A B-element microalloyed high-wear-resistant bulk high-entropy alloy and its preparation method and application

Abstract

The present invention belongs to the technical field of the design and preparation of new alloy materials, and particularly relates to a B-element micro-alloyed high-wear-resistant bulk high-entropy alloy, its preparation method and application. The chemical composition of the high-entropy alloy and the corresponding mass percentages are as follows: Al: 10.70 - 10.82 wt%, Cr: 20.80 - 20.94 wt%, Ni: 35.40 - 35.56 wt%, Ti: 19.20 - 19.33 wt%, B: 0.10 - 0.25 wt%, and the rest is Fe and inevitable impurities. Moreover, the chemical composition needs to simultaneously satisfy the following three relational expressions: (1) 52 < Fe / B < 138; (2) 1.2 < Fe / (B + Al) < 1.3; (3) 0.7 < Fe / (B + Ti) < 1.3. Its dendritic structure is obvious, the structure distribution is uniform, it has high hardness and good wear resistance. Compared with the traditional wear-resistant material NM500, its wear resistance is increased by 3 - 5 times under the same hardness. After undergoing two-step tempering heat treatment with the same parameters, the hardness of NM500 is reduced by 58.64 - 68.93% compared with its quenched and tempered state, and the hardness of the material of the present invention is reduced by 15.85 - 18.09% compared with its as-cast state, showing more excellent high-temperature stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of new alloy material design and preparation, and specifically relates to a B element microalloyed high wear resistant bulk high entropy alloy and its preparation method and application. Background Art

[0002] Multi-principal-element high-entropy alloys (HEAs), first proposed by Professor Ye Junwei in 2004, are a new class of alloys composed of five or more metallic elements in equal or near-equal molar ratios. These alloys break with the traditional design philosophy of single-element-based alloys and offer exceptional performance and unprecedented application prospects. Their remarkable properties, driven by four unique effects, offer new insights into the field of wear-resistant materials.

[0003] The patented technology "A method for preparing AlCoCrFeNi series dual-phase high-entropy alloys" (CN113025865A) describes a high-entropy alloy ingot and the mass percentages of each element: Co: 20.91% to 22.31wt%, Cr: 18.45% to 19.68wt%, Fe: 19.82% to 21.14wt%, Ni: 26.66% to 31.24wt%, with the remainder being Al, and the sum of the atomic percentages of each component is 100%. The high-entropy alloy ingot is prepared by vacuum arc melting and processed into cast rods. The high-entropy alloy cast rods have a yield strength of 960MPa, a fracture strength of 1270MPa, and an elongation of 1.3%. Although this technology significantly improves the strength and toughness of high-entropy alloys, its elongation is significantly lower than that of general high-entropy alloys, and there is much room for improvement in both hardness and wear resistance.

[0004] The patented technology of "A superhard and wear-resistant high-entropy alloy and its preparation method" (CN112831710A) describes a high-entropy alloy ingot and the mass percentage of each element: the basic components are Ta, Nb, W, and Mo, and the strengthening components are Fe, Co, and Cr, with the basic components being matched with one or two strengthening components in equal molar ratios. The high-entropy alloy ingot is prepared by vacuum arc melting. The hardness of the high-entropy alloy ingot is 1000-1200 HV, and the wear resistance is 4-5 times higher than that of traditional steel. Although this technology significantly improves the hardness and wear resistance of the high-entropy alloy, the metal elements used are relatively expensive and are not suitable for large-scale industrial production.

[0005] Existing research on the wear resistance of AlCrFeNiTi-based high-entropy alloys (Ming-Hao Chuang, Ming-Hung Tsai, Woei-Ren Wang, Su-Jien Lin, Jien-Wei Yeh, Microstructure and wear behavior of AlxCo1.5CrFeNi1.5Tiy high-entropy alloys, Acta Materialia, Volume 59, Issue 16, 2011, Pages 6308-6317, ISSN 1359-6454, https: / / doi.org / 10.1016 / j.actamat.2011.06.041.) improves the wear resistance of the alloy by changing the molar ratio of Al and Ti elements. The hardness of the quaternary high-entropy alloy is 450-720 HV, and the wear resistance is 2-4 times higher than that of bearing steel and high-speed steel with the same hardness. There are certain limitations to the improvement of the hardness and wear resistance of high-entropy alloys.

