High-strength Ni-Co-Cr-Mo series high-entropy alloy and preparation method thereof

Abstract

The invention relates to the technical field of high-entropy alloys, in particular to a high-strength Ni-Co-Cr-Mo series high-entropy alloy and a preparation method thereof.The alloy comprises the chemical components of nickel, cobalt, chromium and molybdenum, and the atomic ratio of the chemical components is as follows: 35%-40% of nickel, 25%-40% of cobalt, 15%-30% of chromium and 5%-10% of molybdenum; the atomic ratios of nickel, cobalt, chromium and molybdenum in the high-entropy alloy are 37.6%, 28.2%, 28.2% and 6% respectively; the atomic ratios of nickel, cobalt, chromium and molybdenum in the high-entropy alloy are 35.51%, 35.37%, 22.91% and 6.21% respectively; the high-entropy alloy is excellent in strength; the preparation process is easy to operate and low in cost, and the prepared high-entropy alloy has the advantages of being small in impurity amount and uniform in component; the rolling assembly is adopted, and rod-shaped materials with different section diameters can be rolled, so that the rolling range is widened, and the rolling effect of the rod-shaped materials is improved; and the feeding assembly is adopted, the rod-shaped materials can be automatically clamped, then the rod-shaped materials are automatically pushed, automatic rolling of the materials is improved, and the using effect of the equipment is improved.

Description

Technical Field

[0001] This invention relates to the field of high-entropy alloy technology, and in particular to a high-strength Ni-Co-Cr-Mo high-entropy alloy and its preparation method. Background Technology

[0002] High-entropy alloys, also known as multi-principal-element alloys, are a new type of alloy system that typically contains 3 to 5 elements with equal or nearly equal atomic ratios in each element compared to traditional alloys. This alloy design framework enables the alloy to exhibit superior properties that are different from traditional alloys, such as excellent mechanical properties, good corrosion resistance, and radiation resistance. However, early high-entropy alloy designs often lacked sufficient strength, limiting their applications. Summary of the Invention

[0003] The problem solved by this invention is to provide a high-strength Ni-Co-Cr-Mo high-entropy alloy and its preparation method. The high-entropy alloy exhibits excellent strength; moreover, the preparation process is simple and inexpensive, and the prepared high-entropy alloy has the advantages of low impurity content and uniform composition.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a high-strength Ni-Co-Cr-Mo high-entropy alloy and its preparation method, wherein the chemical composition of the alloy includes nickel, cobalt, chromium and molybdenum, and the atomic ratios of each chemical component are: nickel 35~40%, cobalt 25~40%, chromium 15~30%, and molybdenum 5~10%.

[0005] Preferably, the atomic ratios of nickel, cobalt, chromium, and molybdenum in the high-entropy alloy are 37.6%, 28.2%, 28.2%, and 6%, respectively.

[0006] Preferably, the atomic ratios of nickel, cobalt, chromium, and molybdenum in the high-entropy alloy are 35.51%, 35.37%, 22.91%, and 6.21%, respectively.

[0007] Preferably, the atomic ratios of nickel, cobalt, chromium, and molybdenum in the high-entropy alloy are 37.6%, 32.9%, 23.5%, and 6%, respectively.

[0008] A preferred method for preparing a high-strength Ni-Co-Cr-Mo high-entropy alloy includes the following steps: Step 1, arc melting; Step 2, material casting; Step 3, homogenization treatment; Step 4, rolling. In step one, bulk Ni-Co-Cr-Mo high-entropy alloys are prepared by vacuum arc melting. The raw materials are 99.99% high-purity elemental nickel, cobalt, chromium and molybdenum. The vacuum pressure is 10-4 Pa and the melting current is 200 A. To ensure uniform mixing of the metal raw materials, the arc melting is repeated more than 5 times. In step two, the molten material is poured into the mold and then air-cooled to cast the material into a rod shape. In step three, the material after suction casting is sealed in a vacuum environment and heated to 1250°C for 24 hours for high-temperature homogenization treatment to eliminate component segregation. In step four, the homogenized material is rolled by a rolling mill at a speed of 300 r / min and a rolling ratio of 80%.

