High-strength high-plasticity corrosion-resistant multi-component alloy and preparation method thereof

Abstract

The invention discloses a high-strength, high-plasticity and corrosion-resistant multi-component alloy and a preparation method thereof. The multi-component alloy comprises elements of Al, Cr, Fe, Ni and Ti according to the molar ratio of (0.5 to 0.8): (0.8 to 1.2): (0.8 to 1.2): (2.0 to 3.0): (0.2 to 0.6). The preparation method of the alloy comprises the following steps: performing electric arc melting on metals Al, Fe and Ni according to a ratio in an inert atmosphere, and grinding into powder to obtain first alloy powder; under the inert atmosphere, metal Ti and metal Cr are subjected to electric arc melting and then cooled, and a second alloy is obtained; preparing a packing material by adopting a second alloy, and encapsulating the first alloy powder into the packing material to obtain an intermediate; and under the inert atmosphere, the intermediate is subjected to electric arc melting to be in a molten state, the molten state is maintained for 15-150 s, then cooling is conducted, and the multi-component alloy is obtained. The alloy is good in biocompatibility, high in strength, high in plasticity and excellent in corrosion resistance, and has a good application prospect in the medical field.

Description

Technical Field

[0001] The present invention relates to a titanium alloy and a preparation method thereof, and in particular to a multi-component alloy with high strength, high plasticity, corrosion resistance and good biocompatibility and a preparation method thereof. Background Art

[0002] The demand for biomedical alloy materials in the fields of orthopedics, cardiovascular, dental implants, etc. continues to increase. Implant materials such as artificial joints are corroded by various physiological fluids and environments in the body. Therefore, in addition to high mechanical properties, they are also required to have good corrosion resistance and biodegradability. At present, pure titanium and titanium alloys (Ti-6Al-4V) are widely used in clinical practice due to their excellent compatibility with the human body, high specific strength, low elastic modulus and excellent corrosion resistance. However, the strength of titanium and its alloy materials will decrease during use, and they are prone to wear and even failure after long-term use. The expected service life of materials implanted in the human body, such as artificial joints and dental implants, is more than 20 years. Existing titanium alloys are difficult to meet people's expectations for the lifelong use of implant materials. New biomedical materials are in urgent need of development.

[0003] In order to enhance the performance of Ti alloys, elements such as Nb, Zr, Ta, Mo, Co, Cr, and Al are added to titanium alloys. However, the research and development of titanium alloy materials has mostly been designed in accordance with traditional alloy theory, which makes it difficult to concentrate the excellent properties of each element in the alloy composition, thus limiting the development of biomedical alloy materials. The concept of high entropy alloys has broken through the framework of traditional single-principal alloy design and provided a new approach to the development of biomedical metal materials. The high entropy effect can inhibit the formation of brittle intermetallic compounds between elements, thereby forming a solid solution with a simple face-centered cubic, body-centered cubic and other structures. For example, Al with FCC structure 0.6 CrFeNi 2.4 The alloy exhibits excellent plasticity and corrosion resistance. Studies have shown that, based on a multi-component alloy system, increasing or changing the content of one element can significantly change the microstructure of the alloy and thus improve its performance. Studies have shown that adding an appropriate amount of Ti helps to achieve the best balance between strength and plasticity of high entropy alloys. For example, Al 0.3 CrFeNi2Ti 0.3 The alloy has a fracture strength of 1240MPa and a plasticity of 11.7%. x(x=0~2.5) causes the redistribution of elements in the alloy, forming FCC phase, L21 phase, nano-scale BCC phase, η-Ni3Ti phase and MgZn2 type Fe2Ti Laves phase. This complex microstructure makes its yield strength reach 2105MPa and plasticity reach 12%. In addition, Ti exhibits excellent corrosion resistance in chloride ion solution. Ti will spontaneously form a protective TiO2 oxide film, thereby inhibiting the expansion of point defects. AlCoCrFeNiTi 0.5 The alloy exhibits better corrosion resistance than AlCoCrFeNi alloy.

