TiAlCrZrTa high-entropy alloy and preparation method thereof

Abstract

The invention discloses a TiAlCrZrTa high-entropy alloy and a preparation method of the TiAlCrZrTa high-entropy alloy. The TiAlCrZrTa high-entropy alloy is composed of a matrix phase and dispersion particles, wherein the matrix phase is TiAlCrZrTa, and the dispersion particles comprise Ti-Ta-rich dendritic crystals, Ta-Cr-rich dendritic crystals and a Zr elementary substance; ti-Ta-rich dendritic crystals and Ta-Cr-rich dendritic crystals are dispersed and distributed in a matrix, dislocation movement is hindered, and the alloy strengthening effect is achieved; the Zr elementary substance is segregated at the grain boundary, pinning the grain boundary, inhibiting grain growth and being used for strengthening the alloy; the grain size of particles in the TiAlCrZrTa high-entropy alloy ranges from 5 micrometers to 10 micrometers. The problems that an existing high-entropy alloy preparation technology is complex, crystal grains are coarse and large, and components are not uniform are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of high entropy alloys, and in particular to a TiAlCrZrTa high entropy alloy and a preparation method thereof. Background Art

[0002] High-entropy alloys (HEAs) are alloys composed of five or more main elements, and the molar fraction of each main element is between 5% and 35%. When there are other minor elements, the content of each minor element must be less than 5%. Due to its unique composition design and complex microstructure, high-entropy alloys show better performance than traditional alloys, such as high strength, high hardness, good wear resistance and corrosion resistance, and can find its superior application value in many fields.

[0003] In the study of high entropy alloys, the selection and ratio of elements are key. Most of the five elements Ti, Al, Cr, Zr, and Ta have body-centered cubic (BCC) or face-centered cubic (FCC) structures. Similar crystal structures help to form a uniform phase structure in the alloy, further improving the performance of the alloy. At the same time, their atomic radius and melting point are similar, which helps to reduce lattice distortion and stress concentration during the mixing process, form a uniform mixture during melting and solidification, improve the stability and strength of the alloy, and reduce component segregation. However, how to accurately control the ratio and distribution of these elements, and what preparation technology to use to obtain high-entropy alloys with excellent performance, are still the difficulties of current research.

[0004] Traditional high entropy alloy preparation technologies include vacuum arc melting and powder metallurgy. Among them, vacuum arc melting has problems such as component segregation, uneven structure, low density, and product size limitation. Powder metallurgy usually adopts mechanical alloying + hot pressing sintering technology, such as the patent document "A NbMoTaWCu high entropy alloy and its preparation method" (authorization announcement number: CN115011827B), the hot pressing sintering technology used in it has problems such as complex preparation process, long sintering time, and high cost.

[0005] In summary, the defects of existing high entropy alloy technology are complex preparation process, coarse grains and uneven composition. Summary of the invention

[0006] In order to overcome the defects of the above-mentioned prior art, the purpose of the present invention is to provide a TiAlCrZrTa high entropy alloy and a preparation method thereof, which combines mechanical alloying and spark plasma sintering technology to effectively solve the problems of complex preparation process, coarse grains and uneven composition of the existing high entropy alloy.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A TiAlCrZrTa high entropy alloy comprising a matrix phase and dispersed particles;

[0009] The matrix phase is TiAlCrZrTa, and the dispersed particles include Ti-Ta-rich dendrites, Ta-Cr-rich dendrites and Zr element;

[0010] Ti-Ta-rich dendrites and Ta-Cr-rich dendrites are dispersed in the matrix, hindering dislocation movement and strengthening the alloy.

[0011] Zr is concentrated at the grain boundary, pinning the grain boundary and inhibiting the growth of grains, which is used to strengthen the alloy.

[0012] The grain size of the internal particles of TiAlCrZrTa high entropy alloy is 5-10um.

[0013] A preparation method of a TiAlCrZrTa high entropy alloy comprises the following steps: placing TiAlCrZrTa high entropy alloy powder in a graphite mold, performing spark plasma sintering in a vacuum state, generating local high temperature when a pulse current passes through the gaps between powder particles, activating the material on the surface of the particles to form plasma; after the sintering is completed, the mold is cooled to room temperature with the furnace, and the TiAlCrZrTa high entropy alloy is obtained after the mold is removed.

