A large-size bulk al-cu-fe single-phase quasicrystal alloy and a preparation method thereof

Abstract

The application discloses a large-size bulk Al-Cu-Fe single-phase quasicrystal alloy and a preparation method thereof, belongs to the technical field of new materials, and comprises the following steps: Al, Cu and Fe particles are prepared, melted and air-cooled to obtain a cast quasicrystal alloy; the cast quasicrystal alloy is vacuum annealed to obtain a single-phase quasicrystal alloy; the single-phase quasicrystal alloy is crushed and ground to obtain single-phase quasicrystal powder particles; and the single-phase quasicrystal powder particles are sintered through rapid hot-pressing sintering and cooled to obtain the large-size bulk Al-Cu-Fe single-phase quasicrystal alloy. The sintering through the rapid hot-pressing sintering method can realize preparation of a large-size quasicrystal alloy; the sintered bulk quasicrystal has good density; and the Al-Cu-Fe single-phase quasicrystal alloy does not change phase during the sintering process.

Description

Technical Field

[0001] This invention belongs to the field of new materials technology, and in particular relates to a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy and its preparation method. Background Technology

[0002] Quasicrystalline materials are alloys with long-range orientational order and no translational symmetry. Based on the quasi-periodic dimension of the atomic arrangement of the quasicrystalline material, quasicrystalline materials can be classified into three-dimensional quasicrystalline materials, two-dimensional quasicrystalline materials, and one-dimensional quasicrystalline materials. Al-Cu-Fe quasicrystalline alloy is a typical three-dimensional quasicrystalline alloy with an icosahedral structure and is in a thermodynamically stable state.

[0003] At present, the preparation process of Al-Cu-Fe quasicrystalline alloys includes traditional smelting technology and powder sintering technology. The relevant literature on the preparation of Al-Cu-Fe quasicrystalline alloys by traditional smelting technology is shown in Table 1. Smelting and annealing are the key steps to obtain single-phase Al-Cu-Fe quasicrystalline alloys. However, Al-Cu-Fe quasicrystalline alloys prepared by traditional smelting process have the following problems: (1) After the alloy is smelted and cooled, no matter how large the casting size is, the material will crack due to cold expansion, which is difficult to avoid; (2) The alloy obtained by smelting is a cast quasicrystalline alloy. In addition to the Al-Cu-Fe quasicrystalline I phase, the material also includes λ phase and β phase, which need to be further annealed to obtain a single-phase quasicrystalline alloy; (3) During the annealing process, the high-density λ phase will be transformed into the low-density quasicrystalline I phase, making the material porous and generating a large number of voids. The above points make it difficult to carry out mechanical property testing on the prepared Al-Cu-Fe quasicrystalline alloy.

[0004] Table 1 Traditional Smelting Techniques

[0005]

[0006]

[0007] Powder sintering is a relatively advanced forming technology that is now widely used in powder forming. Its principle is to heat metal powder to make the material enter a thermoplastic state, and then press it into shape under high pressure. At present, powder sintering technology has been applied to the preparation of Al-Cu-Fe quasicrystalline alloys, as shown in Table 2. The Al-Cu-Fe quasicrystalline alloys prepared by powder sintering process mainly include plasma discharge sintering (SPS) and hot isostatic pressing (HIP). Although Al-Cu-Fe quasicrystalline alloys with high density can be obtained, there are also the following problems: (1) Plasma discharge sintering (SPS) requires an expensive pulse power supply, so the cost of sintering once is high. The size of the sintered sample by plasma discharge sintering (SPS) is generally small, so the cost of mass production is huge; (2) The cost of hot isostatic pressing (HIP) is higher than that of plasma discharge sintering (SPS) technology, and there is a certain degree of danger.

[0008] Table 2 Powder Sintering Process

[0009]

[0010] Mechanized alloying can also be used to prepare quasicrystalline powders. Different metal powders are mixed, and the raw materials are alloyed by ball milling, followed by annealing to obtain single-phase quasicrystalline powders. However, this method requires ball milling alloying for tens of hours, resulting in high time costs. Moreover, mechanized alloying is difficult to obtain single-phase quasicrystalline powders, leading to low yield per batch.

[0011] High-pressure gas atomization can also be used to prepare quasicrystalline powders with uniform composition and particle size. However, the equipment and energy costs required for high-pressure gas atomization to prepare powders are huge and the technical requirements are high. Therefore, high-pressure gas atomization is usually not chosen to prepare quasicrystalline powders.

