Preparation method of ultra-pure low-oxygen-activity high-entropy alloy

Abstract

The invention relates to a preparation method of an ultra-pure low-oxygen-activity high-entropy alloy, which comprises the following steps: S1, in a suspension smelting furnace with a feeding bin, adding pure titanium into a water-cooled copper crucible, and starting to smelt and absorb oxygen; s2, after pure titanium smelting is completed, cooling is conducted for 15-30 min in a water-cooling copper crucible, then a solidified alloy ingot is put into a mold in the furnace, and then the suspension smelting furnace is cooled; and S3, the high-entropy alloy raw materials are added into the water-cooled copper crucible through the feeding bin to be smelted, and the high-entropy alloy is obtained. According to the preparation method of the ultra-pure low-oxygen-activity high-entropy alloy, firstly, pure titanium is used for smelting and oxygen absorption, the oxygen element content in a furnace body and the alloy is effectively reduced, oxide inclusions in the alloy are further reduced, the inclusions are usually main reasons causing material performance reduction and machining difficulty, and therefore the preparation method of the ultra-pure low-oxygen-activity high-entropy alloy can be used for preparing the ultra-pure low-oxygen-activity high-entropy alloy. The high-entropy alloy prepared by the preparation method disclosed by the invention has higher strength and better processability, and is wider in industrial application.

Description

Technical Field

[0001] The invention relates to the technical field related to high entropy alloy smelting, and in particular to a method for preparing an ultra-pure low-oxygen active high entropy alloy. Background Art

[0002] In the field of melting active high entropy alloys, oxide ceramic crucibles are traditionally used. However, during high-temperature melting, these crucibles may decompose and release oxygen, thereby increasing the oxygen content in the furnace, leading to an increase in the oxygen content inside the alloy ingot, which in turn triggers the formation of cracks inside the alloy ingot. In addition, even at 3×10 -2 The smelting is carried out under a vacuum degree, the oxygen content in the furnace is still high, and the problem of alloy surface oxidation is still serious.

[0003] During the smelting process, the volatilization, oxidation and uneven distribution of elements will cause fluctuations in the properties of the alloy, ultimately affecting the quality of the product. In particular, the titanium (Ti) element is particularly active at high temperatures. It is not only easy to volatilize, but may also react with other impurity elements. This will cause the content of impurity elements inside the alloy ingot to exceed the standard, affecting the subsequent use of the alloy. The volatilization of the Ti element may also cause deviations in the composition of the alloy ingot, thereby affecting the performance of the finished product. At present, in order to achieve the homogenization of the alloy composition, it is usually necessary to go through a process of repeated smelting.

[0004] In summary, the traditional smelting method has problems such as insufficient oxygen content control, severe oxidation of the alloy surface, mixing of impurity elements, and volatilization of Ti elements, which together affect the performance and quality of active high entropy alloys. Therefore, it is necessary to develop new smelting technologies to solve these problems and improve the uniformity and performance of the alloy. Summary of the invention

[0005] In order to solve one or more of the technical problems existing in the prior art, the present invention provides a method for preparing an ultra-pure low-oxygen active high-entropy alloy.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: A method for preparing an ultra-pure low-oxygen active high-entropy alloy comprises the following steps:

[0007] S1, in a suspension smelting furnace with a charging bin, pure titanium is added to a water-cooled copper crucible and smelting and oxygen absorption begins;

[0008] S2, after the pure titanium is smelted, the solidified alloy ingot is placed into a mold in the furnace after cooling in a water-cooled copper crucible for 15-30 minutes, and then the suspension smelting furnace is cooled;

[0009] S3, adding high entropy alloy raw materials into a water-cooled copper crucible through a feeding bin for smelting to obtain a high entropy alloy.

[0010] The beneficial effects of the present invention are as follows: the preparation method of the ultra-pure low-oxygen active high-entropy alloy of the present invention first uses pure titanium for smelting and oxygen absorption, which effectively reduces the oxygen content in the furnace body and the alloy, and then reduces the oxide inclusions in the alloy. These inclusions are usually the main reasons for the degradation of material properties and processing difficulties. Therefore, the high-entropy alloy prepared by the preparation method of the present invention has higher strength and better processing performance, and is suitable for a wider range of industrial applications.

[0011] Based on the above technical solution, the present invention can also be improved as follows.

[0012] Further, in S1, pure titanium is added to a water-cooled copper crucible and smelting and oxygen absorption are started, including:

[0013] Pure titanium is added to a water-cooled copper crucible, and the suspension melting furnace is evacuated once and then filled with inert gas to start melting and oxygen absorption.

[0014] In S1, during the smelting oxygen absorption process, the suspension smelting furnace performs smelting according to the first smelting process curve;

[0015] The first smelting process curve includes six stages, namely:

[0016] In the first stage, the suspension smelting furnace power is 5-30kw and the heat preservation time is 1-3min;

[0017] In the second stage, the suspension smelting furnace power is 30-60kw, and the heat preservation is 1-3min;

[0018] In the third stage, the suspension smelting furnace has a power of 70-100kw and is kept warm for 1-3min;

[0019] In the fourth stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes;

[0020] In the fifth stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min;

[0021] In the sixth stage, the power of the suspension smelting furnace is 160-200kw, and the heat preservation time is 5-15min.

[0022] The beneficial effect of adopting the above further scheme is that by reasonably setting the first smelting process curve, effective and stable smelting of pure titanium can be achieved, and oxygen in the furnace can be fully absorbed.

[0023] By adding the titanium alloy oxygen absorption process and optimizing the smelting process, the oxygen content in the furnace is significantly reduced, which is crucial to reducing the oxygen content of the subsequent smelting alloy. The reduction in oxygen content can reduce oxide inclusions, thereby improving the overall performance of the alloy.