[0006] There are many existing alloy types that can meet the actual production needs, but service conditions at too high temperatures have a very adverse impact on alloys. For example, when the temperature reaches 600 °C, the yield strength of most steels will decrease significantly compared to room temperature, and it also has an adverse effect on their toughness, thus affecting the final hardness and wear resistance of the alloy. The high-wear-resistant bulk high-entropy alloy with trace B elements provided by the present invention has the characteristics of high hardness and stability under high-temperature conditions. Under high-temperature service conditions, its hardness does not change significantly like that of NM500, so it has the advantage of maintaining high hardness and wear resistance in a thermal environment. Summary of the Invention

[0007] To solve the deficiencies of the prior art, the present invention provides a B-element microalloyed high-wear-resistant bulk high-entropy alloy, its preparation method and application.

[0008] The technical solution provided by the present invention is as follows:

[0009] A B-element microalloyed high-wear-resistant bulk high-entropy alloy, the chemical composition and the corresponding mass percentages are: Al: 10.70-10.82 wt%, Cr: 20.80-20.94 wt%, Ni: 35.40-35.56 wt%, Ti: 19.20-19.33 wt%, B: 0.10-0.25 wt%, and the rest is Fe and unavoidable impurities, and the chemical composition needs to simultaneously satisfy the following three relationships: (1) (52 < Fe / B < 138); (2) (1.2 < Fe / (B + Al) < 1.3); (3) (0.7 < Fe / (B + Ti) < 1.3), all are mass percentage ratios.

[0010] The high-entropy alloy provided by the above technical solution has obvious dendritic structure, uniform tissue distribution, high hardness and good wear resistance. Compared with the traditional wear-resistant material NM500, its wear resistance is improved by 3 to 5 times at the same hardness.

[0011] The present invention also provides a preparation method of the above-mentioned B element micro-alloyed high wear-resistant bulk high entropy alloy, comprising the following steps: according to the chemical composition and content of the high wear-resistant bulk high entropy alloy of the trace B element, the ingredients are prepared, and a vacuum arc furnace melting copper mold casting process is adopted to melt the alloy to obtain the B element micro-alloyed high wear-resistant bulk high entropy alloy.

[0012] Based on the above technical solution, a high-entropy alloy with obvious dendrite structure, uniform tissue distribution, high hardness and good wear resistance can be prepared.

[0013] Specifically, the raw materials are aluminum, chromium, iron, nickel, titanium, and boron particles with a purity of 99.99%. The raw materials are polished with sandpaper to remove surface oxides, ultrasonically cleaned in water and then in alcohol, and dried at 50-80°C for 0.5-2 hours before use. The pretreated metal particles are then weighed according to the required amount of each element to prepare the raw materials.

[0014] Specifically, the prepared raw materials are placed and smelted in an arrangement in which the high melting point elements are at the bottom and the low melting point elements are at the top.

[0015] Specifically, when metal is smelted, the smelting parameter setting value is: vacuum degree is 1.5~2.5×10 -3 Pa, fill with inert gas to -0.04~-0.06MPa; during smelting, the smelting current is 250A~700A.

[0016] Specifically, a vacuum arc furnace is used to melt and cast the copper mold, and the melting is repeated 1 to 3 times.

[0017] The present invention also provides a B element microalloyed high wear-resistant bulk high entropy alloy prepared according to the above preparation method.

[0018] The present invention also provides an application of the above-mentioned high-wear-resistant bulk high-entropy alloy for preparing high-wear-resistant cutting tools or molds, etc.

[0019] The present invention also provides another application of the above-mentioned high-wear-resistant bulk high-entropy alloy, which is used to prepare high-temperature wear-resistant materials used in the remanufacturing of mechanical products.

[0020] During the performance test, the cast high entropy alloy samples were subjected to the following tempering treatments:

[0021] 1) The sample of the present invention and the comparative sample NM500 were placed in a QRX1700 box-type atmosphere furnace, heated to 500-700°C, kept warm for 8-10 hours, and then air-cooled at room temperature;

[0022] 2) Place the sample and the comparative sample NM500 after the first heating and cooling in a QRX1700 box-type atmosphere furnace, heat to 900-1100°C, keep warm for 8-10 hours, and then air-cool at room temperature;

[0023] 3) Measure the hardness of the alloy after tempering and compare it with NM500.

[0024] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art:

[0025] 1) The hardness of the high entropy alloy prepared by the present invention reaches 700 HV, which is significantly improved compared with the hardness of the high entropy alloy system without adding B element, which is 600 HV.

[0026] 2) The high entropy alloy prepared by the present invention has more excellent wear resistance, which is 3 to 5 times higher than that of the high entropy alloy system without adding B element.

