Cast high-damping manganese-copper alloy material and manufacturing method thereof

Abstract

The invention discloses a cast high-damping manganese-copper alloy material and a manufacturing method thereof, and relates to the technical field of alloy materials, and the cast high-damping manganese-copper alloy material comprises the following components in percentage by weight: 22%-28% of manganese, 3%-6% of aluminum, 1%-4% of chromium, 0.5%-1.5% of niobium, 0.5%-1% of titanium, 0.8%-1.6% of rare earth elements and the balance of copper. And the balance of copper and inevitable impurities. A manufacturing method for casting a high-damping manganese-copper alloy material comprises the following steps that S1, raw material pretreatment is conducted, specifically, metal copper, manganese, aluminum, chromium, niobium and titanium and intermediate alloy containing rare earth elements neodymium and praseodymium are selected as raw materials, and after surface chemical cleaning and ultrasonic cleaning treatment are conducted on the raw materials, the raw materials are dried for 3-5 hours in a vacuum environment at the temperature of 120-180 DEG C; according to the manganese-copper alloy and the preparation method thereof, the manganese-copper alloy shows excellent damping performance through the precise alloy composition proportion, for example, the niobium element promotes formation of a special phase, the rare earth element optimizes a microstructure, and especially the synergistic effect of neodymium and praseodymium.

Description

Technical Field

[0001] The invention relates to the technical field of alloy materials, in particular to a cast high-damping manganese-copper alloy material and a manufacturing method thereof. Background Art

[0002] In many areas of modern industry, such as aerospace, automotive manufacturing, mechanical engineering, and precision instruments, increasingly stringent requirements are being placed on the damping properties of alloy materials. High-damping materials can effectively suppress structural vibration and noise transmission, improving equipment stability, reliability, and service life, while also contributing to enhanced product performance and comfort. While traditional manganese-copper alloys possess a certain degree of damping performance, with the continuous advancement of technology, their damping properties are no longer able to meet the increasingly stringent application requirements.

[0003] In some complex working conditions, such as high-speed mechanical components, structural parts subjected to alternating loads, and precision instruments sensitive to vibration, manganese-copper alloy materials with higher damping performance are required to ensure the normal operation and accuracy of the equipment. Therefore, there is an urgent need to develop a manganese-copper alloy material with higher damping performance to meet these growing industrial needs. It is against this background that the present invention optimizes the microstructure of the manganese-copper alloy through the precise proportion of the manganese-copper alloy components and the synergistic effect of adding niobium and rare earth elements, especially neodymium and praseodymium, so that the manganese-copper alloy has better damping performance. Summary of the Invention

[0004] The object of the present invention is to provide a cast high-damping manganese-copper alloy material and a manufacturing method thereof, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A cast high-damping manganese-copper alloy material and a manufacturing method thereof, comprising the following components, by weight percentage: 22%-28% manganese, 3%-6% aluminum, 1%-4% chromium, 0.5%-1.5% niobium, 0.5%-1% titanium, 0.8%-1.6% rare earth elements, and the remainder being copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 60%-80% of the rare earth element component.

[0007] As an improved solution of the present invention: a cast high-damping manganese-copper alloy material, comprising the following components, by weight percentage: 24%-26% manganese, 4%-5% aluminum, 2%-3% chromium, 0.8%-1.2% niobium, 0.6%-0.9% titanium, 0.9%-1.5% rare earth elements, and the remainder being copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 62%-77% of the rare earth element component.

[0008] As an improved solution of the present invention: a cast high-damping manganese-copper alloy material, comprising the following components, by weight percentage: 25% manganese, 4.6% aluminum, 2.4% chromium, 1.1% niobium, 0.8% titanium, 1.2% rare earth elements, and the remainder being copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 70% of the rare earth element component.

[0009] A method for manufacturing a cast high-damping manganese-copper alloy material comprises the following steps:

[0010] Step S1: Raw material pretreatment: Metals such as copper, manganese, aluminum, chromium, niobium, titanium, and master alloys containing rare earth elements such as neodymium and praseodymium are selected as raw materials, and their surfaces are chemically cleaned and ultrasonically cleaned, followed by drying in a vacuum environment at a temperature of 120-180°C for 3-5 hours;

[0011] Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target prepared casting high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1250-1350℃ at a heating rate of 12-18℃ / min, stirring the raw materials by electromagnetic stirring, with a stirring power of 15-25kW and a frequency of 20-30Hz;

[0012] Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at a flow rate of 6-10 L / min for 20-30 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1280-1320°C.

