Aluminum alloy and its ultrasonic quenching treatment method

Abstract

The present invention belongs to the technical field of aluminum alloy preparation, and specifically relates to an aluminum alloy and an ultrasonic quenching treatment method thereof. The ultrasonic quenching treatment method of the aluminum alloy includes performing quenching treatment on the supersaturated solid solution obtained after solution treatment of the aluminum alloy; and performing intermittent ultrasonic treatment on the aluminum alloy after the quenching treatment, and ensuring close contact between the aluminum alloy and the ultrasonic probe during the ultrasonic treatment; performing aging treatment on the aluminum alloy after the intermittent ultrasonic treatment, and then air-cooling to room temperature. The ultrasonic quenching treatment method of the aluminum alloy in the present invention can solve the problems of high cost, large energy consumption, long time consumption and inability to fully exert the comprehensive performance of the aluminum alloy existing in the traditional heat treatment process.

Description

Technical Field

[0001] The present 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] As a metal material widely used in the fields of aerospace, transportation (automobiles, high-speed rails), construction, etc., aluminum alloy has the characteristics of high specific strength, good corrosion resistance, and excellent thermal / electrical conductivity. Heat treatment is an important means to improve the mechanical properties of aluminum alloy such as tensile strength, yield strength, and elongation. However, the traditional heat treatment process has the natural disadvantages of high cost, high energy consumption, long time consumption, and inability to fully exert the comprehensive performance of aluminum alloy, which greatly limits the application of aluminum alloy in high-end structural parts.

[0003] Therefore, the existing aluminum alloy and its preparation process 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 to improve the problems of high cost, high energy consumption, long time consumption, and inability to fully exert the comprehensive performance of the traditional heat treatment process.

[0005] The first aspect of the present invention provides an ultrasonic quenching treatment method for an aluminum alloy. The ultrasonic quenching treatment method includes: quenching the supersaturated solid solution obtained after solution treatment of the aluminum alloy; and performing intermittent ultrasonic treatment on the quenched aluminum alloy, and ensuring close contact between the aluminum alloy and the ultrasonic probe during the ultrasonic treatment; performing aging treatment on 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 per time is 0.3 kw to 2.5 kw, the ultrasonic time per time is 5 min to 20 min, and the ultrasonic interval time is 5 min to 20 min.

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

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

[0011] In some embodiments of the present invention, the temperature of the quenching treatment is 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 also provides an aluminum alloy, which is prepared by the ultrasonic quenching treatment method described in the first aspect.

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

[0016] The process of forming the strengthening phase is: atomic enrichment → G.P. zone → intermediate metastable phase → strengthening phase.

[0017] The period when atomic enrichment occurs is: after the solution treatment and quenching treatment of the aluminum alloy, atoms begin to migrate and enrich during the normal temperature standing process.

[0018] The formation period of the G.P. zone is: after the atoms migrate and enrich to a certain extent, the G.P. zone is formed (note: the G.P. zone is formed during both this period and the aging treatment period).

[0019] The formation period of the intermediate metastable phase and the strengthening phase: during the aging treatment process, the formed G.P. zone 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 process of forming the strengthening phase, it can be seen that the G.P. zone is the precursor of the formation of the strengthening phase. Therefore, the more and more dispersed the G.P. zones formed in the early stage are, the more and more dispersed the strengthening phases formed in the later stage will be, and the more and more dispersed the strengthening phases are, the better the mechanical properties of the aluminum alloy will be. The formation quantity and dispersion degree of the G.P. zone are also related to the temperature. The lower the temperature is, the more the number of formed G.P. zones and the better the dispersion. When the aging treatment temperature is relatively high (generally >160°C), it is not conducive to the formation of a large number of and dispersed G.P. zones. However, although a low temperature is conducive to the formation of a large number of and dispersed G.P. zones, the atomic migration rate is slow at this time, and the formation time of the G.P. zone is long (even several decades). Therefore, by performing ultrasonic treatment on the aluminum alloy at a low temperature (generally at room temperature), the migration energy of atoms in the aluminum alloy can be effectively improved, which is conducive to the rapid, large-scale and dispersed formation of the G.P. zone, and thus conducive to the formation of the strengthening phase in the later stage.

