Aluminum alloy and ultrasonic quenching treatment method thereof

Abstract

The invention belongs to the technical field of aluminum alloy preparation, and particularly relates to an aluminum alloy and an ultrasonic quenching treatment method thereof.The ultrasonic quenching treatment method of the aluminum alloy comprises the steps that a supersaturated solid solution obtained after solution treatment of the aluminum alloy is subjected to quenching treatment; the aluminum alloy subjected to quenching treatment is subjected to intermittent ultrasonic treatment, and it is ensured that the aluminum alloy makes close contact with an ultrasonic probe in the ultrasonic treatment process; and the aluminum alloy subjected to intermittent ultrasonic treatment is subjected to aging treatment and then air-cooled to the room temperature. According to the ultrasonic quenching treatment method for the aluminum alloy, the problems that a traditional heat treatment process is high in cost, large in energy consumption and long in consumed time, and the comprehensive performance of the aluminum alloy cannot be fully exerted can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum alloy preparation, and particularly relates to an aluminum alloy and an ultrasonic quenching treatment method thereof. Background Art

[0002] Aluminum alloy is a metal material widely used in aerospace, transportation (automobiles, high-speed rail), construction and other fields. It has the characteristics of high specific strength, good corrosion resistance, and excellent thermal and electrical conductivity. Heat treatment is an important means to improve the mechanical properties of aluminum alloys such as tensile strength, yield strength, and elongation. However, traditional heat treatment processes have the natural disadvantages of high cost, high energy consumption, long time consumption, and inability to fully exert the comprehensive performance of aluminum alloys. This greatly limits the application of aluminum alloys in high-end structural parts.

[0003] Therefore, the existing aluminum alloys and their preparation processes still need to be improved. Summary of the invention

[0004] The purpose of the present invention is to provide an aluminum alloy and an ultrasonic quenching treatment method thereof, so as to improve the problems of high cost, high energy consumption, long time consumption and inability to fully exert the comprehensive properties of the aluminum alloy in the traditional heat treatment process.

[0005] The first aspect of the present invention provides an ultrasonic quenching treatment method for aluminum alloys, the ultrasonic quenching treatment method comprising: quenching a supersaturated solid solution obtained after solution treatment of the aluminum alloy; and intermittently ultrasonically treating the aluminum alloy after the quenching treatment, and ensuring that the aluminum alloy is in close contact with the ultrasonic probe during the ultrasonic treatment; and aging the aluminum alloy after the intermittent ultrasonic treatment, and then air cooling to room temperature.

[0006] In some embodiments of the present invention, the temperature of the aging treatment is 120° C. to 165° C., and the time of the aging treatment is 3 h to 8 h.

[0007] In some embodiments of the present invention, the temperature of the aging treatment is 120° C. to 150° C., and the time of the aging treatment is 3 h to 5 h.

[0008] In some embodiments of the present invention, in the intermittent ultrasonic treatment, the ultrasonic power is 0.3 kw to 2.5 kw each time, the ultrasonic time is 5 min to 20 min each time, and the ultrasonic interval time is 5 min to 20 min.

[0009] In some embodiments of the present invention, the number of ultrasonications in the intermittent ultrasonic treatment is 1 to 10 times.

[0010] In some embodiments of the present invention, the number of ultrasonications in the intermittent ultrasonic treatment is 3 to 8 times.

[0011] In some embodiments of the present invention, the quenching treatment is performed at a temperature of 45°C to 75°C.

[0012] In some embodiments of the present invention, the supersaturated solid solution is subjected to the quenching treatment within 12 s.

[0013] In some embodiments of the present invention, the temperature of the solution treatment is 490° C. to 550° C., and the time of the solution treatment is 6 h to 12 h.

[0014] The second aspect of the present invention further provides an aluminum alloy, which is produced by the ultrasonic quenching method described in the first aspect.

[0015] In some embodiments of the present invention, the aluminum alloy has a tensile strength of 317 MPa to 357 MPa, a yield strength of 249 MPa to 304.5 MPa, and an elongation of 2.3% to 5.13%.

[0016] The process of strengthening phase formation is: atomic enrichment → GP zone → intermediate metastable phase → strengthening phase.

[0017] The period when atomic enrichment occurs is: after the aluminum alloy is solution treated and quenched, the atoms begin to migrate and enrich during the static process at room temperature.

[0018] The formation period of GP zone is: after atomic migration is enriched to a certain extent, GP zone is formed (Note: GP zone will be formed during this period and during aging treatment).