[0014] The sintering process parameters are: sintering temperature 1000-1600° C., sintering time 20-60 min; heat preservation time 10-30 min, and sintering pressure 40-100 Mpa.

[0015] The vacuum degree of the vacuum state is 1×10 -3 ~1×10 -4 Pa. The purpose of this setting is to avoid oxidation of the material and remove impurity gases in the furnace to facilitate precise temperature control.

[0016] The preparation method of the TiAlCrZrTa high entropy alloy powder is:

[0017] S1: Weigh Ti powder, Al powder, Cr powder, Zr powder and Ta powder as raw materials, weigh them according to an equiatomic ratio and mix them evenly to obtain a TiAlCrZrTa high entropy alloy mixed powder;

[0018] S2: placing the TiAlCrZrTa high entropy alloy mixed powder, stainless steel ball milling beads and a dispersant in a stainless steel ball milling tank for ball milling to obtain a uniformly mixed TiAlCrZrTa high entropy alloy powder;

[0019] S3: placing the ball-milled TiAlCrZrTa high entropy alloy mixed powder in a vacuum drying oven, drying it under vacuum, and sieving the dried mixed powder.

[0020] In the step S1, Ti:Al:Cr:Zr:Ta=1:1:1:1:1 at.% are weighed and uniformly mixed.

[0021] In the step S1, the five metal powders of Ti, Al, Cr, Zr and Ta are respectively sieved through a 80-200 mesh sieve.

[0022] In the step S2, ball milling is performed in a planetary high-energy ball mill, and the ball milling process parameters are: ball milling time is 1 to 24 hours, the volume ratio of balls to materials is balls (1 to 10): materials (1), wherein the materials refer to TiAlCrZrTa high entropy alloy mixed powder, the ball milling speed is 100 to 400 rpm, and a dispersant is used to assist dispersion to avoid powder agglomeration, wherein the solid-liquid mass ratio of the TiAlCrZrTa high entropy alloy mixed powder to the dispersant is 1:1; and the dispersant is alcohol.

[0023] Furthermore, to prevent overcooling welding, the ball mill operation mode is: forward operation for 5 min, reverse operation for 5 min, and rest time for 1 min.

[0024] In step S3, the limiting condition of vacuum drying is a vacuum degree of 1×10 -2 ~1×10 -3 Pa, temperature 60-100℃; drying time 8-12h.

[0025] In the step S3, the dried mixed powder is sieved through a 80-200 mesh sieve.

[0026] Furthermore, the TiAlCrZrTa high entropy alloy is machined to obtain a TiAlCrZrTa high entropy alloy of desired shape and size.

[0027] The TiAlCrZrTa high entropy alloy is used to manufacture engine parts, aircraft structural parts, cutting tools, molds, and human implants.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The TiAlCrZrTa high entropy alloy of the present invention has small and relatively regular grains with an average grain size of about 5-10um. Since the grain boundaries of the small grains account for a large proportion, the movement of dislocations can be restricted. At the same time, the dendrite phase size is dispersed in the matrix, hindering the movement of dislocations and strengthening the alloy. Part of the Zr single substance is concentrated at the grain boundary, which can pin the grain boundary, inhibit the growth of grains, and further strengthen the alloy.

[0030] Step S1 of the present invention ensures that the atomic ratios of the elements are equal, laying the foundation for forming a high entropy alloy.

[0031] In step S2 of the present invention, the high entropy alloy mixed powder is further refined and evenly dispersed by ball milling, laying a foundation for subsequent molding and performance optimization.

[0032] In step S3 of the present invention, water and volatile impurities in the high entropy alloy powder are removed by vacuum drying to ensure the purity of the material.

[0033] In step S3 of the present invention, powders of suitable particle sizes are screened out through sieving to ensure uniform powder particle sizes, which is beneficial to uniform filling and sintering densification of powders in subsequent molding processes and improves product quality stability.

[0034] The spark plasma sintering technology of the present invention effectively avoids the problem of component segregation in the traditional smelting method, and obtains a high entropy alloy with uniform composition and an average grain size of about 5-10um.

[0035] The spark plasma sintering technology of the present invention has the characteristics of fast heating speed, short sintering time, high sintering pressure, etc., which is conducive to obtaining a high-entropy alloy with high density and low porosity, and its density is as high as more than 99.9%.