[0021] In addition, during long-term high-temperature aging treatment, the grain size of aluminum alloy will grow to varying degrees. The growth of grain size will reduce the comprehensive mechanical properties of aluminum alloy. However, by using ultrasonic treatment on the quenched aluminum alloy, a large number of G.P. zones can be formed at this stage, which can effectively shorten the temperature and time of subsequent aging treatment, avoid the growth of grain size, and is conducive to improving the comprehensive mechanical properties of aluminum alloy.

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

[0023] The present invention uses ultrasonic treatment to increase the migration energy of atoms, which is conducive to promoting the formation of a large number of dispersed G.P. zones at room temperature.

[0024] The present invention avoids the growth of the grain size of aluminum alloy and improves the comprehensive mechanical properties of aluminum alloy by reducing the temperature and time of aging treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a flowchart of the ultrasonic quenching treatment method for aluminum alloy in the embodiment of the present invention;

[0027] Figure 2 It is a schematic operation diagram of ultrasonic treatment in the embodiment of the present invention.

[0028] Description of the reference numerals:

[0029] 1 - Aluminum alloy specimen, 2 - Ultrasonic probe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The following will describe the exemplary embodiments of the present invention in more detail with reference to the drawings. Although the exemplary embodiments of the present invention are shown in the 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 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.

[0031] It should be understood that the terms used herein are for the purpose of describing specific exemplary embodiments only and are not intended to be limiting. Unless the context clearly dictates otherwise, the singular forms "a", "an", and "the" as used herein may also include the plural forms. The terms "comprising", "including", "containing", and "having" are inclusive and thus specify the presence of the stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the particular order described or illustrated, unless the order of performance is explicitly stated. It should also be understood that additional or alternative steps may be used.

[0032] In the description of the embodiments of the present invention, technical terms such as "first", "second", etc. are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present invention, the meaning of "a plurality of" is more than two, unless otherwise specifically defined.

[0033] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive of other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of the present invention, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0035] In the description of the embodiments of the present invention, the term "a plurality of" refers to more than two (including two). Similarly, "a plurality of groups" refers to more than two groups (including two groups), and "a plurality of pieces" refers to more than two pieces (including two pieces).

[0036] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "linkage", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0037] The following explains some terms in the present invention to facilitate the understanding of those skilled in the art.

[0038] Solid solution: It refers to an alloy phase in which solute atoms dissolve into the solvent lattice while still maintaining the solvent type. In this phase, the element atoms with a higher content are called solvent atoms, and the element atoms with a lower content are called solute atoms.

[0039] Solution treatment: It refers to a treatment method in which the alloy is heated to a constant temperature in a high-temperature single-phase region to completely dissolve the strengthening phase in the matrix, forming a supersaturated solid solution.

[0040] Quenching treatment: It refers to a treatment method in which the supersaturated solid solution formed after solution treatment is rapidly cooled (usually water-cooled) to maintain this supersaturated solid solution at room temperature.

[0041] Aging treatment: It refers to a heat treatment process in which the alloy, after solution treatment and quenching treatment, is placed at a relatively high temperature for a period of time so that its properties change with time.

[0042] Ultrasonic treatment: It is a technology that uses the vibration and cavitation of ultrasonic waves to change or accelerate the change of certain physical, chemical, and biological characteristics or states of substances.

[0043] Strengthening phase: It refers to a phase structure that is formed in the material through a specific process (such as heat treatment) and has the function of improving the mechanical properties of the material.

[0044] G.P. zone: It refers to the element enrichment zone inside the material before the formation of the strengthening phase.

[0045] In the method for heat treatment of magnesium alloy combined with high - energy ultrasonic treatment disclosed in the current prior art, the magnesium alloy is placed below the end of the high - energy ultrasonic horn, and then heated in an oil medium at a certain temperature for solution treatment for a period of time while applying high - energy ultrasonic waves with different powers. Then, quenching treatment is carried out in an oil medium at a certain temperature. Then, the magnesium alloy is placed below the end of the high - energy ultrasonic horn again, heated in an oil medium at a certain temperature for aging treatment for a period of time while applying high - energy ultrasonic waves with different powers. After aging and ultrasonic treatment are completed, the adjusting bolt is loosened, and the specimen is taken off and air - cooled to room temperature. This technology has a simple process and improves the performance of magnesium alloy to a certain extent.

[0046] Currently, the heat treatment cost of aluminum alloy is relatively high (requiring high - temperature and long - time treatment), and it is very difficult for traditional heat treatment processes to stimulate the best performance of the alloy, which also greatly limits the application of aluminum alloy in high - end structural parts.