[0019] The formation period of the intermediate metastable phase and the strengthening phase: During the aging treatment, the GP zone formed will continue to grow to form a metastable phase, and the metastable phase will continue to grow to form a strengthening phase.

[0020] From the above-mentioned strengthening phase formation process, it can be seen that the GP zone is the predecessor of the strengthening phase formation. Therefore, the more and more dispersed the GP zones formed in the early stage, the more and more dispersed the strengthening phases formed in the later stage, and the more and more dispersed the strengthening phases, the better the mechanical properties of the aluminum alloy. The number and dispersion of the GP zone are related to the temperature. The lower the temperature, the more GP zones are formed and the better the dispersion. The high temperature during aging treatment (generally >160℃) is not conducive to the formation of a large number of dispersed GP zones. However, although the lower temperature is conducive to the formation of a large number of dispersed GP zones, the atomic migration rate is slow at this time, and the formation time of the GP zone is long (even decades). Therefore, ultrasonic treatment of aluminum alloy at low temperature (generally room temperature) can effectively improve the migration energy of atoms in the aluminum alloy, which is conducive to the rapid, large and dispersed formation of GP zones, and then conducive to the formation of strengthening phases in the later stage.

[0021] In addition, long-term high-temperature aging treatment will cause the grain size of the aluminum alloy to grow to varying degrees. The growth of the grain size will reduce the comprehensive mechanical properties of the aluminum alloy. The use of ultrasonic treatment on the quenched aluminum alloy can form a large number of GP zones at this stage, which can effectively shorten the temperature and time of subsequent aging treatment, avoid the growth of the grain size, and help improve the comprehensive mechanical properties of the aluminum alloy.

[0022] The invention performs ultrasonic treatment on aluminum alloy at room temperature, has good feasibility and has low requirements on high temperature resistance of ultrasonic generator equipment.

[0023] The present invention utilizes ultrasonic treatment to enhance the migration energy of atoms, which is beneficial to promoting the formation of a large number of diffuse GP zones at room temperature.

[0024] The present invention reduces the temperature and time of aging treatment, thereby preventing the growth of the aluminum alloy grain size and improving the comprehensive mechanical properties of the aluminum alloy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a flow chart of the ultrasonic quenching treatment method of aluminum alloy in an embodiment of the present invention; Figure 2 Schematic diagram of the operation of ultrasonic treatment in an embodiment of the present invention.

[0027] Description of reference numerals: 1-Aluminum alloy specimen, 2-Ultrasonic probe. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0029] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0030] In the description of the embodiments of the present invention, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In the description of the embodiments of the present invention, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0033] In the description of the embodiments of the present invention, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0034] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0035] Some terms in the present invention are explained below to facilitate understanding by those skilled in the art.

[0036] Solid solution: refers to the alloy phase in which the solute atoms are dissolved in the solvent lattice while still maintaining the solvent type. The element atoms with a higher content in this phase are called solvent atoms, and the element atoms with a lower content are called solute atoms.

[0037] Solution treatment: refers to the treatment method of heating the alloy to a high temperature single-phase region and maintaining it at a constant temperature so that the strengthening phase in the alloy is completely dissolved into the matrix to form a supersaturated solid solution.

[0038] Quenching treatment: refers to the treatment method of maintaining the supersaturated solid solution formed after solution treatment at room temperature by rapid cooling (usually water cooling).

[0039] Aging treatment: refers to the heat treatment process in which the alloy is placed at a higher temperature for a period of time after solution treatment and quenching treatment, so that its properties change over time.

[0040] Ultrasonic treatment: It is a technology that uses the vibration and cavitation of ultrasound to change or accelerate the change of certain physical, chemical, biological properties or states of matter.

[0041] Strengthening phase: refers to the phase structure formed when the material undergoes a specific process (such as heat treatment) and has the effect of improving the mechanical properties of the material.

[0042] GP zone: refers to the element enrichment zone inside the material before the elements form the strengthening phase.

[0043] In the magnesium alloy heat treatment method combined with high-energy ultrasonic treatment disclosed in the prior art, the magnesium alloy is placed under the end of the high-energy ultrasonic horn, and then placed in an oil medium at a certain temperature for heating, solid solution treatment for a period of time, and high-energy ultrasound of different powers is applied at the same time, and then quenching treatment is performed in an oil medium at a certain temperature, and then the magnesium alloy is placed under the end of the high-energy ultrasonic horn, placed in an oil medium at a certain temperature for heating, aging treatment for a period of time, and high-energy ultrasound of different powers is applied at the same time; after the aging and ultrasonic treatment are completed, the adjustment bolt is loosened, and the sample is removed and air-cooled to room temperature. This technical process is simple and improves the performance of the magnesium alloy to a certain extent.