[0004] Although the addition of elements such as Co, Cr, Fe, and Ni can effectively improve the performance of titanium alloys in terms of corrosion resistance and strength, some elements such as Co, Ni, Fe, and Al have poor biocompatibility, which can easily lead to a significant reduction in the biocompatibility of titanium alloys, affecting the application of titanium alloys in biomedical materials. Summary of the Invention

[0005] Objective of the Invention: The objective of the present invention is to provide a multi-component alloy with excellent biocompatibility, high strength, high plasticity, and excellent corrosion resistance, addressing the inability of existing titanium alloys to balance biocompatibility and physical and chemical properties. Another objective of the present invention is to provide a method for preparing a high-strength, high-plasticity, and corrosion-resistant multi-component alloy, addressing the problem of how to prepare such a high-strength, high-plasticity, and corrosion-resistant multi-component alloy.

[0006] Technical solution: The high-strength, high-plasticity, corrosion-resistant multi-component alloy described in the present invention contains Al, Cr, Fe, Ni and Ti elements in a molar ratio of 0.5-0.8:0.8-1.2:0.8-1.2:2.0-3.0:0.2-0.6.

[0007] Preferably, the high strength, high plasticity and corrosion resistant multi-component alloy is selected from at least one of the following alloys: Al 0.6 Cr1Fe1Ni 2.4 Ti 0.2 、Al 0.6 Cr1Fe1Ni 2.4 Ti 0.4 、Al 0.6 Cr1Fe1Ni 2.4 Ti 0.5 、Al 0.6 Cr1Fe1Ni 2.4 Ti 0.6 .

[0008] The second aspect of the present invention discloses a method for preparing the above-mentioned high-strength, high-plasticity, corrosion-resistant multi-component alloy, comprising the following steps:

[0009] (1) arc melting metals Al, Fe, and Ni according to a ratio under an inert atmosphere to obtain a first alloy, and crushing and grinding the first alloy into powder to obtain a first alloy powder;

[0010] (2) arc melting metal Ti and metal Cr according to the ratio under an inert atmosphere and then cooling to obtain a second alloy;

[0011] (3) preparing a packaging material using the second alloy, and encapsulating the first alloy powder into the packaging material according to the ratio to obtain an intermediate;

[0012] (4) Under an inert atmosphere, arc melt the intermediate to a molten state, maintain the molten state for 15-150 seconds, and then cool to obtain a multi-component alloy.

[0013] Preferably, in steps (1), (2) and (4), the inert atmosphere is created by evacuating the arc melting furnace chamber to a vacuum of 2×10 -3 -4×10 -3 After reaching 0.5 Pa, open the gas valve and fill in argon gas to restore the pressure in the furnace chamber to 0.5-10 Pa.

[0014] Preferably, in steps (1) and (2), the current of the arc melting is 50-100 A, and the alloy is kept in a molten state for 2-5 minutes during the arc melting process.

[0015] Preferably, in step (1), the particle size of the first alloy powder is 100-1000 μm.

[0016] Preferably, in step (3), the packaging material is a hollow tube with a wall thickness of 1-3 mm.

[0017] Preferably, the purity of the metals Al, Fe, Ni, Ti, and Cr is ≥99.9wt.%

[0018] Preferably, in step (4), the intermediate further comprises the following post-processing steps after cooling:

[0019] Polish the surface of the multi-component alloy, then immerse the multi-component alloy in alcohol or acetone, using a power density of 0.5-1.5W / cm 2 , ultrasonic cleaning is performed with an ultrasonic frequency of 25-55Hz.

[0020] Preferably, in step (4), the cooling method is: vacuum casting the intermediate in a molten state at a pressure of 1-10 Pa, and rapidly cooling it to room temperature to obtain the formed multi-component alloy.

[0021] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0022] The Al-Cr-Fe-Ni-Ti multi-component alloy system provided by the present invention achieves the best combination of strength, plasticity and corrosion resistance by adjusting the Ti content. 0.6 CrFeNiTi x This biomedical high-entropy alloy boasts a compressive yield strength of up to 2000 MPa and an ultimate fracture strength exceeding 2800 MPa. This material improves the strength of the more widely used Ti-6Al-4V material by over 100%, while maintaining a plasticity of 15-35%. Its corrosion resistance in simulated body fluid environments is superior to that of stainless steel, resolving the technical issue of existing implant alloys failing to meet long-term service strength requirements. Furthermore, the present invention successfully addresses the issue of doping elements affecting the biocompatibility of titanium alloys through a cladding melt preparation method, resulting in an Al-Cr-Fe-Ni-Ti multi-component alloy system with excellent biocompatibility and significantly improved overall performance. This alloy has promising application prospects in medical fields such as artificial joints, bone trauma products (steel plates, screws, etc.), and dental implants. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 As-cast Al 0.6 CrFeNi 2.4 Ti x XRD patterns of the alloy. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be further described below with reference to the accompanying drawings.

