Refractory high-entropy alloy with high plasticity and high toughness and method of making same

Abstract

The present application relates to the technical field of alloy materials, and particularly relates to a refractory high-entropy alloy with high plasticity and high toughness and a preparation method thereof. The composition elements of the refractory high-entropy alloy are Hf, Nb and Ti, or the composition elements of the refractory high-entropy alloy are Hf, Nb, Ti and X, wherein X is selected from one or more of Ta, Zr, Mo or V; the refractory high-entropy alloy has a BCC structure crystal face. The present application aims to obtain a refractory high-entropy alloy with high strength and high fracture toughness by adjusting the proportion of different refractory metals.

Description

Technical Field

[0001] This invention relates to the field of alloy materials technology, and in particular to refractory high-entropy alloys with high plasticity and high toughness and their preparation methods. Background Technology

[0002] With the rapid development of high technology, especially in fields such as machinery, chemical engineering, and nuclear power, the service conditions of related components are becoming increasingly demanding. Traditional alloys with single properties are insufficient to meet the application requirements of these engineering fields. Therefore, developing new alloys with high strength, high toughness, and high wear resistance has become an effective way to solve these problems. Taiwanese scholar Yeh Chun-wei broke with traditional alloy design concepts and proposed the design concept of high-entropy alloys. The high-entropy effect, lattice distortion effect, hysteresis diffusion effect, and "cocktail" effect of high-entropy alloys give them excellent mechanical properties, wear resistance, corrosion resistance, high-temperature resistance, and radiation resistance, showing extremely broad application prospects in the aforementioned engineering fields.

[0003] High-entropy alloys include FCC (Fuel Concentration Coefficient), BCC (Body Concentration Coefficient), and HCP (High-Entropy Compensation Coefficient). Among these, refractory high-entropy alloys with a BCC structure, primarily composed of refractory metals such as Ti, Ta, Nb, Mo, Hf, V, Zr, and W, exhibit great potential for application in high-temperature materials due to their high melting point, high yield strength, and excellent high-temperature performance. However, existing refractory high-entropy alloys generally suffer from extremely poor room-temperature plasticity and very low fracture toughness, making them highly susceptible to brittle fracture and other catastrophic consequences when used as components under heavy loads and impacts. This severely limits their application range. Therefore, overcoming the technical bottleneck of poor room-temperature plasticity and toughness in refractory high-entropy alloys and developing refractory high-entropy alloys that combine high strength, good plasticity, and toughness has become an urgent need. Summary of the Invention

[0004] To address the aforementioned problems (poor room temperature plasticity and extremely low fracture toughness of refractory high-entropy alloys), the purpose of this invention is to provide refractory high-entropy alloys with high plasticity and high toughness, as well as a method for their preparation. This invention primarily achieves refractory high-entropy alloys possessing both high strength and high fracture toughness by adjusting the proportions of different refractory metals.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] The first objective of this invention is to provide a refractory high-entropy alloy with high plasticity and high toughness, wherein the constituent elements of the refractory high-entropy alloy are Hf, Nb and Ti, or the constituent elements of the refractory high-entropy alloy are Hf, Nb, Ti and X, wherein X is selected from one or more of Ta, Zr, Mo or V.

[0007] The refractory high-entropy alloy has a BCC structure crystal plane.

[0008] In one embodiment of the present invention, the atomic percentage content of Hf in the refractory high entropy alloy is 45% to 80%, the atomic percentage content of Ta is 0 to 30%, the atomic percentage content of Zr is 0 to 35%, the atomic percentage content of Nb is 3% to 35%, the atomic percentage content of Ti is 0.5% to 20%, the atomic percentage content of Mo is 0 to 15%, and the atomic percentage content of V is 0 to 15%.

