Nb element reinforced multiphase high-entropy alloy with wear resistance and obdurability and preparation method thereof
By adding Nb elements to high-entropy alloys and using vacuum induction melting technology, a multiphase high-entropy alloy with both wear resistance and toughness is prepared, which solves the problem of mismatch between strength and toughness, achieves high hardness and improved wear resistance of the alloy, and is suitable for material surface engineering.
Patent Information
- Application Number
- CN202511204092.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2025-10-10
AI Technical Summary
Existing high-entropy alloys have a poor match between strength and toughness, making it difficult to simultaneously possess excellent wear resistance and toughness.
By adding the Nb element, a multiphase high-entropy alloy composed of Al, Cr, Co, Fe, Ni and Nb is prepared. Vacuum induction melting technology is used to control the impurities and composition during the melting process to form BCC and FCC phases and Nb intermetallic compound phases, thereby improving the wear resistance and toughness of the alloy.
It significantly improves the strength, toughness and wear resistance of the alloy, solves the problem of mismatch between strength and toughness, and has high hardness and excellent wear resistance, making it suitable for material surface engineering.
Smart Images
Figure CN120758779A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a multiphase high entropy alloy and a preparation method thereof, belonging to the technical field of alloy materials. Background Art
[0002] High-entropy alloys (HEAs) are alloys composed of five or more elements. They are a class of chemically disordered alloys whose components are generally located in the central region of the phase diagram and have a high mixing entropy. Therefore, they tend to form simple solid solutions such as FCC and BCC phases rather than complex intermetallic compound phases or other ordered phases. Their unique crystal structure enables HEAs to exhibit outstanding properties in a wide range of applications. These include excellent wear resistance, strong corrosion resistance, superior oxidation resistance, high hardness and strong ductility, and significant thermal stability. To some extent, the advancement of HEAs has effectively addressed the limitations of bulk amorphous alloys, such as room temperature brittleness and application limitations.
[0003] Vacuum induction melting (VIM) is a mature alloy material preparation technology. In a vacuum environment, induced current is used as a heating method to melt metal raw materials. This technology can effectively reduce the nitrogen, hydrogen, oxygen and carbon in the alloy. Excessively high temperatures during the melting process will volatilize impurity elements (Cu, Pd, Zn, etc.) in the material. The composition of active elements such as Al, Fe, Ni and Nb that need to be added to the alloy material is easy to control. Therefore, the metal material after vacuum induction melting can significantly improve the toughness, wear resistance and corrosion resistance.
[0004] Nb is a commonly used reinforcing element. Due to its large atomic size, it is very easy to cause lattice distortion and solid solution strengthening, which can effectively improve the strength and wear resistance of metals. Adding Nb to the material can change the microstructure of the alloy, such as refining the grains and forming an intermetallic compound phase, effectively preventing atomic diffusion and dislocation movement, thereby improving the strength and toughness of the material, and enhancing the wear resistance and corrosion resistance of the alloy. In view of the above, based on vacuum induction melting technology, a new method is provided for the preparation of high-entropy alloys with high strength, high toughness and excellent wear resistance by adding a certain amount of Nb. Summary of the Invention
[0005] In order to solve the problem of mismatch between strength and toughness of common high entropy alloys, the present invention proposes a Nb element-reinforced multiphase high entropy alloy having both wear resistance and toughness and a preparation method thereof.
[0006] The technical solution adopted by the present invention to solve the above problems is: the Nb element-reinforced multiphase high-entropy alloy with both wear resistance and toughness is composed of Al, Cr, Co, Fe, Ni and Nb elements, and the atomic molar ratio of Al, Cr, Co, Fe, Ni and Nb is 1:1:1:1:2.1:0.2~0.6.