[0024] In S3, high entropy alloy raw materials are added to a water-cooled copper crucible through a charging bin for smelting, including:

[0025] A first group of high entropy alloy raw materials is added to a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a second melting process curve; when the first group of high entropy alloy raw materials are evenly melted, a second group of high entropy alloy raw materials is added to a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a third melting process curve; when the two groups of high entropy alloy raw materials are evenly melted, the power of the suspension melting furnace is reduced to cool the two groups of melted high entropy alloy raw materials in the water-cooled copper crucible.

[0026] The beneficial effect of adopting the above further scheme is that in the formal smelting and feeding process, the double feeding method can effectively avoid the volatilization of titanium elements and the combination with oxygen elements at high temperatures, and can reduce the subsequent smelting time required for the process, avoiding the need to remain in a high temperature environment for a long time after adding titanium elements, causing the volatilization of titanium elements and the reaction of other impurity elements and the entry of oxygen elements.

[0027] The second smelting process curve includes seven stages, namely:

[0028] In the first stage, the suspension smelting furnace has a power of 5 to 30 kW and is kept warm for 5 to 15 minutes;

[0029] In the second stage, the suspension smelting furnace power is 30-60kw, and the heat preservation is 1-3min;

[0030] In the third stage, the suspension smelting furnace power is 70-90kw, and the heat preservation is 1-3min;

[0031] In the fourth stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes;

[0032] In the fifth stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min;

[0033] In the sixth stage, the suspension smelting furnace has a power of 160-200 kW and is kept warm for 1-5 minutes;

[0034] In the seventh stage, the power of the suspension smelting furnace is 230-270kw, and the heat preservation time is 3-5min.

[0035] The beneficial effect of adopting the above further scheme is that by optimizing the smelting process, a uniform distribution of alloy components is achieved. This uniformity not only improves the performance consistency of the alloy, but also helps to improve processing efficiency and yield rate, and reduce production costs.

[0036] The third smelting process curve includes five stages, namely:

[0037] In the first stage, the suspension smelting furnace has a power of 70-100kw and is kept warm for 0.5-3min;

[0038] In the second stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes;

[0039] In the third stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min;

[0040] In the fourth stage, the suspension smelting furnace has a power of 160-200 kW and is kept warm for 1.5-3 minutes;

[0041] In the fifth stage, the power of the suspension smelting furnace is 230-270kw, and the heat preservation time is 2-4min.

[0042] The beneficial effect of adopting the above further scheme is that by optimizing the smelting process, a uniform distribution of alloy components is achieved. This uniformity not only improves the performance consistency of the alloy, but also helps to improve processing efficiency and yield rate, and reduce production costs.

[0043] For the main elements, especially the volatile titanium (Ti) element, specific smelting technology and process parameters are used to reduce its volatilization during the smelting process and maintain the stability of the alloy composition.

[0044] In S3, after the two groups of high entropy alloy raw materials are uniformly melted, the power of the suspension melting furnace is reduced to 5-20 kW within 5-30 s, and then the heat is kept for 0.1-3 min to cool the two groups of melted high entropy alloy raw materials in the water-cooled copper crucible;

[0045] After the power of the suspension melting furnace is reduced, the inert gas filling pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and argon gas is introduced into the top of the initially solidified high entropy alloy raw material for 0.5 to 3 minutes.

[0046] Furthermore, in S3, the two groups of melted high-entropy alloy raw materials are cooled in a water-cooled copper crucible, and then the high-entropy alloy ingot solidified in the water-cooled copper crucible is turned over in a suspension smelting furnace, and then smelted again using the fourth smelting process curve, and cooled after smelting to obtain a high-entropy alloy.

[0047] The beneficial effect of adopting the above further solution is that the re-smelting further ensures the uniformity of the alloy.

[0048] Furthermore, the fourth smelting process curve includes seven stages, namely:

[0049] In the first stage, the suspension smelting furnace power is 5-30kw and the heat preservation time is 1-3min;

[0050] In the second stage, the suspension smelting furnace power is 30-60kw, and the heat preservation is 1-3min;

[0051] In the third stage, the suspension smelting furnace has a power of 70-100kw and is kept warm for 1-3min;

[0052] In the fourth stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes;

[0053] In the fifth stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min;

[0054] In the sixth stage, the power of the suspension smelting furnace is 160-200kw, and the heat preservation is 1.5-3min;

[0055] In the seventh stage, the power of the suspension smelting furnace is 230-270kw, and the insulation time is 2-5min.

[0056] The beneficial effect of adopting the above further scheme is that by optimizing the smelting process, a uniform distribution of alloy components is achieved. This uniformity not only improves the performance consistency of the alloy, but also helps to improve processing efficiency and yield rate, and reduce production costs.

[0057] Further, in S3, cooling after smelting to obtain a high entropy alloy comprises:

[0058] After smelting, the power of the suspension smelting furnace is reduced to 5-20 kW within 5-30 s, and then kept warm for 0.1-1 min to cool the high entropy alloy raw material in a water-cooled copper crucible;

[0059] After the power of the suspension melting furnace is reduced, the inert gas filling pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and argon gas is introduced into the top of the re-solidified high entropy alloy ingot for 0.5 to 3 minutes to obtain the high entropy alloy.

[0060] The preparation method of the ultra-pure low-oxygen active high-entropy alloy of the present invention not only improves the purity and quality of the alloy through a series of innovative technical means, but also realizes the uniform distribution of the components. These beneficial effects work together to significantly improve the performance and application range of the alloy product of the present invention, and have important industrial application value and market potential. The present invention has the following advantages:

[0061] (1) Improvement of the purity of alloy components: The present invention significantly improves the purity of the alloy by effectively avoiding the reaction between impurity elements and main elements and preventing the volatilization of titanium (Ti). This improvement in purity helps to enhance the mechanical properties and corrosion resistance of the alloy, thereby extending the service life of the alloy and improving its reliability in harsh environments.