[0009] The second objective of this invention is to provide a method for preparing a refractory high-entropy alloy with high plasticity and high toughness, comprising the following steps:

[0010] (S1) Place the pretreated Hf, Ta, Zr, Nb, Ti, Mo and V metal raw materials in order from low melting point to high melting point to obtain pre-made raw materials;

[0011] (S2) Pure Ti (which is not part of the refractory high entropy alloy and is intended to consume oxygen in the melting furnace during the further melting process) and the pre-prepared raw material obtained in step (S1) are placed in the melting furnace respectively. After post-treatment, the pure Ti is pre-melted, and then the pre-prepared raw material is melted to obtain a refractory high entropy alloy with high plasticity and high toughness.

[0012] In one embodiment of the present invention, in step (S1), the metal raw material is rod-shaped, block-shaped, sheet-shaped, column-shaped, or irregularly shaped particles other than powder.

[0013] In one embodiment of the present invention, in step (S1), the pretreatment is ultrasonic cleaning followed by drying.

[0014] In one embodiment of the present invention, during the ultrasonic cleaning process, the ultrasonic cleaning is performed sequentially in acetone, ethanol and deionized water for 20 min to 40 min.

[0015] During the drying process, the temperature is 100℃ and the time is 20 minutes.

[0016] In one embodiment of the present invention, in step (S2), the post-processing involves evacuating the melting furnace and then introducing high-purity argon gas.

[0017] Vacuum was drawn until the vacuum level in the furnace cavity reached 9×10⁻⁶. -3 Below Pa;

[0018] The pressure of high-purity argon gas introduced into the furnace cavity reaches 0.01 Pa to 0.1 Pa.

[0019] In one embodiment of the present invention, after evacuation, high-purity argon gas is introduced and repeated more than 3 times, with the last introduction of high-purity argon gas reaching a pressure of 0.06 Pa in the furnace cavity of the melting furnace.

[0020] In one embodiment of the present invention, in step (S2), the pure Ti is melted 2 to 5 times.

[0021] In one embodiment of the present invention, during the pure Ti smelting process, the current is 300A, the voltage is 5V, and the time is 3min.

[0022] In one embodiment of the present invention, in step (S3), the pre-made raw materials are smelted three or more times;

[0023] The pre-made raw material smelting process includes non-magnetic stirring smelting process and magnetic stirring smelting process.

[0024] In one embodiment of the present invention, the non-magnetic stirring melting is performed twice, and the magnetic stirring melting is performed once or more.

[0025] During the pre-made raw material smelting process, the current is 400A~550A, the voltage is 10V~18V, the magnetic separation stirring current is 0~5A, and the time is 3min.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The high-plasticity and high-toughness refractory high-entropy alloy of the present invention is mainly composed of BCC phase, with a small amount of HCP phase. The alloy has a uniform microstructure, high room temperature hardness, yield strength and compressive strength, and good room temperature fracture toughness. Attached Figure Description

[0028] Figure 1 For Hf 55 Zr 20 Nb 15 Ti 10 XRD pattern of a high-entropy alloy;

[0029] Figure 2 For Hf 55 Zr 20 Nb 15 Ti 10 Schematic diagram of a secondary electron image of a high-entropy alloy using SEM;

[0030] Figure 3 For Hf 55 Zr 20 Nb 15 Ti 10 Compressive stress-strain curves of high-entropy alloys;

[0031] Figure 4 For Hf 30 Ta 25 Nb 25 Ti 15 XRD pattern of Mo5 high-entropy alloy;

[0032] Figure 5 For Hf 30 Ta 25 Nb 25 Ti 15 Compression stress-strain curve of Mo5 high-entropy alloy;

[0033] Figure 6 For Hf 40 Ta 20 Nb 20 Ti 15 XRD pattern of V5 high-entropy alloy;

[0034] Figure 7 For Hf 40 Ta 20 Nb 20 Ti 15 Compression stress-strain curve of V5 high-entropy alloy. Detailed Implementation

[0035] This invention provides a refractory high-entropy alloy with high plasticity and high toughness. The constituent elements of the refractory high-entropy alloy are Hf, Nb and Ti, or the constituent elements of the refractory high-entropy alloy are Hf, Nb, Ti and X, wherein X is selected from one or more of Ta, Zr, Mo or V.

