A high-strength refractory high-entropy alloy with low density, excellent tensile ductility, a preparation method and applications thereof

Abstract

This invention provides a high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity, its preparation method, and its applications. The high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity is characterized by comprising the following components in atomic percentage: Al 4-7%, Mo 4%-8%, Ti 37%-43%, Nb 33%-40%, Hf 12-13%, and B 0.1-0.5%. The atomic percentages of the six elements add up to 100%. This invention also discloses a method for preparing the high-strength, refractory, high-entropy alloy. The density of the high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity in this invention is 7.5-7.7 g / cm³. 3 With a tensile yield strength close to 1100 MPa and a tensile elongation between 13% and 18%, the high-strength refractory high-entropy alloy of this invention can be used as a high-strength structural component in high-temperature environments.

Description

Technical Field

[0001] This invention relates to high-entropy alloy technology, and more particularly to a high-strength refractory high-entropy alloy with low density and excellent tensile plasticity, its preparation method and applications. Background Technology

[0002] High-temperature materials are widely used in aerospace, automotive manufacturing, and military defense, playing a crucial role in technological development, social progress, and national security. Current advancements in science and technology are placing increasingly stringent demands on the extreme operating environments of high-temperature materials. However, existing iron-based, nickel-based, and cobalt-based high-temperature alloys are limited by their melting points, making it difficult to further improve their high-temperature performance. Therefore, there is an urgent need to develop new high-temperature alloy materials.

[0003] The concept of refractory high-entropy alloys was proposed in 2010 based on the concept of high-entropy alloys. These alloys are characterized by the use of all or part of high-melting-point elements such as Mo, Nb, Ta, Hf, W, Ti, Zr, and V, resulting in alloys with excellent high-temperature properties. Some refractory high-entropy alloys exhibit better high-temperature mechanical properties than nickel-based alloys. However, the extensive use of these intrinsically brittle elements leads to high density and poor room-temperature plasticity, severely limiting their subsequent deformation processing capabilities and thus their potential applications. Therefore, there is an urgent need to design a refractory high-entropy alloy with low density, high yield strength, and good deformation plasticity. Summary of the Invention

[0004] The purpose of this invention is to address the problems of high density and poor room temperature plasticity of traditional refractory high entropy alloys by proposing a high-strength refractory high entropy alloy with low density and excellent tensile plasticity, so that the alloy has low density, high yield strength, room temperature tensile plasticity and good high temperature performance.

[0005] To achieve the above objectives, the technical solution adopted in this invention is: a high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity, comprising the following components in atomic percentage: Al 4%-7%, Mo 4%-8%, Ti 37%-43%, Nb 33%-40%, Hf 12-13%, and B 0.1-0.5%. The atomic percentages of the six elements add up to 100%.

[0006] Furthermore, the high-strength refractory high-entropy alloy with low density and excellent tensile plasticity comprises the following components in atomic percentage: Al 4.5%-5%, Mo 4.5%-7%, Ti 37%-43%, Nb 35%-36%, Hf 12%-13%, and B 0.1%-0.5%.

[0007] Furthermore, the density of high-strength refractory high-entropy alloys with low density and excellent tensile plasticity is 7.5-7.7 g / cm³. 3 .

[0008] Another object of the present invention discloses a method for preparing a high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity, comprising the following steps:

[0009] Step (1) Remove the oxide scale from the surface of Al, Mo, Nb, Ti and Hf raw materials and clean them using ultrasound and alcohol;

[0010] Step (2) Place the raw materials into the electric arc furnace crucible in order of melting point, ensuring that the low melting point material is at the bottom of the crucible and place element B in the middle of the above five elements;

[0011] Step (3) Close the door of the electric arc furnace, evacuate the electric arc furnace to a vacuum state, and introduce high-purity argon gas for gas anti-oxidation protection;

[0012] Step (4) Arc melting is carried out in an argon atmosphere. First, the Ti ingot in the electric arc furnace is melted to detect and consume trace amounts of oxygen in the furnace, ensuring that the Ti is completely melted and then solidified. After the Ti ingot cools and solidifies, the metal materials in the crucible are melted to ensure that all metal materials are completely melted and mixed evenly. The ingot is then cooled and solidified into a whole. The alloy ingot is flipped over and melted again. The melting is repeated until all components in the alloy are evenly mixed. After the melting is completed, the sample is taken out after cooling to room temperature. The sample is rolled and recrystallized at room temperature to obtain the AlMoNbTiHfB series high entropy alloy.