[0025] Example 1: A multi-component alloy Al 0.6 Cr1Fe1Ni 2.4 Ti 0.2 The preparation method is as follows:

[0026] (1) Metal Al, metal Cr, metal Fe, metal Ni and metal Ti are weighed in a molar ratio of 0.6:1.0:1.0:2.4:0.2, and the purity of metal Ti and metals Al, Fe, Ni and Cr are all ≥99.9wt.%.

[0027] (2) Metals Al, Fe and Ni are placed in a crucible in a non-consumable vacuum arc melting furnace, and the furnace chamber is evacuated to a vacuum of 2.5×10 -3 After the furnace reaches 5 Pa, the gas valve is opened to fill with argon gas, so that the pressure in the furnace chamber is restored to 5 Pa to create an inert atmosphere, and arc melting is performed at a current of 70 A. During the arc melting process, electromagnetic stirring is accompanied to increase the uniformity of the alloy mixing. Each metal ingot is turned over 6 times, and each melting time is 40 seconds. After cooling, the first alloy is obtained, and the first alloy is crushed and ground into a powder with a particle size of 500 μm to obtain a first alloy powder;

[0028] (3) arc melting the Ti and Cr metals at a current of 70 A under the same inert atmosphere as in step (2), remelting them 6 times, each melting time being 40 seconds, and cooling to obtain a second alloy;

[0029] (4) The second alloy is rolled and rolled to obtain a hollow tube with a wall thickness of 2 mm, and the first alloy powder is encapsulated in the hollow tube to obtain an intermediate;

[0030] (5) In the same inert atmosphere as step (2), the intermediate is arc-melted at a current of 80 A to a molten state, and the molten state is maintained for 60 seconds. The molten intermediate is vacuum-casted at a pressure of 5 Pa and rapidly cooled to room temperature to obtain a formed multi-component alloy (abbreviated as Ti 0.2 ), polish the surface of the multi-component alloy, and then immerse the multi-component alloy in acetone with a power density of 1.0 W / cm 2 Ultrasonic cleaning is performed using ultrasound with a frequency of 40 Hz for 7 minutes.

[0031] Example 2: A multi-component alloy Al 0.6 Cr1Fe1Ni 2.4 Ti 0.4 The preparation method is as follows:

[0032] (1) Metal Al, metal Cr, metal Fe, metal Ni and metal Ti are weighed in a molar ratio of 0.6:1.0:1.0:2.4:0.4, and the purity of metal Ti and metals Al, Fe, Ni and Cr are all ≥99.9wt.%.

[0033] (2) Metals Al, Fe and Ni are placed in a crucible in a non-consumable vacuum arc melting furnace, and the furnace chamber is evacuated to a vacuum of 2×10 -3 After the furnace reaches 1 Pa, the gas valve is opened to fill with argon gas, so that the pressure in the furnace chamber is restored to 1 Pa to create an inert atmosphere, and arc melting is performed at a current of 60 A. During the arc melting process, electromagnetic stirring is accompanied to increase the uniformity of the alloy mixing. Each metal ingot is turned over 6 times, and each melting time is 40 seconds. After cooling, the first alloy is obtained, and the first alloy is crushed and ground into a powder with a particle size of 100 μm to obtain a first alloy powder;

[0034] (3) arc melting the Ti and Cr metals at a current of 60 A under the same inert atmosphere as in step (2), remelting them 6 times, each melting time being 40 seconds, and cooling to obtain a second alloy;

[0035] (4) rolling the second alloy to obtain a hollow tube with a wall thickness of 1 mm, and encapsulating the first alloy powder in the hollow tube to obtain an intermediate;

[0036] (5) In the same inert atmosphere as step (2), the intermediate is arc-melted at a current of 50 A to a molten state, and the molten state is maintained for 30 seconds. The molten intermediate is vacuum-casted at a pressure of 6 Pa and rapidly cooled to room temperature to obtain a formed multi-component alloy (abbreviated as Ti 0.4 ), polish the surface of the multi-component alloy, and then immerse the multi-component alloy in alcohol, using a power density of 0.8W / cm 2 Ultrasonic cleaning is performed using ultrasound with a frequency of 33 Hz for 8 minutes.