[0044] Currently, the cost of heat treatment of aluminum alloys is relatively high (high temperature and long-term treatment are required), and traditional heat treatment processes are difficult to stimulate the optimal performance of the alloy, which greatly limits the application of aluminum alloys in high-end structural parts.

[0045] The high-strength and high-plasticity age-hardened alloy and its ultrasonic aging treatment method disclosed in the prior art provide a process method for multiple heat treatments and cold deformation treatments. The specific operations are as follows: conventional aging treatment is performed on the age-hardened alloy after conventional solid solution treatment and cold plastic deformation; secondary solid solution treatment is performed on the age-hardened alloy, and then quenching is performed; secondary cold plastic deformation is performed on the age-hardened alloy; secondary aging treatment is performed on the age-hardened alloy; ultrasonic aging treatment is performed on the age-hardened alloy, thereby obtaining a high-strength and high-plasticity age-hardened alloy.

[0046] However, the prior art still has the following disadvantages: (1) Poor feasibility and high cost: The treatment methods disclosed in the above-mentioned prior art are to perform ultrasonic treatment on the alloy in the solution treatment stage and the aging treatment stage. For conventional aluminum alloys, the solution treatment temperature is relatively high (>530°C) and the time is relatively long (>8 h); the aging treatment temperature is also relatively high (>160°C) and the time is relatively long (>8 h). Therefore, long-term ultrasonic treatment in such a high-temperature harsh environment places stringent requirements on the long-term high-temperature resistance of the ultrasonic generator electronic equipment and the ultrasonic generator amplitude probe, so the implementation feasibility is poor, and the investment in ultrasonic generator equipment is relatively large, resulting in a high overall cost.

[0047] (2) The improvement effect of alloy performance is not obvious: the amount and dispersion of strengthening phases in the alloy are determined by the amount and dispersion of GP zones. The formation period of GP zones is mainly when the alloy is left to stand at room temperature after quenching, and only a small part is formed during the aging treatment. Therefore, during the solution treatment and aging treatment, although ultrasonic treatment of the alloy can improve the amount and dispersion of strengthening phases to a certain extent, the improvement effect on the mechanical properties of the alloy is not obvious.

[0048] One of the purposes of the present invention is to reduce the heat treatment cost of aluminum alloy and improve the alloy properties of aluminum alloy.

[0049] The first aspect of the present invention provides an ultrasonic quenching method for aluminum alloy, Figure 1 It is introduced that the key of the ultrasonic quenching treatment method is to quench the supersaturated solid solution obtained after the solution treatment of the aluminum alloy; and to intermittently ultrasonically treat the aluminum alloy after the quenching treatment, and ensure that the aluminum alloy is in close contact with the ultrasonic probe during the ultrasonic treatment; and to age the aluminum alloy after the intermittent ultrasonic treatment, and then air-cool it to room temperature.

[0050] The "room temperature" in the present invention generally refers to a state where no active heating or cooling is performed. For example, in the present embodiment, the room temperature may be 20°C to 30°C.

[0051] The ultrasonic quenching treatment method of aluminum alloy in the present invention is specifically carried out according to the following steps.

[0052] Solution treatment In an embodiment of the present invention, the aluminum alloy is subjected to a solid solution treatment to ensure that the solute atoms in the alloy are completely dissolved into the alloy to form a supersaturated solid solution.

[0053] In some embodiments of the present invention, the aluminum alloy is solution treated according to a conventional heat treatment process.

[0054] In some embodiments of the present invention, the temperature of the solution treatment is 490° C. to 550° C., and the time of the solution treatment is 6 h to 12 h.

[0055] The temperature of the solution treatment provided by the present invention can be a value of an interval composed of any two values ​​in the above range, for example, it can be 490°C to 520°C, or 520°C to 550°C, and so on. The temperature of the solution treatment provided by the present invention can also be one of 490°C, 495°C, 500°C, 505°C, 510°C, 515°C, 520°C, 525°C, 530°C, 535°C, 540°C, 545°C, 550°C, or any value that satisfies the above range.