[0013] Further, in step (1), the oxide scale on the surface of the Al, Mo, Nb, Ti, and Hf raw materials is removed by sanding with sandpaper or a grinding wheel.

[0014] Furthermore, in step (3), the vacuum degree inside the vacuum arc melting furnace is evacuated to 6.0 × 10⁻⁶. -2 Below Pa.

[0015] Furthermore, in step (4), the argon atmosphere pressure should be lower than the ambient pressure.

[0016] Furthermore, the smelting current in step (4) should be greater than 300A.

[0017] Further, step (4) is repeated 3-8 times until all the components in the alloy are mixed evenly.

[0018] Furthermore, the room temperature rolling and recrystallization annealing includes the following steps:

[0019] S1 processes the ingot obtained after complete cooling following melting to obtain a smooth ingot with parallel upper and lower surfaces.

[0020] S2 cold rolls the ingot to be processed at room temperature, and the final reduction after rolling is 75% or more;

[0021] S3 involves heat-treating the rolled and deformed ingot in a heat treatment furnace.

[0022] Furthermore, after processing, the ingot in S1 should ensure that the upper and lower rolling surfaces are parallel to each other, and that both surfaces are smooth without stains or obvious protrusions.

[0023] Furthermore, the total ingot reduction during the S2 rolling process is 75% or more, with the preferred total ingot reduction being 75%-80%.

[0024] Furthermore, S3 isolates oxygen from heat treatment of the rolled and deformed ingot, for example, by sealing the ingot in a quartz tube for heat treatment.

[0025] Further, in step S3, the rolled and deformed ingot is placed directly from room temperature in an environment of 800-870°C for 25-30 minutes and then water-quenched; then the material is placed in an environment of 550-650°C for 25-30 minutes and then water-quenched. Preferably, in step S3, the rolled and deformed ingot is placed directly from room temperature in an environment of 850°C for 30 minutes and then water-quenched; then the material is placed in an environment of 600°C for 30 minutes and then water-quenched.

[0026] After melting, room temperature rolling and recrystallization annealing are performed. The rolling reduction, annealing temperature, and other process parameters all affect the final properties of the alloy. For example, the properties of a sample deformed by 75% are completely different from those of a sample deformed by 85%. Similarly, if two samples are simultaneously deformed by 75%, and then heat-treated at 800℃ and 400℃ respectively, the resulting alloys will also have different properties. Therefore, the amount of rolling deformation, the choice of heat treatment temperature and time are all part of the process and influence the final properties of the alloy.

[0027] Another object of the present invention discloses the application of a high-strength refractory high-entropy alloy with low density and excellent tensile plasticity in the field of high-strength structural components. This high-strength refractory high-entropy alloy with low density and excellent tensile plasticity can be used as a high-strength structural component in high-temperature environments.

[0028] This invention relates to a high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity, its preparation method, and its applications. Compared with existing technologies, it has the following advantages:

[0029] (1) In this invention, high-melting-point elements Mo, Nb, Ti, Hf, and B are selected to give the alloy a high melting point and good high-temperature mechanical properties. At the same time, elements such as Al, Ti, and B have low densities, resulting in an overall low density of the alloy. The density of the series of alloys measured using the Archimedes displacement method is 7.5-7.7 g / cm³. 3 Compared to nickel-based superalloys (8.0-9.2 g / cm³), 3 It has a lower density.

[0030] (2) Room temperature tensile tests were conducted on this series of alloys, and it was found that the room temperature tensile yield strength of the material was 1050MPa–1250MPa and the tensile elongation was 10%–18%. Its comprehensive mechanical properties are superior to those of existing refractory high entropy alloys.

[0031] (3) Phase diagram calculations show that the theoretical melting point of this series of alloys exceeds 1600℃, which gives this series of alloys good high-temperature performance.