[0036] TiAlCrZrTa high entropy alloy combines the advantages of multiple elements and has a high hardness. The hardness can reach up to 908HV. 0.5 , exceeding the hardness of most cast high entropy alloys currently available. The high density is due to the efficient elimination of pores by plasma, which significantly improves the hardness of the sintered alloy.

[0037] The method provided by the invention has a simple process flow, is easy to industrialize and produce, and can optimize the performance of high entropy alloys by adjusting sintering parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a microstructure morphology diagram of the TiAlCrZrTa high entropy alloy mixed powder of Example 1 of the present invention.

[0039] Figure 2 This is an element distribution diagram of the TiAlCrZrTa high entropy alloy mixed powder of Example 1 of the present invention.

[0040] Figure 3 This is a block diagram of the TiAlCrZrTa high entropy alloy of Example 1 of the present invention.

[0041] Figure 4 This is a microstructure morphology diagram of the TiAlCrZrTa high entropy alloy block of Example 1 of the present invention.

[0042] Figure 5 This is an element distribution diagram of the TiAlCrZrTa high entropy alloy block of Example 1 of the present invention. DETAILED DESCRIPTION

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] Embodiment 1:

[0045] First, weigh 300 g of TiAlCrZrTa high entropy alloy powder raw material, including 36 g of Ti powder (particle size <10 μm, purity >99.9%), 20.28 g of Al powder (particle size <5 μm, purity >99.9%), 39.09 g of Cr powder (particle size <5 μm, purity >99.9%), 68.58 g of Zr powder (particle size <5 μm, purity >99.9%) and 136.05 g of Ta powder (particle size <3 μm, purity >99.9%).

[0046] 300 g of TiAlCrZrTa high entropy alloy mixed powder, alcohol and stainless steel ball milling beads were placed in a stainless steel ball milling jar with a ball-to-material volume ratio of 10:1 and a solid-liquid mass ratio of 1:1. The mixture was ball milled at 150 rpm for 12 h in a high-energy planetary ball mill.

[0047] The ball-milled TiAlCrZrTa high entropy alloy mixed powder was placed in a vacuum drying oven with a vacuum degree of 1×10 - 2 Pa, temperature 60 ° C, dried under vacuum for 8 hours and then taken out, the dried mixed powder was sieved through a 100-mesh sieve to finally obtain a uniformly mixed TiAlCrZrTa high entropy alloy powder.

[0048] The average grain size of the TiAlCrZrTa high entropy alloy powder prepared in Example 1 was measured using Smile View measurement software.

[0049] The microstructure morphology of the TiAlCrZrTa high entropy alloy mixed powder of Example 1 is as follows: Figure 1 As shown. It can be seen that the grain size is small, with an average grain size of 1.04um. Generally, the smaller the powder particle size, the larger the specific surface area and the faster the atomic diffusion rate, which is conducive to accelerating the densification process during sintering, thereby inhibiting grain growth and maintaining small and uniform grains. Therefore, the particle size of the powder should be controlled in the mechanical alloying stage to optimize the sintering effect.

[0050] The element distribution of the TiAlCrZrTa high entropy alloy mixed powder of Example 1 is as follows: Figure 2As shown. It can be seen that the distribution of the five elements Ti, Al, Cr, Zr, and Ta is relatively uniform, indicating that the five elements have been fully mixed during the mechanical alloying process. This is crucial to the performance of high entropy alloys, because uniform element distribution helps to form a stable solid solution structure, thus giving the alloy good mechanical properties.

[0051] The TiAlCrZrTa high entropy alloy mixed powder dried in Example 1 was placed in a graphite mold. In order to protect the mold and facilitate demoulding, graphite paper was used to separate the graphite mold and the powder. The outer side of the mold was wrapped with heat-insulating carbon felt to reduce the heat dissipation of the graphite mold and ensure that the mold maintained a constant temperature. The assembled graphite mold was placed in the furnace cavity and heated at 1×10 -3 Pa vacuum degree was used for sintering, and an infrared thermometer was used to measure the temperature during the sintering process. The sintering temperature was 1500℃, the sintering time was 35min, the holding time was 20min, and the sintering pressure was 60MPa. After sintering, the mold was cooled to room temperature with the furnace, and the TiAlCrZrTa high entropy alloy block was obtained after demolding.