[0056] The time of the solution treatment provided by the present invention can be a value of an interval composed of any two values ​​in the above range, for example, it can be 6 h to 10 h, or 10 h to 12 h, and so on. The time of the solution treatment provided by the present invention can also be one of 6 h, 7 h, 8 h, 9 h, 10 h, 11 h, 12 h or any value that satisfies the above range.

[0057] Quenching treatment In an embodiment of the present invention, the supersaturated solid solution after the solution treatment is placed in a cooling medium for quenching treatment to ensure that it is cooled to the same temperature as the cooling medium.

[0058] In some embodiments of the present invention, the temperature of the quenching treatment is 45°C to 75°C. Exemplarily, the temperature of the quenching treatment can be a value of an interval consisting of any two values ​​in the above range, such as 45°C to 60°C, or 60°C to 75°C, and so on. For example, the temperature of the quenching treatment can also be one of 45°C, 50°C, 55°C, 60°C, 63°C, 65°C, 70°C, 75°C, or any value that satisfies the above range.

[0059] In some embodiments of the present invention, the quenching treatment time is more than 20 minutes, for example, 30 minutes, to ensure that the aluminum alloy is cooled to the same temperature as the cooling medium, such as cooled to 45°C to 75°C.

[0060] It should be noted that the quenching time can also be 10 min~20 min, which is set according to actual conditions, and the purpose is to ensure that the aluminum alloy is cooled to the same temperature as the cooling medium temperature.

[0061] In some embodiments of the present invention, the supersaturated solid solution after the solution treatment is placed in a cooling medium for quenching treatment within a short time, the shorter the better, for example, within 12 seconds.

[0062] Exemplarily, the supersaturated solid solution is placed in a cooling medium for quenching treatment within any time within 12 s, for example, 1 s, 2 s, 3 s, 4 s, 5 s, 6 s, 7 s, 8 s, 9 s, 10 s, 11 s, or 12 s.

[0063] Intermittent ultrasonic treatment In an embodiment of the present invention, the aluminum alloy after quenching is subjected to intermittent ultrasonic treatment.

[0064] In some embodiments of the present invention, in the intermittent ultrasonic treatment, the ultrasonic power is 0.3 kw to 2.5 kw each time, the ultrasonic time is 5 min to 20 min each time, and the ultrasonic interval time is 5 min to 20 min.

[0065] The ultrasonic power provided by the present invention can be a value of an interval composed of any two values ​​in the above range, such as 0.3 kw~1.5 kw, or 1.5 kw~2.5 kw, and so on. For example, the ultrasonic power provided by the present invention can be one of 0.3 kw, 0.4 kw, 0.5 kw, 0.6 kw, 0.8 kw, 1.0 kw, 1.2 kw, 1.4 kw, 1.5 kw, 1.6 kw, 1.8 kw, 2.0 kw, 2.2 kw, 2.4 kw, 2.5 kw, or any value that meets the above range.

[0066] The ultrasonic time for each time provided by the present invention can be a value of an interval composed of any two values ​​in the above interval, such as 5 min to 10 min, or 10 min to 20 min, and so on. For example, the ultrasonic time for each time provided by the present invention can be one of 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min or any value that meets the above range.

[0067] The ultrasound interval time provided by the present invention can be a value of an interval composed of any two values ​​in the above interval, such as 5 min to 10 min, or 10 min to 20 min, and so on. For example, the ultrasound interval time provided by the present invention can be one of 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, 11 min, 12 min, 13 min, 14 min, 15 min, 16 min, 17 min, 18 min, 19 min, 20 min, or any value that meets the above range.

[0068] In some embodiments of the present invention, the number of ultrasonic treatments in intermittent ultrasonic treatment is 1 to 10 times. Exemplarily, the number of ultrasonic treatments in intermittent ultrasonic treatment can be a value of an interval composed of any two values ​​in the above interval, such as 3 to 8 times. The number of ultrasonic treatments in the intermittent ultrasonic treatment provided by the present invention can also be 1 time, 2 times, 3 times, 4 times, 5 times, 6 times, 7 times, 8 times, 9 times, 10 times or any value that satisfies the above range value.

[0069] In some embodiments of the present invention, the aluminum alloy after quenching is Figure 2The operation shown is to perform intermittent ultrasonic treatment, wherein close contact between the aluminum alloy sample 1 and the ultrasonic probe 2 is ensured during the ultrasonic treatment to ensure the effect of the ultrasonic treatment.

[0070] Aging treatment In an embodiment of the present invention, the aluminum alloy after ultrasonic treatment is placed in an aging furnace for aging treatment.

