%, 3.60%, 3.63%, 3.66%, 3.70%, 3.72%, 3.78%. , 3.81%, 3.84%, 3.88%, 3.92%, 3.96%, 4.05%, 4.07%, 4.12%, 4.15%, 4.18%, 4.20%, 4.25%, 4.30%, 4.36%, 4.38%, 4.40%, 4.46%, 4.52%, 4.57%, 4.63%, 4.68%, 4.70%, 4.76%.

[0034] The Cr content is 0.05-0.15%, specifically, the Cr content is 0.06-0.12%, more specifically, the Cr content is 0.07-0.10%; for example, the Cr content in this application is 0.08%, 0.09%, 0.11%, 0.13%, and 0.14%.

[0035] The Zn content is 0.05-0.15%, specifically, the Zn content is 0.06-0.12%, more specifically, the Zn content is 0.07-0.10%; for example, the Zn content in this application is 0.08%, 0.09%, 0.11%, 0.13%, and 0.14%.

[0036] The Ti content is 0.05-0.15%, specifically, the Ti content is 0.08-0.12%; for example, the Ti content in this application is 0.06%, 0.07%, 0.09%, 0.10%, 0.11%, 0.13%, and 0.14%.

[0037] The Zr content is 0.05-0.15%, specifically, the Zr content is 0.08-0.12%; for example, the Zr content in this application is 0.06%, 0.07%, 0.09%, 0.10%, 0.11%, 0.13%, and 0.14%.

[0038] The content of Sc is 0.15-0.25%, specifically, the content of Sc is 0.18-0.22%; for example, the content of Sc in this application is 0.16%, 0.17%, 0.19%, 0.20%, 0.21%, 0.23%, and 0.24%.

[0039] Si≤0.08%, specifically, Si≤0.05%, more specifically, Si≤0.03%.

[0040] Fe≤0.10%, specifically, Fe≤0.08%, more specifically, Fe≤0.05%.

[0041] Cu≤0.10%, specifically, Cu≤0.07%, more specifically, Cu≤0.04%.

[0042] Furthermore, the present application also provides an Al-Mg-Mn-Sc aluminum alloy product, which is prepared from the Al-Mg-Mn-Sc aluminum alloy described in the above scheme.

[0043] In the present application, the Al-Mg-Mn-Sc aluminum alloy product is an Al-Mg-Mn-Sc aluminum alloy product well known to those skilled in the art, and can be an aluminum alloy pipe, an aluminum alloy profile, or an aluminum alloy plate. The composition of the above-mentioned product is the specific composition of the above-mentioned aluminum alloy.

[0044] The present application also provides a method for preparing an Al-Mg-Mn-Sc aluminum alloy profile, comprising the following steps:

[0045] The Al-Mg-Mn-Sc aluminum alloy ingot is heated and then extruded to obtain an Al-Mg-Mn-Sc aluminum alloy extrusion; the composition of the Al-Mg-Mn-Sc aluminum alloy ingot, measured by mass percentage, includes: Mn 0.30-1.00%, Mg 3.20-4.80%, Cr 0.05-0.15%, Zn 0.05-0.15%, Ti 0.05-0.15%, Zr 0.05-0.15%, Sc0.15-0.25%, Si≤0.08%, Fe≤0.10%, Cu≤0.10%, and Al balance;

[0046] Stretching the Al-Mg-Mn-Sc aluminum alloy extrusion to obtain an Al-Mg-Mn-Sc aluminum alloy profile;

[0047] The heating temperature is 450-510°C, and the extrusion barrel temperature is 440-480°C.

[0048] In the preparation process of Al-Mg-Mn-Sc aluminum alloy profiles, the present application first heats the Al-Mg-Mn-Sc aluminum alloy ingot; the preparation method of the Al-Mg-Mn-Sc aluminum alloy ingot is prepared according to a method well known to those skilled in the art, and the present application has no special restrictions on this; the heating temperature is 450-510°C, specifically, the heating temperature is 455°C, 460°C, 465°C, 470°C, 480°C, 485°C, 490°C, 495°C, 500°C, and 505°C.