[0036] The refractory high-entropy alloy has a BCC structure crystal plane.

[0037] In one embodiment of the present invention, the atomic percentage content of Hf in the refractory high entropy alloy is 45% to 80%, the atomic percentage content of Ta is 0 to 30%, the atomic percentage content of Zr is 0 to 35%, the atomic percentage content of Nb is 3% to 35%, the atomic percentage content of Ti is 0.5% to 20%, the atomic percentage content of Mo is 0 to 15%, and the atomic percentage content of V is 0 to 15%.

[0038] This invention provides a method for preparing a refractory high-entropy alloy with high plasticity and high toughness, comprising the following steps:

[0039] (S1) Place the pretreated Hf, Ta, Zr, Nb, Ti, Mo and V metal raw materials in order from low melting point to high melting point to obtain pre-made raw materials;

[0040] (S2) Pure Ti (which is not part of the refractory high entropy alloy and is intended to consume oxygen in the melting furnace during the further melting process) and the pre-prepared raw material obtained in step (S1) are placed in the melting furnace respectively. After post-treatment, the pure Ti is pre-melted, and then the pre-prepared raw material is melted to obtain a refractory high entropy alloy with high plasticity and high toughness.

[0041] In one embodiment of the present invention, in step (S1), the pretreatment is ultrasonic cleaning followed by drying.

[0042] In one embodiment of the present invention, during the ultrasonic cleaning process, the ultrasonic cleaning is performed sequentially in acetone, ethanol and deionized water for 20 min to 40 min.

[0043] During the drying process, the temperature is 100℃ and the time is 20 minutes.

[0044] In one embodiment of the present invention, in step (S2), the post-processing involves evacuating the melting furnace and then introducing high-purity argon gas.

[0045] Vacuum was drawn until the vacuum level in the furnace cavity reached 9×10⁻⁶. -3 Below Pa;

[0046] The pressure of high-purity argon gas introduced into the furnace cavity reaches 0.01 Pa to 0.1 Pa.

[0047] In one embodiment of the present invention, after evacuation, high-purity argon gas is introduced and repeated more than 3 times, with the last introduction of high-purity argon gas reaching a pressure of 0.06 Pa in the furnace cavity of the melting furnace.

[0048] In one embodiment of the present invention, in step (S2), the pure Ti is melted 2 to 5 times.

[0049] In one embodiment of the present invention, during the pure Ti smelting process, the current is 300A, the voltage is 5V, and the time is 3min.

[0050] In one embodiment of the present invention, in step (S3), the pre-made raw materials are smelted three or more times;

[0051] The pre-made raw material smelting process includes non-magnetic stirring smelting process and magnetic stirring smelting process.

[0052] In one embodiment of the present invention, the non-magnetic stirring melting is performed twice, and the magnetic stirring melting is performed once or more.

[0053] During the pre-made raw material smelting process, the current is 400A~550A, the voltage is 10V~18V, the magnetic separation stirring current is 0~5A, and the time is 3min.

[0054] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0055] Unless otherwise specified, all reagents used in the following embodiments are commercially available reagents, and all detection methods and techniques used are conventional detection methods and techniques in the art.

[0056] Example 1

[0057] This embodiment provides an Hf 55 Zr 20 Nb 15 Ti 10 Refractory high-entropy alloys.