[0071] In some embodiments of the present invention, the temperature of the aging treatment is 120° C. to 165° C., and the time of the aging treatment is 3 h to 8 h.

[0072] In some embodiments of the present invention, the temperature of the aging treatment is 120° C. to 150° C., and the time of the aging treatment is 3 h to 5 h.

[0073] The temperature of the aging treatment provided by the present invention can be a value of an interval composed of any two values ​​in the above range, for example, it can be 120°C to 150°C, or 150°C to 165°C, and so on. The temperature of the aging treatment provided by the present invention can also be one of 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, 155°C, 160°C, 165°C, or any value that meets the above range.

[0074] The time of aging treatment provided by the present invention can be a value of an interval composed of any two values ​​in the above range, for example, it can be 3 h to 5 h, or 5 h to 8 h, and so on. The time of aging treatment provided by the present invention can also be one of 3 h, 4 h, 5 h, 6 h, 7 h, 8 h, or any value that satisfies the above range.

[0075] In an embodiment of the present invention, after the aging treatment is completed, the aluminum alloy is air-cooled to room temperature.

[0076] The second aspect of the present invention provides an aluminum alloy, the key point of which is that the aluminum alloy is prepared by the ultrasonic quenching method of the first aspect.

[0077] In the embodiment of the present invention, the tensile strength of the aluminum alloy is 317 MPa-357 MPa, the yield strength is 249 MPa-304.5 MPa, and the elongation is 2.3%-5.13%.

[0078] The tensile strength of the aluminum alloy provided by the present invention can be one of 317 MPa, 320 MPa, 330 MPa, 340 MPa, 351 MPa, 357 MPa or any value satisfying the above range.

[0079] The yield strength of the aluminum alloy provided by the present invention may be one of 249 MPa, 260 MPa, 270 MPa, 280 MPa, 290 MPa, 300 MPa, 304.5 MPa or any value satisfying the above range.

[0080] The elongation of the aluminum alloy provided by the present invention can be one of 2.3%, 2.5%, 2.8%, 3.0%, 3.2%, 3.5%, 3.8%, 4.0%, 4.2%, 4.5%, 4.8%, 5.13% or any value satisfying the above range.

[0081] Unless otherwise defined, the technical terms used in the following examples have the same meanings as those generally understood by those skilled in the art to which the present invention belongs. The experimental reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the raw materials, instruments and equipment used in the following examples, etc., can all be purchased on the market or can be obtained by existing methods; the amounts of the experimental reagents, unless otherwise specified, are the amounts of reagents used in conventional experimental operations; the experimental methods, unless otherwise specified, are all conventional methods.

[0082] Example 1 A method for ultrasonic quenching of aluminum alloy, the specific steps are as follows Figure 1 shown.

[0083] 1) Use ZAlSi7Mg1Cu and design its solution treatment temperature and time.

[0084] 2) ZAlSi7Mg1Cu was solution treated at 530℃ for 9 h to obtain a supersaturated solid solution.

[0085] 3) The supersaturated solid solution was quickly placed in a 63°C water medium for quenching within 12 seconds, and then cooled in the water medium for 30 minutes.

[0086] 4) The quenched aluminum alloy is Figure 2 The intermittent ultrasonic treatment was performed in the manner shown, wherein the ultrasonic treatment was performed 5 times, the ultrasonic power was 1.2 kw each time, the ultrasonic time was 11 min each time, and the ultrasonic interval time was 20 min.

[0087] 5) The aluminum alloy after ultrasonic treatment is placed in an aging furnace for aging treatment. The aging treatment temperature is 145°C and the aging treatment time is 4 h.

[0088] 6) After aging treatment, the aluminum alloy is air-cooled to room temperature.

[0089] The samples obtained in Example 1 were subjected to mechanical property tests, and the test results are shown in Table 1.

[0090] Example 2 A method for ultrasonic quenching of aluminum alloy, the specific steps are as follows Figure 1 shown.

[0091] 1) Use ZAlSi7Mg1Cu and design its solution treatment temperature and time.

[0092] 2) ZAlSi7Mg1Cu was solution treated at 530℃ for 9 h to obtain a supersaturated solid solution.

[0093] 3) The supersaturated solid solution was quickly placed in a 63°C water medium for quenching within 12 seconds, and then cooled in the water medium for 30 minutes.