[0047] The high - strength and high - plasticity age - hardening alloy and its ultrasonic aging treatment method disclosed in the prior art provide a process method of multiple heat treatment and cold deformation treatment. The specific operations are as follows: traditional aging treatment is carried out on the age - hardening alloy after conventional solution treatment and cold plastic deformation; the age - hardening alloy is subjected to secondary solution treatment and then quenched; the age - hardening alloy is subjected to secondary cold plastic deformation; the age - hardening alloy is subjected to secondary aging treatment; the age - hardening alloy is subjected to ultrasonic aging treatment, thereby obtaining a high - strength and high - plasticity age - hardening alloy.

[0048] However, the prior art still has the following disadvantages:

[0049] (1) Poor feasibility and high cost: The treatment methods disclosed in the above - mentioned prior art all 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); similarly, the aging treatment temperature is also relatively high (>160 °C) and the time is also relatively long (>8 h). Therefore, long - time ultrasonic treatment in such a harsh high - temperature environment poses harsh requirements on the high - temperature resistance of the ultrasonic generator electronic equipment and the ultrasonic generator horn probe for a long time. Thus, the implementation feasibility is relatively poor, and at the same time, the investment in the ultrasonic generator equipment is relatively large, and the comprehensive cost is relatively high.

[0050] (2) The improvement effect of alloy performance is not obvious: The formation quantity and dispersion degree of the strengthening phase in the alloy are determined by the formation quantity and dispersion degree of the G.P. zones. The formation period of the G.P. zones is mainly during the normal - temperature static process after the alloy is quenched, and only a very small part is formed during the aging treatment process. Therefore, during the solution treatment and aging treatment processes, ultrasonic treatment of the alloy can improve the formation quantity and dispersion degree of the strengthening phase to a certain extent, but the improvement effect on the mechanical properties of the alloy is not obvious.

[0051] One of the objectives of the present invention is to reduce the heat treatment cost of aluminum alloy and improve the alloy properties of aluminum alloy.

[0052] The first aspect of the present invention provides a method for ultrasonic quenching treatment of aluminum alloy. In combination with Figure 1 the introduction, the key of the ultrasonic quenching treatment method lies in quenching the supersaturated solid solution obtained after solution treatment of the aluminum alloy; and performing intermittent ultrasonic treatment on the aluminum alloy after quenching treatment, and ensuring close contact between the aluminum alloy and the ultrasonic probe during the ultrasonic treatment process; performing aging treatment on the aluminum alloy after intermittent ultrasonic treatment, and then air-cooling it to room temperature.

[0053] "Room temperature" in the present invention generally refers to a state without active heating and cooling. For example, in the embodiments of the present invention, the room temperature can be 20°C to 30°C.

[0054] The method for ultrasonic quenching treatment of aluminum alloy in the present invention is specifically carried out according to the following steps.

[0055] Solution treatment

[0056] In the embodiments of the present invention, the aluminum alloy is subjected to solution treatment to ensure that the solute atoms in the alloy are completely dissolved into the alloy to form a supersaturated solid solution.

[0057] In some embodiments of the present invention, the aluminum alloy is subjected to solution treatment according to the traditional heat treatment process.

[0058] 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.

[0059] The temperature of the solution treatment provided by the present invention can be the value within the range composed of any two values within the above range. For example, it can be 490°C to 520°C, or it can be 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 value.

[0060] The time of the solution treatment provided by the present invention can be the value within the range composed of any two values within the above range. For example, it can be 6 h to 10 h, or it can be 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 value.

[0061] Quenching treatment

[0062] In an embodiment of the present invention, the supersaturated solid solution after 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.

[0063] 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 any value within the range formed by any two values within the above range. For example, it can be 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.

[0064] In some embodiments of the present invention, the time of the quenching treatment is more than 20 min, for example, 30 min, 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.

[0065] It should be noted that the time of the quenching treatment can also be 10 min to 20 min, which is specifically set according to the actual situation, and the purpose is to ensure that the aluminum alloy is cooled to the same temperature as the cooling medium.

[0066] In some embodiments of the present invention, the supersaturated solid solution after solution treatment is placed in a cooling medium for quenching treatment within a short time, and the shorter the time, the better, for example, within 12 s.

[0067] Exemplarily, the supersaturated solid solution is placed in a cooling medium for quenching treatment at 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, 12 s.