[0037] Example 3: A multi-component alloy Al 0.6 Cr1Fe1Ni 2.4 Ti 0.5 The preparation method is as follows:

[0038] (1) Metal Al, metal Cr, metal Fe, metal Ni and metal Ti are weighed in a molar ratio of 0.6:1.0:1.0:2.4:0.5, and the purity of metal Ti and metals Al, Fe, Ni and Cr are all ≥99.9wt.%.

[0039] (2) Metals Al, Fe and Ni are placed in a crucible in a non-consumable vacuum arc melting furnace, and the furnace chamber is evacuated to a vacuum of 3.0×10 -3 After the furnace reaches 5 Pa, the gas valve is opened to fill with argon gas, so that the pressure in the furnace chamber is restored to 5 Pa to create an inert atmosphere, and arc melting is performed at a current of 80 A. During the arc melting process, electromagnetic stirring is accompanied to increase the uniformity of the alloy mixing. Each metal ingot is turned over 6 times, and each melting time is 40 seconds. After cooling, the first alloy is obtained, and the first alloy is crushed and ground into a powder with a particle size of 300 μm to obtain a first alloy powder;

[0040] (3) arc melting the Ti and Cr metals at a current of 50 A under the same inert atmosphere as in step (2), remelting them 6 times, each melting time being 40 seconds, and cooling to obtain a second alloy;

[0041] (4) The second alloy is rolled and rolled to obtain a hollow tube with a wall thickness of 2 mm, and the first alloy powder is encapsulated in the hollow tube to obtain an intermediate;

[0042] (5) In the same inert atmosphere as in step (2), the intermediate was arc-melted at a current of 70 A until it was molten, and the molten state was maintained for 100 s. The molten intermediate was vacuum-casted at a pressure of 10 Pa and rapidly cooled to room temperature to obtain a formed multi-component alloy (abbreviated as Ti 0.5 ), polish the surface of the multi-component alloy, and then immerse the multi-component alloy in alcohol, using a power density of 0.5W / cm 2 Ultrasonic cleaning is performed with an ultrasonic frequency of 25 Hz for 5 minutes.

[0043] Example 4: A multi-component alloy Al 0.6 Cr1Fe1Ni 2.4 Ti 0.6 The preparation method is as follows:

[0044] (1) Metal Al, metal Cr, metal Fe, metal Ni and metal Ti are weighed in a molar ratio of 0.6:1.0:1.0:2.4:0.6, and the purity of metal Ti and metals Al, Fe, Ni and Cr are all ≥99.9wt.%.

[0045] (2) Metals Al, Fe and Ni are placed in a crucible in a non-consumable vacuum arc melting furnace, and the furnace chamber is evacuated to a vacuum of 2.0×10 -3 After the furnace reaches 5 Pa, the gas valve is opened to fill with argon gas, so that the pressure in the furnace chamber is restored to 5 Pa to create an inert atmosphere, and arc melting is performed at a current of 100 A. During the arc melting process, electromagnetic stirring is accompanied to increase the uniformity of the alloy mixing. Each metal ingot is turned over 5 times, and each melting time is 40 seconds. After cooling, the first alloy is obtained, and the first alloy is crushed and ground into a powder with a particle size of 1000 μm to obtain a first alloy powder;

[0046] (3) arc melting the metal Ti and metal Cr at a current of 100 A under the same inert atmosphere as in step (2), remelting five times, each melting time of 40 seconds, and cooling to obtain a second alloy;

[0047] (4) The second alloy is rolled and rolled to obtain a hollow tube with a wall thickness of 3 mm, and the first alloy powder is encapsulated in the hollow tube to obtain an intermediate;

[0048] (5) In the same inert atmosphere as in step (2), the intermediate is arc-melted at a current of 100 A until it is molten, and the molten state is maintained for 120 s. The molten intermediate is vacuum-casted at a pressure of 6 Pa and rapidly cooled to room temperature to obtain a formed multi-component alloy (abbreviated as Ti 0.6 ), polish the surface of the multi-component alloy, and then immerse the multi-component alloy in acetone with a power density of 1.5W / cm 2 Ultrasonic cleaning is performed using ultrasound with a frequency of 55 Hz for 10 minutes.

