CN116287818B - AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity and preparation method thereof - Google Patents
AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity and preparation method thereof Download PDFInfo
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- 239000000956 alloy Substances 0.000 title claims abstract description 179
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- 239000002184 metal Substances 0.000 claims abstract description 29
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- 238000013461 design Methods 0.000 claims abstract description 6
- 238000005498 polishing Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
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- 239000000126 substance Substances 0.000 description 2
- 229910017150 AlTi Inorganic materials 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
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- 238000001938 differential scanning calorimetry curve Methods 0.000 description 1
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention discloses a preparation method of AlCoCrFeNiTi series high-entropy alloy with high strength and plasticity, which comprises the following steps: 1. preparing metal and intermediate alloy raw materials according to the design components of the target product; 2. preparing a high-entropy alloy cast ingot by adopting a vacuum arc furnace smelting method; 3. and (3) carrying out solution treatment at 1250-1300 ℃ for 10h, and then carrying out aging treatment at 800-850 ℃ for 6h to obtain AlCoCrFeNiTi-series high-entropy alloy. According to the invention, through designing the high-entropy alloy components and controlling the smelting and heat treatment process parameters, the distribution of each alloy element in the high-entropy alloy cast ingot is promoted to be uniform, dendrite segregation in AlCoCrFeNiTi series high-entropy alloy is eliminated, as-cast alloy grains are thinned, and further the defects of uneven pores and the like generated in the gamma' phase precipitation process are avoided, so that AlCoCrFeNiTi series high-entropy alloy with high strength and high plasticity at room temperature is obtained.
Description
Technical Field
The invention belongs to the technical field of high-entropy alloy, and particularly relates to AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity and a preparation method thereof.
Background
The application environment of modern new materials is often faced with a plurality of complex working conditions, and it is often desirable to obtain materials which can be stably used in a plurality of working environments. In the field of alloy materials, high-entropy alloys with cocktail intrinsic properties are hosted by a broader application potential than traditional single-unit alloy materials do. The high-entropy alloy has higher application value in the fields of high-temperature aviation materials, marine corrosion-resistant materials, film materials, magnetic metal materials, superconducting materials, ultralow-temperature engineering mechanical materials and the like. Currently, the heat of research on high-entropy alloys is continuously increasing.
AlCoCrFeNiTi-series high-entropy alloy can simultaneously have the characteristics of high temperature resistance, oxidation resistance, corrosion resistance, magnetism, high strength and the like. For example, a Ni 45(FeCoCr)40(AlTi)15 alloy under this alloy system can achieve a tensile yield strength exceeding 400MPa at 800 ℃ under high temperature conditions; the equal atomic ratio AlCoCrFeNi high-entropy alloy which is close to the components of the system has the characteristics of high hardness, high wear resistance, corrosion resistance and the like; in addition, the Al 9Co15Cr9.2Ni59Ti7.8 alloy has the characteristics of high strength and the like at high temperature and room temperature. Currently, alCoCrFeNiTi series alloys face an important challenge, namely, for the mechanical properties of the series alloys, the content of Fe element in the alloys needs to be reduced in order to further improve the strength, wear resistance and high-temperature stability of the alloys. However, for such high entropy alloys, the reduction of the Fe element content can seriously affect the plasticity of the alloy. How to make AlCoCrFeNiTi series high-entropy alloy with lower Fe element content have higher plasticity is a problem to be solved in the research work of the high-entropy alloy material.