[0068] Intermittent ultrasonic treatment

[0069] In an embodiment of the present invention, the aluminum alloy after quenching treatment is subjected to intermittent ultrasonic treatment.

[0070] In some embodiments of the present invention, in the intermittent ultrasonic treatment, the ultrasonic power per time is 0.3 kw to 2.5 kw, the ultrasonic time per time is 5 min to 20 min, and the ultrasonic interval time is 5 min to 20 min.

[0071] The ultrasonic power provided by the present invention for each time can be a value within the range formed by any two values within the above-mentioned range. For example, it can be 0.3 kw to 1.5 kw, or 1.5 kw to 2.5 kw, and so on. For example, the ultrasonic power provided by the present invention for each time 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 satisfies the above range.

[0072] The ultrasonic time provided by the present invention for each time can be a value within the range formed by any two values within the above-mentioned range. For example, it can be 5 min to 10 min, or 10 min to 20 min, and so on. For example, the ultrasonic time provided by the present invention for each time 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 satisfies the above range.

[0073] The ultrasonic interval time provided by the present invention can be a value within the range formed by any two values within the above-mentioned range. For example, it can be 5 min to 10 min, or 10 min to 20 min, and so on. For example, the ultrasonic 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 satisfies the above range.

[0074] In some embodiments of the present invention, the number of ultrasonic treatments in the intermittent ultrasonic treatment is 1 to 10 times. Exemplarily, the number of ultrasonic treatments in the intermittent ultrasonic treatment can be a value within the range formed by any two values within the above-mentioned range. For example, it can be 3 to 8 times. The number of ultrasonic treatments in the intermittent ultrasonic treatment provided by the present invention can also be one of 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.

[0075] In some embodiments of the present invention, the aluminum alloy after quenching treatment is in accordance with Figure 2Perform intermittent ultrasonic treatment according to the operations shown, ensuring close contact between the aluminum alloy specimen 1 and the ultrasonic probe 2 during ultrasonic treatment to ensure the effect of ultrasonic treatment.

[0076] Aging treatment

[0077] In an embodiment of the present invention, the ultrasonic-treated aluminum alloy is placed in an aging furnace for aging treatment.

[0078] 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.

[0079] 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.

[0080] The temperature of the aging treatment provided by the present invention can be the value within the range composed of any two values within the above range. For example, it can be 120°C to 150°C, or it can be 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 satisfies the above range.

[0081] The time of the aging treatment provided by the present invention can be the value within the range composed of any two values within the above range. For example, it can be 3 h to 5 h, or it can be 5 h to 8 h, and so on. The time of the 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.

[0082] In an embodiment of the present invention, after the aging treatment is completed, the aluminum alloy is air-cooled to room temperature.

[0083] The second aspect of the present invention provides an aluminum alloy, which is characterized in that the aluminum alloy is prepared by the ultrasonic quenching treatment method of the first aspect.

[0084] In an embodiment of the present invention, the tensile strength of the aluminum alloy is 317 MPa to 357 MPa, the yield strength is 249 MPa to 304.5 MPa, and the elongation is 2.3% to 5.13%.

[0085] 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 that satisfies the above range.

[0086] The yield strength of the aluminum alloy provided by the present invention can 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 values.

[0087] 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 values.

[0088] Unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. The experimental reagents used in the following examples are all conventional biochemical reagents unless otherwise specified; the raw materials, instruments and equipment used in the following examples can all be obtained through market purchase or by existing methods; the dosages of the experimental reagents are all the dosages of the reagents in conventional experimental operations unless otherwise specified; the experimental methods are all conventional methods unless otherwise specified.

[0089] Example 1

[0090] An ultrasonic quenching treatment method for an aluminum alloy, the specific steps are shown in Figure 1 as follows.

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

[0092] 2) Solution-treat ZAlSi7Mg1Cu at 530 °C for 9 h to obtain a supersaturated solid solution.

[0093] 3) Quickly put the supersaturated solid solution into a water medium at 63 °C for quenching treatment within 12 s and cool it in the water medium for 30 min.

[0094] 4) Intermittently ultrasonically treat the quenched aluminum alloy in the manner shown in Figure 2 as follows, where the ultrasonic treatment is carried out 5 times, the ultrasonic power is 1.2 kw each time, the ultrasonic time is 11 min each time, and the ultrasonic interval time is 20 min.