[0062] The present invention effectively inhibits the entry of impurity elements into the alloy by precisely controlling the smelting conditions and using a specially designed smelting furnace. This technical means includes but is not limited to using high-purity raw materials, optimizing the smelting atmosphere, and implementing precise temperature and time control, thereby minimizing the mixing of impurity elements during the smelting process.

[0063] (2) Significant improvement in alloy quality: By reducing the oxygen content in the furnace and the alloy, the present invention effectively improves the quality of the alloy. Reducing the oxygen content can reduce oxide inclusions in the alloy, which are usually the main cause of material performance degradation and processing difficulties. Therefore, the alloy provided by the present invention has higher strength and better processing performance, and is suitable for a wider range of industrial applications.

[0064] The present invention significantly reduces the oxygen content in the alloy by adding the Ti alloy oxygen absorption process and optimizing the smelting process. This step is crucial to improving the mechanical properties and corrosion resistance of the alloy, because the reduction of oxygen content can reduce oxide inclusions, thereby improving the overall quality of the alloy.

[0065] (3) Enhanced uniformity of alloy composition: The present invention also achieves uniform distribution of alloy composition, which is essential to ensure the consistency and reliability of the alloy. The uniformity of composition can reduce stress concentration inside the material and improve the overall performance of the material, especially in applications subject to complex stress states, such as aerospace, automotive manufacturing and precision engineering. In addition, uniform composition distribution also helps to improve the processing efficiency and yield rate of the alloy and reduce production costs.

[0066] The present invention achieves uniform distribution of alloy components by optimizing the smelting process and material discharge sequence. This uniformity not only improves the performance consistency of the alloy, but also helps to improve processing efficiency and yield rate, and reduce production costs. DETAILED DESCRIPTION

[0067] The principles and features of the present invention are described below. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0068] Example 1

[0069] Taking the preparation of TiZrVNb as an example, the mass ratio is 0.1692:0.3224:0.1801:0.3283, and the total mass is 4 kg.

[0070] A method for preparing a high entropy alloy TiZrVNb in this embodiment comprises the following steps:

[0071] S1, in a suspension smelting furnace with a charging bin, 3-4 kg of pure titanium is added to a water-cooled copper crucible, and the suspension smelting furnace is vacuumed once (the vacuum degree reaches 3×10-3 Pa below), then fill in argon with a purity higher than 99.999%, the furnace vacuum count value should be -0.05±0.01 (i.e. 0.05 atmospheres), and start smelting and oxygen absorption.

[0072] In S1, during the smelting oxygen absorption process, the suspension smelting furnace performs smelting according to the first smelting process curve to fully consume the oxygen element in the furnace and shorten the subsequent vacuum pumping time;

[0073] The first smelting process curve includes six stages, namely:

[0074] In the first stage, the suspension smelting furnace power is 5kw and the heat preservation time is 3min;

[0075] In the second stage, the suspension smelting furnace power is 30kw and the heat preservation time is 3min;

[0076] In the third stage, the suspension smelting furnace power is 70kw and the heat preservation time is 3min;

[0077] In the fourth stage, the suspension smelting furnace power is 100kw and the heat preservation time is 3min;

[0078] In the fifth stage, the suspension smelting furnace power is 130kw and the heat preservation is 3min;

[0079] In the sixth stage, the suspension smelting furnace has a power of 160 kW and is kept warm for 15 minutes.

[0080] S2, after the pure titanium is smelted, the solidified alloy ingot is cooled in a water-cooled copper crucible for 15-30 minutes and then placed into a metal mold in the furnace, and then the suspension smelting furnace is cooled;

[0081] In addition, the furnace body was vacuumed twice under closed conditions to achieve a vacuum degree of 5×10 -4 After Pa, argon gas with a purity higher than 99.999% was introduced, the vacuum count value was -0.05±0.01 (i.e. 0.05 atmospheres), and then smelting began.

[0082] S3, adding a first group of high entropy alloy raw materials (the first group of raw materials is ZrVNb) into a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a second melting process curve; when the first group of high entropy alloy raw materials are evenly melted, adding a second group of high entropy alloy raw materials (the second group of raw materials is Ti) into a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a third melting process curve;

[0083] The second smelting process curve includes seven stages, namely:

[0084] In the first stage, the suspension smelting furnace power is 5kw and the heat preservation time is 15min;

[0085] In the second stage, the suspension smelting furnace power is 30kw and the heat preservation time is 3min;

[0086] In the third stage, the suspension smelting furnace power is 70kw and the heat preservation time is 3min;

[0087] In the fourth stage, the suspension smelting furnace power is 100kw and the heat preservation time is 3min;

[0088] In the fifth stage, the suspension smelting furnace power is 130kw and the heat preservation is 3min;

[0089] In the sixth stage, the suspension smelting furnace has a power of 160kw and is kept warm for 3min.

[0090] In the seventh stage, the suspension smelting furnace has a power of 230 kW and is kept warm for 5 minutes.

[0091] The third smelting process curve includes five stages, namely:

[0092] In the first stage, the suspension smelting furnace power is 70kw and the heat preservation time is 3min;

[0093] In the second stage, the suspension smelting furnace power is 100kw and the temperature is kept for 3min;

[0094] In the third stage, the suspension smelting furnace power is 130kw and the temperature is kept for 3min;

[0095] In the fourth stage, the suspension smelting furnace power is 160kw and the heat preservation is 3min;

[0096] In the fifth stage, the suspension smelting furnace has a power of 230kw and is kept warm for 4 minutes.

[0097] When the two groups of high entropy alloy raw materials are evenly melted, the power of the suspension melting furnace is reduced to 5 kW within 5 seconds, and then kept warm for 3 minutes to allow the two groups of melted high entropy alloy raw materials to cool in the water-cooled copper crucible; after the power of the suspension melting furnace is reduced, the inert gas filling pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and argon gas is introduced into the top of the initially solidified high entropy alloy raw materials for 0.5 minutes.

