CN114277301A - High-strength high-toughness light high-entropy alloy and preparation method thereof - Google Patents
High-strength high-toughness light high-entropy alloy and preparation method thereof Download PDFInfo
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Abstract
A high-strength high-toughness light high-entropy alloy comprises Ti, Al, Cr and Mn, wherein the content of each component in atomic percentage is as follows: 5-20% of Al; 5-20% of Cr; 5-20% of Mn; the balance being Ti. The preparation method comprises the following steps: weighing elemental Ti, Al, Cr and Mn wire materials according to atomic percentage; putting the weighed materials into a vacuum smelting furnace for smelting, preserving heat and cooling after Ti, Al, Cr and Mn are completely melted, and then turning over the obtained cast ingot for secondary smelting; and after the smelting is finished, casting to obtain an ingot casting sample. The high-entropy alloy disclosed by the invention has excellent room-temperature toughness of TC4, has excellent mechanical properties of TiAl alloy in a high-temperature environment, and reduces the manufacturing cost of the titanium alloy, so that the application range of the titanium alloy in the aerospace field is further expanded, and the high-entropy alloy has an important significance for lightening the weight of an aerospace vehicle and even improving the thrust-weight ratio.
Description
Technical Field
The invention belongs to the technical field of light high-strength high-toughness alloy structural materials, and particularly relates to a high-strength high-toughness light high-entropy alloy and a preparation method thereof.
Background
The thrust-weight ratio is an important performance index of an aerospace aircraft, the thrust-weight ratio is improved to become a main attack direction for developing aviation technology, and the light weight of materials is the most effective basic method in a plurality of methods for improving the thrust-weight ratio.
The titanium alloy is a light high-strength alloy, has excellent characteristics of high specific strength, low density, good heat resistance and the like, and is continuously increased in the use amount on aerospace vehicles. The American general company replaces F22 stainless steel with titanium alloy, so that the overall mass of the airplane is reduced by 16%, the titanium alloy content of the F119 engine is 39%, and the thrust-weight ratio of the engine is remarkably improved. Obviously, the further improvement of the use amount of the titanium alloy in the aerospace craft has important significance for improving the thrust-weight ratio of the craft.
Ti6Al4V (also known as TC4 or Ti64) is the first practical titanium alloy to be developed successfully, and is known as the most popular titanium alloy due to its high strength, low density and good heat resistance, and occupies half-wall Jiangshan in the field of aerospace. But due to the performance attribute of the structure, the structure is mainly suitable for structural parts in medium and low temperature environments, such as a cold end part fan, an air compressor and the like of an engine. Until the advent of TiAl alloys, titanium alloy applications were developed from cold end to hot end. Advanced intermetallic TiAl alloys are considered as a high temperature structural material that can be used in the aerospace field. Clemens, f.appel and the like begin to use TiAl alloys to manufacture gas turbine blades and engine parts applied under high temperature conditions at the end of the last century, achieving better effects and further widening the application range of titanium alloys. However, the TiAl-based alloy has low toughness at low temperature, and thus is easy to cause damage to components under complex alternating load with large temperature change span in aerospace. Because the problems of poor thermal conductivity, strong chemical activity, severe work hardening tendency and the like of the existing titanium alloy, the problems of long manufacturing period, high cost and contradiction between strength and toughness are obvious; in addition, due to the intrinsic properties of insufficient hardness and easy abrasion of titanium alloy, some large-sized key bearing members cannot be manufactured by replacing high-strength stainless steel. Therefore, the application range of the titanium alloy on the aerospace craft is limited, and the forward pace of improving the thrust-weight ratio development of the aero-engine is slowed or hindered.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-strength high-toughness light-weight high-entropy alloy and a preparation method thereof, wherein based on Ti, low-cost alloy elements Al, Mn and Cr are added into the alloy as other main elements, so that the alloy not only has excellent room-temperature toughness of TC4, but also has excellent mechanical properties of TiAl alloy in a high-temperature environment, and simultaneously reduces the manufacturing cost of the titanium alloy, thereby further expanding the application range of the titanium alloy in the aerospace field and having important significance for lightening the titanium alloy and even improving the thrust-weight ratio of aerospace vehicles.