[0007] The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to the present invention comprises the following steps: Step 1, Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles are used as raw materials, wherein the molar mass ratio of the Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles is 1:1:1:1:2.1:0.2-0.6; Step 2: The raw materials in step 1 are evenly stacked in a zirconia crucible in order of melting point from low to high and particles from small to large. The crucible is then placed in a graphite crucible and then in a quartz crucible. Finally, it is placed in the induction coil of the melting furnace and fixed. The furnace door of the melting furnace is closed and locked, and the vacuum pump pre-vacuum valve is opened. The vacuum is evacuated until the pressure in the melting furnace is less than 10 Pa. The vacuum valve is closed, and the valve of the argon cylinder is opened. Argon is filled into the melting furnace until the vacuum degree is 0.05-0.08 MPa. The water chiller is turned on to start the cooling circulation system. Step 3: Repeat step 2 for 2-3 times of vacuuming and filling with argon, then close the vacuum valve, turn off the mechanical pump, and complete the furnace cleaning to ensure that the melting process is carried out in a pure argon atmosphere; Step 4: Turn on the high-frequency heating power supply of the melting furnace to start heating. The electrode energizes the induction coil wrapped around the crucible to heat it. The melting temperature is controlled by adjusting the current control knob. The current is gradually increased to 40-46A for melting. When the temperature reaches 1600-1750°C, the metal particles melt. Keep the temperature for 30 minutes to ensure that the metal particles are completely melted to obtain molten metal. Step 5: After the insulation is completed, gradually reduce the current and lower the temperature in the furnace to 1200℃~1350℃. When the current drops to 30~36A, increase the current to 40~46A and repeat the melting; Step 6: Repeat the remelting process of step 5 4 to 6 times; Step 7: After the smelting is completed, turn off the current, turn off the heating power supply, keep the water cooler powered on, reduce the temperature in the furnace to room temperature, allow the metal in the crucible to fully cool, open the vent valve, open the smelting furnace door and take out the as-cast high-entropy alloy, completing the preparation of the Nb-enhanced multiphase high-entropy alloy with both wear resistance and toughness.
[0008] Furthermore, in step 1, the purity of the Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles is higher than 99%.
[0009] Furthermore, in step 1, the molar ratio x of the Nb element is 0.2, 0.4, and 0.6.
[0010] Furthermore, the crucible in step 2 is one of a zirconia crucible, a graphite crucible and a quartz crucible.
[0011] Furthermore, in step 4, the current is gradually increased to 43-46 A for smelting, and the temperature is raised to 1700° C. and kept at this temperature for 30 minutes.
[0012] Furthermore, in the process of gradually increasing the current in step 4, the current is adjusted by 1 A each time with an interval of 5 minutes.
[0013] Furthermore, in step 5, when the current drops to 34-36 A, the current is increased again to 43-46 A.
[0014] Furthermore, in the process of gradually reducing the current in step 5, the current is adjusted by 1 A each time with an interval of 5 minutes; in the process of increasing the current, the current is adjusted by 1 A each time with an interval of 5 minutes.
[0015] The beneficial effects of the present invention are: 1. The present invention provides a method for preparing Nb-enhanced multiphase high-entropy alloys using vacuum induction melting technology, which realizes the combination of vacuum induction melting technology and multiphase high-entropy alloy materials, overcomes the problems of excessive impurities and uneven composition in traditional processes, significantly improves the toughness, fatigue strength, corrosion resistance, high-temperature creep performance and other properties of multiphase high-entropy alloys, and promotes the widespread application of high-entropy alloys in material surface engineering.
[0016] 2. AlCrCoFeNb of the present invention x Ni 2.1 Multiphase high entropy alloys not only have a dual-phase multiphase structure of BCC and FCC, but also contain Nb intermetallic compound phases. They have the advantages of high strength and high toughness, which not only solves the problem of machining but also provides excellent hardness and wear resistance.
[0017] 3、The Nb element enhanced multiphase high-entropy alloy prepared by the method has significantly improved strength, toughness and wear resistance of the alloy. The addition of the Nb element refines the grain size of the coating, and the grain refinement increases the grain boundary density, hinders the movement of dislocations, and improves the hardness of the alloy. The addition of the Nb element causes the precipitation of intermetallic compound phases in the BCC phase, and the intermetallic compound phases have extremely high hardness, and the second phase hinders the movement of dislocations, can significantly inhibit the generation and expansion of cracks caused by dislocation movement, thereby improving the plasticity and crack resistance of the alloy material. Therefore, the addition of an appropriate amount of Nb element in the multiphase high-entropy alloy can effectively improve the plasticity and hardness of the alloy material, and the improvement of the hardness can improve the wear resistance of the alloy to a certain extent.