[0027] 3) In the process of preparing the alloy, group arc melting is adopted to prevent volatilization loss, the prepared alloy composition has small burn loss, and the prepared alloy composition is basically consistent with the configured composition.

[0028] 4) The five elements Al, Cr, Fe, Ni, and Ti have similar atomic radii. The hexavalent system formed by adding element B has a higher mixing entropy value, which reduces the Gibbs free energy of the system, promotes the formation of solid solution phase, inhibits the formation of compound phase, and improves the stability of high-entropy alloys.

[0029] 5) The atomic radius of the B atom is 25% of the average atomic radius of other atoms. Adding a trace amount of B element can form a large lattice distortion inside the alloy without affecting the stability of the alloy, prevent dislocation slip, significantly improve the solid solution strengthening effect of the alloy, and produce a high-entropy alloy material with greater hardness and wear resistance.

[0030] 6) The metal elements used in the present invention are all relatively low-priced metals, which are conducive to the realization of industrialized mass production.

[0031] 7) The characteristics of the elements themselves have a positive effect on improving the performance of the alloy:

[0032] Ti: Titanium is a high-melting-point element. Because it is located in the middle transition zone of the periodic table, it easily forms an interstitial solid solution structure with the alloy during the alloying process. Through solid solution strengthening, it can improve the alloy's overall mechanical properties to a certain extent. Furthermore, titanium refines the alloy's grain structure, and the resulting fine, dense structure has a positive effect on improving the alloy's strength and toughness. During wear, titanium easily oxidizes to form an oxide film, which acts as a lubricant and protector during friction, thereby reducing the alloy's wear rate.

[0033] Boron acts as a modifier in alloy systems, refining grain size, lowering melting point, and reducing expansion, thereby improving alloy strength, hardness, and wear resistance. Boron also has a purifying effect during the alloy melting process, significantly reducing the accumulation of impurity atoms at grain boundaries, narrowing grain boundary widths, and reducing the barrier effect of grain boundaries on dislocations, thereby improving the alloy's melting efficiency.

[0034] Cr: Chromium is the main element in common alloy systems that resists high-temperature oxidation. Due to its high melting point, it generates Cr2O3 or chromium-containing spinel structure during wear and heat generation, forming a dense and continuous oxide layer, blocking further contact between gas and alloy matrix, and improving the material's resistance to high-temperature oxidation. In addition, chromium is a strong carbide-forming element and can form a large amount of Cr 23 Carbides such as C6 effectively improve the alloy's wear resistance. A higher chromium content can enhance the alloy's hardenability, making it less susceptible to cracking under extreme operating conditions such as rapid cooling and heating, thereby extending its service life. Excessive chromium content increases production costs, so the chromium content of the present invention is 20.80-20.94 wt%, ensuring that the prepared high-entropy alloy has good practicality in alternating hot and cold working environments, including excellent high-temperature oxidation resistance and good wear resistance.

[0035] Nickel: Nickel is a hard, ductile, and ferromagnetic metal that is highly polishable and corrosion-resistant. Nickel is a ferrophile element and readily combines with iron in alloy systems, increasing the alloy's hardness. Nickel is insoluble in water and forms a dense oxide film on its surface in moist air at room temperature, preventing further oxidation of the base metal and improving the alloy's surface wear resistance.

[0036] Al: Aluminum itself has an FCC structure, but it is also an element that promotes the formation of BCC phase in high-entropy alloy systems. Adding an appropriate amount of Al makes the BCC phase structure of the alloy system account for a larger proportion, thereby improving the overall strength, hardness and wear resistance of the alloy. The Al element has a significant regulatory effect on the performance of dual-phase high-entropy alloys, promoting the formation of a dual-phase structure within the alloy that has better performance than a unidirectional structure. Al is a light metal element with an atomic radius of 0.143nm. The addition of Al can distort the original lattice structure, reduce the free energy of the system, and play a role in solid solution strengthening. At the same time, Al can also form a dense oxide film on the surface of the alloy, improving the alloy's resistance to high-temperature oxidation and wear resistance.