[0095] 5) Put the ultrasonically treated aluminum alloy into an aging furnace for aging treatment, the aging treatment temperature is 145 °C, and the aging treatment time is 4 h.

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

[0097] Test the mechanical properties of the specimen obtained in Example 1, and the test results are shown in Table 1 in detail.

[0098] Example 2

[0099] A method for ultrasonic quenching treatment of aluminum alloy, the specific steps are shown in Figure 1 as follows.

[0100] 1) Use ZAlSi7Mg1Cu and design its solution treatment temperature and time.

[0101] 2) Solution-treat ZAlSi7Mg1Cu at 530 °C for 9 h to obtain a supersaturated solid solution.

[0102] 3) Quickly put the supersaturated solid solution into a water medium at 63 °C for quenching treatment within 12 s, and cool in the water medium for 30 min.

[0103] 4) Intermittently ultrasonically treat the quenched aluminum alloy in the manner shown in Figure 2 as follows. The ultrasonic treatment is carried out 2 times, with an ultrasonic power of 0.3 kw each time, an ultrasonic time of 5 min each time, and an ultrasonic interval time of 20 min.

[0104] 5) Put the ultrasonically treated aluminum alloy into an aging furnace for aging treatment. The aging treatment temperature is 140 °C and the aging treatment time is 4 h.

[0105] 6) After the aging treatment is completed, air-cool the aluminum alloy to room temperature.

[0106] Conduct mechanical property tests on the specimens obtained in Example 2. The test results are shown in Table 1 in detail.

[0107] Comparative Example 1

[0108] A quenching treatment method for aluminum alloy, the specific steps are as follows.

[0109] 1) Use ZAlSi7Mg1Cu and design its solution treatment temperature and time.

[0110] 2) Solution-treat ZAlSi7Mg1Cu at 530 °C for 9 h to obtain a supersaturated solid solution.

[0111] 3) Quickly put the supersaturated solid solution into a water medium at 63 °C for quenching treatment within 12 s, and cool in the water medium for 30 min.

[0112] 4) Put the quenched aluminum alloy into an aging furnace for aging treatment. The aging treatment temperature is 165 °C and the aging treatment time is 8 h.

[0113] 5) After the aging treatment is completed, air-cool the aluminum alloy to room temperature.

[0114] The specimens obtained in Comparative Example 1 were subjected to mechanical property tests, and the test results are shown in Table 1 in detail.

[0115] Mechanical property test

[0116] In the examples and comparative examples of the present invention, the mechanical property tests were carried out in accordance with GB / T 228.1 Metallic materials - Tensile testing - Part 1: Method of test at room temperature.

[0117] Table 1 Summary of processing technology parameters and mechanical properties of aluminum alloys in examples and comparative examples

[0118]

[0119] It can be seen from Table 1 that by subjecting the quenched aluminum alloy to intermittent ultrasonic treatment, the present invention enables the aluminum alloy to obtain more G.P. zones during the static process after quenching. Furthermore, during the subsequent aging treatment process of the alloy, more uniformly distributed strengthening phases can be obtained at a lower temperature and in a shorter time, thereby significantly improving the comprehensive mechanical properties of the aluminum alloy.

[0120] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An ultrasonic quenching treatment method for aluminum alloy, characterized in that, The ultrasonic quenching treatment method includes: Performing quenching treatment on the supersaturated solid solution obtained after solution treatment of the aluminum alloy, wherein the temperature of the solution treatment is 490°C to 530°C, and the time of the solution treatment is 6 h to 12 h; and Performing intermittent ultrasonic treatment on the aluminum alloy after the quenching treatment, and ensuring close contact between the aluminum alloy and the ultrasonic probe during the ultrasonic treatment; in the intermittent ultrasonic treatment, the ultrasonic power per time is 0.3 kw to 2.5 kw, the ultrasonic time per time is 5 min to 20 min, and the ultrasonic interval time is 5 min to 20 min; Performing aging treatment on the aluminum alloy after the intermittent ultrasonic treatment, wherein the temperature of the aging treatment is 120°C to 160°C, the time of the aging treatment is 3 h to 8 h, and then air-cooling to room temperature.

2. The ultrasonic quenching treatment method of aluminum alloy according to claim 1, 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.

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

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

5. The ultrasonic quenching treatment method for aluminum alloy according to claim 1 or 4, characterized in that, Performing the quenching treatment on the supersaturated solid solution within 12 s.

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