[0018] 4、The preparation method disclosed by the application has simple process, and various elements can be used to enhance the performance of the alloy material. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 (a) is an AlCrCoFeNb x Ni 2.1 high-entropy alloy prepared by the example; Figure 1 (b) is a schematic diagram of the corresponding fraction of each phase calculated by XRD; Figure 2 is an AlCrCoFeNb x Ni 2.1 high-entropy alloy microstructure morphology prepared by the example; Figure 2 a is an AlCrCoFeNb 2.1 high-entropy alloy schematic diagram; Figure 2 b is an AlCrCoFeNb 0.2 Ni 2.1 high-entropy alloy schematic diagram; Figure 2 c is an AlCrCoFeNb 0.4 Ni 2.1 high-entropy alloy schematic diagram; Figure 2 d is an AlCrCoFeNb 0.6 Ni 2.1 high-entropy alloy schematic diagram; Figure 3 is a microhardness column diagram of an AlCrCoFeNb x Ni 2.1 high-entropy alloy prepared by the example; Figure 4 is an AlCrCoFeNb x Ni 2.1Indentation crack morphology of high entropy alloy; Figure 4 a is AlCrCoFeNi 2.1 Schematic diagram of high entropy alloy; Figure 4 b is AlCrCoFeNb 0.2 Ni 2.1 Schematic diagram of high entropy alloy; Figure 4 c is AlCrCoFeNb 0.4 Ni 2.1 Schematic diagram of high entropy alloy; Figure 4 d is AlCrCoFeNb 0.6 Ni 2.1 Schematic diagram of high entropy alloy; Figure 5 The AlCrCoFeNb prepared in Example x Ni 2.1 Plot of the wear rate and average friction coefficient of high entropy alloys. DETAILED DESCRIPTION
[0020] Specific embodiment 1: A Nb element-reinforced multiphase high-entropy alloy with both wear resistance and toughness, composed of Al, Cr, Co, Fe, Ni and Nb elements, with the atomic molar ratio of Al, Cr, Co, Fe, Ni and Nb being 1:1:1:1:2.1:0.2~0.6.
[0021] Specific embodiment 2: A method for preparing a Nb element-reinforced multiphase high-entropy alloy with both wear resistance and toughness, the specific steps comprising: Step 1, Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles are used as raw materials, wherein the molar mass ratio of the Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles is 1:1:1:1:2.1:0.2-0.6; The purity of Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles is higher than 99%; The molar ratio x of Nb element is 0.2, 0.4, and 0.6; Step 2: The raw materials in step 1 are evenly stacked in a zirconia crucible in order of melting point from low to high and particles from small to large. The crucible is then placed in a graphite crucible and then in a quartz crucible. Finally, it is placed in the induction coil of the melting furnace and fixed. The furnace door of the melting furnace is closed and locked, and the vacuum pump pre-vacuum valve is opened. The vacuum is evacuated until the pressure in the melting furnace is less than 10 Pa. The vacuum valve is closed, and the valve of the argon cylinder is opened. Argon is filled into the melting furnace until the vacuum degree is 0.05-0.08 MPa. The water chiller is turned on to start the cooling circulation system. The crucible is one of zirconia crucible, graphite crucible and quartz crucible; Step 3: Repeat step 2 for 2-3 times of vacuuming and filling with argon, then close the vacuum valve, turn off the mechanical pump, and complete the furnace cleaning to ensure that the melting process is carried out in a pure argon atmosphere; Step 4: Turn on the high-frequency heating power supply of the melting furnace to start heating. The electrode energizes the induction coil wrapped around the crucible to heat it. The melting temperature is controlled by adjusting the current control knob. The current is gradually increased to 40-46A for melting. When the temperature reaches 1600-1750°C, the metal particles melt. Keep the temperature for 30 minutes to ensure that the metal particles are completely melted to obtain molten metal. Gradually increase the current to 43~46A for smelting, raise the temperature to 1700℃, and keep it warm for 30 minutes; In the process of gradually increasing the current, adjust the current by 1A each time with an interval of 5 minutes; Step 5: After the insulation is completed, gradually reduce the current and lower the temperature in the furnace to 1200℃~1350℃. When the current drops to 30~36A, increase the current to 40~46A and repeat the melting; When the current drops to 34~36A, increase the current to 43~46A again; In the process of gradually reducing the current, adjust the current by 1A each time with an interval of 5 minutes; in the process of increasing the current, adjust the current by 1A each time with an interval of 5 minutes; Step 6: Repeat the remelting process of step 5 4 to 6 times; Step 7: After the smelting is completed, turn off the current, turn off the heating power supply, keep the water cooler powered on, reduce the temperature in the furnace to room temperature, allow the metal in the crucible to fully cool, open the vent valve, open the smelting furnace door and take out the as-cast high-entropy alloy, completing the preparation of the Nb-enhanced multiphase high-entropy alloy with both wear resistance and toughness.