Currently, the preparation of AlCoCrFeNiTi-series high-entropy alloys also faces numerous challenges. For example, in the smelting process of the series of high-entropy alloy, the melting point of Al element is low, the melting points of Ni and Co elements are high, the melting point difference of each metal element is generally larger, and the problems of uneven components, high element segregation degree, coarse dendrites, shrinkage cavity in the ingot and the like are often faced by the smelted alloy ingot due to the slow diffusion effect in the preparation process of the high-entropy alloy, so that the service performance of the alloy is seriously affected. In addition, the alloy can generate a plurality of uneven pores caused by the disappearance of gamma phase in the subsequent homogenizing annealing treatment process, and the uneven pores can form defects in the solidification process and become crack sources of the cast ingot alloy.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a preparation method of AlCoCrFeNiTi series high-entropy alloy with high strength and plasticity aiming at the defects of the prior art. The method greatly weakens the adverse factors such as element segregation, dendrite, and alloy sensitivity to cracks existing in the as-cast AlCoCrFeNiTi high-entropy alloy by adopting a vacuum arc furnace smelting method and controlling the heat treatment process and parameters. Finally, the AlCoCrFeNiTi series high-entropy alloy with high strength and high plasticity at room temperature is obtained, and the problems that the low-Fe (including no Fe) high-Ni content AlCoCrFeNiTi series high-entropy alloy has low plasticity, uneven components and coarse dendrite which affect the quality of the alloy are solved.
In order to solve the technical problems, the invention adopts the following technical scheme: a preparation method of AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity is characterized by comprising the following steps:
Step one, preparing a metal and intermediate alloy raw material according to design components of a target product AlCoCrFeNiTi high-entropy alloy; the target product AlCoCrFeNiTi is the designed component of the high-entropy alloy, and the atomic percentages of the elements are as follows: 8% -9% of Al, 14% -15% of Co, 8.2% -9.2% of Cr, 0% -5% of Fe, 58% -59% of Ni and 6.8% -7.8% of Ti, wherein the atomic percentage deviation of each element in the raw materials of the metal and the intermediate alloy is less than +/-0.1%, and the entropy value of the target product AlCoCrFeNiTi is high-entropy alloy and is not lower than 1.32R; the mass purity of the metal and intermediate alloy raw materials is more than 99.9 percent;
step two, preparing AlCoCrFeNiTi series high-entropy alloy cast ingots from the metal and intermediate alloy raw materials prepared in the step one by adopting a vacuum arc furnace smelting method; the smelting current of the vacuum arc furnace smelting method is 300A-400A, the vacuum degree is less than 1X 10 -3 MPa, and a repeated smelting mode is adopted;
Thirdly, carrying out solution treatment on the AlCoCrFeNiTi series high-entropy alloy cast ingot prepared in the second step at 1250-1300 ℃ for 10 hours, and then carrying out aging treatment on the cast ingot at 800-850 ℃ for 6 hours to obtain AlCoCrFeNiTi series high-entropy alloy; the yield strength of AlCoCrFeNiTi high-entropy alloy exceeds 550MPa, the tensile strength exceeds 700MPa, and the elongation is not lower than 35%.
In the smelting process of the vacuum arc furnace in the second step, metal and intermediate alloy raw materials are melted and then cooled to form an ingot, then the ingot is turned over and is continuously smelted, and the smelting process is generally repeated for 5 times to ensure the distribution uniformity of each element in the AlCoCrFeNiTi-series high-entropy alloy ingot.
In the research process of the invention, alCoCrFeNiTi series high-entropy alloy is extremely sensitive to temperature in the heat treatment process, the alloy is exposed to the risk of melting when the temperature is higher than 1300 ℃, and the effect of better eliminating dendrite segregation in the alloy and optimizing the uniformity of each element can not be achieved when the temperature is lower than 1250 ℃. In this regard, the present invention is to seal a AlCoCrFeNiTi-series high-entropy alloy ingot under vacuum, heat-insulate it at 1250 deg.C, 1290 deg.C and 1300 deg.C for 10h, heat-insulate it at 850 deg.C for 6h, and perform differential thermal analysis, and the result is shown in FIG. 1. The differential thermal analysis DSC curve in fig. 1 shows that the heat absorption peak of AlCoCrFeNiTi high-entropy alloy is about 1320 ℃, and if the temperature is higher than the heat absorption peak, the high-entropy alloy is gradually melted, the grain boundary of the high-entropy alloy is seriously damaged at high temperature, and finally the performance of the high-entropy alloy is influenced, so that the temperature of solution treatment is lower than the melting temperature of the alloy. On the other hand, in the heat treatment process of the AlCoCrFeNiTi-series high-entropy alloy, the improvement of the solid solution temperature is beneficial to eliminating dendrites generated in the smelting process of the high-entropy alloy, and is beneficial to separating out a gamma' strengthening phase with finer morphology in the subsequent aging stage of the high-entropy alloy, so that the alloy performance is improved. In summary, the invention selects 1250 ℃ to 1300 ℃ as the solution treatment temperature range of the alloy.