In order to achieve the purpose, the invention adopts the technical scheme that:
a high-strength high-toughness light high-entropy alloy comprises Ti, Al, Cr and Mn, wherein the content of each component in atomic percentage is as follows:
5-20% of Al; 5-20% of Cr; 5-20% of Mn; the balance being Ti.
In one embodiment:
regulating the proportion of a B2 phase in the high-entropy alloy, the size of internal crystal grains of the high-entropy alloy and the yield strength of the high-entropy alloy by regulating and controlling the content of Mn;
adjusting the volume fraction of the beta phase by regulating the Cr content;
with different contents of Al, Cr and Mn, the high-entropy alloy has a body-centered cubic (BCC) or close-packed Hexagonal (HCP) crystal structure.
In one embodiment:
when the atomic ratio of Al, Cr and Mn elements is increased in equal proportion, the lattice constant of the beta phase in the high-entropy alloy is gradually reduced, the hardness is increased, and the compressive yield strength is gradually increased.
The invention also provides a preparation method of the high-strength high-toughness light high-entropy alloy, which comprises the following steps:
and 3, casting to obtain an ingot sample after the smelting is finished.
In one embodiment, in step 1, the material is ultrasonically cleaned by absolute ethyl alcohol before weighing, wherein the Mn wire is acid-washed by nital solution before cleaning.
In one embodiment, in the step 2, the vacuum melting furnace is provided with a 20 ° cooling device, and the cooling device adopts a water cooling mode.
In one embodiment, in step 2, before smelting, the furnace body of the vacuum smelting furnace is subjected to a gas washing operation: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa; standing for 10-20 min, and performing secondary vacuum-pumping and gas-washing operation.
In one embodiment, in step 2, the voltage of the vacuum melting is set to 300V, and the current is 25A.
In one embodiment, in the step 2, after Ti, Al, Cr and Mn are completely melted, the temperature is kept for 15s, and 4 times of melting are performed in the step 2.
In one embodiment, in the step 3, the casting is performed in a suction casting mode, and after the casting is completed, the ingot casting sample is cooled to room temperature in air.
Compared with the prior art, the invention takes Ti as the base, and adds low-cost alloy elements Al, Mn and Cr as other main elements, thereby not only effectively reducing the weight of the material, but also achieving the strength, toughness and high-temperature thermal stability of high-strength steel, and enabling the high-strength steel to replace the currently used titanium alloy.
The TiAlCrMn high-entropy alloy designed and prepared by the method has a single BCC or HCP structure, the compression strength performance of the TiAlCrMn high-entropy alloy is increased by 66.8 percent to the maximum, the toughness is improved by 71.4 percent, and the hardness increase rate is up to 128.6 percent compared with the existing TC4 alloy. The material design method is simple, the preparation process is economical and efficient, and the defects of air holes, looseness and the like generated by traditional casting or additive manufacturing are reduced on the basis of improving the strength and toughness of the alloy. The material has high forming efficiency and excellent performance, and has wide application prospect in the field of aerospace.
Drawings
FIG. 1 is an XRD spectrum of the TiAlCrMn high-entropy alloy material.
FIG. 2 is a schematic diagram of the microhardness of the TiAlCrMn high-entropy alloy material.
Fig. 3 is a graph showing the compression performance of example 1 of the present invention.
Fig. 4 is a graph showing the compression performance of embodiment 3 of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
The titanium alloy is a light high-strength alloy, and has excellent high specific strength, low density and good heat resistance, so that the use amount of the titanium alloy on aerospace aircrafts is continuously increased. However, the problems of poor thermal conductivity, strong chemical activity, severe work hardening tendency and the like of the titanium alloy lead to the problems of long manufacturing period, high cost and obvious contradiction between strength and toughness. In addition, due to the intrinsic properties of insufficient hardness and easy abrasion of the titanium alloy, the application range of the titanium alloy on an aerospace aircraft is limited, and the advancing pace of improving the thrust-weight ratio of an aeroengine is slowed or hindered.