[0022] Example Example 1: The AlCrCoFeNb reinforced by Nb element in this embodiment has both wear resistance and toughness. 0.2 Ni 2.1 The preparation method of high entropy alloy is implemented according to the following steps: Step 1: Weigh 16% Al, 16% Cr, 16% Co, 16% Fe, 33% Ni and 3% Nb (elemental) metal particles as raw materials according to atomic percentage; Step 2: The raw materials in step 1 are evenly stacked in a zirconia crucible in order of melting point from low to high and particles from small to large, and then placed in a graphite crucible, and then placed in a quartz crucible. Finally, the crucible is sent into the induction coil of a VIF vacuum induction melting furnace and fixed. The furnace cover of the melting furnace is closed and locked, the vacuum pump pre-vacuum valve is opened, and the furnace pressure is evacuated until it is less than 10Pa. The vacuum valve is closed, the argon cylinder valve is opened, and the melting furnace is filled with argon until the pressure reaches 0.75 atmospheres. The water cooler is turned on to start the cooling circulation system. Step 3: Repeat step 2 to evacuate and fill with argon three times, then close the argon filling valve and the mechanical pump to complete the furnace cleaning; Step 4: Turn on the high-frequency heating power supply of the melting furnace to start heating. The rotating electrode is heated by the coil wrapped around the crucible. By adjusting the current control knob, the initial current is 12A, and the current is gradually increased to 42A for melting. The current is adjusted by 1A each time, and the interval between each current adjustment is 5 minutes. When the temperature reaches 1650℃, it is kept at this temperature for 30 minutes to obtain molten metal; Step 5: After the insulation is completed, gradually reduce the current and lower the temperature in the furnace to 1250℃. When the current drops to 32A, increase the current to 42A for variable temperature melting. Adjust the current by 1A each time, and the interval time is 5 minutes. Step 6: Repeat the temperature-variable melting process of step 5 6 times; Step 7: After the smelting is completed, turn off the current, turn off the heating power supply, keep the water cooler powered on, discharge the heat in the furnace, allow the metal in the crucible to cool naturally, open the vent valve, open the smelting furnace cover and take out the high-entropy alloy ingot, completing the preparation of the high-temperature oxidation-resistant duplex high-entropy alloy.
[0023] After the smelting is completed, the cylindrical alloy ingot is cooled and the surface oxide layer is removed by a wire cutting machine, and then the ingot is cut into AlCrCoFeNi alloys with a radius of about 40 mm and a thickness of about 25 mm. 2.1 High entropy alloy block.
[0024] Example 2: The AlCrCoFeNb reinforced by Nb element in this embodiment has both wear resistance and toughness. 0.4 Ni 2.1 The preparation method of high entropy alloy is implemented according to the following steps: Step one, 15% of Al, 15% of Cr, 15% of Co, 15% of Fe, 33% of Ni and 7% of Nb (elemental) metal particles are weighed as raw materials according to atomic percentage; Step two, the same as step two of example 1; Step three, the same as step three of example 1; Step four, turn on the high-frequency heating power of the smelting furnace to start heating, the rotating electrode is heated by the coil wound around the crucible, and the initial current is 12A. Gradually increase the current to 44A for smelting, and when the temperature reaches 1700℃, keep the temperature at this temperature for 30 minutes to obtain molten metal; Step five, after the heat preservation is over, gradually reduce the current to reduce the temperature in the furnace to 1300℃, and when the current is reduced to 34A, increase the current to 44A for temperature changing smelting, and adjust the current by 1A each time with an interval of 5 minutes; Step six, the same as step six of example 1; Step seven, the same as step seven of example 1.