The preparation method of the AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity is characterized in that the metal and intermediate alloy raw materials in the first step are as follows in percentage by mass: 8.5% -9.8% of intermediate alloy AlCr 609.9%~11.2%,TiNi30%, 3.1% -3.5% of intermediate alloy NiCr 60, 58.3% -59.2% of Ni, 15.1% -16.3% of Co and 0% -5.1% of Fe; and the weighing errors of the metal and intermediate alloy raw materials are less than +/-0.1 percent. The invention balances the melting points of the metal simple substances and the intermediate alloy by limiting the types and the mass percentages of the raw materials of the metal and the intermediate alloy so as to ensure that the raw materials are fully melted and uniformly mixed, and avoid the serious consequence that the alloy components cannot be uniformly distributed during smelting.
The preparation method of the AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity is characterized in that a copper mold is adopted to cool AlCoCrFeNiTi-series high-entropy alloy melt in the preparation process of the vacuum arc furnace smelting method in the second step, and the cooling rate is not lower than 20 ℃/s. The invention is beneficial to the fixation of the precipitated phase in AlCoCrFeNiTi series high-entropy alloy by limiting the cooling rate to carry out rapid cooling.
The preparation method of the AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity is characterized in that the AlCoCrFeNiTi-series high-entropy alloy in the third step is subjected to mechanical finish polishing treatment at a metallographic level after being cut, a tensile sample with the length, width and thickness of 4mm multiplied by 1mm multiplied by 0.5mm is obtained, and then the tensile sample is placed on a universal tensile testing machine, and tensile mechanical property test is carried out under the condition of a tensile rate of not higher than 1X 10 -3s-1.
The preparation method of the AlCoCrFeNiTi-series high-entropy alloy with high plasticity is characterized in that the mechanical fine polishing treatment process of the metallographic grade is as follows: polishing under No. 600, no. 800, no. 1000 and No. 1500 abrasive paper in sequence, and then dipping the polished silk cloth in CrO 3 polishing solution containing Al 2O3 polishing powder for fine polishing until the surface roughness of the tensile sample is reduced to below 0.3 mu m.
The preparation method of the AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity is characterized in that the tensile sample is a lath tensile sample.
In addition, the invention also discloses AlCoCrFeNiTi series high-entropy alloy with high plasticity prepared by the method.
Compared with the prior art, the invention has the following advantages:
1. The invention discloses a process method for component design, preparation processing and subsequent heat treatment of AlCoCrFeNiTi series high-entropy alloy, which comprises the steps of controlling the process parameters of a vacuum arc melting method and adopting repeated melting to promote uniform distribution of alloy elements in AlCoCrFeNiTi series high-entropy alloy cast ingots, controlling the heat treatment temperature and time comprising solution treatment and aging treatment in a combined way, effectively eliminating dendrite segregation in AlCoCrFeNiTi series high-entropy alloy, refining cast alloy grains, further avoiding the defects of uneven pores and the like generated in the gamma' -phase precipitation process, and obtaining AlCoCrFeNiTi series high-entropy alloy with high strength and high plasticity at room temperature.
2. Aiming at the difficult problems that the high-entropy alloy of AlCoCrFeNiTi series with low Fe and high Ni content has poor plasticity and the low-Fe alloy can generate coarse dendrites in the preparation smelting process and defects easily appear at the grain boundary to influence the use of the alloy, the invention effectively refines grains and avoids defects by controlling the smelting process and the solid solution and aging heat treatment process, and realizes the high plasticity characteristic of the AlCoCrFeNiTi series high-entropy alloy with low Fe (including no Fe) and high Ni content.