The high-entropy alloy is endowed with a unique super solid solution microstructure due to multiple effects of high mixed entropy, retarded diffusion, lattice distortion, cocktail and the like. Compared with other conventional alloys, the high-entropy alloy has excellent properties such as high strength, high hardness, high work hardening, high wear resistance, high temperature stability, corrosion resistance and the like. Therefore, the material can be used as a potential functional material and engineering material. Especially the advantage of thermodynamic stability, provides a new idea for people to research and develop a high-entropy titanium alloy which not only has high strength and high toughness at room temperature, but also has high temperature performance.
The invention adds Al, Cr and Mn into titanium, namely, the high-strength high-toughness light high-entropy alloy is composed of Ti, Al, Cr and Mn elements, and the contents of the components are as follows by atomic percentage: 5-20% of Al; 5-20% of Cr; 5-20% of Mn; the balance being Ti.
On the one hand, by introducing Mn, the proportion of B2 phase in the high-entropy alloy, the internal grain size of the high-entropy alloy are improved, and the yield strength of the high-entropy alloy can also be improved due to the shrinkage of alloy crystal lattices caused by Mn atoms. These parameters can be adjusted by adjusting the Mn content. Meanwhile, Cr is also a stabilizer with stronger beta phase, the volume fraction of the beta phase can be promoted to increase by introducing Cr, and the parameter can be adjusted by regulating the content of Cr. On the other hand, with different contents of Al, Cr and Mn, the high-entropy alloy matrix presents different body-centered cubic (BCC) or close-packed Hexagonal (HCP) crystal structures, which is important for regulating and controlling the properties of the high-entropy alloy such as strength, hardness, elongation and the like.
When the atomic ratio of the Al, Cr and Mn elements is increased in equal proportion, the lattice constant of the beta phase in the high-entropy alloy is gradually reduced, and illustratively, the lattice constant can be gradually reduced from Ti70Al10Cr10Mn103.195 to Ti55Al15Cr15Mn153.12 of (1). Ti55Al15Cr15Mn15A small amount of HCP alpha phase is precipitated in the simple BCC solid solution phase in the material, and Ti40Al20Cr20Mn20The material phase is converted into an alpha phase with HCP structure, so that the hardness of the high-entropy alloy is continuously increased along with the increase of the contents of Al, Cr and Mn, and is changed from Ti55Al15Cr15Mn15To Ti40Al20Cr20Mn20The increase is 159.9 percent; while the compressive yield strength also gradually increases, illustratively, Ti55Al15Cr15Mn15Compressive yield strength ratio of Ti85Al5Cr5Mn5The compressive yield strength of (a) is increased by 82.1%; ti85Al5Cr5Mn5And Ti70Al10Cr10Mn10Has a compression deformation rate of more than 60%, and Ti55Al15Cr15Mn15The compression deformation of the material is also larger than 10%.
The invention also provides a preparation method of the high-strength high-toughness light high-entropy alloy, which comprises the following steps:
Before weighing, the material can be cleaned by using absolute ethyl alcohol with ultrasonic wave, and the cleaning time can be 2-5 minutes. Note that since Mn is easily oxidized, before cleaning, pickling should be performed with a 10% nital solution, and ultrasonic cleaning is performed for 2 minutes. The acid washing process is repeated once, and after the surface oxide layer is cleaned, ultrasonic cleaning is carried out in absolute ethyl alcohol. The materials are dried by using an air duct after being cleaned, and are weighed in a weighing balance, wherein the precision of the balance is +/-0.001 g.
And 2, putting the weighed materials into a vacuum smelting furnace for smelting, preserving heat and cooling after Ti, Al, Cr and Mn are completely molten, and then turning over the obtained cast ingot for secondary smelting.
Illustratively, the vacuum melting furnace is provided with a 20-degree cooling device, and the cooling device adopts a water cooling mode. Before smelting, the gas washing operation can be carried out on the furnace body of the vacuum smelting furnace: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa; standing for 10-20 min, and performing secondary vacuum-pumping and gas-washing operation, wherein the process is repeated for 2 times. After the gas washing is finished, vacuum melting is carried out, the voltage can be set to 300V, and the current can be set to 25A. And when the Ti, the Al, the Cr and the Mn are completely melted, keeping the temperature for 15s, and then cooling by adopting a water cooling mode. After cooling, the ingot sample was turned over and subjected to a second melting for a total of 4 times.