[0058] A refractory high-entropy alloy with the composition Hf-Zr-Nb-Ti, wherein the atomic percentages of each refractory metal are Hf:Zr:Nb:Ti = 55:20:15:10, and the purity of all refractory metals used is above 99.5%. The preparation process of this refractory high-entropy alloy is as follows:

[0059] (S1) Cleaning: The selected refractory metals were ultrasonically cleaned sequentially in acetone, ethanol, and deionized water for 30 minutes each, and then dried in an oven at 100°C for 20 minutes to obtain dried refractory metals for later use; the selected refractory metals Hf, Zr, Nb, and Ti were all... A cylinder;

[0060] (S2) Ingredients: According to the atomic percentage of Hf:Zr:Nb:Ti = 55:20:15:10, use an electronic balance with an accuracy of 0.001g to weigh the refractory metal particles that have been ultrasonically cleaned in step (S1); then weigh 50g of pure Ti cleaned in (S1);

[0061] (S3) Feeding: First, put 50g of pure Ti from step (S2) into any water-cooled copper crucible in the smelting furnace; then, put the refractory metal weighed in (S2) in order from low melting point to high melting point into any water-cooled copper crucible with magnetic stirring, in preparation for smelting.

[0062] (S4) Furnace cleaning: Evacuate the furnace cavity to a vacuum level of 9×10⁻⁶. -3 Below Pa, high-purity argon gas with a purity of 99.999% or higher is introduced to bring the pressure inside the furnace cavity to 0.01–0.1 Pa. Then, the vacuum degree of the furnace cavity is evacuated to 9 × 10⁻⁶ Pa. -3 Repeat this process twice to clean the vacuum chamber, and finally fill it with the above-mentioned high-purity argon gas to make the furnace chamber pressure 0.06 Pa.

[0063] (S5) Melting: Under the argon atmosphere described in (S4), the pure Ti in step (S3) is first melted twice to eliminate residual oxygen in the melting furnace. The process parameters are as follows: current 300A, voltage 5V, melting time 3 minutes. Then, the refractory metal pre-placed in (S2) is melted (five times in total). The first two times are without electromagnetic stirring to ensure that all the refractory metals are melted. From the 3rd to the 5th times, electromagnetic stirring is performed to ensure that all the refractory metals are uniformly mixed. After each melting, the sample is cooled with the furnace and turned over. Finally, the desired refractory high-entropy alloy is obtained. The process parameters of the refractory high-entropy alloy are as follows: current 400A, voltage 10V, magnetic stirring current 5A (when there is no electromagnetic stirring, the magnetic stirring current is 0A), melting time 3 minutes.

[0064] This implementation case obtained an Hf with a BCC+HCP structure. 55 Zr 20 Nb 15 Ti 10 Refractory high-entropy alloys, such as Figure 1 As shown, according to the law of extinction of lattice diffraction, it can be determined that... Figure 1 The XRD pattern shown not only exhibits typical BCC structure crystal planes but also typical HCP structure crystal planes, indicating that this Hf 55 Zr 20 Nb 15 Ti 10 Refractory high-entropy alloys possess a BCC+HCP structure. Further SEM characterization revealed, for example... Figure 2 As shown, the presence of both black and white regions in the electronic image confirms the XRD characterization results, indicating that this refractory high-entropy alloy contains two phases: BCC and HCP. The density, Rockwell hardness, compressive properties, and fracture toughness of this refractory high-entropy alloy were tested according to standard Archimedes' principle, GB / T 230-1991, GB / T7314-1987, and GB / T 14452-1993, respectively. The results are as follows... Figure 3 As shown in Table 1, this refractory high-entropy alloy exhibits excellent yield strength exceeding 1311 MPa, compressive strength exceeding 1400 MPa, compressive fracture strain of approximately 6%, and fracture toughness of 18 MPa·m. 0.5 This indicates the prepared Hf 55 Zr 20 Nb 15 Ti 10 Refractory high-entropy alloys have high hardness, yield strength, compressive strength and fracture toughness.

[0065] Table 1 Hf 55 Zr 20 Nb 15 Ti 10Density, hardness, and mechanical properties of refractory high-entropy alloys

[0066]

[0067] Example 2

[0068] This embodiment provides an Hf 30 Ta 25 Nb 25 Ti 15 Mo5 is a refractory high-entropy alloy.