[0009] Preferably, in step four, the rolling mill includes a rolling mill body, a processing trough, a rolling assembly, a feeding assembly, and position sensors. A processing trough is provided on one side of the rolling mill body. A rolling assembly is installed on the inner wall of one side of the processing trough. A feeding assembly is installed on the inner wall of one side of the processing trough. Position sensors are symmetrically installed on the inner wall of one side of the processing trough.

[0010] Preferably, the rolling assembly includes a first motor, a first gear, a first lead screw, a second gear, a lifting frame, a first connecting plate, a first threaded hole, a second motor, and a rolling roll. A lifting frame is symmetrically installed on one inner wall of the processing tank. A rolling roll is rotatably connected to one inner wall of the lifting frame. A second motor is embedded in the other inner wall of the lifting frame, and one end of the output shaft of the second motor is fixedly connected to the outer wall of the rolling roll. First connecting plates are welded to both outer walls of the lifting frame. First lead screws are distributed and welded to both inner walls of the processing tank. A first threaded hole is opened on one side of the first connecting plate corresponding to the position of the first lead screw. A second gear is fixedly connected to one outer wall of the first lead screw. First gears are meshed on one outer wall of each of the two second gears. A first motor is embedded in both inner walls of the processing tank, and one end of the output shaft of the first motor is fixedly connected to the outer wall of the first gear.

[0011] Preferably, the feeding assembly includes a chute, a third motor, a second lead screw, a sliding plate, a second threaded hole, a push plate, a second connecting plate, a telescopic rod, a spring, and a clamping plate. A second connecting plate is welded to one outer wall of the lifting frame. A telescopic rod is embedded in one inner wall of the second connecting plate. A clamping plate is fixedly connected to one outer wall of the telescopic rod. A spring is fixedly connected to one side of the clamping plate, and the other end of the spring is fixedly connected to the outer wall of the second connecting plate. A push plate is installed on one side of the clamping plate. A sliding plate is welded to the bottom outer wall of the push plate. A chute is formed on the bottom inner wall of the processing tank corresponding to the position of the sliding plate. A second lead screw is rotatably connected to one inner wall of the chute. A second threaded hole is formed on one side of the sliding plate corresponding to the position of the second lead screw. A third motor is embedded in the other inner wall of the chute, and one end of the output shaft of the third motor is fixedly connected to the outer wall of the second lead screw.

[0012] Preferably, the first gear and the second gear are bevel gears, and one side of the first gear and the second gear are perpendicular to each other.

[0013] Preferably, the spring is sleeved on the outer wall of the telescopic rod, and one side of the position sensor is mounted on the outer wall of the clamping plate.

[0014] The beneficial effects of this invention are: the high-entropy alloy exhibits excellent strength; and the preparation process is simple and inexpensive, with the high-entropy alloy having the advantages of low impurity content and uniform composition. The use of rolling components allows for the rolling of rod-shaped materials with different cross-sectional diameters, thereby increasing the rolling range and improving the rolling effect of rod-shaped materials; The feeding assembly automatically clamps and pushes the rod-shaped material, improving the automatic rolling process and enhancing the equipment's performance. Attached Figure Description

[0015] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the main body of the rolling mill of the present invention; Figure 3 This is a three-dimensional structural diagram of the internal structure of the rolling mill body of the present invention; Figure 4 This is a front sectional view of the main body of the rolling mill of the present invention; Figure 5 This is a comparison diagram of the stress and strain curves of the material of this invention and the comparative experimental group. Figure 6 This is a hardness comparison chart between the material of this invention and the material of the comparative experimental group.

[0016] Legend: 1. Rolling mill body; 2. Processing trough; 3. Rolling assembly; 4. Feeding assembly; 5. Position sensor; 301. First motor; 302. First gear; 303. First lead screw; 304. Second gear; 305. Lifting frame; 306. First connecting plate; 307. First threaded hole; 308. Second motor; 309. Rolling roll; 401. Slide groove; 402. Third motor; 403. Second lead screw; 404. Slide plate; 405. Second threaded hole; 406. Push plate; 407. Second connecting plate; 408. Telescopic rod; 409. Spring; 4010. Clamping plate. Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0018] A high-strength Ni-Co-Cr-Mo high-entropy alloy is disclosed. The alloy's chemical composition includes nickel, cobalt, chromium, and molybdenum, with the following atomic ratios: nickel 37.6%, cobalt 28.2%, chromium 28.2%, and molybdenum 6%.