[0049] Example 5: A multi-component alloy Al 0.5 Cr 0.8 Fe 0.8 Ni 2.0 Ti 0.4 The preparation method is as follows:

[0050] (1) Metal Al, metal Cr, metal Fe, metal Ni and metal Ti are weighed in a molar ratio of 0.5:0.8:0.8:2.0:0.4, and the purity of metal Ti and metals Al, Fe, Ni and Cr are all ≥99.9wt.%.

[0051] (2) Metals Al, Fe and Ni are placed in a crucible in a non-consumable vacuum arc melting furnace, and the furnace chamber is evacuated to a vacuum of 4×10 -3 After the furnace reaches 3 Pa, the gas valve is opened to fill with argon gas, so that the pressure in the furnace chamber is restored to 3 Pa to create an inert atmosphere, and arc melting is performed at a current of 90 A. During the arc melting process, electromagnetic stirring is accompanied to increase the uniformity of the alloy mixing. Each metal ingot is turned over 4 times, and each melting time is 30 seconds. After cooling, the first alloy is obtained, and the first alloy is crushed and ground into a powder with a particle size of 500 μm to obtain a first alloy powder;

[0052] (3) arc melting the Ti and Cr metals at a current of 90 A under the same inert atmosphere as in step (2), remelting them 4 times, each melting time of 30 seconds, and cooling to obtain a second alloy;

[0053] (4) rolling the second alloy to obtain a hollow tube with a wall thickness of 1.5 mm, and encapsulating the first alloy powder in the hollow tube to obtain an intermediate;

[0054] (5) In the same inert atmosphere as in step (2), the intermediate is arc-melted at a current of 60 A to a molten state, and the molten state is maintained for 30 seconds. The molten intermediate is vacuum-casted at a pressure of 10 Pa, and rapidly cooled to room temperature to obtain a formed multi-component alloy. The surface of the multi-component alloy is polished, and the multi-component alloy is immersed in alcohol at a power density of 1.5 W / cm 2 Ultrasonic cleaning is performed using ultrasound with a frequency of 55 Hz for 5 minutes.

[0055] Comparative Example 1: The rest are the same as Example 1, except that:

[0056] In step (3), no metal Ti is added to the smelting process to obtain alloy Al 0.6 Cr1Fe1Ni 2.4 , referred to as Ti0.

[0057] Comparative Example 2: The rest are the same as Example 1, except that:

[0058] Metal Al, metal Cr, metal Fe, metal Ni and metal Ti are added together into a crucible in a non-consumable vacuum arc melting furnace and arc melted at a current of 70 A for 6 times, with each melting time being 40 seconds. After melting, the alloy sample is directly suction cast, cooled and cleaned.

[0059] Comparative Example 3: The rest are the same as Example 1, except that:

[0060] In step (5), the molten state is maintained for 15 seconds.

[0061] Comparative Example 4: The rest are the same as Example 1, except that:

[0062] In step (5), the molten state is maintained for 150 seconds.

[0063] Comparative Example 5: The rest are the same as Example 1, except that:

[0064] In step (4), the wall thickness of the hollow tube is 4 mm.

[0065] Comparative Example 6: The rest are the same as Example 1, except that:

[0066] In step (4), the wall thickness of the hollow tube is 0.5 mm.

[0067] The Al2O3 of Examples 1-4 was analyzed by X-ray diffractometer. 0.6 CrFeNi 2.4 Ti x (x = 0.2, 0.4, 0.6, 0.8) and comparative example 1 were subjected to phase analysis, the operating voltage and current were 40 kV and 20 mA respectively, the X-ray source was CuKα (λ = 0.1542 nm) ray, and the scanning angle 2θ range was 20 to 120°.