[0069] A refractory high-entropy alloy with the composition Hf-Ta-Nb-Ti-Mo, wherein the atomic percentages of each refractory metal are Hf:Ta:Nb:Ti:Mo = 30:25:25:15:5, and the purity of all refractory metals used is above 99.5%. The preparation process of this refractory high-entropy alloy is as follows:

[0070] (S1) Cleaning: The selected refractory metals were ultrasonically cleaned sequentially in acetone, ethanol, and deionized water for 30 minutes each, and then dried in an oven at 100°C for 30 minutes to obtain dried refractory metals for later use; the selected refractory metals Hf, Ta, Nb, Ti, and Mo were all... A cylinder;

[0071] (S2) Ingredients: According to the atomic percentage of Hf:Ta:Nb:Ti:Mo = 30:25:25:15:5, use an electronic balance with an accuracy of 0.001g to weigh the refractory metal particles that have been ultrasonically cleaned in step (S1); then weigh 50g of pure Ti cleaned in step (S1);

[0072] (S3) Feeding: First, put 50g of pure Ti from (S2) into any water-cooled copper crucible in the smelting furnace; then, put the refractory metal weighed in (S2) according to the proportion into any water-cooled copper crucible with magnetic stirring in order from low melting point to high melting point, in preparation for smelting.

[0073] (S4) Furnace cleaning: Evacuate the furnace cavity to a vacuum level of 9×10⁻⁶. -3 Below Pa, high-purity argon gas with a purity of 99.999% or higher is introduced to bring the pressure inside the furnace cavity to 0.01–0.1 Pa. Then, the vacuum degree of the furnace cavity is evacuated to 9 × 10⁻⁶ Pa. -3 Repeat this process twice to clean the vacuum chamber, and finally fill it with the above-mentioned high-purity argon gas to make the furnace chamber pressure 0.06 Pa.

[0074] (S5) Melting: Under the argon atmosphere described in (S4), the pure Ti in (S3) is first melted 3 times to eliminate residual oxygen in the melting furnace. The process parameters are as follows: current 300A, voltage 5V, melting time 3 minutes. Then, the refractory metal pre-placed in (S2) is melted (a total of five times). The first two times are without electromagnetic stirring to ensure that all the refractory metals are melted. From the 3rd to the 5th time, electromagnetic stirring is performed to ensure that all the refractory metals are uniformly mixed. After each melting, the sample is cooled with the furnace and turned over. Finally, the desired refractory high-entropy alloy is obtained. The process parameters of the refractory high-entropy alloy are as follows: current 450A, voltage 15V, magnetic stirring current 5A (when there is no electromagnetic stirring, the magnetic stirring current is 0A), melting time 3 minutes.

[0075] This implementation case obtained an Hf with a BCC structure. 30 Ta 25 Nb 25 Ti 15 Mo5 refractory high-entropy alloys, such as Figure 4 As shown, according to the law of extinction of lattice diffraction, it can be determined that... Figure 4 The XRD pattern shown not only exhibits typical (110), (200), (211), (220), and (310) structural crystal planes, indicating that this Hf 30 Ta 25 Nb 25 Ti 15 Mo5 refractory high-entropy alloy possesses a BCC structure. The density, Rockwell hardness, compressive properties, and fracture toughness of this refractory high-entropy alloy were tested according to standard Archimedes' principle, GB / T 230-1991, GB / T 7314-1987, and GB / T 14452-1993, respectively. The results are as follows: Figure 5 As shown in Table 2, this refractory high-entropy alloy exhibits excellent yield strength exceeding 851 MPa, compressive strength exceeding 1200 MPa, compressive fracture strain of approximately 38.4%, and fracture toughness of 88 MPa·m. 0.5 This indicates the prepared Hf 30 Ta 25 Nb 25 Ti 15 Mo5 refractory high-entropy alloy has high hardness, yield strength, compressive strength and fracture toughness.