[0012] There is an urgent need in this field for a method to prepare large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloys that is simple to prepare, time-saving, low-cost, and can be mass-produced. Summary of the Invention

[0013] The purpose of this invention is to provide a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy and its preparation method, so as to solve the problems existing in the prior art.

[0014] One of the technical solutions provided by this invention:

[0015] A method for preparing a large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy includes the following steps: mixing Al, Cu, and Fe particles, melting, and air-cooling to obtain a cast quasicrystalline alloy; vacuum annealing the cast quasicrystalline alloy to obtain a single-phase quasicrystalline alloy; crushing and grinding the single-phase quasicrystalline alloy to obtain single-phase quasicrystalline powder particles; and rapidly hot-pressing and sintering the single-phase quasicrystalline powder particles to obtain a large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy.

[0016] Preferably, the Al, Cu, and Fe particles are prepared in an atomic ratio of 63:25:12, and the purity of the Al, Cu, and Fe particles is 99.99%.

[0017] Preferably, the vacuum annealing process is as follows: heating to 750°C at a heating rate of 5°C / min and holding at that temperature for 6 hours, wherein 750°C is the annealing temperature.

[0018] Preferably, the grinding is performed using a planetary ball mill with a ball-to-material ratio of 10:1 and a grinding time of 6 hours.

[0019] More preferably, the grinding time for a single grinding session is 15 minutes, with a 20-minute interval between two adjacent grinding sessions.

[0020] By simultaneously controlling the time of a single grinding cycle and the time interval between adjacent grinding cycles, the effect of the temperature rise caused by grinding on the crystal phase can be avoided.

[0021] Preferably, the particle size of the single-phase quasi-crystalline powder particles is ≤75μm, which is equivalent to ≤200 mesh.

[0022] Preferably, the rapid hot-pressing sintering process is as follows: the single-phase quasi-crystalline powder particles are directly placed into a graphite mold, and then a pressure head is placed in for preliminary compaction. The graphite mold containing the single-phase quasi-crystalline powder particles is placed into the cavity of the rapid hot-pressing sintering equipment, a vacuum is drawn, and the temperature is increased at a rate of 200℃ / min, while a radial pressure is applied at 15MPa / min. Within 5 minutes, the required sintering temperature of 630-730℃ and the radial pressure of 50MPa are reached. Sintering is carried out for 5 minutes, the pressure is released, the furnace is cooled, and the mold is removed to obtain a large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy. The heating rate and the radial pressure application rate are set according to the set temperature and pressure.

[0023] The second technical solution provided by this invention:

[0024] A large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared by the above preparation method.

[0025] The beneficial effects of this invention are:

[0026] The rapid hot-pressing sintering method allows for the design of molds of different sizes according to actual needs, offering good controllability. Because the sintering time is significantly shortened, the sintering process can suppress grain growth and better prepare single-phase samples. Therefore, compared with existing technologies, this invention has the following advantages: (1) Sintering using the rapid hot-pressing method can achieve the preparation of larger-sized quasicrystalline alloys, enabling mass production; (2) Sintering cost is low and safe; (3) The sintered bulk quasicrystalline material has good density, reaching 4.2-4.6 g / cm³. 3 (4) The Al-Cu-Fe single-phase quasi-crystalline alloy prepared by rapid hot pressing sintering will not undergo phase transformation during sintering; (5) The large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy obtained by the preparation method provided by the present invention can be easily processed into various types of test pieces so as to carry out mechanical property tests under different conditions. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A flowchart illustrating the preparation method of a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy provided by the present invention;

[0029] Figure 2 Photograph of the large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in Example 3;

[0030] Figure 3 The image shows the X-ray diffraction pattern of the as-cast quasicrystalline alloy in Example 3.

[0031] Figure 4 The image shows the X-ray diffraction pattern of the single-phase quasicrystalline alloy in Example 3.

[0032] Figure 5 The image shows the X-ray diffraction pattern of the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in Example 3.

[0033] Figure 6 The density variation with sintering temperature of the large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloys prepared in Examples 1-3 is shown.

[0034] Figure 7 The image shows the morphology of the large-sized bulk Al-Cu-Fe single-phase quasicrystalline alloy prepared in Example 1 under an optical microscope.

[0035] Figure 8 The image shows the morphology of the large-sized bulk Al-Cu-Fe single-phase quasicrystalline alloy prepared in Example 2 under an optical microscope.