[0019] Comparative Example 2 The alloy's chemical composition includes nickel, cobalt, chromium, and molybdenum, with the following atomic ratios: nickel 35.51%, cobalt 35.37%, chromium 22.91%, and molybdenum 6.21%.

[0020] Comparative Example 3 The alloy's chemical composition includes nickel, cobalt, chromium, and molybdenum, with the following atomic ratios: nickel 37.6%, cobalt 32.9%, chromium 23.5%, and molybdenum 6%.

[0021] according to Figures 5-6 Comparison of alloy parameters: High-entropy alloys exhibit excellent strength and are simple and inexpensive to prepare. The prepared high-entropy alloys have the advantages of low impurity content and uniform composition. Example 4

[0022] See Figure 1 A method for preparing a high-strength Ni-Co-Cr-Mo high-entropy alloy includes the following steps: Step 1, arc melting; Step 2, material casting; Step 3, homogenization treatment; Step 4, rolling. In step one, bulk Ni-Co-Cr-Mo high-entropy alloys are prepared by vacuum arc melting. The raw materials are 99.99% high-purity elemental nickel, cobalt, chromium and molybdenum. The vacuum pressure is 10-4 Pa and the melting current is 200 A. To ensure uniform mixing of the metal raw materials, the arc melting is repeated more than 5 times. In step two, the molten material is poured into the mold and then air-cooled to cast the material into a rod shape. In step three, the material after suction casting is sealed in a vacuum environment and heated to 1250°C for 24 hours for high-temperature homogenization treatment to eliminate component segregation. In step four, the homogenized material is rolled by a rolling mill at a speed of 300 r / min and a rolling ratio of 80%. Example 5

[0023] See Figures 2-4 In step four, the rolling mill includes a rolling mill body 1, a processing trough 2, a rolling assembly 3, a feeding assembly 4, a position sensor 5, a first motor 301, a first gear 302, a first lead screw 303, a second gear 304, a lifting frame 305, a first connecting plate 306, a first threaded hole 307, a second motor 308, a rolling roll 309, a chute 401, a third motor 402, a second lead screw 403, a sliding plate 404, a second threaded hole 405, a push plate 406, a second connecting plate 407, a telescopic rod 408, a spring 409, and a clamping plate 4010. A processing trough 2 is provided on one side of the rolling mill body 1. A rolling assembly 3 is installed on the inner wall of one side of the processing trough 2. A feeding assembly 4 is installed on the inner wall of one side of the processing trough 2. Position sensors 5 are symmetrically installed on the inner wall of one side of the processing trough 2. The rolling assembly 3 includes a first motor 301, a first gear 302, a first lead screw 303, a second gear 304, a lifting frame 305, a first connecting plate 306, a first threaded hole 307, a second motor 308, and a rolling roll 309. The lifting frame 305 is symmetrically installed on one inner wall of the processing tank 2. The rolling roll 309 is rotatably connected to one inner wall of the lifting frame 305. The second motor 308 is embedded in the other inner wall of the lifting frame 305, and one end of the output shaft of the second motor 308 is fixed to the outer wall of the rolling roll 309. The first connecting plate 306 is welded to both outer walls of the lifting frame 305. The first lead screw 303 is distributed and welded to both inner walls of the processing tank 2. A first threaded hole 307 is provided on one side of the first lead screw 303. A second gear 304 is fixedly connected to the outer wall of one end of the first lead screw 303. A first gear 302 is meshed on the outer wall of one side of the two second gears 304. A first motor 301 is embedded in the inner wall of both sides of the processing groove 2, and one end of the output shaft of the first motor 301 is fixed to the outer wall of the first gear 302. The first gear 302 and the second gear 304 are bevel gears, and one side of the first gear 302 and the second gear 304 are perpendicular to each other. The first motor 301 is started to make the first gear 302 rotate, and then the first lead screw 303 is rotated by the action of the second gear 304.