[0068] The XRD spectra of the alloy samples prepared in Examples 1-4 and Comparative Example 1 are as follows: Figure 1 As shown, Figure 1 (a) is the overall view from 20° to 90°, and (b) is the local enlarged view from 42° to 46°. Figure 1 Comparative Example 1 exhibits a single FCC phase. After the addition of Ti, a new BCC phase peak appears at approximately 44.3°, designated the BCC1 phase. The addition of Ti weakens the FCC phase peak and increases the BCC1 phase peak, indicating a decrease in the FCC phase volume and an increase in the BCC1 phase volume. A new BCC phase peak, designated the BCC2 phase, appears in the Ti0.5 and Ti0.6 alloys. This demonstrates that the addition of Ti promotes the formation of the BCC phase.

[0069] Pure Ti, Ti-6Al-4V, and 316L stainless steel, two materials most widely used in dental and surgical implants, were selected as control groups, and compression performance and corrosion resistance tests were performed on Examples 1-4 and Comparative Examples 1-6. The test data are shown in Table 1.

[0070] Compression performance test method: The diameter of the cylindrical specimen used in the compression test is 4mm and the height is 6mm. The axis of the specimen is parallel to the outer surface of the cylinder and the upper and lower planes are parallel. The compression test is carried out at room temperature using a computer-controlled high-temperature electronic universal testing machine. -3 A constant compression speed of mm / s corresponds to 10 -3 s -1 The initial strain rate.

[0071] Corrosion resistance testing method: Alloy performance was tested using a three-electrode system, with a cold-mounted specimen as the working electrode, a platinum sheet as the auxiliary electrode, and a silver chloride electrode as the reference electrode. The corrosion solution was SBF simulated body fluid. Polarization curves were measured using a CHI760E electrochemical workstation to obtain the alloy's self-corrosion current and self-corrosion voltage. The polarization curve scan range was -1.5 V to 1.5 V, with a scan rate of 0.01 V.

[0072] Table 1 Performance test data of different metals or alloys

[0073]

[0074] As can be seen from Table 1:

[0075] Strength-Plasticity: Only the Ti-6Al-4V alloy approaches the yield strength of Example 1. The yield strength and fracture strength of the other examples are significantly superior to those of the comparative example. Comparative Example 1 does not fracture even after plastic deformation exceeding 60%, but its yield strength is relatively low. Examples 1-4 show that with increasing Ti content, the yield strength of the examples significantly improves, while the plasticity decreases, though still maintaining a good plasticity of 15.5% at the lowest. This series of alloys exhibits excellent combined strength and plasticity mechanical properties.

[0076] Corrosion resistance: It is generally believed that a higher self-corrosion voltage indicates a more resistant alloy to corrosion and better corrosion resistance, while the self-corrosion current indicates the corrosion rate of an alloy after corrosion has initiated. The electrochemical parameters of the examples in a simulated body fluid environment were similar to those of the comparative examples, demonstrating excellent corrosion resistance, with Example 1 showing the most outstanding corrosion resistance.

[0077] Varying the content of a single element can lead to differences in the phase structure of multi-component alloys, ultimately leading to differences in performance. By adding varying amounts of Ti, it is inferred that the optimal combination of strength, plasticity, and corrosion resistance can be achieved by regulating the Ti content to meet the needs of various dental and surgical implants. Its performance maintains the high corrosion resistance of existing materials while offering significant advantages over existing materials in key mechanical properties such as strength and plasticity. Furthermore, the material described in this invention is in the cast state, requiring no heat treatment, thus saving heat treatment costs.

[0078] The biocompatibility of the alloy samples prepared in Examples 1-4 and Comparative Examples 1-6 was tested as follows:

[0079] All alloy samples were suction-cast into rod-shaped implants with a diameter of 2 mm and a height of 3 mm. Adult New Zealand white rabbits were anesthetized, and oblique holes with a diameter of 2 mm and a depth of 3 mm were drilled into the femurs. The rod-shaped implants were inserted into the holes, sealed with bone cement, sutured, and antibiotics administered. Twelve weeks later, the rabbits were sacrificed, and the femurs containing the implants were removed. Micro-CT was used to measure the new bone volume fraction and bone density, and tensile testing was used to measure the interfacial bonding strength between the implant and the femur. The results are as follows:

[0080] Table 2 Test results of bone integration ability of different alloy samples

[0081]

[0082]