3. The invention further adjusts and reduces the segregation of elements in the as-cast AlCoCrFeNiTi series high-entropy alloy by controlling the heat treatment process and parameters, homogenizes the components of the as-cast alloy, greatly weakens the adverse factors such as element segregation, dendrite and alloy sensitivity to cracks and the like existing in the as-cast AlCoCrFeNiTi series high-entropy alloy, and remarkably improves the strength and plastic mechanical properties of the AlCoCrFeNiTi series high-entropy alloy.
4. The failure of AlCoCrFeNiTi series high-entropy alloy is generally caused by the sensitivity of the alloy to cracks in the stretching process due to the uneven distribution of each element in the alloy, the coarse grains of the as-cast alloy and the tiny defects generated by uneven precipitation of gamma' phase, and the preparation method fundamentally and furthest weakens the factors causing the failure of AlCoCrFeNiTi series high-entropy alloy, so that the strength and the plasticity of the series alloy are greatly improved compared with those of the high-entropy alloy obtained by the conventional method.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a DSC graph of the differential thermal analysis of AlCoCrFeNiTi-series high-entropy alloy ingots of the present invention.
FIG. 2a is a graph of the morphology of the low-order structure of AlCoCrFeNiTi-series high-entropy alloy prepared in example 1 of the present invention.
FIG. 2b is a graph of the microstructure morphology of AlCoCrFeNiTi-series high-entropy alloy prepared in example 1 of the present invention.
FIG. 3 is a graph showing the tensile stress strain of AlCoCrFeNiTi-series high-entropy alloy prepared in example 1 of the present invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
Step one, preparing a metal and intermediate alloy raw material according to design components of a target product AlCoCrFeNiTi high-entropy alloy; the target product AlCoCrFeNiTi is the designed component of the high-entropy alloy, and the atomic percentages of the elements are as follows: al 9%, co 15%, cr 9.2%, fe 0%, ni 59%, ti 7.8%, and the atomic percentage deviation of each element in the raw materials of the metal and intermediate alloy is less than +/-0.1%, and the entropy value of the target product AlCoCrFeNiTi is 1.32R; the mass purity of the metal and intermediate alloy raw materials is more than 99.9 percent;
The metal and intermediate alloy raw materials comprise the following components in percentage by mass: intermediate alloy AlCr 6011.2%,TiNi30 9.8.9%, intermediate alloy NiCr 60 3.5.5%, ni 59.2%, co 16.3% and Fe 0%; and the weighing errors of the metal and intermediate alloy raw materials are less than +/-0.1 percent;
Step two, preparing AlCoCrFeNiTi series high-entropy alloy cast ingots from the metal and intermediate alloy raw materials prepared in the step one by adopting a vacuum arc furnace smelting method; the smelting current of the vacuum arc furnace smelting method is 300A, the vacuum degree is 1X 10 -4 MPa, and a 5-time smelting mode is adopted; in the preparation process of the vacuum arc furnace smelting method, a copper mold is adopted to cool AlCoCrFeNiTi series high-entropy alloy melt, and the cooling rate is not lower than 20 ℃/s;
And thirdly, carrying out solution treatment on the AlCoCrFeNiTi series high-entropy alloy cast ingot prepared in the second step at 1250 ℃ for 10 hours, and then carrying out aging treatment on the cast ingot at 800 ℃ for 6 hours to obtain the AlCoCrFeNiTi series high-entropy alloy.
The AlCoCrFeNiTi series high-entropy alloy wire prepared in the embodiment is cut and then subjected to mechanical fine polishing treatment of metallographic grade, and the specific process is as follows: grinding under 600#, 800#, 1000#, 1500# abrasive paper in sequence, dipping CrO 3 polishing solution containing Al 2O3 polishing powder with polishing silk cloth, performing finish polishing until the surface roughness of a tensile sample is reduced below 0.3 mu m, obtaining a lath-shaped tensile sample with the length x width x thickness of 4mm x 1mm x 0.5mm of a gauge length section, placing the tensile sample on a universal tensile testing machine, testing tensile mechanical properties under the condition of a tensile rate of not higher than 1 x 10 -3s-1, and drawing a tensile stress strain curve chart shown in figure 3, wherein the yield strength of the AlCoCrFeNiTi high-entropy alloy is 580MPa, the tensile strength is 740MPa, and the elongation is 35%.