[0025] Example 3: In this embodiment, the AlCrCoFeNb alloy has wear resistance and high strength and toughness. 0.6 Ni 2.1 The preparation method of the high-entropy alloy is implemented according to the following steps: Step one, 15% of Al, 15% of Cr, 15% of Co, 15% of Fe, 31% of Ni and 9% of Nb (elemental) metal particles are weighed as raw materials according to atomic percentage; Step two, the same as step two of example 1; Step three, the same as step three of example 1; Step four, turn on the high-frequency heating power of the smelting furnace to start heating, the rotating electrode is heated by the coil wound around the crucible, and the initial current is 12A. Gradually increase the current to 46A for smelting, and when the temperature reaches 1750℃, keep the temperature at this temperature for 30 minutes to obtain molten metal; Step five, after the heat preservation is over, gradually reduce the current to reduce the temperature in the furnace to 1350℃, and when the current is reduced to 36A, increase the current to 46A for temperature changing smelting, and adjust the current by 1A each time with an interval of 5 minutes; Step six, the same as step six of example 1; Step seven, the same as step seven of example 1.
[0026] Example 4: In this embodiment, the AlCrCoFeNi alloy has wear resistance and high strength and toughness. 2.1 The preparation method of the high-entropy alloy is implemented according to the following steps: Step 1: weighing 16% Al, 16% Cr, 16% Co, 16% Fe and 36% Ni (elemental) metal particles according to atomic percentage as raw materials; Step 2 is the same as step 2 in Example 1; Step 3 is the same as step 3 in Example 1; Step 4: Turn on the high-frequency heating power supply of the melting furnace to start heating. The rotating electrode heats the crucible through the coil wrapped around it. Adjust the current control knob. The initial current is 12A and gradually increase the current to 40A for melting. When the temperature reaches 1600°C, keep it at this temperature for 30 minutes to obtain molten metal. Step 5: After the insulation is completed, gradually reduce the current and lower the temperature in the furnace to 1200℃. When the current drops to 30A, increase the current to 40A for variable temperature melting. Adjust the current by 1A each time, and the interval time is 5 minutes. Step 6: Same as step 6 in Example 1; Step 7 is the same as step 7 in Example 1.
[0027] The high entropy alloy sample was subjected to XRD phase analysis using a Rigaku Smartlab SE X-ray diffractometer. Figure 1 As shown in Figure 3, it can be seen that the high entropy alloy enhanced by Nb element has not only FCC phase and BCC phase, but also Nb-containing intermetallic compound phase.
[0028] The wear-resistant microstructure of the Nb-enhanced multiphase high entropy alloy prepared in the embodiment was tested using an Apreo S Hivac field emission scanning electron microscope. Figure 2 shown.
[0029] Figure 3 The microhardness histogram of the prepared Nb element enhanced multiphase high entropy alloy shows that after adding Nb element, the microhardness of the alloy is significantly improved, and increases with the increase of Nb element content. 0.6 Ni 2.1 The microhardness of high entropy alloy reaches 582.68HV, which is the highest among AlCrCoFeNi alloys. 2.1 2.1 times that of high entropy alloys.
[0030] Figure 4 This is the indentation crack morphology of each phase of the Nb element enhanced multiphase high entropy alloy. The crack length and propagation mode generated during the application of force can be used to evaluate the crack propagation toughness of each phase of the high entropy alloy, thereby evaluating the toughness of the high entropy alloy as a whole. AlCrCoFeNb 0.4 Ni 2.1When the FCC phase in the high entropy alloy is subjected to external stress generated by plastic deformation, no obvious cracks are generated. When x=0.2, the indentation of the FCC phase undergoes plastic deformation, and the cracks extend along the diagonal direction of the indentation. However, excessive Nb content will lead to an increase in the intermetallic compound phase, making it very easy to crack when subjected to external pressure, reducing the compressive strength and plasticity of the alloy. AlCrCoFeNb 0.4 Ni 2.1 High entropy alloys have relatively balanced strength and toughness.