[0098] After the high entropy alloy raw material is cooled in the water-cooled copper crucible, the high entropy alloy ingot solidified in the water-cooled copper crucible is turned over in the suspension smelting furnace and then smelted again using the fourth smelting process curve.

[0099] The fourth smelting process curve includes seven stages, namely:

[0100] In the first stage, the suspension smelting furnace power is 5kw and the heat preservation time is 3min;

[0101] In the second stage, the suspension smelting furnace power is 30kw and the heat preservation time is 3min;

[0102] In the third stage, the suspension smelting furnace power is 70kw and the heat preservation time is 3min;

[0103] In the fourth stage, the suspension smelting furnace power is 100kw and the heat preservation time is 3min;

[0104] In the fifth stage, the suspension smelting furnace power is 130kw and the heat preservation is 3min;

[0105] In the sixth stage, the suspension smelting furnace power is 160kw and the heat preservation is 3min;

[0106] In the seventh stage, the suspension smelting furnace has a power of 230 kW and is kept warm for 5 minutes.

[0107] After smelting, the power of the suspension smelting furnace was reduced to 5 kW within 30 s, and then kept warm for 1 min to allow the high entropy alloy raw material to cool in the water-cooled copper crucible. After the power of the suspension smelting furnace was reduced, the inert gas filling pipe built into the suspension smelting furnace was moved to the top of the water-cooled copper crucible and argon gas was introduced into the top of the re-solidified high entropy alloy ingot for 0.5 min to obtain the high entropy alloy.

[0108] Comparative Example 1

[0109] The difference between Comparative Example 1 and Example 1 is that the suspension smelting furnace of Comparative Example 1 does not perform the smelting oxygen absorption process of S1 of Example 1, and the raw materials are not placed separately during the S3 suspension smelting process. The rest is the same as Example 1.

[0110] The composition of the high entropy alloys obtained in Example 1 and Comparative Example 1 was determined according to the standard chemical analysis method for sponge titanium, titanium and titanium alloys GB / T 4698 (the same below). The composition distribution of the high entropy alloys of Example 1 and Comparative Example 1 is shown in Table 1.

[0111] Table 1 Composition distribution of high entropy alloys obtained in Example 1 and Comparative Example 1 (wt.%)

[0112]

[0113] As can be seen from Table 1, the smelting with pure Ti before the formal smelting can fully absorb the oxygen element inside the furnace body, thereby achieving the purpose of reducing the oxygen content in the furnace, providing an environment with a lower oxygen content for the subsequent smelting process, and ensuring the quality of the alloy; in the material distribution process of the formal smelting, the use of two feeding methods can effectively avoid the volatilization of the Ti element and its combination with the oxygen element at high temperature, and this process can be used to shorten the subsequent smelting time, avoiding the need to be in a high temperature environment for a long time after adding the Ti element, causing the volatilization of the Ti element and its reaction with impurity elements and the entry of oxygen elements. In addition, the two-stage heating process can make other elements fully react and be more uniform in the first heating process, and the second heating process allows the Ti element to fully react with other main elements to achieve alloy homogenization.

[0114] Example 2

[0115] Taking the preparation of TiZrVNb as an example, the mass ratio is 0.1692:0.3224:0.1801:0.3283, and the total mass is 4 kg.

[0116] A method for preparing a high entropy alloy TiZrVNb in this embodiment comprises the following steps:

[0117] S1, in a suspension smelting furnace with a charging bin, 3-4 kg of pure titanium is added to a water-cooled copper crucible, and the suspension smelting furnace is vacuumed once (the vacuum degree reaches 3×10 -3 Pa below), then fill in argon with a purity higher than 99.999%, the furnace vacuum count value should be -0.05±0.01 (i.e. 0.05 atmospheres), and start smelting and oxygen absorption.

[0118] In S1, during the smelting oxygen absorption process, the suspension smelting furnace performs smelting according to the first smelting process curve to fully consume the oxygen element in the furnace and shorten the subsequent vacuum pumping time;

[0119] The first smelting process curve includes six stages, namely:

[0120] In the first stage, the suspension smelting furnace power is 8kw and the heat preservation is 1min;

[0121] In the second stage, the suspension smelting furnace power is 50kw and the temperature is kept for 1min;

[0122] In the third stage, the suspension smelting furnace power is 80kw and the temperature is kept for 1min;

[0123] In the fourth stage, the suspension smelting furnace power is 110kw and the heat preservation is 2min;

[0124] In the fifth stage, the suspension smelting furnace power is 140kw and the heat preservation is 1min;

[0125] In the sixth stage, the suspension smelting furnace power is 180kw and the heat preservation is 10min;

[0126] S2, after the pure titanium is smelted, the solidified alloy ingot is cooled in a water-cooled copper crucible for 15-30 minutes, and then placed into a metal mold in the crucible, and then the suspension smelting furnace is cooled;

[0127] In addition, the furnace body was vacuumed twice under closed conditions to achieve a vacuum degree of 5×10 -4 Pa and argon gas with a purity higher than 99.999% was introduced, the vacuum count value was -0.05, and then smelting began.

[0128] S3, adding a first group of high entropy alloy raw materials (the first group of raw materials is ZrVNb) into a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a second melting process curve; when the first group of high entropy alloy raw materials are evenly melted, adding a second group of high entropy alloy raw materials (the second group of raw materials is Ti) into a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a third melting process curve;

[0129] The second smelting process curve includes seven stages, namely:

[0130] In the first stage, the suspension smelting furnace power is 15kw and the heat preservation time is 15min;

[0131] In the second stage, the suspension smelting furnace power is 50kw and the temperature is kept for 2min;

[0132] In the third stage, the suspension smelting furnace power is 80kw and the temperature is kept for 1min;

[0133] In the fourth stage, the suspension smelting furnace power is 100kw and the heat preservation is 1min;

[0134] In the fifth stage, the suspension smelting furnace power is 140kw and the heat preservation is 1min;

[0135] In the sixth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 3min;