[0013] Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 450-550°C at a casting speed of 2-3.5 kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 30-50 Hz and an amplitude of 0.5-1.5 mm. After casting, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 6-10°C / min.

[0014] Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon is introduced into the furnace, and the furnace temperature is raised to 900-1000°C at a heating rate of 8-12°C / min. The temperature is maintained for 5-8 hours, and then the ingot is cooled to below 600°C. The ingot is then removed from the furnace for air cooling.

[0015] Step S6: Hot working: The ingot after homogenization annealing is heated to 750-850°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 60%-80%. After each processing pass, the workpiece is returned to the furnace and heated to 750-850°C for 15-20 minutes;

[0016] Step S7: Aging treatment: The heat-treated alloy is aged at 450-550° C. for 3-5 hours. After the aging treatment, the alloy is naturally cooled to room temperature in air.

[0017] As an improved solution of the present invention: in the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value ranging from 8 to 9.5, and the frequency of the ultrasonic cleaning is 20 to 40 kHz and the power is 500 to 1000 W.

[0018] As an improved solution of the present invention: in the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the material of the stirring paddle is a high-temperature resistant ceramic material.

[0019] As an improvement to the present invention, in the refining step, a plurality of heating wires and temperature sensors evenly distributed in the furnace wall are provided in the vacuum arc furnace to ensure the uniformity of the alloy liquid temperature during the refining process, with the error controlled within ±3°C.

[0020] As an improved solution of the present invention: in the casting step, the inner wall of the graphite mold is coated with a boron nitride coating with a thickness of 0.3 mm.

[0021] As an improved solution of the present invention: in the hot working step, the deformation amount of each pass in the forging or rolling process is controlled between 10% and 20%, and the processing directions of adjacent passes are perpendicular to each other.

[0022] As an improved solution of the present invention: in the aging treatment step, the aging treatment is carried out in a vacuum environment with a vacuum degree of 4×10-3Pa.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention uses precise alloy component ratios, such as niobium to promote the formation of special phases, rare earth elements to optimize the microstructure, and especially the synergistic effect of neodymium and praseodymium, to enable the manganese-copper alloy to exhibit excellent damping performance, efficiently absorb and dissipate vibration energy, effectively suppress vibration and noise, greatly enhance the stability and reliability of equipment, and extend its service life. It is suitable for vibration-sensitive fields such as aerospace and automobiles.

[0025] 2. The present invention precisely controls all process parameters from raw material pretreatment to casting and heat treatment. Raw material pretreatment ensures raw material purity, smelting and refining ensure uniform and pure alloy composition, electromagnetic vibration in the casting process reduces defects and improves yield, homogenization annealing and aging treatment optimize the microstructure and enhance performance stability, thus ensuring stable alloy quality and large-scale efficient production, providing strong technical support for industrial applications. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention:

[0027] Example 1

[0028] In this embodiment, a cast high-damping manganese-copper alloy material includes the following components, by weight percentage: 22% manganese, 3% aluminum, 1% chromium, 0.5% niobium, 0.5% titanium, 0.8% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 60% of the rare earth element component.

[0029] A method for manufacturing a cast high-damping manganese-copper alloy material comprises the following steps:

[0030] Step S1: Raw material pretreatment: Metal copper, manganese, aluminum, chromium, niobium, titanium, and a master alloy containing rare earth elements neodymium and praseodymium are selected as raw materials, and their surfaces are subjected to chemical cleaning and ultrasonic cleaning, and then dried in a vacuum environment at a temperature of 120°C for 3 hours. In the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value of 8, and the ultrasonic cleaning frequency is 20kHz and the power is 500W.

[0031] Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target prepared casting high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1250 ° C at a heating rate of 12 ° C / min, stirring the raw materials by electromagnetic stirring, the stirring power is 15 kW, and the frequency is 20 Hz. In the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the stirring paddle is made of high-temperature resistant ceramic material;

[0032] Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at a flow rate of 6 L / min. The refining time is 20 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1280°C.