[0032] In summary, the high-strength refractory high-entropy alloy of the present invention, with its low density and excellent tensile plasticity, can be used as a high-strength structural component in industrial production under high-temperature conditions. At the same time, its excellent deformation capacity provides sufficient safety margin, making it an excellent structural material. Attached Figure Description

[0033] Figure 1 It is the (Al5Mo5Nb) prepared in Example 1 of this invention. 36 Ti 41 Hf 13 ) 99.9 B 0.1 Room temperature stretching curve;

[0034] Figure 2 This is the (Al5Mo7Nb) prepared in Example 2 of the present invention. 36 Ti 39 Hf 13 ) 99.7 B 0.3 Room temperature stretching curve;

[0035] Figure 3 It is the (Al5Mo5Nb) prepared in Example 3 of this invention. 36 Ti 41 Hf 13 ) 99.5 B 0.5 Phase diagram calculation results for the alloy;

[0036] Figure 4 It is the (Al5Mo7Nb) prepared in Example 4 of this invention. 36 Ti 39 Hf 13 ) 99.5B 0.5 Phase diagram calculation results for the alloy. Detailed Implementation

[0037] The present invention will be further described below with reference to the embodiments:

[0038] Example 1

[0039] This high-strength, refractory, high-entropy alloy material, characterized by low density and excellent tensile plasticity, is composed of six elements: Al, Mo, Nb, Ti, Hf, and B, and is denoted by the atomic molar ratio (Al₅Mo₅Nb₂). 36 Ti 41 Hf 13 ) 100-x B x In this embodiment, X = 0.1.

[0040] The preparation method of this refractory high-entropy alloy material with excellent tensile plasticity and high strength in a single-phase BCC structure includes the following steps:

[0041] Step 1: Select the block materials of the above five elements, use a grinding wheel and sandpaper to grind away the surface oxide scale, and then perform ultrasonic cleaning pretreatment.

[0042] Step 2: Place the five blocks that have been pretreated in Step 1 into the vacuum arc melting furnace in order of increasing melting point, with the element with the lowest melting point at the bottom and element B in the middle of the five elements.

[0043] Step 3: Then, perform a vacuum treatment on the furnace, evacuating it to 6×10⁻⁶. -2 After the pressure drops below Pa, 99.9 wt% high-purity argon gas is introduced into the furnace cavity for oxidation protection, ensuring that the gas pressure inside the furnace is lower than the ambient gas pressure outside the furnace.

[0044] Step 4: First, the arc is ignited to melt the Ti ingot in the furnace to eliminate residual oxygen, allowing the pure titanium to melt and remain in a liquid state for a certain period. Then, the arc is turned off to allow the Ti ingot to cool and solidify completely. After observing that the Ti ingot surface exhibits a silvery-white metallic luster, the alloy melting process begins. The temperature is raised until all metallic elements melt and maintained in a liquid state for at least 30 seconds. Then, the power is cut off. After the master alloy ingot solidifies, it is flipped using a robotic arm, and the same method is used to continue melting the alloy, for a total of 6 melting cycles. After the 3rd melting cycle, electromagnetic stirring is activated during the melting process to ensure more uniform mixing of the master alloy ingot. In this embodiment, the melting current of the vacuum arc melting furnace is within the range of 100-600A.

[0045] Step 5: Process the smelted ingot to obtain a smooth ingot with parallel upper and lower surfaces.

[0046] Step 6: Perform room temperature cold rolling on the ingot obtained in the above steps. The reduction amount in each pass is 0.15 mm. After multiple rolling processes, the final reduction amount is 75%.

[0047] Step 7: Tightly wrap the rolled ingot (75% deformation) with iron foil, then hold it at 850℃ for 30 minutes and quench it in water. Repeat the process of wrapping it with iron foil again, holding it at 600℃ for 30 minutes, and then quenching it in water. The final result is the high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity, as described in Example 1.

[0048] Appendix Figure 1 Example 1 (Al5Mo5Nb) 36 Ti 41 Hf 13 ) 99.9 B 0.1 The room temperature tensile stress-strain curves of the refractory high-entropy alloy are shown in the figure. It can be seen that the yield strength of Example 1 exceeds 1 GPa and the elongation after fracture exceeds 16%, exhibiting excellent comprehensive mechanical properties.