[0136] In the seventh stage, the suspension smelting furnace has a power of 250kw and is kept warm for 3.5min;

[0137] The third smelting process curve includes five stages, namely:

[0138] In the first stage, the suspension smelting furnace power is 75kw and the heat preservation time is 1.5min;

[0139] In the second stage, the suspension smelting furnace power is 110kw and the temperature is kept for 1min;

[0140] In the third stage, the suspension smelting furnace power is 140kw and the heat preservation is 1min;

[0141] In the fourth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 2.5min;

[0142] In the fifth stage, the suspension smelting furnace power is 250kw and the heat preservation time is 3min;

[0143] After the two groups of high entropy alloy raw materials are evenly melted, the power of the suspension melting furnace is reduced to 10 kW within 10 seconds, and then kept warm for 0.2 minutes to allow the two groups of melted high entropy alloy raw materials to cool in the water-cooled copper crucible; after the power of the suspension melting furnace is reduced, the inert gas filling pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and argon gas is introduced into the top of the initially solidified high entropy alloy raw materials for 1.2 minutes.

[0144] After the high entropy alloy raw material is cooled in the water-cooled copper crucible, the high entropy alloy raw material solidified in the water-cooled copper crucible is turned over in the suspension melting furnace and then melted again using the fourth melting process curve.

[0145] The fourth smelting process curve includes seven stages, namely:

[0146] In the first stage, the suspension smelting furnace power is 25kw and the heat preservation time is 2min;

[0147] In the second stage, the suspension smelting furnace power is 55kw and the temperature is kept for 3min;

[0148] In the third stage, the suspension smelting furnace power is 80kw and the temperature is kept for 1min;

[0149] In the fourth stage, the suspension smelting furnace power is 110kw and the heat preservation is 1.5min;

[0150] In the fifth stage, the suspension smelting furnace power is 140kw and the heat preservation is 3min;

[0151] In the sixth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 2min;

[0152] In the seventh stage, the suspension smelting furnace power is 245kw and the heat preservation time is 3.5min;

[0153] After smelting, the power of the suspension smelting furnace was reduced to 10 kW within 10 s, and then kept warm for 0.2 min to allow the high entropy alloy raw material to cool in the water-cooled copper crucible; after the power of the suspension smelting furnace was reduced, the inert gas filling pipe built into the suspension smelting furnace was moved to the top of the water-cooled copper crucible and argon gas was introduced into the top of the re-solidified high entropy alloy raw material for 0.8 min to obtain the high entropy alloy.

[0154] Comparative Example 2

[0155] The difference between Comparative Example 2 and Example 2 is that Comparative Example 2 does not perform the smelting oxygen absorption process of S1 of Example 2 on the suspension smelting furnace, and the raw materials are not placed separately during the S3 suspension smelting process. The rest is the same as Example 2.

[0156] The composition of the high entropy alloys obtained in Example 2 and Comparative Example 2 was measured. The composition distribution of the high entropy alloys in Example 2 and Comparative Example 2 is shown in Table 2.

[0157] Table 2 Composition distribution of high entropy alloys obtained in Example 2 and Comparative Example 2 (wt.%)

[0158]

[0159] As shown in Table 2, the smelting with pure Ti before the formal smelting can fully absorb the oxygen element inside the furnace body, thereby achieving the purpose of reducing the oxygen content in the furnace, providing an environment with a lower oxygen content for the subsequent smelting process, and ensuring the quality of the alloy; in the material distribution process of the formal smelting, the use of two feeding methods can effectively avoid the volatilization of the Ti element and its combination with the oxygen element at high temperature, and this process can be used to shorten the subsequent smelting time, avoiding the need to be in a high temperature environment for a long time after adding the Ti element, causing the volatilization of the Ti element and its reaction with impurity elements and the entry of oxygen elements. In addition, the two-stage heating process can make other elements fully react and be more uniform in the first heating process, and the second heating process allows the Ti element to fully react with other main elements to achieve alloy homogenization.

[0160] Example 3

[0161] Taking the preparation of HfNbZrTi as an example, the mass ratio is 0.4348:0.2263:0.2222:0.1167, and the total mass is 4 kg.

[0162] A method for preparing a high entropy alloy HfNbZrTi in this embodiment comprises the following steps:

[0163] S1, in a suspension smelting furnace with a charging bin, 3-4 kg of pure titanium is added to a water-cooled copper crucible, and the suspension smelting furnace is vacuumed once (the vacuum degree reaches 3×10 -3 Pa below), then fill in argon with a purity higher than 99.999%, the furnace vacuum count value should be -0.05±0.01 (i.e. 0.05 atmospheres), and start smelting and oxygen absorption.

[0164] In S1, during the smelting oxygen absorption process, the suspension smelting furnace performs smelting according to the first smelting process curve to fully consume the oxygen element in the furnace and shorten the subsequent vacuum pumping time;

[0165] The first smelting process curve includes six stages, namely:

[0166] In the first stage, the suspension smelting furnace power is 8kw and the heat preservation is 1min;

[0167] In the second stage, the suspension smelting furnace power is 50kw and the temperature is kept for 1min;

[0168] In the third stage, the suspension smelting furnace power is 80kw and the temperature is kept for 1min;

[0169] In the fourth stage, the suspension smelting furnace power is 110kw and the heat preservation is 2min;

[0170] In the fifth stage, the suspension smelting furnace power is 140kw and the heat preservation is 1min;

[0171] In the sixth stage, the suspension smelting furnace has a power of 180 kW and is kept warm for 10 minutes.

[0172] S2, after the pure titanium is smelted, the solidified alloy ingot is cooled in a water-cooled copper crucible for 15-30 minutes, and then placed into a metal mold in the crucible, and then the suspension smelting furnace is cooled;

[0173] In addition, the furnace body was vacuumed twice under closed conditions to achieve a vacuum degree of 5×10 -4 Pa and argon gas with a purity higher than 99.999% was introduced, the vacuum count value was -0.05, and then smelting began.