[0033] Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 450°C at a casting speed of 2kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 30Hz and an amplitude of 0.5mm. After the casting is completed, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 6°C / min. During the refining step, the vacuum arc furnace is provided with a plurality of heating wires and temperature sensors evenly distributed in the furnace wall to ensure the uniformity of the alloy liquid temperature during the refining process, with an error controlled within ±3°C. During the casting step, the inner wall of the graphite mold is coated with a boron nitride coating with a thickness of 0.3mm;

[0034] Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon gas is introduced into the furnace, and the furnace temperature is raised to 900°C at a heating rate of 8°C / min. The temperature is maintained for 5 hours, and then the ingot is cooled to below 600°C. The ingot is then removed from the furnace for air cooling.

[0035] Step S6: Hot working: The ingot after homogenization annealing is heated to 750°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 60%. After each process, the workpiece is returned to the furnace and heated to 750°C for 15 minutes. During the hot working step, the deformation of each forging or rolling process is controlled within 10%, and the processing directions of adjacent passes are perpendicular to each other.

[0036] Step S7: Aging treatment: The alloy after hot working is aged at 450°C for 3 hours. After the aging treatment is completed, the alloy is naturally cooled to room temperature in air. In the aging treatment step, the aging treatment is carried out in a vacuum environment with a vacuum degree of 4×10 -3 Pa.

[0037] Example 2

[0038] In this embodiment, a cast high-damping manganese-copper alloy material includes the following components, by weight percentage: 28% manganese, 6% aluminum, 4% chromium, 1.5% niobium, 1% titanium, 1.6% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 80% of the rare earth element component.

[0039] A method for manufacturing a cast high-damping manganese-copper alloy material comprises the following steps:

[0040] Step S1: Raw material pretreatment: Metal copper, manganese, aluminum, chromium, niobium, titanium, and a master alloy containing rare earth elements neodymium and praseodymium are selected as raw materials, and their surfaces are subjected to chemical cleaning and ultrasonic cleaning, and then dried in a vacuum environment at a temperature of 180°C for 5 hours. In the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value of 9.5, and the frequency of the ultrasonic cleaning is 40kHz and the power is 1000W.

[0041] Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target prepared casting high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1350 ° C at a heating rate of 18 ° C / min, stirring the raw materials by electromagnetic stirring, the stirring power is 25 kW, and the frequency is 30 Hz. In the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the stirring paddle is made of high-temperature resistant ceramic material;

[0042] Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at an argon flow rate of 10 L / min for 30 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1320°C.

[0043] Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 550°C at a casting speed of 3.5kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 50Hz and an amplitude of 1.5mm. After the casting is completed, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 10°C / min. During the refining step, the vacuum arc furnace is provided with a plurality of heating wires and temperature sensors evenly distributed in the furnace wall to ensure the uniformity of the alloy liquid temperature during the refining process, with an error controlled within ±3°C. During the casting step, the inner wall of the graphite mold is coated with a boron nitride coating with a thickness of 0.3mm;

[0044] Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon gas is introduced into the furnace, and the furnace temperature is raised to 1000°C at a heating rate of 12°C / min. The temperature is maintained for 8 hours, and then the ingot is cooled to below 600°C. The ingot is then removed from the furnace for air cooling.

[0045] Step S6: Hot working: The ingot after homogenization annealing is heated to 850°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 80%. After each process, the workpiece is returned to the furnace and heated to 850°C for 20 minutes. During the hot working step, the deformation of each forging or rolling process is controlled within 20%, and the processing directions of adjacent processes are perpendicular to each other.

[0046] Step S7: Aging Treatment: The hot-worked alloy is aged at 550°C for 5 hours. After aging, the alloy is naturally cooled to room temperature in air. The aging treatment is performed in a vacuum environment with a vacuum level of 4 × 10⁻³ Pa.

[0047] Example 3

[0048] In this embodiment, a cast high-damping manganese-copper alloy material includes the following components, by weight percentage: 24% manganese, 4% aluminum, 2% chromium, 0.8% niobium, 0.6% titanium, 0.9% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 62% of the rare earth element component.

[0049] A method for manufacturing a cast high-damping manganese-copper alloy material comprises the following steps:

[0050] Step S1: Raw material pretreatment: Metal copper, manganese, aluminum, chromium, niobium, titanium, and a master alloy containing rare earth elements neodymium and praseodymium are selected as raw materials, and their surfaces are subjected to chemical cleaning and ultrasonic cleaning, and then dried in a vacuum environment at a temperature of 160°C for 4 hours. In the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value of 8.5, and the ultrasonic cleaning frequency is 30kHz and the power is 800W.