[0049] According to the present invention, the heated aluminum alloy ingot is then extruded. The specific process of the extrusion is well known to those skilled in the art, and this application does not impose any particular restrictions on this. The extrusion barrel temperature of the extrusion is 440-480°C, and the extrusion speed is 0.5-2.0 m / min. Specifically, the extrusion barrel temperature of the extrusion is 450-470°C, and the extrusion speed is 0.8-1.2 m / min. For example, the extrusion barrel temperature in this application is 445°C, 452 ℃, 455℃, 460℃, 463℃, 466℃, 468℃, 470℃, 472℃, 476℃, 478℃, 479℃, and the extrusion speed is 0.6m / min, 0.7m / min, 0.9m / min, 1.0m / min, 1.1m / min, 1.3m / min, 1.4m / min, 1.5m / min, 1.6m / min, 1.7m / min, 1.8m / min, 1.9m / min. Since the strength requirements of Al-Mg-Mn-Sc aluminum alloy profiles are relatively high, the extrusion forming quality and performance strength of the aluminum alloy profiles can be better improved by controlling the extrusion temperature and extrusion speed; therefore, the heating temperature, the extrusion barrel temperature and the extrusion speed within the above range are beneficial to improving the forming quality and strength of the Al-Mg-Mn-Sc aluminum alloy profiles.

[0050] The present application finally stretches the Al-Mg-Mn-Sc aluminum alloy extrusion to obtain an Al-Mg-Mn-Sc aluminum alloy profile; the above stretching ensures the straightness and curvature of the profile by controlling the stretching rate, and the residual stress inside the profile can be eliminated by stretching to obtain higher performance strength. The stretching rate of the stretching is 2 to 5%, specifically, the stretching rate of the stretching is 2.2%, 2.5%, 2.8%, 3.0%, 3.2%, 3.4%, 3.5%, 3.7%, 3.8%, 4.0%, 4.2%, 4.3%, 4.6%, 4.8%; the stretching rate is controlled within the above range to ensure the straightness and curvature of the profile, and can further ensure the tensile strength, yield strength and elongation.

[0051] The present invention provides a method for preparing an Al-Mg-Mn-Sc aluminum alloy profile, which introduces the Sc element and controls the extrusion process and the stretching process to obtain a profile whose straightness and curvature meet the needs of users, and at the same time ensures that the tensile strength of the profile is greater than or equal to 320MPa, the yield strength is greater than or equal to 280MPa, and the elongation is greater than or equal to 12%. The method provided by the present invention solves the problem of the blank process of the new Al-Mg-Mn-Sc alloy extrusion profile, and lays a foundation for the future expansion of the alloy extrusion profile process.

[0052] In order to further understand the present invention, the preparation method of the Al-Mg-Mn-Sc aluminum alloy profile provided by the present invention is described in detail below in conjunction with the embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0053] Example 1

[0054] The Al-Mg-Mn-Sc aluminum alloy ingot with the composition shown in Table 2 was heated to 480±10°C and then placed in an extrusion barrel for extrusion. The temperature of the extrusion barrel was 460±10°C and the extrusion speed was 1.0±0.2m / min to obtain an Al-Mg-Mn-Sc aluminum alloy extrusion. The actual photo is shown in Figure 1 As shown;

[0055] The Al-Mg-Mn-Sc aluminum alloy extrusion was stretched with a stretching rate of 3%±1% to obtain an Al-Mg-Mn-Sc aluminum alloy profile. The actual photo is shown in Figure 2 As shown;

[0056] The Al-Mg-Mn-Sc aluminum alloy profiles were subjected to performance testing and finally straightened; the test results are shown in Table 3;

[0057] Table 2 Chemical composition data of Al-Mg-Mn-Sc aluminum alloy (wt%)

[0058]

[0059] Table 3 Performance data of Al-Mg-Mn-Sc aluminum alloy profiles with different processing batches

[0060]

[0061]

[0062] Comparative Example 1

[0063] The preparation method of Al-Mg-Mn-Sc aluminum alloy profile is the same as that of Example 1, except that the extrusion barrel temperature is 400°C. The photo of the obtained aluminum alloy profile is as shown in FIG. Figure 3 As shown;

[0064] The preparation method of Al-Mg-Mn-Sc aluminum alloy profile is the same as that of Example 1, except that the extrusion barrel temperature is 500°C. The photo of the obtained aluminum alloy profile is as shown in FIG. Figure 4 shown.