[0024] Working principle: First, the cast rod-shaped material is placed on the clamping plate 4010 and the push plate 406. The second motor 308 is started to rotate the rolling roller 309. Then, the first motor 301 is started to rotate the first gear 302. Then, under the action of the second gear 304, the first lead screw 303 rotates. Then, under the action of the first threaded hole 307, the lifting frame 305 on the first connecting plate 306 is adjusted in position, which in turn drives the second connecting plate 407 to adjust in position. This causes the clamping plate 4010 on the telescopic rod 408 to compress the rod-shaped material. The external force of spring 409 clamps the rod-shaped material through clamping plate 4010. The end diameter of the rod-shaped material is measured by position sensor 5. Then, the third motor 402 is started to rotate the second lead screw 403. Under the action of the second threaded hole 405, the slide plate 404 on the push plate 406 slides along the slide groove 401, thereby pushing the rod-shaped material between the rolling rolls 309 through the push plate 406. The rolling rolls 309 roll the rod-shaped material multiple times, which can roll rod-shaped materials with different cross-sectional diameters, thereby increasing the rolling range and improving the rolling effect of the rod-shaped material. Example 6

[0025] See Figures 3-4 The feeding assembly 4 includes a chute 401, a third motor 402, a second lead screw 403, a slide plate 404, a second threaded hole 405, a push plate 406, a second connecting plate 407, a telescopic rod 408, a spring 409, and a clamping plate 4010. A second connecting plate 407 is welded to one outer wall of the lifting frame 305. A telescopic rod 408 is embedded in one inner wall of the second connecting plate 407. A clamping plate 4010 is fixedly connected to one outer wall of the telescopic rod 408. A spring 409 is fixedly connected to one side of the clamping plate 4010, and the other end of the spring 409 is fixedly connected to the outer wall of the second connecting plate 407. A push plate 406 is installed on one side of the clamping plate 4010. A slide plate 404 is welded to the bottom outer wall of the push plate 406. 04. A groove 401 is provided on the inner wall of the bottom end of the processing tank 2, corresponding to the position of the slide plate 404. A second lead screw 403 is rotatably connected to one side of the inner wall of the groove 401. A second threaded hole 405 is provided on one side of the slide plate 404, corresponding to the position of the second lead screw 403. A third motor 402 is embedded in the inner wall of the other side of the groove 401, and one end of the output shaft of the third motor 402 is fixed to the outer wall of the second lead screw 403. A spring 409 is sleeved on the outer wall of the telescopic rod 408. One side of the position sensor 5 is installed on the outer wall of the clamping plate 4010. The rod-shaped material is clamped by the clamping plate 4010 through the external force of the spring 409, and then the cross-sectional diameter of the rod-shaped material is measured by the position sensor 5.

[0026] Working principle: The lifting frame 305 on the first connecting plate 306 is positioned, which in turn drives the second connecting plate 407 to be positioned. This causes the clamping plate 4010 on the telescopic rod 408 to compress the rod-shaped material. Then, through the external force of the spring 409, the clamping plate 4010 holds the rod-shaped material. The end diameter of the rod-shaped material is measured by the position sensor 5. Then, the third motor 402 is started to rotate the second lead screw 403. Under the action of the second threaded hole 405, the slide plate 404 on the push plate 406 slides along the slide groove 401, thereby pushing the rod-shaped material between the rolling rollers 309. The rolling rollers 309 roll the rod-shaped material multiple times. This automatic clamping and pushing of the rod-shaped material improves the automatic rolling process and enhances the efficiency of the equipment.

[0027] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-strength Ni-Co-Cr-Mo high-entropy alloy, characterized in that, The alloy's chemical composition includes nickel, cobalt, chromium, and molybdenum, with the following atomic ratios: nickel 35-40%, cobalt 25-40%, chromium 15-30%, and molybdenum 5-10%.

2. The high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 1, characterized in that, The atomic ratios of nickel, cobalt, chromium, and molybdenum in the high-entropy alloy are 37.6%, 28.2%, 28.2%, and 6%, respectively.

3. The high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 1, characterized in that, The atomic ratios of nickel, cobalt, chromium, and molybdenum in the high-entropy alloy are 35.51%, 35.37%, 22.91%, and 6.21%, respectively.

4. The high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 1, characterized in that, The atomic ratios of nickel, cobalt, chromium, and molybdenum in the high-entropy alloy are 37.6%, 32.9%, 23.5%, and 6%, respectively.