[0049] Example 2

[0050] This high-strength, refractory, high-entropy alloy material, characterized by low density and excellent tensile plasticity, is composed of six elements: Al, Mo, Nb, Ti, Hf, and B, and is denoted by the atomic molar ratio (Al5Mo7Nb). 36 Ti 39 Hf 13 ) 100-x B x In this embodiment, X = 0.3.

[0051] The preparation method of this high-strength, refractory, high-entropy alloy material with low density and excellent tensile plasticity includes the following steps:

[0052] Step 1: Select bulk materials containing the five elements Al, Mo, Nb, Ti, and Hf, and use a grinding wheel and sandpaper to remove the surface oxide scale, and perform ultrasonic cleaning pretreatment; B is added to the alloy in powder form.

[0053] Step 2: Place the five blocks that have been pretreated in Step 1 into the vacuum arc melting furnace in order of increasing melting point, with the element with the lowest melting point at the bottom and element B in the middle.

[0054] Step 3: Then, perform a vacuum treatment on the furnace, evacuating it to 6×10⁻⁶. -2 After the pressure drops below Pa, 99.9 wt% high-purity argon gas is introduced into the furnace cavity for oxidation protection, ensuring that the gas pressure inside the furnace is lower than the ambient gas pressure outside the furnace.

[0055] Step 4: First, the arc is ignited to melt the Ti ingot in the furnace to eliminate residual oxygen, allowing the pure titanium to melt and remain in a liquid state for a certain period. Then, the arc is turned off to allow the Ti ingot to cool and solidify completely. After observing that the Ti ingot surface exhibits a silvery-white metallic luster, the alloy melting process begins. The temperature is raised until all metallic elements melt and maintained in a liquid state for at least 30 seconds. Then, the power is cut off. After the master alloy ingot solidifies, it is flipped using a robotic arm, and the same method is used to continue melting the alloy, for a total of 6 melting cycles. After the 3rd melting cycle, electromagnetic stirring is activated during the melting process to ensure more uniform mixing of the master alloy ingot. In this embodiment, the melting current of the vacuum arc melting furnace is within the range of 100-600A.

[0056] Step 5: Process the smelted ingot to obtain a smooth ingot with parallel upper and lower surfaces.

[0057] Step 6: Perform room temperature cold rolling on the ingot obtained in the above steps. The reduction amount in each pass is 0.15 mm. After multiple rolling processes, the final reduction amount is 75%.

[0058] Step 7: Use iron foil to tightly wrap the plate after it has been rolled and deformed by 75%, then hold it at 850°C for 30 minutes and then quench it in water. Then wrap it with iron foil again, hold it at 600°C for 30 minutes and then quench it in water. Finally, the high-strength refractory high-entropy alloy with low density and excellent tensile plasticity of Example 2 is obtained.

[0059] Appendix Figure 2 Example 2 (Al5Mo7Nb) 36 Ti 39 Hf 13 ) 99.7 B 0.3 The room temperature tensile stress-strain curves of the refractory high-entropy alloy are shown in the figure. It can be seen that the yield strength of Example 2 exceeds 1.08 GPa and the elongation after fracture exceeds 13%, demonstrating excellent comprehensive mechanical properties.

[0060] Example 3

[0061] This high-strength, refractory, high-entropy alloy material, characterized by low density and excellent tensile plasticity, is composed of six elements: Al, Mo, Nb, Ti, Hf, and B, and is denoted by the atomic molar ratio (Al₅Mo₅Nb₂). 36 Ti 41 Hf 13 ) 100-x B x In this embodiment, X = 0.5.

[0062] The preparation method of this high-strength, refractory, high-entropy alloy material with low density and excellent tensile plasticity includes the following steps:

[0063] Step 1: Select bulk materials containing the five elements Al, Mo, Nb, Ti, and Hf, and use a grinding wheel and sandpaper to remove the surface oxide scale, and perform ultrasonic cleaning pretreatment; B is added to the alloy in powder form.

[0064] Step 2: Place the five blocks that have been pretreated in Step 1 into the vacuum arc melting furnace in order of increasing melting point, with the element with the lowest melting point at the bottom and element B in the middle.