[0174] S3, adding a first group of high entropy alloy raw materials (the first group of raw materials is HfNbZr) into a water-cooled copper crucible through a charging bin, and the suspension smelting furnace performs smelting according to a second smelting process curve; when the first group of high entropy alloy raw materials are uniformly melted, adding a second group of high entropy alloy raw materials (the second group of raw materials is Ti) into a water-cooled copper crucible through a charging bin, and the suspension smelting furnace performs smelting according to a third smelting process curve;

[0175] The second smelting process curve includes seven stages, namely:

[0176] In the first stage, the suspension smelting furnace power is 10kw and the heat preservation time is 13min;

[0177] In the second stage, the suspension smelting furnace power is 50kw and the temperature is kept for 3min;

[0178] In the third stage, the suspension smelting furnace power is 80kw and the temperature is kept for 1min;

[0179] In the fourth stage, the suspension smelting furnace power is 100kw and the heat preservation time is 1.5min;

[0180] In the fifth stage, the suspension smelting furnace power is 140kw and the temperature is kept for 2min;

[0181] In the sixth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 3min;

[0182] In the seventh stage, the suspension smelting furnace power is 260kw and the heat preservation time is 4min;

[0183] The third smelting process curve includes five stages, namely:

[0184] In the first stage, the suspension smelting furnace power is 80kw and the heat preservation time is 1.5min;

[0185] In the second stage, the suspension smelting furnace power is 110kw and the heat preservation time is 1.5min;

[0186] In the third stage, the suspension smelting furnace power is 140kw and the heat preservation time is 2min;

[0187] In the fourth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 3min;

[0188] In the fifth stage, the suspension smelting furnace power is 260kw and the heat preservation time is 3.5min;

[0189] When the two groups of high entropy alloy raw materials are evenly melted, the power of the suspension melting furnace is reduced to 10 kW within 10 seconds, and then kept warm for 0.2 minutes to allow the two groups of melted high entropy alloy raw materials to cool in the water-cooled copper crucible; after the power of the suspension melting furnace is reduced, the inert gas filling pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and argon gas is introduced into the top of the initially solidified high entropy alloy raw materials for 1 minute.

[0190] After the high entropy alloy raw material is cooled in the water-cooled copper crucible, the high entropy alloy raw material solidified in the water-cooled copper crucible is turned over in the suspension melting furnace and then melted again using the fourth melting process curve.

[0191] The fourth smelting process curve includes seven stages, namely:

[0192] In the first stage, the suspension smelting furnace power is 25kw and the heat preservation time is 3min;

[0193] In the second stage, the suspension smelting furnace power is 60kw and the temperature is kept for 2min;

[0194] In the third stage, the suspension smelting furnace power is 80kw and the temperature is kept for 1min;

[0195] In the fourth stage, the suspension smelting furnace power is 110kw and the heat preservation is 2min;

[0196] In the fifth stage, the suspension smelting furnace power is 140kw and the heat preservation is 3min;

[0197] In the sixth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 1.5min;

[0198] In the seventh stage, the suspension smelting furnace power is 250kw and the heat preservation time is 4min;

[0199] After smelting, the power of the suspension smelting furnace was reduced to 12 kW within 10 seconds, and then kept warm for 0.1 min to allow the high entropy alloy raw material to cool in the water-cooled copper crucible; after the power of the suspension smelting furnace was reduced, the inert gas filling pipe built into the suspension smelting furnace was moved to the top of the water-cooled copper crucible and argon gas was introduced into the top of the re-solidified high entropy alloy raw material for 0.5 min to obtain the high entropy alloy.

[0200] Comparative Example 3

[0201] The difference between Comparative Example 3 and Example 3 is that, in Comparative Example 3, the suspension smelting furnace is not subjected to the smelting oxygen absorption process of S1 of Example 3, and the raw materials are not placed separately during the suspension smelting process of S3.

[0202] The composition of the high entropy alloys obtained in Example 3 and Comparative Example 3 was measured. The composition distribution of the high entropy alloys in Example 3 and Comparative Example 3 is shown in Table 3.

[0203] Table 3 Composition distribution of high entropy alloys obtained in Example 3 and Comparative Example 3 (wt.%)

[0204]

[0205] As shown in Table 3, the smelting with pure Ti before the formal smelting can fully absorb the oxygen element inside the furnace body, thereby achieving the purpose of reducing the oxygen content in the furnace, providing an environment with a lower oxygen content for the subsequent smelting process, and ensuring the quality of the alloy; in the material distribution process of the formal smelting, the use of two feeding methods can effectively avoid the volatilization of the Ti element and its combination with the oxygen element at high temperature, and this process can be used to shorten the subsequent smelting time, avoiding the need to be in a high temperature environment for a long time after adding the Ti element, causing the volatilization of the Ti element and its reaction with impurity elements and the entry of oxygen elements. In addition, the two-stage heating process can make other elements fully react and be more uniform in the first heating process, and the second heating process allows the Ti element to fully react with other main elements to achieve alloy homogenization.

[0206] Example 4

[0207] Taking the preparation of HfNbZrTi as an example, the mass ratio is 0.4348:0.2263:0.2222:0.1167, and the total mass is 4 kg.

[0208] A method for preparing a high entropy alloy HfNbZrTi in this embodiment comprises the following steps:

[0209] S1, in a suspension smelting furnace with a charging bin, 3-4 kg of pure titanium is added to a water-cooled copper crucible, and the suspension smelting furnace is vacuumed once (the vacuum degree reaches 3×10 -3 Pa below), then fill in argon with a purity higher than 99.999%, the furnace vacuum count value should be -0.05±0.01 (i.e. 0.05 atmospheres), and start smelting and oxygen absorption.