And 3, casting to obtain an ingot sample after the smelting is finished.
Illustratively, the casting may be performed in a suction casting mode with mold dimensions of 10mm x 70mm, and the ingot sample is air cooled to room temperature after the casting is completed.
The following are several embodiments of the invention.
Example 1:
preparation of Ti70Al10Cr10Mn10The high-entropy alloy comprises the following elements in percentage by atom: 10% of Al, 10% of Cr, 10% of Mn and the balance of Ti.
The first step is as follows: weighing a certain mass of elemental Ti, Al, Cr and Mn wire materials according to the atomic ratio, wherein the mass of Ti is 35.73g, the mass of Al is 2.88g, the mass of Cr is 5.54g and the mass of Mn is 5.86 g. The purity of the wire is 99.99%, and the diameter of the wire is about 2 mm. Before weighing, the material is ultrasonically cleaned by absolute ethyl alcohol for 5 minutes. Before cleaning, the Mn wire is pickled, and is cleaned for 2 minutes by ultrasonic waves by using a 10% nitric acid alcohol solvent. The acid washing process is repeated once, and after the surface oxide layer is cleaned, ultrasonic cleaning is carried out in an absolute ethyl alcohol solvent. The materials are dried by using an air duct after being cleaned, and the materials with specific mass are weighed in a weighing balance.
The second step is that: putting the materials into a vacuum smelting furnace for smelting. Before smelting, the furnace body is subjected to gas washing operation: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa. After standing for 10 minutes, a second vacuum-pumping and gas-washing operation was performed, and the process was repeated 2 times. After the completion of the gas washing, vacuum melting was carried out at a voltage of 300V and a current of 25A. And when the Ti, Al, Cr and Mn wires are completely melted, keeping the temperature for 15 s. And then cooling by water cooling. And after cooling, turning over the ingot sample, and carrying out secondary smelting. The material is prepared by 4 times of smelting.
The third step: and after 4 times of smelting is finished, casting in a suction casting mode, wherein the size of the mold is 10 multiplied by 70mm, and after the casting is finished, cooling the cast ingot sample in air to room temperature.
Ti prepared by the method70Al10Cr10Mn10The structure of the beta single-phase-BCC alloy with high entropy is shown in figure 1, and the hardness is 405.6HV, shown in figure 2. The compressive yield strength can reach 1260MPa, the elongation is more than 45 percent, and the relative quotientThe compressive yield strength and elongation with TC4 were increased by 29.9% and 28.6%, respectively, and the compressive properties are shown in fig. 3.
Example 2:
preparation of Ti70Al5Cr10Mn15The high-entropy alloy comprises the following elements in percentage by atom: 5% of Al, 10% of Cr, 15% of Mn and the balance of Ti.
The first step is as follows: weighing a certain mass of elemental Ti, Al, Cr and Mn wire materials according to the atomic ratio, wherein the mass of Ti is 34.69g, the mass of Al is 1.40g, the mass of Cr is 5.38g and the mass of Mn is 8.53 g. The purity of the wire is 99.99%, and the diameter of the wire is about 2 mm. Before weighing, the material is ultrasonically cleaned by absolute ethyl alcohol for 5 minutes. Before cleaning, the Mn wire is pickled, and is cleaned for 2 minutes by ultrasonic waves by using a 10% nitric acid alcohol solvent. The acid washing process is repeated once, and after the surface oxide layer is cleaned, ultrasonic cleaning is carried out in an absolute ethyl alcohol solvent. The materials are dried by using an air duct after being cleaned, and the materials with specific mass are weighed in a weighing balance.
The second step is that: putting the materials into a vacuum smelting furnace for smelting. Before smelting, the furnace body is subjected to gas washing operation: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa. After standing for 10 minutes, a second vacuum-pumping and gas-washing operation was performed, and the process was repeated 2 times. After the completion of the gas washing, vacuum melting was carried out at a voltage of 300V and a current of 25A. And when the Ti, Al, Cr and Mn wires are completely melted, keeping the temperature for 15 s. And then cooling by water cooling. And after cooling, turning over the ingot sample, and carrying out secondary smelting. The material is prepared by 4 times of smelting.