[0065] Depend on Figure 3 and Figure 4 It can be seen that if the extrusion temperature is too low, the aluminum alloy profile will be difficult to extrude, the molding quality will be poor, defects will easily occur, and even the problem of being unable to extrude will occur. If the extrusion temperature is too high, the aluminum alloy will easily have extrusion cracks, increasing the scrap rate.

[0066] Comparative Example 2

[0067] The preparation method of Al-Mg-Mn-Sc aluminum alloy profile is the same as that of Example 1, except that the elongation rate is 1.5%. The photo of the obtained aluminum alloy profile is as shown in FIG. Figure 5 The performance test results are shown in Table 4;

[0068] The preparation method of Al-Mg-Mn-Sc aluminum alloy profile is the same as that of Example 1, except that the elongation rate is 5.5%. The photo of the obtained aluminum alloy profile is shown in FIG. Figure 6 shown.

[0069] Table 4 Performance data of aluminum alloy profiles prepared in Comparative Example 2

[0070]

[0071]

[0072] Depend on Figure 5 , Figure 6 As shown in Table 4, if the elongation rate is too low, the aluminum alloy profile cannot be straightened, the straightness of the profile cannot be guaranteed, and the profile performance cannot meet user requirements; if the elongation rate is too high, the profile is easy to break and safety accidents are prone to occur.

[0073] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0074] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An Al-Mg-Mn-Sc aluminum alloy, comprising, by mass percentage: Mn 0.30~1.00%, Mg 3.20~4.80%, Cr 0.05~0.15%, Zn 0.05~0.15%, Ti0.05~0.15%, Zr 0.05~0.15%, Sc 0.15~0.25%, Si≤0.08%, Fe≤0.10%, Cu≤0.10%, Al balance.

2. The Al-Mg-Mn-Sc aluminum alloy according to claim 1, characterized in that: The Sc content is 0.18-0.22%.

3. The Al-Mg-Mn-Sc aluminum alloy according to claim 1, characterized in that: The Mg content is 3.5-4.5%.

4. The Al-Mg-Mn-Sc aluminum alloy according to claim 1, characterized in that: The Ti content is 0.08-0.12%.

5. An Al-Mg-Mn-Sc aluminum alloy product, prepared from the Al-Mg-Mn-Sc aluminum alloy according to any one of claims 1 to 4.

6. A method for preparing an Al-Mg-Mn-Sc aluminum alloy profile, comprising the following steps: The Al-Mg-Mn-Sc aluminum alloy ingot is heated and then extruded to obtain an Al-Mg-Mn-Sc aluminum alloy extrusion; The composition of the Al-Mg-Mn-Sc aluminum alloy ingot is measured by mass percentage, including: Mn 0.30-1.00%, Mg 3.20-4.80%, Cr 0.05-0.15%, Zn 0.05-0.15%, Ti 0.05-0.15%, Zr 0.05-0.15%, Sc0.15-0.25%, Si≤0.08%, Fe≤0.10%, Cu≤0.10%, and Al balance; Stretching the Al-Mg-Mn-Sc aluminum alloy extrusion to obtain an Al-Mg-Mn-Sc aluminum alloy profile; The heating temperature is 450-510°C, and the extrusion barrel temperature is 440-480°C.

7. The preparation method according to claim 6, characterized in that: The extrusion speed is 0.5-2.0 m / min, and the stretching rate is 2%-5%.

8. The preparation method according to claim 6, characterized in that: The heating temperature is 470-490°C, and the extrusion barrel temperature is 450-470°C.

9. The preparation method according to claim 7, characterized in that: The extrusion speed is 0.8-1.2 m / min, and the stretching rate is 2-4%.

10. The preparation method according to any one of claims 6 to 9, characterized in that: The aluminum alloy profile has a tensile strength greater than or equal to 320 MPa, a yield strength greater than or equal to 280 MPa, and an elongation greater than or equal to 12%.

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