[0065] Step 3: Then, perform a vacuum treatment on the furnace, evacuating it to 6×10⁻⁶. -2 After the pressure drops below Pa, 99.9 wt% high-purity argon gas is introduced into the furnace cavity for oxidation protection, ensuring that the gas pressure inside the furnace is lower than the ambient gas pressure outside the furnace.

[0066] Step 4: First, the arc is ignited to melt the Ti ingot in the furnace to eliminate residual oxygen, allowing the pure titanium to melt and remain in a liquid state for a certain period. Then, the arc is turned off to allow the Ti ingot to cool and solidify completely. After observing that the Ti ingot surface exhibits a silvery-white metallic luster, the alloy melting process begins. The temperature is raised until all metallic elements melt and maintained in a liquid state for at least 30 seconds. Then, the power is cut off. After the master alloy ingot solidifies, it is flipped using a robotic arm, and the same method is used to continue melting the alloy, for a total of 6 melting cycles. After the 3rd melting cycle, electromagnetic stirring is activated during the melting process to ensure more uniform mixing of the master alloy ingot. In this embodiment, the melting current of the vacuum arc melting furnace is within the range of 100-600A.

[0067] Step 5: Process the smelted ingot to obtain a smooth ingot with parallel upper and lower surfaces.

[0068] Step 6: Perform room temperature cold rolling on the ingot obtained in the above steps. The reduction amount in each pass is 0.15 mm. After multiple rolling processes, the final reduction amount is 75%.

[0069] Step 7: Use iron foil to tightly wrap the plate after it has been rolled and deformed by 75%, then hold it at 850°C for 30 minutes and then quench it in water. Then wrap it with iron foil again, hold it at 600°C for 30 minutes and then quench it in water. Finally, the high-strength refractory high-entropy alloy with low density and excellent tensile plasticity of Example 3 is obtained.

[0070] Appendix Figure 3 Example 3 (Al5Mo5Nb) 36 Ti 41 Hf 13 ) 99.5 B 0.5 The room temperature tensile stress-strain curves of the refractory high-entropy alloy are shown in the figure. It can be seen that Example 3 has a single-phase BCC structure at high temperature, and its melting point exceeds 1600℃, which is higher than the melting point of most existing high-temperature alloys.

[0071] Example 4

[0072] This high-strength, refractory, high-entropy alloy material, characterized by low density and excellent tensile plasticity, is composed of six elements: Al, Mo, Nb, Ti, Hf, and B, and is denoted by the atomic molar ratio (Al5Mo7Nb). 36 Ti 39 Hf 13 ) 100-x B x In this embodiment, X = 0.5.

[0073] The preparation method of this high-strength, refractory, high-entropy alloy material with low density and excellent tensile plasticity includes the following steps:

[0074] Step 1: Select bulk materials containing the five elements Al, Mo, Nb, Ti, and Hf, and use a grinding wheel and sandpaper to remove the surface oxide scale, and perform ultrasonic cleaning pretreatment; B is added to the alloy in powder form.

[0075] Step 2: Place the five blocks that have been pretreated in Step 1 into the vacuum arc melting furnace in order of increasing melting point, with the element with the lowest melting point at the bottom and element B in the middle.

[0076] Step 3: Then, perform a vacuum treatment on the furnace, evacuating it to 6×10⁻⁶. -2 After the pressure drops below Pa, 99.9 wt% high-purity argon gas is introduced into the furnace cavity for oxidation protection, ensuring that the gas pressure inside the furnace is lower than the ambient gas pressure outside the furnace.

[0077] Step 4: First, the arc is ignited to melt the Ti ingot in the furnace to eliminate residual oxygen, allowing the pure titanium to melt and remain in a liquid state for a certain period. Then, the arc is turned off to allow the Ti ingot to cool and solidify completely. After observing that the Ti ingot surface exhibits a silvery-white metallic luster, the alloy melting process begins. The temperature is raised until all metallic elements melt and maintained in a liquid state for at least 30 seconds. Then, the power is cut off. After the master alloy ingot solidifies, it is flipped using a robotic arm, and the same method is used to continue melting the alloy, for a total of 6 melting cycles. After the 3rd melting cycle, electromagnetic stirring is activated during the melting process to ensure more uniform mixing of the master alloy ingot. In this embodiment, the melting current of the vacuum arc melting furnace is within the range of 100-600A.