[0031] Figure 5 This is a graph of wear rate and average friction coefficient of Nb-enhanced multiphase high entropy alloy. 2.1 High entropy alloy, AlCrCoFeNb 0.6 Ni 2.1 The wear rate of high entropy alloy was reduced by 86%, and the wear resistance of high entropy alloy was effectively improved when x=0.4 and 0.6.
[0032] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.
Claims
1. A Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness, characterized in that: The Nb-reinforced multiphase high-entropy alloy with both wear resistance and toughness is composed of Al, Cr, Co, Fe, Ni and Nb elements, and the atomic molar ratio of Al, Cr, Co, Fe, Ni and Nb is 1:1:1:1:2.1:0.2-0.
6.
2. A method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness, characterized in that: The method for preparing a Nb element-reinforced multiphase high-entropy alloy having both wear resistance and toughness is achieved by the following steps: Step 1, Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles are used as raw materials, wherein the molar mass ratio of the Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles is 1:1:1:1:2.1:0.2-0.6; Step 2: The raw materials in step 1 are evenly stacked in a zirconia crucible in order of melting point from low to high and particles from small to large. The crucible is then placed in a graphite crucible and then in a quartz crucible. Finally, it is placed in the induction coil of the melting furnace and fixed. The furnace door of the melting furnace is closed and locked, and the vacuum pump pre-vacuum valve is opened. The vacuum is evacuated until the pressure in the melting furnace is less than 10 Pa. The vacuum valve is closed, and the valve of the argon cylinder is opened. Argon is filled into the melting furnace until the vacuum degree is 0.05-0.08 MPa. The water chiller is turned on to start the cooling circulation system. Step 3: Repeat step 2 for 2-3 times of vacuuming and filling with argon, then close the vacuum valve, turn off the mechanical pump, and complete the furnace cleaning to ensure that the melting process is carried out in a pure argon atmosphere; Step 4: Turn on the high-frequency heating power supply of the melting furnace to start heating. The electrode energizes the induction coil wrapped around the crucible to heat it. The melting temperature is controlled by adjusting the current control knob. The current is gradually increased to 40-46A for melting. When the temperature reaches 1600-1750°C, the metal particles melt. Keep the temperature for 30 minutes to ensure that the metal particles are completely melted to obtain molten metal. Step 5: After the insulation is completed, gradually reduce the current and lower the temperature in the furnace to 1200℃~1350℃. When the current drops to 30~36A, increase the current to 40~46A and repeat the melting; Step 6: Repeat the remelting process of step 5 4 to 6 times; Step 7: After the smelting is completed, turn off the current, turn off the heating power supply, keep the water cooler powered on, reduce the temperature in the furnace to room temperature, allow the metal in the crucible to fully cool, open the vent valve, open the smelting furnace door and take out the as-cast high-entropy alloy, completing the preparation of the Nb-enhanced multiphase high-entropy alloy with both wear resistance and toughness.
3. The method for preparing a Nb element-reinforced multiphase high-entropy alloy having both wear resistance and toughness according to claim 2, characterized in that: In step 1, the purity of the Al metal particles, Cr metal particles, Co metal particles, Fe metal particles, Ni metal particles and Nb metal particles is higher than 99%.
4. The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to claim 2, characterized in that: The molar ratio x of the Nb element in step 1 is 0.2, 0.4, and 0.
6.
5. The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to claim 2, characterized in that: The crucible in step 2 is one of a zirconia crucible, a graphite crucible and a quartz crucible.
6. The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to claim 2, characterized in that: In step 4, gradually increase the current to 43~46A for smelting, raise the temperature to 1700℃, and keep it warm for 30 minutes.
7. The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to claim 2, characterized in that: In the process of gradually increasing the current in step 4, adjust the current by 1A each time with an interval of 5 minutes.
8. The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to claim 2, characterized in that: In step 5, when the current drops to 34-36A, increase the current to 43-46A again.
9. The method for preparing a Nb-enhanced multiphase high-entropy alloy having both wear resistance and toughness according to claim 1, characterized in that: In step 5, the current is gradually reduced by 1 A each time, with an interval of 5 minutes; and the current is increased by 1 A each time, with an interval of 5 minutes.