Fig. 2a is a graph of a microstructure of AlCoCrFeNiTi-series high-entropy alloy prepared in this example, and as can be seen from fig. 2a, the grain boundary of the AlCoCrFeNiTi-series high-entropy alloy is clean and clear, which indicates that the heat treatment temperature does not damage the grain boundary of the high-entropy alloy, dendrites are not found in the heat treated high-entropy alloy, and the components in the high-entropy alloy are uniformly distributed.
Fig. 2b is a high-power structure morphology diagram of AlCoCrFeNiTi series high-entropy alloy prepared in this embodiment, and it can be observed from fig. 2b that deep and fine pits are uniformly distributed in the AlCoCrFeNiTi series high-entropy alloy, which indicates that the precipitation of gamma' -phase is uniform and fine, and is beneficial to improving the strong plasticity of the high-entropy alloy.
Example 2
The present embodiment differs from embodiment 1 in that: the temperature of the solution treatment in the third step is 1290 ℃.
As a result of detection, the AlCoCrFeNiTi-series high-entropy alloy of this example has a yield strength of 590MPa, a tensile strength of 750MPa, and an elongation of 37.5%.
Example 3
The present embodiment differs from embodiment 1 in that: the temperature of the solution treatment in the third step is 1300 ℃, and the temperature of the aging treatment is 850 ℃.
As a result of detection, the AlCoCrFeNiTi-series high-entropy alloy of this example has a yield strength of 600MPa, a tensile strength of 800MPa, and an elongation of 38%.
Example 4
The embodiment comprises the following steps:
Step one, preparing a metal and intermediate alloy raw material according to design components of a target product AlCoCrFeNiTi high-entropy alloy; the target product AlCoCrFeNiTi is the designed component of the high-entropy alloy, and the atomic percentages of the elements are as follows: al 8%, co 14%, cr 8.2%, fe 5%, ni 58%, ti 6.8%, and the atomic percentage deviation of each element in the raw materials of the metal and intermediate alloy is less than +/-0.1%, and the entropy value of the target product AlCoCrFeNiTi is 1.4R; the mass purity of the metal and intermediate alloy raw materials is more than 99.9 percent;
The metal and intermediate alloy raw materials comprise the following components in percentage by mass: intermediate alloy AlCr 609.9%,TiNi30 8.5.5%, intermediate alloy NiCr 60 3.1.1%, ni 58.3%, co 15.1% and Fe 5%; and the weighing errors of the metal and intermediate alloy raw materials are less than +/-0.1 percent;
step two, preparing AlCoCrFeNiTi series high-entropy alloy cast ingots from the metal and intermediate alloy raw materials prepared in the step one by adopting a vacuum arc furnace smelting method; the smelting current of the vacuum arc furnace smelting method is 400A, the vacuum degree is 1X 10 -4 MPa, and a 5-time smelting mode is adopted; in the preparation process of the vacuum arc furnace smelting method, a copper mold is adopted to cool AlCoCrFeNiTi series high-entropy alloy melt, and the cooling rate is not lower than 20 ℃/s;
And thirdly, carrying out solution treatment on the AlCoCrFeNiTi series high-entropy alloy cast ingot prepared in the second step at 1250 ℃ for 10 hours, and then carrying out aging treatment on the cast ingot at 800 ℃ for 6 hours to obtain the AlCoCrFeNiTi series high-entropy alloy.
The AlCoCrFeNiTi series high-entropy alloy wire prepared in the embodiment is cut and then subjected to mechanical fine polishing treatment of metallographic grade, and the specific process is as follows: sequentially polishing under 600#, 800#, 1000#, 1500# sand paper, dipping CrO 3 polishing solution containing Al 2O3 polishing powder with polishing silk cloth for finish polishing until the surface roughness of a tensile sample is reduced below 0.3 mu m to obtain a lath-shaped tensile sample with the length x width x thickness of 4mm x 1mm x 0.5mm of the gauge length section, placing the tensile sample on a universal tensile testing machine, and testing tensile mechanical properties under the condition of a tensile rate of not higher than 1x 10 -3s-1, wherein the test result shows that: alCoCrFeNiTi is high-entropy alloy, the yield strength is 555MPa, the tensile strength is 710MPa, and the elongation is 39%.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any simple modification, variation and equivalent variation of the above embodiments according to the technical substance of the invention still fall within the scope of the technical solution of the invention.