[0036] Figure 9 The image shows the morphology of the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in Example 3 under an optical microscope. Detailed Implementation

[0037] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as a limitation of the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0038] It should be understood that the terminology used in this invention is merely for describing particular embodiments and is not intended to limit the invention. Furthermore, with respect to numerical ranges in this invention, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Every smaller range between any stated value or intermediate value within a stated range, and any other stated value or intermediate value within said range, is also included in this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0039] Unless otherwise stated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. While only preferred methods and materials have been described herein, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this invention. All references to this specification are incorporated by way of citation to disclose and describe methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0040] Various modifications and variations can be made to the specific embodiments described in this specification without departing from the scope or spirit of the invention, as will be apparent to those skilled in the art. Other embodiments derived from this specification will also be obvious to those skilled in the art. This application specification and embodiments are merely exemplary.

[0041] The terms “include,” “including,” “have,” “contain,” etc., used in this article are all open-ended terms, meaning that they include but are not limited to.

[0042] This invention selects an economical and efficient method for preparing quasicrystalline alloys. First, a cast quasicrystalline alloy is obtained through high-temperature vacuum melting technology. Then, a single-phase quasicrystalline alloy is obtained by annealing. The annealed material is mechanically crushed and ball-milled to obtain alloy powder with smaller particle size. Finally, a large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy is prepared by high-temperature and high-pressure sintering.

[0043] This invention provides a method for preparing large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy. The method involves batching, melting, and air-cooling Al, Cu, and Fe particles to obtain a cast quasicrystalline alloy. The cast quasicrystalline alloy is then vacuum-annealed to obtain a single-phase quasicrystalline alloy. The single-phase quasicrystalline alloy is then crushed and ground to obtain single-phase quasicrystalline powder particles. These single-phase quasicrystalline powder particles are then rapidly hot-pressed, sintered, and cooled to obtain the large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy.

[0044] Figure 1 This invention provides a flowchart of a method for preparing large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloys.

[0045] In a preferred embodiment of the present invention, the Al, Cu, and Fe particles are prepared in an atomic ratio of 63:25:12, and the purity of the Al, Cu, and Fe particles is 99.99%.

[0046] In some preferred embodiments of the present invention, the vacuum annealing process is as follows: heating to 750°C at a heating rate of 5°C / min and holding at that temperature for 6 hours.

[0047] In some preferred embodiments of the present invention, the grinding is carried out using a planetary ball mill with a ball-to-material ratio of 10:1 and a grinding time of 4-6 hours. To ensure that the material undergoes a phase change due to the temperature rise during the ball milling process, the single ball milling time needs to be controlled. The ball milling time is set to 15 minutes, followed by a 20-minute pause.

[0048] In some preferred embodiments of the present invention, the particle size of the single-phase quasi-crystalline powder particles is ≤75μm.

[0049] In some preferred embodiments of the present invention, the rapid hot pressing sintering process is as follows: the single-phase quasi-crystalline powder particles are directly placed into a graphite mold, and then a pressure head is placed in for preliminary compaction. The graphite mold containing the single-phase quasi-crystalline powder particles is placed into the cavity of a rapid hot pressing sintering equipment, a vacuum is drawn, and the temperature is increased at a rate of 200°C / min, while a radial pressure of 15 MPa / min is applied. Within 5 minutes, the required sintering temperature of 630-730°C and the radial pressure of 50 MPa are reached. Sintering is carried out for 5 minutes, the pressure is unloaded, the furnace is cooled, and the mold is removed to obtain a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy.

[0050] The rapid hot pressing sintering equipment (FHP-888) used in this invention can set the temperature and pressure to reach the predetermined values ​​simultaneously. The entire sintering process is efficient and convenient, and the equipment has a full Chinese touch screen interface.

[0051] Rapid hot pressing (RTB) sintering is one of the most advanced rapid sintering methods currently available. This technology is comparable to plasma discharge sintering (SPS) and is being applied for the first time in the preparation of bulk quasicrystalline materials. Compared to SPS, RTB does not require expensive pulsed power supplies, resulting in lower sintering costs, faster sintering speed, and higher sample density. Therefore, this invention uses RTB for sintering. Traditional sintering techniques typically employ indirect heating, heating the entire cavity through heating elements and then transferring heat to the mold. Sintering times generally take several hours or days. However, RTB uses pressure-assisted heating where the power supply directly heats the mold, and the current passes directly through the powder. This allows for more precise temperature control, achieving rapid densification of the material in just minutes or even seconds. The achievable maximum sintering temperature is 2400℃, the maximum heating rate is 600℃ / min, and the temperature control accuracy is within ±2℃ of 1000℃.

[0052] All raw materials used in this invention were obtained through purchase.