[0094] 4) The quenched aluminum alloy is Figure 2 The intermittent ultrasonic treatment was performed in the manner shown, wherein the ultrasonic treatment was performed twice, each time with an ultrasonic power of 0.3 kw, each time with an ultrasonic time of 5 min, and an ultrasonic interval of 20 min.

[0095] 5) The aluminum alloy after ultrasonic treatment is placed in an aging furnace for aging treatment. The aging treatment temperature is 140°C and the aging treatment time is 4 h.

[0096] 6) After aging treatment, the aluminum alloy is air-cooled to room temperature.

[0097] The samples obtained in Example 2 were subjected to mechanical property tests, and the test results are shown in Table 1.

[0098] Comparative Example 1 A quenching treatment method for aluminum alloy, the specific steps are as follows.

[0099] 1) Use ZAlSi7Mg1Cu and design its solution treatment temperature and time.

[0100] 2) ZAlSi7Mg1Cu was solution treated at 530℃ for 9 h to obtain a supersaturated solid solution.

[0101] 3) The supersaturated solid solution was quickly placed in a 63°C water medium for quenching within 12 seconds, and then cooled in the water medium for 30 minutes.

[0102] 4) The quenched aluminum alloy is placed in an aging furnace for aging treatment. The aging treatment temperature is 165°C and the aging treatment time is 8 h.

[0103] 5) After aging treatment, the aluminum alloy is air-cooled to room temperature.

[0104] The mechanical properties of the samples obtained in Comparative Example 1 were tested, and the test results are shown in Table 1.

[0105] Performance Testing The mechanical property tests in the embodiments and comparative examples of the present invention are performed in accordance with GB / T 228.1 Metallic material tensile tests Part 1: Room temperature test methods.

[0106] Table 1 Summary of processing parameters and mechanical properties of aluminum alloys in Examples and Comparative Examples

[0107] It can be seen from Table 1 that the present invention performs intermittent ultrasonic treatment on the aluminum alloy after quenching treatment, so that the aluminum alloy obtains more GP zones during the static process after quenching treatment, and then in the subsequent aging treatment process of the alloy, more and evenly distributed strengthening phases can be obtained at a lower temperature and in a shorter time, thereby greatly improving the comprehensive mechanical properties of the aluminum alloy.

[0108] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for ultrasonic quenching of aluminum alloy, characterized in that: The ultrasonic quenching treatment method comprises: quenching the supersaturated solid solution obtained after the aluminum alloy solid solution treatment; and The aluminum alloy after the quenching treatment is subjected to intermittent ultrasonic treatment, and during the ultrasonic treatment process, the aluminum alloy is ensured to be in close contact with the ultrasonic probe; The aluminum alloy after the intermittent ultrasonic treatment is subjected to aging treatment and then air-cooled to room temperature.

2. The ultrasonic quenching method for aluminum alloy according to claim 1, characterized in that: The temperature of the aging treatment is 120° C. to 165° C., and the time of the aging treatment is 3 h to 8 h.

3. The ultrasonic quenching method of aluminum alloy according to claim 2, characterized in that: The temperature of the aging treatment is 120° C. to 150° C., and the time of the aging treatment is 3 h to 5 h.

4. The ultrasonic quenching method of aluminum alloy according to claim 1, characterized in that: In the intermittent ultrasonic treatment, the ultrasonic power is 0.3 kw to 2.5 kw each time, the ultrasonic time is 5 min to 20 min each time, and the ultrasonic interval time is 5 min to 20 min.

5. The ultrasonic quenching method for aluminum alloy according to claim 1 or 4, characterized in that: The number of ultrasonic treatments in the intermittent ultrasonic treatment is 1 to 10 times.

6. The ultrasonic quenching method of aluminum alloy according to claim 1, characterized in that: The temperature of the quenching treatment is 45°C to 75°C.

7. The ultrasonic quenching method for aluminum alloy according to claim 1 or 6, characterized in that: The supersaturated solid solution is subjected to the quenching treatment within 12 seconds.

8. The ultrasonic quenching method of aluminum alloy according to claim 1, characterized in that: The temperature of the solution treatment is 490° C. to 550° C., and the time of the solution treatment is 6 h to 12 h.

9. An aluminum alloy, characterized in that: The aluminum alloy is obtained by the ultrasonic quenching method according to any one of claims 1 to 8.

10. The aluminum alloy according to claim 9, characterized in that The aluminum alloy has a tensile strength of 317 MPa to 357 MPa, a yield strength of 249 MPa to 304.5 MPa, and an elongation of 2.3% to 5.13%.

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