The third step: and after 4 times of smelting is finished, casting in a suction casting mode, wherein the size of the mold is 10 multiplied by 70mm, and after the casting is finished, cooling the cast ingot sample in air to room temperature.
Ti prepared by the method70Al5Cr10Mn15The high-entropy alloy is in a beta single-phase-BCC structure. The compression curve is similar to that of fig. 3, and is greatly improved compared with the commercial TC 4.
Example 3:
preparation of Ti55Al15Cr15Mn15The high-entropy alloy comprises the following elements in percentage by atom: 15% of Al, 15% of Cr, 15% of Mn and the balance of Ti.
The first step is as follows: weighing a certain mass of elemental Ti, Al, Cr and Mn wire materials according to the atomic ratio, wherein the mass of Ti is 28.37g, the mass of Al is 4.36g, the mass of Cr is 8.4g and the mass of Mn is 8.88 g. The purity of the wire is 99.99%, and the diameter of the wire is about 2 mm. Before weighing, the material was ultrasonically cleaned with absolute ethanol for 3 minutes. Before cleaning, the Mn material is pickled, a 10% nitric acid alcohol solvent is selected, ultrasonic cleaning is carried out for 2 minutes, and the steps are repeated. And after the surface oxide layer is cleaned, carrying out ultrasonic cleaning in an absolute ethyl alcohol solvent. The materials are dried by using an air duct after being cleaned, and are weighed in a weighing balance, wherein the precision of the balance is +/-0.001 g.
The second step is that: the material is put into a vacuum melting furnace for melting, and the vacuum furnace is provided with a 20-degree cooling device. Before smelting, the furnace body is subjected to gas washing operation: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa. After standing for 20 minutes, a second vacuum-pumping and gas-washing operation was performed, and the process was repeated 2 times. After the completion of the gas washing, vacuum melting was carried out at a voltage of 300V and a current of 25A. And when the Ti, Al, Cr and Mn wires are completely melted, keeping the temperature for 15 s. And then cooling by water cooling. And after cooling, turning over the ingot sample, and carrying out secondary smelting. The material is prepared by 4 times of smelting.
The third step: and after 4 times of smelting is finished, casting in a suction casting mode, wherein the size of the mold is 10mm multiplied by 70mm, and after the casting is finished, cooling the cast ingot sample in air to room temperature.
Ti prepared by the method55Al15Cr15Mn15The structure of the beta single-phase-BCC alloy with high entropy is shown in figure 1. Compared with the traditional TC4 material, the strength is 1618MPa, the elongation is 12%, the hardness is 559HV, the compressive yield strength is improved by 66.8%, the hardness is improved by 60.2%, and the hardness and the compression performance are shown in figures 2 and 4.
Example 4:
preparation of Ti40Al120Cr20Mn20The high-entropy alloy comprises the following elements in percentage by atom: 20% of Al, 20% of Cr, 20% of Mn and the balance of Ti.
The first step is as follows: weighing a certain mass of elemental Ti, Al, Cr and Mn wire materials according to the atomic ratio, wherein the mass of Ti is 20.85g, the mass of Al is 5.88g, the mass of Cr is 11.32g and the mass of Mn is 11.96 g. The purity of the wire is 99.99%, and the diameter of the wire is about 2 mm. Before weighing, the material is cleaned by absolute ethyl alcohol with ultrasonic wave for 2-5 minutes. Note that since Mn is easily oxidized, before cleaning, pickling should be performed, and cleaning with 10% nital alcohol for 2 minutes by ultrasonic waves is selected. The acid washing process is repeated once, and after the surface oxide layer is cleaned, ultrasonic cleaning is carried out in an absolute ethyl alcohol solvent. The materials are dried by using an air duct after being cleaned, and are weighed in a weighing balance, wherein the precision of the balance is +/-0.001 g.