[0051] Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target prepared casting high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1300°C at a heating rate of 16°C / min, stirring the raw materials by electromagnetic stirring, with a stirring power of 20kW and a frequency of 25Hz. In the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the stirring paddle is made of high-temperature resistant ceramic material;

[0052] Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at a flow rate of 8 L / min. The refining time is 25 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1300°C.

[0053] Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 500°C at a casting speed of 3kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 40Hz and an amplitude of 1.2mm. After the casting is completed, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 8°C / min. During the refining step, the vacuum arc furnace is provided with a plurality of heating wires and temperature sensors evenly distributed in the furnace wall to ensure the uniformity of the alloy liquid temperature during the refining process, with an error controlled within ±3°C. During the casting step, the inner wall of the graphite mold is coated with a boron nitride coating with a thickness of 0.3mm;

[0054] Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon gas is introduced into the furnace, and the furnace temperature is raised to 950°C at a heating rate of 10°C / min. The temperature is maintained for 6 hours, and then the ingot is cooled to below 600°C in the furnace, and then removed from the furnace for air cooling.

[0055] Step S6: Hot working: The ingot after homogenization annealing is heated to 800°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 70%. After each process, the workpiece is returned to the furnace and heated to 800°C for 18 minutes. During the hot working step, the deformation of each forging or rolling process is controlled within 15%, and the processing directions of adjacent passes are perpendicular to each other.

[0056] Step S7: Aging Treatment: The hot-worked alloy is aged at 500°C for 4 hours. After the aging treatment, the alloy is naturally cooled to room temperature in air. The aging treatment is performed in a vacuum environment with a vacuum level of 4 × 10⁻³ Pa.

[0057] Example 4

[0058] In this embodiment, a cast high-damping manganese-copper alloy material includes the following components, by weight percentage: 26% manganese, 5% aluminum, 3% chromium, 1.2% niobium, 0.9% titanium, 1.5% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 77% of the rare earth element composition.

[0059] A method for manufacturing a cast high-damping manganese-copper alloy material comprises the following steps:

[0060] Step S1: Raw material pretreatment: Metal copper, manganese, aluminum, chromium, niobium, titanium, and a master alloy containing rare earth elements neodymium and praseodymium are selected as raw materials, and their surfaces are subjected to chemical cleaning and ultrasonic cleaning, and then dried in a vacuum environment at a temperature of 160°C for 4 hours. In the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value of 8.5, and the ultrasonic cleaning frequency is 30kHz and the power is 800W.

[0061] Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target prepared casting high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1300°C at a heating rate of 16°C / min, stirring the raw materials by electromagnetic stirring, with a stirring power of 20kW and a frequency of 25Hz. In the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the stirring paddle is made of high-temperature resistant ceramic material;

[0062] Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at a flow rate of 8 L / min. The refining time is 25 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1300°C.

[0063] Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 500°C at a casting speed of 3kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 40Hz and an amplitude of 1.2mm. After the casting is completed, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 8°C / min. During the refining step, the vacuum arc furnace is provided with a plurality of heating wires and temperature sensors evenly distributed in the furnace wall to ensure the uniformity of the alloy liquid temperature during the refining process, with an error controlled within ±3°C. During the casting step, the inner wall of the graphite mold is coated with a boron nitride coating with a thickness of 0.3mm;

[0064] Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon gas is introduced into the furnace, and the furnace temperature is raised to 950°C at a heating rate of 10°C / min. The temperature is maintained for 6 hours, and then the ingot is cooled to below 600°C in the furnace, and then removed from the furnace for air cooling.

[0065] Step S6: Hot working: The ingot after homogenization annealing is heated to 800°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 70%. After each process, the workpiece is returned to the furnace and heated to 800°C for 18 minutes. During the hot working step, the deformation of each forging or rolling process is controlled within 15%, and the processing directions of adjacent passes are perpendicular to each other.

[0066] Step S7: Aging treatment: The alloy after hot working is aged at 500°C for 4 hours. After the aging treatment is completed, the alloy is naturally cooled to room temperature in air. In the aging treatment step, the aging treatment is carried out in a vacuum environment with a vacuum degree of 4×10 -3 Pa.

[0067] Example 5

[0068] In this embodiment, a cast high-damping manganese-copper alloy material includes the following components, by weight percentage: 25% manganese, 4.6% aluminum, 2.4% chromium, 1.1% niobium, 0.8% titanium, 1.2% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 70% of the rare earth element component.