[0078] Step 5: Process the smelted ingot to obtain a smooth ingot with parallel upper and lower surfaces.

[0079] Step 6: The ingot obtained in the above steps is subjected to room temperature cold rolling with a reduction of 0.15 mm per pass. After multiple rolling passes, the final reduction is 75%.

[0080] Step 7: Use iron foil to tightly wrap the plate after it has been rolled and deformed by 75%, then hold it at 850°C for 30 minutes and then quench it in water. Then wrap it with iron foil again, hold it at 600°C for 30 minutes and then quench it in water. Finally, the high-strength refractory high-entropy alloy with low density and excellent tensile plasticity of Example 4 is obtained.

[0081] Appendix Figure 4 Example 4 (Al5Mo7Nb) 36 Ti 39 Hf 13 ) 99.5 B 0.5 The room temperature tensile stress-strain curves of the refractory high-entropy alloy are shown in the figure. It can be seen that Example 4 has a single-phase BCC structure at high temperature, and its melting point exceeds 1600℃, which is higher than the melting point of most existing high-temperature alloys.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity, characterized in that, The composition includes the following components with the following atomic percentages: Al 4%-7%, Mo 4%-8%, Ti 37%-43%, Nb 33%-40%, Hf 12-13%, and B 0.1-0.5%; the sum of the atomic percentages of the six elements is 100%. This high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity has a density of 7.5-7.7 g / cm³. 3 The room temperature tensile yield strength is 1050 MPa – 1250 MPa, and the tensile elongation is 10% – 18%. The preparation method of the high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity includes the following steps: Step (1) Remove the oxide scale from the surface of Al, Mo, Nb, Ti and Hf raw materials and clean them using ultrasound and alcohol; Step (2) Place the raw materials into the electric arc furnace crucible in order of melting point, ensuring that the low melting point material is at the bottom of the crucible and place element B in the middle of the five elements; Step (3) Close the door of the electric arc furnace, evacuate the electric arc furnace to a vacuum state, and introduce high-purity argon gas for gas anti-oxidation protection; Step (4) Arc melting is carried out in an argon atmosphere. First, the Ti ingot in the electric arc furnace is melted to detect and consume the residual oxygen in the furnace and ensure that the Ti is completely melted. Then, wait for it to solidify. After the Ti ingot cools and solidifies, the metal materials in the crucible are melted to make all the metal materials completely melted and mixed evenly. Let it cool and solidify into a whole. Turn the alloy ingot over and melt it again. Repeat the melting until the various components in the alloy are mixed evenly. After the melting is completed, the sample is taken out after cooling to room temperature. It is rolled and recrystallized at room temperature to obtain AlMoNbTiHfB series high entropy alloy. The total reduction in ingot size during the room temperature rolling process is 75-80%; The recrystallization annealing involves placing the rolled and deformed ingot directly from room temperature in an environment of 800-870℃ for 25-30 minutes and then water quenching it; then, the material is placed in an environment of 550-650℃ for 25-30 minutes and then water quenched again.

2. The high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity according to claim 1, characterized in that, Step (3) The vacuum degree inside the vacuum arc melting furnace is evacuated to 6.0 × 10⁻⁶. -2 Below Pa.

3. The high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity according to claim 1, characterized in that, In step (4), the peak value of the smelting current should be greater than 300A.

4. The high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity according to claim 1, characterized in that, Step (4) Repeat the melting process 3-8 times until all the components in the alloy are evenly mixed.

5. The high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity according to claim 1, characterized in that, The room temperature rolling and recrystallization annealing includes the following steps: S1 processes the ingot obtained from smelting to obtain a smooth ingot with parallel upper and lower surfaces; S2 involves room temperature cold rolling of the ingot to be processed, resulting in a final reduction of 75-80% after rolling. S3 involves heat-treating the rolled and deformed ingot in a heat treatment furnace.

6. The high-strength, refractory, high-entropy alloy with low density and excellent tensile plasticity according to claim 5, characterized in that, S3 isolates oxygen for heat treatment of rolled and deformed ingots.

7. The use of the high-strength refractory high-entropy alloy with low density and excellent tensile plasticity as described in claim 1 in the field of high-strength structural components.

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