[0076] Table 2 Hf 30 Ta 25 Nb 25 Ti 15 Density, hardness, and mechanical properties of Mo5 refractory high-entropy alloy

[0077]

[0078] Example 3

[0079] This embodiment provides an Hf 40 Ta 20 Nb 20 Ti 15 V5 is a refractory high-entropy alloy.

[0080] A refractory high-entropy alloy with the composition Hf-Ta-Nb-Ti-V, wherein the atomic percentages of each refractory metal are Hf:Ta:Nb:Ti:V = 40:20:20:15:5, and the purity of all refractory metals used is above 99.5%. The preparation process of this refractory high-entropy alloy is as follows:

[0081] (S1) Cleaning: The selected refractory metals were ultrasonically cleaned sequentially in acetone, ethanol, and deionized water for 30 minutes each, and then dried in an oven at 100°C for 40 minutes to obtain dried refractory metals for later use; among which, the selected refractory metals Hf, Ta, Nb, Ti, and V are all... A cylinder;

[0082] (S2) Ingredients: According to the atomic percentage of Hf:Ta:Nb:Ti:V = 40:20:20:15:5, use an electronic balance with an accuracy of 0.001g to weigh the refractory metal particles that have been ultrasonically cleaned in step (S1); then weigh 50g of pure Ti cleaned in step (S1);

[0083] (S3) Feeding: First, put 50g of pure Ti from step (S2) into any water-cooled copper crucible in the smelting furnace; then, put the refractory metal weighed according to the proportion in [2] into any water-cooled copper crucible with magnetic stirring in order from low melting point to high melting point, in preparation for smelting;

[0084] (S4) Furnace cleaning: Evacuate the furnace cavity to a vacuum level of 9×10⁻⁶. -3 Below Pa, high-purity argon gas with a purity of 99.999% or higher is introduced to bring the pressure inside the furnace cavity to 0.01–0.1 Pa. Then, the vacuum degree of the furnace cavity is evacuated to 9 × 10⁻⁶ Pa. -3 Repeat this process twice to clean the vacuum chamber, and finally fill it with the above-mentioned high-purity argon gas to make the furnace chamber pressure 0.06 Pa.

[0085] (S5) Melting: Under the argon atmosphere described in step (S4), the pure Ti in step (S3) is first melted 5 times to eliminate residual oxygen in the melting furnace. The process parameters are as follows: current 300A, voltage 5V, melting time 3 minutes. Then, the refractory metal pre-placed in step (S2) is melted (a total of five times). The first two times are without electromagnetic stirring to ensure that all the refractory metals are melted. From the 3rd to the 5th time, electromagnetic stirring is performed to ensure that all the refractory metals are uniformly mixed. After each melting, the sample is cooled with the furnace and turned over. Finally, the desired refractory high-entropy alloy is obtained. The process parameters of the refractory high-entropy alloy are as follows: current 550A, voltage 18V, magnetic stirring current 5A (when there is no electromagnetic stirring, the magnetic stirring current is 0A), melting time 3 minutes.

[0086] This implementation case obtained an Hf with a BCC structure. 40 Ta 20 Nb 20 Ti 15 V5 refractory high-entropy alloys, such as Figure 6 As shown, according to the law of extinction of lattice diffraction, it can be determined that... Figure 6 The XRD pattern shown not only exhibits typical (110), (200), (211), (220), and (310) structural crystal planes, indicating that this Hf 40 Ta 20 Nb 20 Ti 15 V5 refractory high-entropy alloy possesses a BCC structure. Further SEM characterization revealed that the density, Rockwell hardness, compressive properties, and fracture toughness of this refractory high-entropy alloy were tested according to standard Archimedes' principle, GB / T230-1991, GB / T 7314-1987, and GB / T 14452-1993, respectively. The results are as follows: Figure 7 As shown in Table 3, this refractory high-entropy alloy exhibits excellent yield strength exceeding 733 MPa, compressive strength exceeding 4462 MPa, compressive fracture strain of approximately 50.7%, and fracture toughness of 39.4 MPa·m. 0.5 This indicates the prepared Hf 40 Ta 20 Nb 20 Ti 15 V5 refractory high-entropy alloy has high hardness, yield strength, compressive strength and fracture toughness.