[0069] A method for manufacturing a cast high-damping manganese-copper alloy material comprises the following steps:

[0070] Step S1: Raw material pretreatment: Metal copper, manganese, aluminum, chromium, niobium, titanium, and a master alloy containing rare earth elements neodymium and praseodymium are selected as raw materials, and their surfaces are subjected to chemical cleaning and ultrasonic cleaning, and then dried in a vacuum environment at a temperature of 160°C for 4 hours. In the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value of 8.5, and the ultrasonic cleaning frequency is 30kHz and the power is 800W.

[0071] Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target prepared casting high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1300°C at a heating rate of 16°C / min, stirring the raw materials by electromagnetic stirring, with a stirring power of 20kW and a frequency of 25Hz. In the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the stirring paddle is made of high-temperature resistant ceramic material;

[0072] Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at a flow rate of 8 L / min. The refining time is 25 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1300°C.

[0073] Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 500°C at a casting speed of 3kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 40Hz and an amplitude of 1.2mm. After the casting is completed, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 8°C / min. During the refining step, the vacuum arc furnace is provided with a plurality of heating wires and temperature sensors evenly distributed in the furnace wall to ensure the uniformity of the alloy liquid temperature during the refining process, with an error controlled within ±3°C. During the casting step, the inner wall of the graphite mold is coated with a boron nitride coating with a thickness of 0.3mm;

[0074] Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon gas is introduced into the furnace, and the furnace temperature is raised to 950°C at a heating rate of 10°C / min. The temperature is maintained for 6 hours, and then the ingot is cooled to below 600°C in the furnace, and then removed from the furnace for air cooling.

[0075] Step S6: Hot working: The ingot after homogenization annealing is heated to 800°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 70%. After each process, the workpiece is returned to the furnace and heated to 800°C for 18 minutes. During the hot working step, the deformation of each forging or rolling process is controlled within 15%, and the processing directions of adjacent passes are perpendicular to each other.

[0076] Step S7: Aging Treatment: The hot-worked alloy is aged at 500°C for 4 hours. After the aging treatment, the alloy is naturally cooled to room temperature in air. The aging treatment is performed in a vacuum environment with a vacuum level of 4 × 10⁻³ Pa.

[0077] Comparative Example 1

[0078] In this comparative example, a cast high-damping manganese-copper alloy material includes the following components, by weight percentage: 25% manganese, 4.6% aluminum, 2.4% chromium, 0.8% titanium, 1.2% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is a mixture of neodymium and praseodymium, and by weight percentage, neodymium accounts for 70% of the rare earth element component.

[0079] The steps of the manufacturing method of a cast high-damping manganese-copper alloy material in this comparative example are the same as those in Example 5.

[0080] Comparative Example 2

[0081] A cast high-damping manganese-copper alloy material comprises the following components by weight: 25% manganese, 4.6% aluminum, 2.4% chromium, 1.1% niobium, 0.8% titanium, and the remainder being copper and unavoidable impurities.

[0082] The steps of the manufacturing method of a cast high-damping manganese-copper alloy material in this comparative example are the same as those in Example 5.

[0083] Comparative Example 3

[0084] In this comparative example, a cast high-damping manganese-copper alloy material comprises the following components, by weight percentage: 25% manganese, 4.6% aluminum, 2.4% chromium, 0.8% titanium, 1.2% rare earth elements, and the remainder being copper and unavoidable impurities, wherein the rare earth element is neodymium.

[0085] The steps of the manufacturing method of a cast high-damping manganese-copper alloy material in this comparative example are the same as those in Example 5.

[0086] Comparative Example 4

[0087] In this comparative example, a cast high-damping manganese-copper alloy material comprises the following components, by weight percentage: 25% manganese, 4.6% aluminum, 2.4% chromium, 0.8% titanium, 1.2% rare earth elements, and the remainder copper and unavoidable impurities, wherein the rare earth element is praseodymium.

[0088] The steps of the manufacturing method of a cast high-damping manganese-copper alloy material in this comparative example are the same as those in Example 5.

[0089] Comparative Example 5

[0090] The manufacturing method of a cast high-damping manganese-copper alloy material in this comparative example is the same as that in Example 5, except that in the casting process of step S4, "an electromagnetic vibration device is used to vibrate the mold with a vibration frequency of 40 Hz and an amplitude of 1.2 mm" is missing.