The second step is that: the material is put into a vacuum melting furnace for melting, and the vacuum furnace is provided with a 20-degree cooling device. Before smelting, the furnace body is subjected to gas washing operation: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa. After standing for 10-20 min, performing a second vacuum-pumping and gas-washing operation, and repeating the process for 2 times. After the completion of the gas washing, vacuum melting was carried out at a voltage of 300V and a current of 25A. And when the Ti, Al, Cr and Mn wires are completely melted, keeping the temperature for 15 s. And then cooling by water cooling. And after cooling, turning over the ingot sample, and carrying out secondary smelting. The material is prepared by 4 times of smelting.
The third step: and after 4 times of smelting is finished, casting in a suction casting mode, wherein the size of the mold is 10mm multiplied by 70mm, and after the casting is finished, cooling the cast ingot sample in air to room temperature.
Ti prepared by the method40Al20Cr20Mn20The structure of the high-entropy alloy is shown in a double-phase HCP structure in figure 1. Compared with the traditional TC4 material, the hardness of the material is as high as 798HV, and the microhardness is shown in figure 2.
Claims (10)
1. The high-strength high-toughness light high-entropy alloy is characterized by consisting of Ti, Al, Cr and Mn, wherein the content of each component in atomic percentage is as follows:
5-20% of Al; 5-20% of Cr; 5-20% of Mn; the balance being Ti.
2. The high strength high toughness lightweight high entropy alloy of claim 1, wherein:
regulating the proportion of a B2 phase in the high-entropy alloy, the size of internal crystal grains of the high-entropy alloy and the yield strength of the high-entropy alloy by regulating and controlling the content of Mn;
adjusting the volume fraction of the beta phase by regulating the Cr content;
with different contents of Al, Cr and Mn, the high-entropy alloy has a body-centered cubic (BCC) or close-packed Hexagonal (HCP) crystal structure.
3. The high strength high toughness lightweight high entropy alloy of claim 1 or 2, wherein:
when the atomic ratio of Al, Cr and Mn elements is increased in equal proportion, the lattice constant of the beta phase in the high-entropy alloy is gradually reduced, the hardness is increased, and the compressive yield strength is gradually increased.
4. The preparation method of the high-strength high-toughness light-weight high-entropy alloy as claimed in claim 1, characterized by comprising the following steps:
step 1, weighing elemental Ti, Al, Cr and Mn wire materials according to atomic percentage;
step 2, putting the weighed materials into a vacuum smelting furnace for smelting, preserving heat and cooling after Ti, Al, Cr and Mn are completely molten, and then turning over the obtained cast ingot for secondary smelting;
and 3, casting to obtain an ingot sample after the smelting is finished.
5. The preparation method of the high-strength high-toughness light-weight high-entropy alloy as claimed in claim 4, wherein in the step 1, the material is ultrasonically cleaned by absolute ethyl alcohol before weighing, and the Mn wire is acid-washed by a nital solution before cleaning.
6. The preparation method of the high-strength high-toughness light-weight high-entropy alloy according to claim 4, wherein in the step 2, a vacuum smelting furnace is provided with a 20-degree cooling device, and the cooling device adopts a water cooling mode.
7. The preparation method of the high-strength high-toughness light-weight high-entropy alloy according to claim 4, wherein in the step 2, a gas washing operation is performed on a vacuum smelting furnace body before smelting: firstly, the furnace is vacuumized to a vacuum degree<9.9×10-4Then argon with the purity of 99.9 percent is filled, and the filling is stopped when the pressure in the furnace reaches-0.5 MPa; standing for 10-20 min, and performing secondary vacuum-pumping and gas-washing operation.
8. The method for preparing the high-strength high-toughness light-weight high-entropy alloy as claimed in claim 4, wherein in the step 2, the voltage for vacuum melting is set to 300V, and the current is 25A.
9. The method for preparing the high-strength high-toughness light-weight high-entropy alloy as claimed in claim 4, wherein in the step 2, after Ti, Al, Cr and Mn are completely melted, the temperature is kept for 15s, and the step 2 is performed for 4 times in total.
10. The preparation method of the high-strength high-toughness light-weight high-entropy alloy according to claim 4, wherein in the step 3, the alloy is cast in a suction casting mode, and an ingot sample is cooled to room temperature in air after the casting is completed.
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