[0037] In summary, the low-cost B-element microalloyed high-wear-resistant bulk high-entropy alloy prepared by the present invention obtains a high-entropy alloy ingot with excellent hardness and wear resistance by rationally controlling the ratio of various elements and the content of B element. At the same time, the high-temperature stability exhibited by the high-entropy alloy enables it to have high-temperature performance retention characteristics compared to NM500. The low-cost B-element microalloyed high-wear-resistant bulk high-entropy alloy prepared by the present invention is suitable for occasions such as parts of reciprocating mechanical motion and cutting tools. The B-element microalloyed high-wear-resistant bulk high-entropy alloy prepared by the present invention has obvious dendritic structure and uniform microstructure distribution, high hardness and good wear resistance. Compared with the traditional wear-resistant material NM500, its wear resistance is improved by 3 to 5 times at the same hardness. After undergoing a two-step tempering heat treatment with the same parameters, the hardness of NM500 is reduced by 58.64 to 68.93% compared to its quenched and tempered state, and the hardness of the material of the present invention is reduced by 37.47 to 39.71% compared to its cast state, showing more excellent high-temperature stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a SEM image of the high entropy alloy material prepared in Example 1 of the present invention at a size 1000 times larger.

[0039] Figure 2 This is a 1000-fold SEM image of the high-entropy alloy material prepared in Example 2 of the present invention.

[0040] Figure 3 This is a 1000-fold SEM image of the high-entropy alloy material prepared in Example 3 of the present invention.

[0041] Figure 4 The SEM image is 1000 times larger than the high entropy alloy material without adding boron prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0042] 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.

[0043] Example 1

[0044] Preparation method of B element microalloyed high wear resistance bulk high entropy alloy

[0045] The preparation method described in this embodiment is as follows:

[0046] Using 99.99% pure aluminum, chromium, iron, nickel, titanium and boron elemental particles as raw materials, the raw material surface was first polished with sandpaper to remove surface oxides, and then ultrasonically cleaned in water and alcohol, and then dried at 80 ° C for 2h. The ingredients were prepared according to the following mass percentages: 10.7wt% Al, 20.8wt% Cr, 35.4wt% Ni, 19.2wt% Ti, 0.1wt% B, 13.8wt% Fe. A vacuum arc melting furnace was used for high-temperature melting. First, the elemental particles were mixed and placed in a water-cooled copper crucible in the arc melting furnace. Vacuum was first drawn. When the vacuum reached 2.0×10 -3 After the alloy is melted, the inert gas is filled to -0.05MPa. The arc current is 250A and the melting current is 350A. After the melting is completed, the ingot is turned over after rapid water cooling. After repeated melting three times, the superhard and wear-resistant high-entropy alloy ingot is obtained. After the melting is completed, the ingot is cooled in a water-cooled copper crucible to obtain the high-entropy alloy material ingot.

[0047] The prepared samples were subjected to a microhardness test (microhardness test was performed using an HV-1000 Vickers hardness tester). The hardness of the sample in Example 1 of the present invention can reach 683.66HV1.

[0048] The prepared samples were subjected to sliding friction and wear tests (Bruker, UMT3, USA wear tester) using stainless steel as the grinding material, a load of 30N, room temperature, and a wear time of 30 minutes. The alloy was worn in either rotational or reciprocating linear motion, with a rotational speed of 200 r / min and a reciprocating speed of 0.1 m / s. The wear resistance index (wear quality) of the high-entropy alloy material of the present invention was improved by 4.8 times compared to conventional wear-resistant steel NM500 and by 4 times compared to the comparative example without the addition of element B.

[0049] The prepared high-entropy alloy was tempered: 1) the sample of the present invention and the comparative sample NM500 were placed in a QRX1700 box-type atmosphere furnace, heated to 500°C, kept warm for 8 hours, and then air-cooled at room temperature; 2) the sample and the comparative sample NM500 after the first heating and cooling were placed in a QRX1700 box-type atmosphere furnace again, heated to 900°C, kept warm for 8 hours, and then air-cooled at room temperature; 3) the hardness of the high-entropy alloy of Example 1 after tempering was measured to be 559.97 HV1, and the hardness of NM500 after tempering under the same conditions was 219.23 HV1.

[0050] According to the tempering test results, the hardness of the high entropy alloy prepared in this embodiment is reduced by 18.09%, and that of NM500 is reduced by 58.64%. The hardness reduction ratio of the B microalloyed high entropy alloy is nearly 40% lower than that of NM500.