[0091] Table 1 is a comparison table of the damping properties of the manganese-copper alloy materials in the above-mentioned Examples 1-5 and the manganese-copper alloy materials in Comparative Examples 1-5:

[0092] Table 1

[0093]

[0094]

[0095] From the above data in Table 1, we can see that:

[0096] 1. Influence of the composition of cast manganese-copper alloy on damping performance:

[0097] Effect of niobium: A comparison of Example 5 and Comparative Example 1 shows that the loss factor measured in Example 5 is 0.077, while that in Comparative Example 1 (excluding niobium) is 0.051. The internal friction (Q-1) measured in Example 5 is 0.0242, while that in Comparative Example 1 is 0.0227. The addition of niobium can promote the formation of special phases in the alloy. These phases can effectively absorb and dissipate vibration energy, thereby improving the damping performance of the alloy at both room and high temperatures.

[0098] Effect of rare earth elements: A comparison of Example 5 and Comparative Example 2 shows that the loss factor (tan δ) measured in Example 5 is 0.077, while that in Comparative Example 2 (which does not contain rare earth elements) is 0.024. The internal friction (Q-1) measured in Example 5 is 0.0242, while that in Comparative Example 2 is 0.0109. Rare earth elements promote the formation of a more uniform microstructure during solidification, alter the alloy's solidification pattern, regularize the growth direction and morphology of grains, and reduce defects within the grains. This microstructure makes dislocations more susceptible to changes in grain boundaries and internal grain structure during movement within the alloy, thereby increasing energy dissipation pathways and improving the alloy's damping performance.

[0099] Regarding the mixing ratio of neodymium and praseodymium among the rare earth elements, a comparison of Comparative Example 3 (only neodymium as a rare earth element) and Comparative Example 4 (only praseodymium as a rare earth element) with Example 5 shows that the damping performance indicators measured in Example 5 are superior to those of Comparative Example 3 and Comparative Example 4. This means that when rare earth elements are present in the form of a mixture of neodymium and praseodymium, they can better enhance the damping performance of the alloy. Due to the synergistic effect of neodymium and praseodymium in the alloy, the degree of lattice distortion or the phase interface state within the alloy is more conducive to energy absorption and dissipation. The main role of praseodymium in manganese-copper alloy is to refine the grains and increase the interfacial energy of the grain boundaries. It can increase the nucleation points in the early stage of alloy solidification and inhibit the coarsening of grains. The presence of praseodymium will increase the interfacial energy of the grain boundaries. When the alloy is vibrated or deformed, dislocations are more likely to accumulate and interact at the grain boundaries. The grain size of the alloy will decrease and the activity of the grain boundaries will increase. When dislocations move at highly active grain boundaries, more dislocation accumulation and reaction will occur, thereby consuming more vibration energy and effectively improving the damping performance of the alloy.

[0100] 2. Influence of the manufacturing process of cast manganese-copper alloy on damping performance

[0101] Effect of Electromagnetic Vibration Treatment: A comparison of Example 5 and Comparative Example 5 shows that the loss factor (tan δ) measured in Example 5 is 0.077, while that in Comparative Example 5 (which lacks electromagnetic vibration during the casting process) is 0.064. The internal friction (Q-1) measured in Example 5 is 0.0242, while that in Comparative Example 5 is 0.0236. During the casting process, electromagnetic vibration of the mold improves the flow of the alloy liquid within the mold, reduces internal defects such as pores and looseness, and makes the internal structure of the alloy more uniform and dense, thereby enhancing the damping performance.

[0102] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0103] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A cast high damping manganese copper alloy material, characterized in that: The invention comprises the following components by weight: 22%-28% manganese, 3%-6% aluminum, 1%-4% chromium, 0.5%-1.5% niobium, 0.5%-1% titanium, 0.8%-1.6% rare earth elements, and the remainder copper and unavoidable impurities. The rare earth elements are a mixture of neodymium and praseodymium, and by weight, neodymium accounts for 60%-80% of the rare earth element composition.

2. The cast high damping manganese-copper alloy material according to claim 1, characterized in that: Calculated by weight, it includes the following components: 24%-26% manganese, 4%-5% aluminum, 2%-3% chromium, 0.8%-1.2% niobium, 0.6%-0.9% titanium, 0.9%-1.5% rare earth elements, and the rest are copper and unavoidable impurities. The rare earth elements are a mixture of neodymium and praseodymium, and in terms of weight percentage, neodymium accounts for 62%-77% of the rare earth element composition.