[0210] In S1, during the smelting oxygen absorption process, the suspension smelting furnace performs smelting according to the first smelting process curve to fully consume the oxygen element in the furnace and shorten the subsequent vacuum pumping time;

[0211] The first smelting process curve includes six stages, namely:

[0212] In the first stage, the suspension smelting furnace power is 30kw and the heat preservation time is 1min;

[0213] In the second stage, the suspension smelting furnace power is 60kw and the heat preservation is 1min;

[0214] In the third stage, the suspension smelting furnace power is 100kw and the temperature is kept for 1min;

[0215] In the fourth stage, the suspension smelting furnace power is 120kw and the heat preservation is 1min;

[0216] In the fifth stage, the suspension smelting furnace power is 150kw and the heat preservation time is 1min;

[0217] In the sixth stage, the suspension smelting furnace has a power of 200 kW and is kept warm for 5 minutes.

[0218] S2, after the pure titanium is smelted, the solidified alloy ingot is cooled in a water-cooled copper crucible for 15-30 minutes, and then placed into a metal mold in the crucible, and then the suspension smelting furnace is cooled;

[0219] In addition, the furnace body was vacuumed twice under closed conditions to achieve a vacuum degree of 5×10 -4 Pa and argon gas with a purity higher than 99.999% was introduced, the vacuum count value was -0.05, and then smelting began.

[0220] S3, adding a first group of high entropy alloy raw materials (the first group of raw materials is HfNbZr) into a water-cooled copper crucible through a charging bin, and the suspension smelting furnace performs smelting according to a second smelting process curve; when the first group of high entropy alloy raw materials are uniformly melted, adding a second group of high entropy alloy raw materials (the second group of raw materials is Ti) into a water-cooled copper crucible through a charging bin, and the suspension smelting furnace performs smelting according to a third smelting process curve;

[0221] The second smelting process curve includes seven stages, namely:

[0222] In the first stage, the suspension smelting furnace power is 30kw and the temperature is kept for 5min;

[0223] In the second stage, the suspension smelting furnace power is 60kw and the heat preservation is 1min;

[0224] In the third stage, the suspension smelting furnace power is 90kw and the temperature is kept for 1min;

[0225] In the fourth stage, the suspension smelting furnace power is 120kw and the heat preservation is 1min;

[0226] In the fifth stage, the suspension smelting furnace power is 150kw and the heat preservation time is 1min;

[0227] In the sixth stage, the suspension smelting furnace has a power of 200 kW and is kept warm for 1 minute.

[0228] In the seventh stage, the suspension smelting furnace has a power of 270kw and is kept warm for 2min.

[0229] The third smelting process curve includes five stages, namely:

[0230] In the first stage, the suspension smelting furnace power is 100kw and the heat preservation is 0.5min;

[0231] In the second stage, the suspension smelting furnace power is 120kw and the temperature is kept for 1min;

[0232] In the third stage, the suspension smelting furnace power is 150kw and the temperature is kept for 1min;

[0233] In the fourth stage, the suspension smelting furnace power is 200kw and the heat preservation time is 1.5min;

[0234] In the fifth stage, the suspension smelting furnace power is 270kw and the heat preservation is 2min;

[0235] After the two groups of high entropy alloy raw materials are evenly melted, the power of the suspension melting furnace is reduced to 20 kW within 30 seconds, and then kept warm for 1 minute to allow the two groups of melted high entropy alloy raw materials to cool in the water-cooled copper crucible; after the power of the suspension melting furnace is reduced, the inert gas filling pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and argon gas is introduced into the top of the initially solidified high entropy alloy raw materials for 3 minutes.

[0236] After the high entropy alloy raw material is cooled in the water-cooled copper crucible, the high entropy alloy raw material solidified in the water-cooled copper crucible is turned over in the suspension melting furnace and then melted again using the fourth melting process curve.

[0237] The fourth smelting process curve includes seven stages, namely:

[0238] In the first stage, the suspension smelting furnace power is 30kw and the heat preservation time is 1min;

[0239] In the second stage, the suspension smelting furnace power is 60kw and the heat preservation is 1min;

[0240] In the third stage, the suspension smelting furnace power is 100kw and the temperature is kept for 1min;

[0241] In the fourth stage, the suspension smelting furnace power is 120kw and the heat preservation is 1min;

[0242] In the fifth stage, the suspension smelting furnace power is 150kw and the heat preservation time is 1min;

[0243] In the sixth stage, the suspension smelting furnace has a power of 200 kW and is kept warm for 1.5 minutes.

[0244] In the seventh stage, the suspension smelting furnace has a power of 270kw and is kept warm for 2min.

[0245] After smelting, the power of the suspension melting furnace was reduced to 20 kW within 5 seconds, and then kept warm for 0.1 min to allow the high entropy alloy raw material to cool in the water-cooled copper crucible; after the power of the suspension melting furnace was reduced, the inert gas filling pipe built into the suspension melting furnace was moved to the top of the water-cooled copper crucible and argon gas was introduced into the top of the re-solidified high entropy alloy raw material for 3 minutes to obtain the high entropy alloy.

[0246] Comparative Example 4

[0247] The difference between Comparative Example 4 and Example 4 is that, in Comparative Example 4, the suspension smelting furnace is not subjected to the smelting oxygen absorption process of S1 of Example 4, and the raw materials are not placed separately during the suspension smelting process of S3.

[0248] The composition of the high entropy alloys obtained in Example 4 and Comparative Example 4 was measured. The composition distribution of the high entropy alloys of Example 4 and Comparative Example 4 is shown in Table 4.

[0249] Table 4 Composition distribution of high entropy alloys obtained in Example 4 and Comparative Example 4 (wt.%)

[0250]

[0251] As shown in Table 4, the smelting with pure Ti before the formal smelting can fully absorb the oxygen element inside the furnace body, thereby achieving the purpose of reducing the oxygen content in the furnace, providing an environment with a lower oxygen content for the subsequent smelting process, and ensuring the quality of the alloy; in the material distribution process of the formal smelting, the use of two feeding methods can effectively avoid the volatilization of the Ti element and its combination with the oxygen element at high temperature, and the subsequent smelting time can be shortened with the help of this process, avoiding the volatilization of the Ti element and its reaction with the impurity elements and the entry of the oxygen element after the addition of the Ti element. In addition, the two-stage heating process can make other elements fully react in the first heating process and be more uniform, and the second heating process allows the Ti element to fully react with other main elements to achieve the uniformity of the alloy.