5. The method for preparing a high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 1, characterized in that, The process includes the following steps: Step 1, electric arc melting; Step 2, material casting; Step 3, homogenization treatment; Step 4, rolling. In step one, bulk Ni-Co-Cr-Mo high-entropy alloys are prepared by vacuum arc melting. The raw materials are 99.99% high-purity elemental nickel, cobalt, chromium and molybdenum. The vacuum pressure is 10-4 Pa and the melting current is 200 A. To ensure uniform mixing of the metal raw materials, the arc melting is repeated more than 5 times. In step two, the molten material is poured into the mold and then air-cooled to cast the material into a rod shape. In step three, the material after suction casting is sealed in a vacuum environment and heated to 1250°C for 24 hours for high-temperature homogenization treatment to eliminate component segregation. In step four, the homogenized material is rolled by a rolling mill at a speed of 300 r / min and a rolling ratio of 80%.

6. The apparatus used in the preparation method of a high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 5, characterized in that, In step four, the rolling mill includes a rolling mill body (1), a processing tank (2), a rolling assembly (3), a feeding assembly (4), and a position sensor (5). The rolling mill body (1) has a processing tank (2) on one side. The rolling assembly (3) is installed on the inner wall of one side of the processing tank (2). The feeding assembly (4) is installed on the inner wall of one side of the processing tank (2). The position sensor (5) is symmetrically installed on the inner wall of one side of the processing tank (2).

7. The apparatus used in the preparation method of a high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 6, characterized in that, The rolling assembly (3) includes a first motor (301), a first gear (302), a first lead screw (303), a second gear (304), a lifting frame (305), a first connecting plate (306), a first threaded hole (307), a second motor (308), and a rolling roll (309). A lifting frame (305) is symmetrically installed on one inner wall of the processing tank (2). A rolling roll (309) is rotatably connected to one inner wall of the lifting frame (305). A second motor (308) is embedded in the other inner wall of the lifting frame (305), and one end of the output shaft of the second motor (308) is fixed to the outer wall of the rolling roll (309). The lifting frame (305) has a first connecting plate (306) welded on both outer walls. The processing groove (2) has a first lead screw (303) welded on both inner walls. The first connecting plate (306) has a first threaded hole (307) on one side corresponding to the position of the first lead screw (303). A second gear (304) is fixedly connected to the outer wall of one end of the first lead screw (303). The two second gears (304) have a first gear (302) meshing on one outer wall. The processing groove (2) has a first motor (301) embedded on both inner walls. The output shaft of the first motor (301) is fixedly connected to the outer wall of the first gear (302).

8. The apparatus used in the preparation method of a high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 7, characterized in that, The feeding assembly (4) includes a chute (401), a third motor (402), a second lead screw (403), a slide plate (404), a second threaded hole (405), a push plate (406), a second connecting plate (407), a telescopic rod (408), a spring (409), and a clamping plate (4010). The second connecting plate (407) is welded to one outer wall of the lifting frame (305). The telescopic rod (408) is embedded in one inner wall of the second connecting plate (407). The clamping plate (4010) is fixedly connected to one outer wall of the telescopic rod (408). The spring (409) is fixedly connected to one side of the clamping plate (4010), and the other end of the spring (409) is fixedly connected to the spring (409). A push plate (406) is installed on one side of the clamping plate (4010) and a slide plate (404) is welded to the outer wall of the bottom end of the push plate (406). A slide groove (401) is opened on the inner wall of the bottom end of the processing groove (2) corresponding to the position of the slide plate (404). A second lead screw (403) is rotatably connected to one side of the inner wall of the slide groove (401). A second threaded hole (405) is opened on one side of the slide plate (404) corresponding to the position of the second lead screw (403). A third motor (402) is embedded in the inner wall of the other side of the slide groove (401), and one end of the output shaft of the third motor (402) is fixed to the outer wall of the second lead screw (403).

9. The apparatus used in the preparation method of a high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 7, characterized in that, The first gear (302) and the second gear (304) are bevel gears, and one side of the first gear (302) and the second gear (304) are perpendicular to each other.

10. The apparatus used in the preparation method of a high-strength Ni-Co-Cr-Mo high-entropy alloy according to claim 8, characterized in that, The spring (409) is sleeved on the outer wall of the telescopic rod (408), and one side of the position sensor (5) is installed on the outer wall of the clamping plate (4010).

Images