[0052] Spark plasma sintering is carried out under vacuum conditions. When pulse current passes through the gaps between powder particles, local high temperatures are generated, so that the surface materials of the particles are activated to form plasma. At the same time, spark plasma sintering technology has the characteristics of rapid vacuum sintering. The Joule heat generated when the pulse current passes through the powder is concentrated on the contact part of the particles, so that the powder temperature rises rapidly, achieving rapid sintering and densification. Since the powder is directly filled into the graphite mold, the current passes through the graphite mold and applies axial pressure to make the powder particles in close contact. During the heating process, the particles undergo plastic deformation to achieve the purpose of filling the pores.

[0053] The relative density of the prepared TiAlCrZrTa high entropy alloy bulk was measured by the Archimedean drainage method.

[0054] The hardness of the prepared TiAlCrZrTa high entropy alloy block was measured by a Vickers hardness tester with a pressing load of 0.5 kgf and a holding time of 15 seconds.

[0055] The test results show that the average density of TiAlCrZrTa high entropy alloy is 7.48 g cm -3 , density up to 99.9%, Vickers hardness up to 908.4HV 0.5 , exceeding the Vickers hardness of most cast high entropy alloys currently available. The high density is due to the efficient elimination of pores by plasma, which significantly improves the hardness of the sintered alloy.

[0056] The TiAlCrZrTa high entropy alloy block of Example 1 is as follows Figure 3 As shown, it can be seen that the alloy has good bonding strength, there are no obvious scratches after engraving, and the alloy height is about 4.5mm.

[0057] The microstructure morphology of the TiAlCrZrTa high entropy alloy block of Example 1 is as follows: Figure 4 As shown in the figure, it can be seen that the alloy structure is composed of matrix phase (light gray area) and dispersed particles (white, dark gray and black areas), and there are obvious sintering defects such as holes in the structure. Among them, the light gray area is TiAlCrZrTa matrix phase, the white area is Ti-Ta-rich dendrites, the dark gray area is Ta-Cr-rich dendrites, and the black area is Zr single substance. Due to the fast heating speed and short holding time of the discharge plasma, the particles inside the alloy are evenly heated under the action of Joule heat, so Figure 4 Medium-small and relatively regular grains, with an average grain size of about 5-10um. Since the grain boundaries of fine grains account for a large proportion, dislocation movement can be restricted. At the same time, the dendrite phase size is dispersed in the matrix, hindering dislocation movement and strengthening the alloy. Some Zr single substances are concentrated at the grain boundaries, which can pin the grain boundaries, inhibit grain growth, and further strengthen the alloy.

[0058] Table 1 is a chemical composition table of the TiAlCrZrTa high entropy alloy block, which shows that the actual content of each element in the TiAlCrZrTa high entropy alloy is close to an equimolar ratio, which is conducive to stable and reliable alloy performance.

[0059] element Ti Al Cr Zr Ta Theoretical value of each element content, at% 20 20 20 20 20 Measured value of each element content, at% 19.5±1.3 19.3±1.8 20.4±0.6 19.8±0.5 21.0±1.1

[0060] The element distribution of the TiAlCrZrTa high entropy alloy block of Example 1 is as follows: Figure 5 As shown in the figure, it can be seen that the distribution of the five elements Ti, Al, Cr, Zr and Ta is relatively uniform, without obvious segregation. The uniformly distributed elements make the bonding force between atoms inside the alloy uniform, thereby effectively hindering dislocation movement and improving the hardness of the alloy.

[0061] Embodiment 2:

[0062] First, weigh 300 g of TiAlCrZrTa high entropy alloy powder raw material, including 36 g of Ti powder (particle size <10 μm, purity >99.9%), 20.28 g of Al powder (particle size <5 μm, purity >99.9%), 39.09 g of Cr powder (particle size <5 μm, purity >99.9%), 68.58 g of Zr powder (particle size <5 μm, purity >99.9%) and 136.05 g of Ta powder (particle size <3 μm, purity >99.9%).

[0063] 300 g of TiAlCrZrTa high entropy alloy mixed powder, alcohol and stainless steel ball milling beads were placed in a stainless steel ball milling jar with a ball-to-material volume ratio of 3:1 and a solid-liquid mass ratio of 1:1. The mixture was ball milled at 100 rpm for 6 h in a high-energy planetary ball mill.