[0053] Example 1

[0054] S1. Take Al, Cu and Fe particles with a purity of 99.99% and mix them according to an atomic ratio of 63:25:12;

[0055] S2. The raw materials after batching are melted in a high vacuum induction melting furnace at a melting temperature of 1300℃. To ensure material uniformity, the melting is repeated 5 times and then air-cooled to obtain a cast quasi-crystalline alloy.

[0056] S3. The as-cast quasicrystalline alloy obtained by S2 melting is subjected to vacuum annealing at a heating rate of 5℃ / min. After heating to 750℃, it is held for 6 hours to obtain a single-phase quasicrystalline alloy.

[0057] S4. The single-phase quasicrystalline alloy prepared in S3 is mechanically crushed to obtain single-phase quasicrystalline alloy particles with a particle size of ≤200 mesh. In order to make the particle shape approximately the same, the quasicrystalline powder is further ground using a planetary ball mill with a ball-to-powder ratio of 10:1 and a ball milling time of 6 hours (during which the single grinding time is 15 minutes and the time interval between two adjacent grindings is 20 minutes) to obtain single-phase quasicrystalline powder particles.

[0058] S5. Take a graphite mold with a diameter of 100 mm, place the single-phase quasi-crystalline powder particles obtained by crushing and grinding in S4 into the graphite mold, put in the pressure head for preliminary compaction, put the graphite mold into the cavity of the rapid sintering equipment, evacuate, heat at a heating rate of 200℃ / min while applying radial pressure at a rate of 15MPa / min, when the sintering temperature reaches 630℃, the radial pressure also reaches 50MPa; hold the temperature and pressure for 5 min, unload the pressure, cool with the furnace temperature, demold, and obtain a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy.

[0059] The density of the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in this embodiment was determined to be 4.261 g / cm³ using the water displacement method. 3 .

[0060] Example 2

[0061] S1. Take Al, Cu and Fe particles with uniform purity of 99.99% and mix them according to an atomic ratio of 63:25:12;

[0062] S2. The raw materials after batching are melted in a high vacuum induction melting furnace at a melting temperature of 1300℃. To ensure material uniformity, the melting is repeated 5 times and then air-cooled to obtain a cast quasi-crystalline alloy.

[0063] S3. The as-cast quasicrystalline alloy obtained by S2 melting is subjected to vacuum annealing at a heating rate of 5℃ / min. After heating to 750℃, it is held for 6 hours to obtain a single-phase quasicrystalline alloy.

[0064] S4. The single-phase quasicrystalline alloy prepared in S3 is mechanically crushed to obtain single-phase quasicrystalline alloy particles with a particle size of 200 mesh. In order to make the particle shape approximately the same, the quasicrystalline powder is further ground using a planetary ball mill with a ball-to-powder ratio of 10:1 and a ball milling time of 6 hours (during which the single grinding time is 15 minutes and the time interval between two adjacent grinding sessions is 20 minutes) to obtain single-phase quasicrystalline powder particles.

[0065] S5. Take a graphite mold with a diameter of 100mm, place the single-phase quasi-crystalline powder particles obtained by crushing and grinding in S4 into the graphite mold, put in the pressure head for preliminary compaction, put the graphite mold into the cavity of the rapid sintering equipment, evacuate, heat at a heating rate of 200℃ / min while applying radial pressure at a rate of 15MPa / min, when the sintering temperature reaches 660℃, the radial pressure also reaches 50MPa; hold the temperature and pressure for 5min, unload the pressure, cool with the furnace temperature, demold, and obtain a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy.

[0066] The density of the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in this embodiment was determined to be 4.396 g / cm³ using the water displacement method. 3 .

[0067] Example 3

[0068] S1. Take Al, Cu and Fe particles with uniform purity of 99.99% and mix them according to an atomic ratio of 63:25:12;

[0069] S2. The raw materials after batching are melted in a high vacuum induction melting furnace at a melting temperature of 1300℃. To ensure material uniformity, the melting is repeated 5 times and then air-cooled to obtain a cast quasi-crystalline alloy.

[0070] S3. The as-cast quasicrystalline alloy obtained by S2 melting is subjected to vacuum annealing at a heating rate of 5℃ / min. After heating to 750℃, it is held for 6 hours to obtain a single-phase quasicrystalline alloy.