[0051] Example 2

[0052] Preparation method of B element microalloyed high wear resistance bulk high entropy alloy

[0053] The preparation method described in this embodiment is as follows:

[0054] Aluminum, chromium, iron, nickel, titanium and boron elemental particles with a purity of 99.99% are used as raw materials. The surface of the raw materials is first polished with sandpaper to remove surface oxides, and then ultrasonically cleaned in water and alcohol, and then dried at 80°C for 2h. The ingredients are prepared according to the following mass percentages: 10.82wt% Al, 20.94wt% Cr, 35.56wt% Ni, 19.33wt% Ti, 0.25wt% B, 13.1wt% Fe. A vacuum arc melting furnace is used for high-temperature melting. First, the elemental particles are mixed and placed in a water-cooled copper crucible in the arc melting furnace. Vacuum is first drawn. When the vacuum degree reaches 2.0×10 -3 After the alloy is melted, the inert gas is filled to -0.05MPa. The arc current is 250A and the melting current is 350A. After the melting is completed, the ingot is turned over after rapid water cooling. After repeated melting three times, the superhard and wear-resistant high-entropy alloy ingot is obtained. After the melting is completed, the ingot is cooled in a water-cooled copper crucible to obtain the high-entropy alloy material ingot.

[0055] The prepared samples were subjected to a microhardness test (microhardness test was performed using an HV-1000 Vickers hardness tester). The hardness of the sample of Example 2 of the present invention could reach 697.43 HV HV1.

[0056] The prepared samples were subjected to sliding friction and wear tests using stainless steel as the grinding material, a load of 30N, room temperature, and a wear time of 30 minutes. The alloy wear mode could be either rotational or reciprocating linear motion, with a rotation speed of 200 r / min and a reciprocating speed of 0.1 m / s. The wear resistance index (wear quality) of the high-entropy alloy material of the present invention was improved by 4.2 times compared to conventional wear-resistant steel NM500 and by 3.5 times compared to the comparative example without the addition of element B.

[0057] The prepared high-entropy alloy was tempered as follows: 1) the sample of the present invention and the comparative sample NM500 were placed in a QRX1700 box-type atmosphere furnace, heated to 600°C, kept warm for 9 hours, and then air-cooled at room temperature; 2) the sample and the comparative sample NM500 after the first heating and cooling were placed in a QRX1700 box-type atmosphere furnace again, heated to 1000°C, kept warm for 9 hours, and then air-cooled at room temperature; 3) the hardness of the high-entropy alloy of Example 2 after tempering was measured to be 586.92 HV1, and the hardness of NM500 after tempering under the same conditions was 201.29 HV1.

[0058] According to the tempering test results, the hardness of the high entropy alloy prepared in this embodiment is reduced by 15.85%, and that of NM500 is reduced by 62.02%. The hardness reduction ratio of the B microalloyed high entropy alloy is nearly 46% lower than that of NM500.

[0059] Example 3

[0060] Preparation method of B element microalloyed high wear resistance bulk high entropy alloy

[0061] The preparation method described in this embodiment is as follows:

[0062] Aluminum, chromium, iron, nickel, titanium and boron elemental particles with a purity of 99.99% are used as raw materials. The surface of the raw materials is first polished with sandpaper to remove surface oxides, and then ultrasonically cleaned in water and alcohol, and then dried at 80°C for 2h. The ingredients are prepared according to the following mass percentages: 10.76wt% Al, 20.87wt% Cr, 35.48wt% Ni, 19.26wt% Ti, 0.17wt% B, 13.46wt% Fe. A vacuum arc melting furnace is used for high-temperature melting. First, the elemental particles are mixed and placed in a water-cooled copper crucible in the arc melting furnace. Vacuum is first drawn. When the vacuum degree reaches 2.0×10 -3 After the alloy is melted, the inert gas is filled to -0.05MPa. The arc current is 250A and the melting current is 350A. After the melting is completed, the ingot is turned over after rapid water cooling. After repeated melting three times, the superhard and wear-resistant high-entropy alloy ingot is obtained. After the melting is completed, the ingot is cooled in a water-cooled copper crucible to obtain the high-entropy alloy material ingot.

[0063] The prepared samples were subjected to a microhardness test (microhardness test was performed using an HV-1000 Vickers hardness tester). The hardness of the sample of Example 3 of the present invention can reach 687.43HV1.

[0064] The prepared samples were subjected to sliding friction and wear tests using stainless steel as the grinding material, a load of 30N, room temperature, and a wear time of 30 minutes. The alloy wear mode could be either rotational or reciprocating linear motion, with a rotation speed of 200 r / min and a reciprocating speed of 0.1 m / s. The wear resistance index (wear quality) of the high-entropy alloy material of the present invention was 4.6 times higher than that of conventional wear-resistant steel NM500 and 3.8 times higher than that of the comparative example without the addition of element B.