Claims (6)
1. A preparation method of AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity is characterized by comprising the following steps:
Step one, preparing a metal and intermediate alloy raw material according to design components of a target product AlCoCrFeNiTi high-entropy alloy; the target product AlCoCrFeNiTi is the designed component of the high-entropy alloy, and the atomic percentages of the elements are as follows: 8% -9% of Al, 14% -15% of Co, 8.2% -9.2% of Cr, 0% -5% of Fe, 58% -59% of Ni and 6.8% -7.8% of Ti, wherein the atomic percentage deviation of each element in the raw materials of the metal and the intermediate alloy is less than +/-0.1%, and the entropy value of the target product AlCoCrFeNiTi is high-entropy alloy and is not lower than 1.32R; the mass purity of the metal and intermediate alloy raw materials is more than 99.9 percent; the metal and intermediate alloy raw materials comprise the following components in percentage by mass: 8.5% -9.8% of intermediate alloy AlCr 60 9.9%~11.2%,TiNi30%, 3.1% -3.5% of intermediate alloy NiCr 60, 58.3% -59.2% of Ni, 15.1% -16.3% of Co and 0% -5.1% of Fe; and the weighing errors of the metal and intermediate alloy raw materials are less than +/-0.1 percent;
step two, preparing AlCoCrFeNiTi series high-entropy alloy cast ingots from the metal and intermediate alloy raw materials prepared in the step one by adopting a vacuum arc furnace smelting method; the smelting current of the vacuum arc furnace smelting method is 300A-400A, the vacuum degree is less than 1X 10 -3 MPa, and a repeated smelting mode is adopted;
Thirdly, carrying out solution treatment on the AlCoCrFeNiTi series high-entropy alloy cast ingot prepared in the second step at 1250-1300 ℃ for 10 hours, and then carrying out aging treatment on the cast ingot at 800-850 ℃ for 6 hours to obtain AlCoCrFeNiTi series high-entropy alloy; the yield strength of AlCoCrFeNiTi high-entropy alloy exceeds 550MPa, the tensile strength exceeds 700MPa, and the elongation is not lower than 35%.
2. The method for preparing AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity according to claim 1, wherein copper mould is adopted to cool AlCoCrFeNiTi-series high-entropy alloy melt in the preparation process of the vacuum arc furnace smelting method in the second step, and the cooling rate is not lower than 20 ℃/s.
3. The method for preparing AlCoCrFeNiTi series high-entropy alloy with high strength and plasticity according to claim 1, wherein the AlCoCrFeNiTi series high-entropy alloy in the third step is wire-cut and then subjected to mechanical finish polishing treatment with metallographic grade, so as to obtain a tensile sample with the length x width x thickness of 4mm x 1mm x 0.5mm of the gauge length, and then the tensile sample is placed on a universal tensile testing machine, and tensile mechanical property test is carried out under the condition of a tensile rate of not higher than 1x 10 -3s-1.
4. The method for preparing the AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity according to claim 3, wherein the mechanical fine polishing treatment process of the metallographic grade is as follows: polishing under No. 600, no. 800, no. 1000 and No. 1500 abrasive paper in sequence, and then dipping the polished silk cloth in CrO 3 polishing solution containing Al 2O3 polishing powder for fine polishing until the surface roughness of the tensile sample is reduced to below 0.3 mu m.
5. The method for producing a AlCoCrFeNiTi-series high-entropy alloy with high strength and plasticity according to claim 3, wherein the tensile specimen is a lath tensile specimen.
6. A AlCoCrFeNiTi-series high-entropy alloy of high plasticity prepared by the method of any one of claims 1 to 5.
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