[0071] S4. The single-phase quasicrystalline alloy prepared in S3 is mechanically crushed to obtain single-phase quasicrystalline alloy particles with a particle size of 200 mesh. In order to make the particle shape approximately the same, the quasicrystalline powder is further ground using a planetary ball mill with a ball-to-powder ratio of 10:1 and a ball milling time of 6 hours (during which the single grinding time is 15 minutes and the time interval between two adjacent grinding sessions is 20 minutes) to obtain single-phase quasicrystalline powder particles.

[0072] S5. Take a graphite mold with a diameter of 100mm, place the single-phase quasi-crystalline powder particles obtained by crushing and grinding in S4 into the graphite mold, put in the pressure head for preliminary compaction, put the graphite mold into the cavity of the rapid sintering equipment, evacuate, heat at a heating rate of 200℃ / min while applying radial pressure at a rate of 15MPa / min, when the sintering temperature reaches 730℃, the radial pressure also reaches 50MPa; hold the temperature and pressure for 5min, unload the pressure, cool with the furnace temperature, demold, and obtain a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy.

[0073] Figure 2 This is an image of a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in Example 3. Figure 3 It can be seen that the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared by the present invention did not exhibit cracking; Figure 3 The X-ray diffraction pattern of the as-cast quasicrystalline alloy in Example 3 shows that in addition to the quasicrystalline I phase, the as-cast quasicrystalline alloy also contains the λ phase and the β phase. Figure 4 The XRD results of the single-phase quasicrystalline alloy in this embodiment are obtained from... Figure 4 It can be seen that after annealing, the single-phase quasicrystalline alloy contains only the quasicrystalline I phase; Figure 5 The XRD results of the large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy prepared in this embodiment are shown. Compared with the XRD results of the single-phase quasicrystalline alloy, the material still contains only the quasicrystalline I phase after rapid hot pressing and sintering, and no phase transformation has occurred. It can be seen that this method can prepare large-size bulk Al-Cu-Fe single-phase quasicrystalline alloy.

[0074] The density of the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloy prepared in Example 3 was determined to be 4.618 g / cm³ using the water displacement method. 3 .

[0075] Figure 6 The density variation with sintering temperature of the large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloys prepared in Examples 1-3 is shown below. Figure 6 It can be seen that as the sintering temperature increases, the density of the alloy increases accordingly.

[0076] The large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloys prepared in Examples 1-3 were analyzed using an optical microscope. Figures 7-9 The images show the morphology of the large-sized bulk Al-Cu-Fe single-phase quasi-crystalline alloys prepared in Examples 1-3 under an optical microscope. Figures 7-9 It can be seen that the material surface has no obvious defects and has good density.

[0077] The heating and pressurization rates selected in this invention are already at a relatively high level for rapid hot pressing sintering technology. Since the bulk alloy obtained by sintering under current conditions does not undergo a phase transformation, it is certain that a phase transformation will not occur below these rates.

[0078] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy, characterized in that, The preparation method of the large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy includes the following steps: Al, Cu and Fe particles are batched, melted and air-cooled to obtain a cast quasi-crystalline alloy; the cast quasi-crystalline alloy is vacuum annealed to obtain a single-phase quasi-crystalline alloy; the single-phase quasi-crystalline alloy is crushed and ground to obtain single-phase quasi-crystalline powder particles; the single-phase quasi-crystalline powder particles are rapidly hot-pressed and sintered and cooled to obtain a large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy. The grinding was carried out using a planetary ball mill with a ball-to-material ratio of 10:1 and a grinding time of 4-6 hours. The grinding time for a single grinding session is 15 minutes, with a 20-minute interval between two adjacent grinding sessions. The particle size of the single-phase quasi-crystalline powder particles is ≤75μm; The rapid hot pressing sintering process is as follows: the single-phase quasi-crystalline powder particles are directly placed into a graphite mold, and then a pressure head is placed in for preliminary compaction. The graphite mold containing the single-phase quasi-crystalline powder particles is placed into the cavity of the rapid hot pressing sintering equipment, a vacuum is drawn, and the temperature is increased at a rate of 200℃ / min. At the same time, a radial pressure of 15MPa / min is applied. Within 5 minutes, the required sintering temperature of 630-730℃ and the radial pressure of 50MPa can be reached. After sintering for 5 minutes, the pressure is unloaded, the furnace is cooled, and the mold is demolded. The Al, Cu, and Fe particles are mixed in an atomic ratio of 63:25:12, and the purity of the Al, Cu, and Fe particles is 99.99%.

2. The large-size bulk Al-Cu-Fe single-phase quasi-crystalline alloy according to claim 1, characterized in that, The vacuum annealing process is as follows: heat to 750°C at a heating rate of 5°C / min and hold for 6 hours.

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