3. The cast high damping manganese-copper alloy material according to claim 2, characterized in that: In terms of weight percentage, it includes the following components: 25% manganese, 4.6% aluminum, 2.4% chromium, 1.1% niobium, 0.8% titanium, 1.2% rare earth elements, and the rest is copper and unavoidable impurities. The rare earth elements are a mixture of neodymium and praseodymium, and in terms of weight percentage, neodymium accounts for 70% of the rare earth element composition.

4. A method for manufacturing a cast high-damping manganese-copper alloy material according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step S1: Raw material pretreatment: Metals such as copper, manganese, aluminum, chromium, niobium, titanium, and master alloys containing rare earth elements such as neodymium and praseodymium are selected as raw materials, and their surfaces are chemically cleaned and ultrasonically cleaned, followed by drying in a vacuum environment at a temperature of 120-180°C for 3-5 hours; Step S2: Melting: The pre-treated raw materials are weighed according to the element mass percentage ratio of the target high damping manganese copper alloy material, and then placed in a vacuum arc furnace for melting. The vacuum is first evacuated to 8×10 -4 Pa, heating to 1250-1350℃ at a heating rate of 12-18℃ / min, stirring the raw materials by electromagnetic stirring, with a stirring power of 15-25kW and a frequency of 20-30Hz; Step S3: Refining: After smelting is completed, argon gas is introduced into the vacuum arc furnace for refining at a flow rate of 6-10 L / min for 20-30 minutes. During the refining process, electromagnetic induction heating is used to maintain the alloy liquid temperature at 1280-1320°C. Step S4: Casting: After refining, the alloy liquid is cast into a graphite mold preheated to 450-550°C at a casting speed of 2-3.5 kg / s. During the casting process, the mold is vibrated by an electromagnetic vibration device with a vibration frequency of 30-50 Hz and an amplitude of 0.5-1.5 mm. After casting, the mold is covered with insulation material and the ingot in the mold is slowly cooled to room temperature at a cooling rate of 6-10°C / min. Step S5: Homogenization annealing: The ingot is placed in an atmosphere-protected resistance furnace for homogenization annealing. Argon is introduced into the furnace, and the furnace temperature is raised to 900-1000°C at a heating rate of 8-12°C / min. The temperature is maintained for 5-8 hours, and then the ingot is cooled to below 600°C. The ingot is then removed from the furnace for air cooling. Step S6: Hot working: The ingot after homogenization annealing is heated to 750-850°C and subjected to multiple forging or rolling processes, with the total deformation controlled at 60%-80%. After each processing pass, the workpiece is returned to the furnace and heated to 750-850°C for 15-20 minutes; Step S7: Aging treatment: The heat-treated alloy is aged at 450-550° C. for 3-5 hours. After the aging treatment, the alloy is naturally cooled to room temperature in air.

5. The method for manufacturing a cast high-damping manganese-copper alloy material according to claim 4, characterized in that: In the raw material pretreatment step, the cleaning agent used in the chemical cleaning is an alkaline solution with a pH value ranging from 8 to 9.5, and the frequency of the ultrasonic cleaning is 20 to 40 kHz and the power is 500 to 1000 W.

6. The method for manufacturing a cast high-damping manganese-copper alloy material according to claim 4, characterized in that: In the smelting step, the electromagnetic stirring stirrer adopts a spiral stirring paddle, and the material of the stirring paddle is a high-temperature resistant ceramic material.

7. The method for manufacturing a cast high-damping manganese-copper alloy material according to claim 4, characterized in that: During the refining step, the vacuum arc furnace is provided with a plurality of heating wires and temperature sensors evenly distributed in the furnace wall to ensure the uniformity of the alloy liquid temperature during the refining process, with the error controlled within ±3°C.

8. The method for manufacturing a cast high-damping manganese-copper alloy material according to claim 4, characterized in that: During the casting step, the inner wall of the graphite mold is coated with a boron nitride coating having a thickness of 0.3 mm.

9. The method for manufacturing a cast high-damping manganese-copper alloy material according to claim 4, characterized in that: In the hot working step, the deformation amount of each pass in the forging or rolling process is controlled between 10% and 20%, and the processing directions of adjacent passes are perpendicular to each other.

10. The method for manufacturing a cast high-damping manganese-copper alloy material according to claim 4, characterized in that: In the aging treatment step, the aging treatment is carried out in a vacuum environment with a vacuum degree of 4×10-3Pa.

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