[0083] The results of Table 2 are combined with the results of Table 1 to show that in Comparative Example 1, when the Ti element is missing, the various physicochemical properties and biocompatibility of the alloy material are poor. In Comparative Example 2, although higher strength, plasticity and corrosion resistance can be obtained after the elements are fully smelted and mixed, the biocompatibility of the non-Ti doped elements is poor, resulting in the overall biocompatibility of the alloy being poor and unable to be used in medical implants. Comparative Example 3 shows that when the maintenance time of the intermediate molten state is too short, the first alloying element inside fails to fully diffuse close to the alloy surface, and the second alloying element on the surface has better biocompatibility, resulting in good overall biocompatibility of the alloy, but due to the low mixing degree of the first alloy and the second alloy, the overall mechanical properties and corrosion resistance of the alloy are poor. Comparative Example 4 is the opposite. When the maintenance time of the intermediate molten state is too long, the first alloy and the second alloying element are fully mixed, so that the overall mechanical properties and corrosion resistance of the alloy are better, but the first alloying element fully diffuses to the alloy surface, resulting in poor biocompatibility. In Comparative Example 5, the excessive wall thickness of the hollow tube hindered the diffusion of the first alloying element to the surface, ultimately resulting in good biodegradability but poor physicochemical properties for the alloy sample. In contrast, in Comparative Example 6, the excessively thin tube wall allowed a greater amount of the first alloying element to diffuse and mix onto the alloy sample's surface, resulting in poor overall biocompatibility.

Claims

1. A high-strength, high-plasticity, corrosion-resistant multi-component alloy, characterized in that: Contains Al, Cr, Fe, Ni and Ti elements in a molar ratio of 0.5-0.8:0.8-1.2:0.8-1.2:2.0-3.0:0.2-0.

6.

2. The high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 1, characterized in that: At least one selected from the following alloys: Al 0.6 Cr1Fe1Ni 2.4 Ti 0.2 、Al 0.6 Cr1Fe1Ni 2.4 Ti 0.4 、Al 0.6 Cr1Fe1Ni 2.4 Ti 0.5 、Al 0.6 Cr1Fe1Ni 2.4 Ti 0.6 .

3. The method for preparing the high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 1 or 2, characterized in that: The steps include: (1) arc melting metals Al, Fe, and Ni according to a ratio under an inert atmosphere to obtain a first alloy, and crushing and grinding the first alloy into powder to obtain a first alloy powder; (2) arc melting metal Ti and metal Cr according to the ratio under an inert atmosphere and then cooling to obtain a second alloy; (3) preparing a packaging material using the second alloy, and encapsulating the first alloy powder into the packaging material according to the ratio to obtain an intermediate; (4) Under an inert atmosphere, arc melt the intermediate to a molten state, maintain the molten state for 15-150 seconds, and then cool to obtain a multi-component alloy.

4. The method for preparing a high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: In steps (1), (2) and (4), the inert atmosphere is created as follows: the arc melting furnace is vacuumed to 2×10 -3 -4×10 -3 After reaching 0.5 Pa, open the gas valve and fill in argon gas to restore the pressure in the furnace chamber to 0.5-10 Pa.

5. The method for preparing the high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: In steps (1) and (2), the arc melting current is 50-100 A, and the alloy is kept in a molten state for 2-5 minutes during the arc melting process.

6. The method for preparing a high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: In step (1), the particle size of the first alloy powder is 100-1000 μm.

7. The method for preparing a high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: In step (3), the packaging material is a hollow tube with a wall thickness of 1-3 mm.

8. The method for preparing a high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: The purity of the metals Al, Fe, Ni, Ti and Cr are all ≥99.9wt.%.

9. The method for preparing a high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: In step (4), after the intermediate is cooled, the following post-processing steps are further included: Polish the surface of the multi-component alloy, then immerse the multi-component alloy in alcohol or acetone, using a power density of 0.5-1.5W / cm 2 , ultrasonic cleaning is performed with an ultrasonic frequency of 25-55Hz.

10. The method for preparing a high-strength, high-plasticity, corrosion-resistant multi-component alloy according to claim 3, characterized in that: In step (4), the cooling method is: vacuum casting the intermediate in a molten state at a pressure of 1-10 Pa, and rapidly cooling it to room temperature to obtain a formed multi-component alloy.

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