[0064] The ball-milled TiAlCrZrTa high entropy alloy mixed powder was placed in a vacuum drying oven with a vacuum degree of 1×10 - 3 Pa, temperature 100 ° C, dry under vacuum for 12 hours and then take out, the dried mixed powder is sieved through a 200-mesh sieve to finally obtain a uniformly mixed TiAlCrZrTa high entropy alloy powder.

[0065] The TiAlCrZrTa high entropy alloy powder prepared in Example 2 was measured using Smile View measurement software, and the average grain size was 1.76 um.

[0066] The TiAlCrZrTa high entropy alloy mixed powder dried in Example 2 was placed in a graphite mold. In order to protect the mold and facilitate demolding, graphite paper was used to separate the graphite mold and the powder. The outer side of the mold was wrapped with heat-insulating carbon felt to reduce the heat dissipation of the graphite mold and ensure that the mold maintained a constant temperature. The assembled graphite mold was placed in the furnace cavity and heated at 1×10 -4 Pa vacuum degree was used for sintering, and an infrared thermometer was used to measure the temperature during the sintering process. The sintering temperature was 1000℃, the sintering time was 25min, the holding time was 15min, and the sintering pressure was 40MPa. After sintering, the mold was cooled to room temperature with the furnace, and the TiAlCrZrTa high entropy alloy block was obtained after demolding.

[0067] The relative density of the prepared TiAlCrZrTa high entropy alloy bulk was measured by the Archimedean drainage method.

[0068] The hardness of the prepared TiAlCrZrTa high entropy alloy block was measured by a Vickers hardness tester with a pressing load of 0.5 kgf and a holding time of 15 seconds.

[0069] The test results show that the average density of TiAlCrZrTa high entropy alloy is 6.88 g cm -3 , high density of 91.9%, Vickers hardness of 649.6HV 0.5 .

[0070] Embodiment 3:

[0071] First, weigh 100 g of TiAlCrZrTa high entropy alloy powder raw material, including 12 g of Ti powder (particle size <10 μm, purity >99.9%), 6.76 g of Al powder (particle size <5 μm, purity >99.9%), 13.03 g of Cr powder (particle size <5 μm, purity >99.9%), 22.86 g of Zr powder (particle size <5 μm, purity >99.9%) and 45.35 g of Ta powder (particle size <3 μm, purity >99.9%).

[0072] 100 g of TiAlCrZrTa high entropy alloy mixed powder, alcohol and stainless steel ball milling beads were placed in a stainless steel ball milling jar with a ball-to-material volume ratio of 1:1 and a solid-liquid mass ratio of 1:1. The mixture was ball milled at 300 rpm for 1 h in a high-energy planetary ball mill.

[0073] The ball-milled TiAlCrZrTa high entropy alloy mixed powder was placed in a vacuum drying oven with a vacuum degree of 1×10 - 3 Pa, temperature 80 ° C, dry under vacuum for 12 hours and then take out, the dried mixed powder is sieved through a 200-mesh sieve to finally obtain a uniformly mixed TiAlCrZrTa high entropy alloy powder.

[0074] The TiAlCrZrTa high entropy alloy powder prepared in Example 2 was measured using Smile View measurement software, and the average grain size was 3.68 um.

[0075] The TiAlCrZrTa high entropy alloy mixed powder dried in Example 3 was placed in a graphite mold. In order to protect the mold and facilitate demolding, graphite paper was used to separate the graphite mold and the powder. The outer side of the mold was wrapped with heat-insulating carbon felt to reduce the heat dissipation of the graphite mold and ensure that the mold maintained a constant temperature. The assembled graphite mold was placed in the furnace cavity and heated at 1×10 -4 Pa vacuum degree was used for sintering, and an infrared thermometer was used to measure the temperature during the sintering process. The sintering temperature was 1200℃, the sintering time was 22min, the holding time was 10min, and the sintering pressure was 45MPa. After sintering, the mold was cooled to room temperature with the furnace, and the TiAlCrZrTa high entropy alloy block was obtained after demolding.

[0076] The relative density of the prepared TiAlCrZrTa high entropy alloy bulk was measured by the Archimedean drainage method.

[0077] The hardness of the prepared TiAlCrZrTa high entropy alloy block was measured by a Vickers hardness tester with a pressing load of 0.5 kgf and a holding time of 15 seconds.