[0065] The prepared high-entropy alloy was tempered as follows: 1) the sample of the present invention and the comparative sample NM500 were placed in a QRX1700 box-type atmosphere furnace, heated to 700°C, kept warm for 10 hours, and then air-cooled at room temperature; 2) the sample and the comparative sample NM500 after the first heating and cooling were placed in a QRX1700 box-type atmosphere furnace again, heated to 1100°C, kept warm for 10 hours, and then air-cooled at room temperature; 3) the hardness of the high-entropy alloy of Example 3 after tempering was measured to be 572.09 HV1, and the hardness of NM500 after tempering under the same conditions was 164.65 HV1.

[0066] According to the tempering test results, the hardness of the high entropy alloy prepared in this embodiment is reduced by 16.78%, and that of NM500 is reduced by 68.93%. The hardness reduction ratio of the B microalloyed high entropy alloy is nearly 50% lower than that of NM500.

[0067] Comparative Example

[0068] Preparation of high entropy alloys without B element

[0069] The preparation and testing methods were the same as in Examples 1 to 3, differing only in the mass percentages of the components: 10.76 wt% Al, 20.87 wt% Cr, 35.48 wt% Ni, 19.26 wt% Ti, 0 wt% B, and 13.63 wt% Fe. The comparative example sample achieved a hardness of 592.14 HV₁, and various properties were tested in the same manner as in the previous examples.

[0070] By comparison Figures 1 to 4 As can be seen, the B-microalloyed, high-wear-resistant bulk high-entropy alloy provided by the present invention significantly increases the dispersion of dendrites and achieves uniform microstructure distribution due to the addition of trace amounts of B. This improves the alloy's hardness and reduces alloy wear. The change in these values becomes more pronounced with increasing B content, further benefiting the alloy's wear resistance.

[0071] By comparing the hardness value, wear volume and hardness of the alloy after tempering, it can be seen that the hardness reduction of NM500 after high-temperature tempering is nearly 20% lower than that of the B element micro-alloyed high-entropy alloy. The high-entropy alloy of the present invention exhibits more excellent high-temperature stability.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A B element microalloyed high wear resistance bulk high entropy alloy, characterized in that: Its chemical composition and corresponding mass percentage are: Al: 10.70-10.82wt%, Cr: 20.80-20.94wt%, Ni: 35.40-35.56wt%, Ti: 19.20-19.33wt%, B: 0.10-0.25wt%, the remainder is Fe and unavoidable impurities, and the chemical composition must satisfy the following three relationships at the same time: (1)(52 <Fe / B<138);(2)(1.2<Fe / (B+Al)<1.3);(3)(0.7<Fe / (B+Ti)<1.3)。 2. A method for preparing the B element microalloyed high wear resistance bulk high entropy alloy according to claim 1, characterized in that: The following steps are involved: According to the chemical composition and content of the B element microalloyed high wear resistant bulk high entropy alloy, the B element microalloyed high wear resistant bulk high entropy alloy is smelted by adopting a vacuum arc furnace melting copper mold casting process to obtain the B element microalloyed high wear resistant bulk high entropy alloy.

3. The method for preparing the B element microalloyed high wear resistant bulk high entropy alloy according to claim 2, characterized in that: The raw materials are aluminum, chromium, iron, nickel, titanium and boron elemental particles with a purity of 99.99%.

4. The method for preparing the B element microalloyed high wear resistant bulk high entropy alloy according to claim 3, characterized in that: The prepared raw materials are placed and smelted in an arrangement with high melting point elements at the bottom and low melting point elements at the top.

5. The method for preparing the B element microalloyed high wear resistant bulk high entropy alloy according to claim 2, characterized in that: When metal is smelted, the smelting parameter setting value is: vacuum degree is 1.5~2.5×10 -3 Pa, and inert gas is injected to -0.04~-0.06MPa; the melting current during melting is 250A~700A.

6. The method for preparing a B-element microalloyed high-wear-resistant bulk high-entropy alloy according to any one of claims 2 to 5, characterized in that: The process of melting and pouring copper molds in a vacuum arc furnace is used for repeated melting, with the number of melting times being 1 to 3.

7. A use of the B element microalloyed high wear resistance bulk high entropy alloy according to claim 1, characterized in that: Used to prepare high temperature resistant and high wear resistant cutting tools or molds.

8. A use of the B element microalloyed high wear resistance bulk high entropy alloy according to claim 1, characterized in that: Used to prepare materials for remanufacturing of mechanical products.

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