[0087] Table 3Hf 40 Ta 20 Nb 20 Ti 15 Density, hardness, and mechanical properties of V5 refractory high-entropy alloy

[0088]

[0089] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the interpretation of the present invention, without departing from the scope of the invention, should be within the protection scope of the present invention.

Claims

1. A refractory high-entropy alloy with high plasticity and high toughness, characterized in that, The constituent elements of refractory high entropy alloys are Hf, Nb and Ti, or the constituent elements of refractory high entropy alloys are Hf, Nb, Ti and X, wherein X is selected from one or more of Ta, Zr, Mo or V; The refractory high-entropy alloy has BCC and HCP structure crystal planes; In refractory high-entropy alloys, the atomic percentage content of Hf is 55%~80%, Ta is 0%~30%, Zr is 0%~20%, Nb is 15%~35%, Ti is 10%~20%, Mo is 0%~15%, and V is 0%~15%; the sum of the atomic percentage contents of all elements in the refractory high-entropy alloy is 100%. Among them, the refractory high-entropy alloy with high plasticity and high toughness is prepared by the following method: (S1) Place the pretreated Hf, Ta, Zr, Nb, Ti, Mo and V metal raw materials in order from low melting point to high melting point to obtain the pre-made raw materials; (S2) Pure Ti and the preform prepared in step (S1) are placed in a melting furnace. After post-treatment, pure Ti is pre-melted to consume the oxygen in the melting furnace. Then the preform is melted to obtain a refractory high-entropy alloy with high plasticity and high toughness.

2. The refractory high-entropy alloy with high plasticity and high toughness according to claim 1, characterized in that, In step (S1), the pretreatment is ultrasonic cleaning followed by drying.

3. The refractory high-entropy alloy with high plasticity and high toughness according to claim 1, characterized in that, In step (S2), the post-processing involves evacuating the melting furnace and then introducing high-purity argon gas. Vacuum was drawn until the vacuum level in the furnace cavity reached 9×10⁻⁶. -3 Below Pa; The pressure of high-purity argon gas introduced into the furnace cavity of the melting furnace reaches 0.01 Pa to 0.1 Pa.

4. A refractory high-entropy alloy with high plasticity and high toughness according to claim 3, characterized in that, After evacuation, high-purity argon gas is introduced and repeated more than 3 times. The last time high-purity argon gas is introduced, the pressure in the furnace cavity of the melting furnace reaches 0.06 Pa.

5. A refractory high-entropy alloy with high plasticity and high toughness according to claim 1, characterized in that, In step (S2), the pure Ti is smelted 2 to 5 times.

6. A refractory high-entropy alloy with high plasticity and high toughness according to claim 5, characterized in that, During the pure Ti smelting process, the current is 300A, the voltage is 5V, and the time is 3min.

7. A refractory high-entropy alloy with high plasticity and high toughness according to claim 1, characterized in that, In step (S3), the pre-made raw materials are smelted more than 3 times; The pre-made raw material smelting process includes non-magnetic stirring smelting process and magnetic stirring smelting process.

8. A refractory high-entropy alloy with high plasticity and high toughness according to claim 7, characterized in that, The non-magnetic stirring and melting process is repeated twice, while the magnetic stirring and melting process is repeated more than once. During the pre-made raw material smelting process, the current is 400A~550A, the voltage is 10V~18V, the magnetic separation stirring current is 0~5A, and the time is 3min.

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