[0078] The test results show that the average density of TiAlCrZrTa high entropy alloy is 7.15 g cm -3 , high density of 95.5%, Vickers hardness of 827.9HV 0.5 .

[0079] The TiAlCrZrTa high entropy alloy has the advantages of uniform structure, fine grains, high hardness, etc. It is widely used in aerospace, automobile industry, machinery manufacturing, energy, surface engineering, biomedicine and other fields. It can be used to manufacture engine parts, aircraft structural parts, cutting tools, molds, human implants, etc.

[0080] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some modifications and improvements without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A TiAlCrZrTa high entropy alloy, characterized in that: Includes matrix phase and dispersed particles; The matrix phase is TiAlCrZrTa, and the dispersed particles include Ti-Ta-rich dendrites, Ta-Cr-rich dendrites and Zr element; Ti-Ta-rich dendrites and Ta-Cr-rich dendrites are dispersed in the matrix, hindering dislocation movement and strengthening the alloy. Zr is concentrated at the grain boundary, pinning the grain boundary and inhibiting the growth of grains, which is used to strengthen the alloy. The grain size of the internal particles of TiAlCrZrTa high entropy alloy is 5-10um.

2. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 1, characterized in that: TiAlCrZrTa high entropy alloy powder is placed in a graphite mold and spark plasma sintering is carried out under vacuum. When a pulse current passes through the gaps between powder particles, local high temperature is generated, so that the material on the surface of the particles is activated to form plasma. After sintering, the mold is cooled to room temperature with the furnace, and TiAlCrZrTa high entropy alloy is obtained after demolding.

3. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 2, characterized in that: The sintering process parameters are: sintering temperature 1000-1600°C, sintering time 20-60min; holding time 10-30min, sintering pressure 40-100MPa; The vacuum degree of the vacuum state is 1×10 -3 ~1×10 -4 Pa.

4. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 1 or 3, characterized in that: The preparation method of the TiAlCrZrTa high entropy alloy powder is: S1: Weigh Ti powder, Al powder, Cr powder, Zr powder and Ta powder as raw materials, weigh them according to an equiatomic ratio and mix them evenly to obtain a TiAlCrZrTa high entropy alloy mixed powder; S2: placing the TiAlCrZrTa high entropy alloy mixed powder, stainless steel ball milling beads and a dispersant in a stainless steel ball milling tank for ball milling to obtain a uniformly mixed TiAlCrZrTa high entropy alloy powder; S3: placing the ball-milled TiAlCrZrTa high entropy alloy mixed powder in a vacuum drying oven, drying it under vacuum, and sieving the dried mixed powder.

5. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 4, characterized in that: In the step S1, Ti:Al:Cr:Zr:Ta=1:1:1:1:1 at.% are weighed and uniformly mixed; the five metal powders of Ti, Al, Cr, Zr and Ta are respectively sieved through 80-200 mesh.

6. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 4, characterized in that: In the step S2, ball milling is performed in a planetary high-energy ball mill, and the ball milling process parameters are: ball milling time is 1 to 24 hours, the volume ratio of balls to materials is balls (1 to 10): materials (1), wherein the materials refer to TiAlCrZrTa high entropy alloy mixed powder, the ball milling speed is 100 to 400 rpm, and a dispersant is used to assist in dispersion, wherein the solid-liquid mass ratio of the TiAlCrZrTa high entropy alloy mixed powder to the dispersant is 1:1; and the dispersant is alcohol; The ball mill operation mode is: forward operation for 5 minutes, reverse operation for 5 minutes, and rest time for 1 minute.

7. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 4, characterized in that: In step S3, the limiting condition of vacuum drying is a vacuum degree of 1×10 -2 ~1×10 -3 Pa, temperature 60-100℃; drying time 8-12h.

8. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 4, characterized in that: In the step S3, the dried mixed powder is sieved through a 80-200 mesh sieve.

9. The method for preparing a TiAlCrZrTa high entropy alloy according to claim 2, characterized in that: The TiAlCrZrTa high entropy alloy is mechanically processed to obtain a TiAlCrZrTa high entropy alloy with a desired shape and size.

10. The TiAlCrZrTa high entropy alloy according to any one of claims 1 to 9, characterized in that: The TiAlCrZrTa high entropy alloy is used to manufacture engine parts, aircraft structural parts, cutting tools, molds, and human implants.

Images