[0252] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0253] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0254] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for preparing an ultra-pure low-oxygen active high-entropy alloy, characterized in that: The following steps are involved: S1, in a suspension smelting furnace with a charging bin, pure titanium is added to a water-cooled copper crucible and smelting and oxygen absorption begins; S2, after the pure titanium is smelted, the solidified alloy ingot is placed into a mold in the furnace after cooling in a water-cooled copper crucible for 15-30 minutes, and then the suspension smelting furnace is cooled; S3, adding high entropy alloy raw materials into a water-cooled copper crucible through a feeding bin for smelting to obtain a high entropy alloy.

2. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 1, characterized in that: In S1, pure titanium is added to a water-cooled copper crucible and smelting and oxygen absorption are started, including: Pure titanium is added to a water-cooled copper crucible, and the suspension melting furnace is evacuated once and then filled with inert gas to start melting and oxygen absorption.

3. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 1, characterized in that: In S1, during the smelting oxygen absorption process, the suspension smelting furnace performs smelting according to the first smelting process curve; The first smelting process curve includes six stages, namely: In the first stage, the suspension smelting furnace power is 5-30kw and the heat preservation time is 1-3min; In the second stage, the suspension smelting furnace power is 30-60kw, and the heat preservation is 1-3min; In the third stage, the suspension smelting furnace has a power of 70-100kw and is kept warm for 1-3min; In the fourth stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes; In the fifth stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min; In the sixth stage, the power of the suspension smelting furnace is 160-200kw, and the heat preservation time is 5-15min.

4. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 1, characterized in that: In S3, high entropy alloy raw materials are added to a water-cooled copper crucible through a charging bin for smelting, including: A first group of high entropy alloy raw materials is added to a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a second melting process curve; when the first group of high entropy alloy raw materials are evenly melted, a second group of high entropy alloy raw materials is added to a water-cooled copper crucible through a charging bin, and the suspension melting furnace performs melting according to a third melting process curve; when the two groups of high entropy alloy raw materials are evenly melted, the power of the suspension melting furnace is reduced to cool the two groups of melted high entropy alloy raw materials in the water-cooled copper crucible.

5. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 4, characterized in that: The second smelting process curve includes seven stages, namely: In the first stage, the suspension smelting furnace has a power of 5 to 30 kW and is kept warm for 5 to 15 minutes; In the second stage, the suspension smelting furnace power is 30-60kw, and the heat preservation is 1-3min; In the third stage, the suspension smelting furnace power is 70-90kw, and the heat preservation is 1-3min; In the fourth stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes; In the fifth stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min; In the sixth stage, the suspension smelting furnace has a power of 160-200 kW and is kept warm for 1-5 minutes; In the seventh stage, the power of the suspension smelting furnace is 230-270kw, and the heat preservation time is 3-5min.

6. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 4, characterized in that: The third smelting process curve includes five stages, namely: In the first stage, the suspension smelting furnace has a power of 70-100kw and is kept warm for 0.5-3min; In the second stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes; In the third stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min; In the fourth stage, the suspension smelting furnace has a power of 160-200 kW and is kept warm for 1.5-3 minutes; In the fifth stage, the power of the suspension smelting furnace is 230-270kw, and the heat preservation time is 2-4min.

7. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 4, characterized in that: In S3, after the two groups of high entropy alloy raw materials are uniformly melted, the power of the suspension melting furnace is reduced to 5-20 kW within 5-30 s, and then the heat is kept for 0.1-3 min to cool the two groups of melted high entropy alloy raw materials in the water-cooled copper crucible; After the power of the suspension melting furnace is reduced, the inert gas charging pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and the inert gas is started to be introduced into the top of the initially solidified high entropy alloy raw material for 0.5 to 3 minutes.

8. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 4, characterized in that: In S3, the two groups of melted high entropy alloy raw materials are cooled in a water-cooled copper crucible, and then the high entropy alloy ingot solidified in the water-cooled copper crucible is turned over in a suspension smelting furnace, and then smelted again using the fourth smelting process curve, and cooled after smelting to obtain a high entropy alloy.

9. A method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 8, characterized in that: The fourth smelting process curve includes seven stages, namely: In the first stage, the suspension smelting furnace power is 5-30kw and the heat preservation time is 1-3min; In the second stage, the suspension smelting furnace power is 30-60kw, and the heat preservation is 1-3min; In the third stage, the suspension smelting furnace has a power of 70-100kw and is kept warm for 1-3min; In the fourth stage, the suspension smelting furnace has a power of 100-120 kW and is kept warm for 1-3 minutes; In the fifth stage, the suspension smelting furnace has a power of 130-150kw and is kept warm for 1-3min; In the sixth stage, the power of the suspension smelting furnace is 160-200kw, and the heat preservation is 1.5-3min; In the seventh stage, the power of the suspension smelting furnace is 230-270kw, and the heat preservation time is 2-5min.

10. The method for preparing an ultra-pure low-oxygen active high-entropy alloy according to claim 8, characterized in that: In S3, the high entropy alloy is obtained by cooling after melting, including: After smelting, the power of the suspension smelting furnace is reduced to 5-20 kW within 5-30 s, and then kept warm for 0.1-1 min to cool the high entropy alloy raw material in a water-cooled copper crucible; After the power of the suspension melting furnace is reduced, the inert gas charging pipe built into the suspension melting furnace is moved to the top of the water-cooled copper crucible and the inert gas is introduced into the top of the re-solidified high entropy alloy ingot for 0.5 to 3 minutes to obtain the high entropy alloy.

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