Rare earth Y and Sc doped Cu-Cr-Zr alloy material and preparation method thereof

Abstract

The invention discloses a rare earth Y and Sc doped Cu-Cr-Zr alloy material and a preparation method thereof.The rare earth Y and Sc doped Cu-Cr-Zr alloy material comprises, by mass, 1.5% of Cr, 0.05% of Zr, 0.05%-0.09% of Y, 0.01%-0.05% of Sc and the balance pure Cu and inevitable impurities, and Cr, Zr, Y and Sc are added in the form of Cu-Cr intermediate alloy, Cu-Zr intermediate alloy, Cu-Y intermediate alloy and Cu-Sc intermediate alloy respectively; the preparation method comprises the steps that pure Cu, a Cu-Cr intermediate alloy, a Cu-Zr intermediate alloy, a Cu-Y intermediate alloy and a Cu-Sc intermediate alloy serve as raw materials, weighing is conducted according to the mass percent of different components of the final alloy, namely, 1.5% of Cr, 0.05% of Zr, 0.05%-0.09% of Y, 0.01%-0.05% of Sc and the balance Cu, ultrasonic cleaning and drying are conducted on the prepared raw materials, vacuum arc melting is conducted, a rare earth copper-chromium-zirconium alloy cast ingot is obtained, and then solution treatment and cold rolling machining are conducted in sequence; the cold-rolled rare earth copper chromium zirconium alloy blank is subjected to aging treatment and then subjected to water quenching, and a Cu-Cr-Zr-Y-Sc alloy material is obtained; the method has the outstanding advantages of being short in technological process, low in production cost and more suitable for large-scale production.

Description

Technical Field

[0001] This invention relates to the field of rare earth copper alloy technology, specifically to a rare earth Y and Sc doped Cu-Cr-Zr alloy material and its preparation method. Background Technology

[0002] Cu-Cr-Zr alloys, as typical high-strength and high-conductivity copper alloys, are widely used in key areas such as lead frames for large-scale integrated circuits, contact lines for high-speed rail transit, and contacts for power switches due to their excellent comprehensive properties. These applications require materials to simultaneously possess high strength, high conductivity, good plasticity, and excellent resistance to high-temperature softening. However, according to classical metallurgical theory, there is an inherent inverse relationship between the strength and conductivity of a material; any microstructural modifications aimed at improving strength (such as solid solution or precipitation) usually exacerbate electron scattering, leading to a decrease in conductivity. Therefore, how to overcome this performance bottleneck and achieve a synergistic improvement in strength, conductivity, and plasticity has become the focus and challenge of technical research in this field.

[0003] To reconcile this contradiction, researchers generally adopt a process route combining microalloying with complex thermomechanical treatment. For example, patent CN113564408A describes a Cu-Cr-Zr-Y alloy that, by adding rare earth Y and combining it with an alternating heat treatment process of "three rolling and three aging," successfully increased the tensile strength to over 700 MPa and the electrical conductivity to over 80% IACS. However, this technical solution has significant shortcomings: firstly, it relies too heavily on multiple cold rolling processes with large deformations, resulting in severe damage to the material's plasticity, with an elongation of only about 7.1%, limiting its application in applications requiring good formability. To quantify the synergistic level of the alloy's strength-ductility-electrical conductivity, a comprehensive performance index Z is introduced, expressed as Z = σ × k^(1 / 2) × ε. Where σ is the tensile strength (unit: MPa), k is the relative electrical conductivity (unit: %IACS), and ε is the elongation (expressed as a decimal). The index is a dimensionless evaluation parameter. The higher the value, the better the comprehensive performance of the material. However, the comprehensive performance factor of the Cu-Cr-Zr-Y alloy prepared by this invention is relatively low (about 470). Secondly, the "three-rolling and three-times" process is cumbersome and lengthy, which poses a challenge to efficiency and cost control in industrial production.

[0004] Patent application CN120442985A discloses a copper-chromium-zirconium-scandium alloy sheet and strip and its preparation method. This method achieves a tensile strength of 624 MPa and an conductivity of 79.1% IACS by introducing Sc to generate a grain boundary pinning effect and employing a complex process of "two aging cycles combined with three cold rolling cycles." However, this method has significant shortcomings in key performance indicators: its high-temperature softening temperature is only 562℃, failing to break through the key technical indicator of 600℃; simultaneously, the material elongation is only 7%, indicating poor plasticity and resulting in a low comprehensive performance factor (Z value approximately 388). Furthermore, the production route of alternating multi-stage cold rolling and multi-stage aging is cumbersome, with a long processing cycle and high cost. These factors collectively restrict the large-scale industrial application prospects of this technology.

[0005] In summary, existing high-strength, high-conductivity copper alloys generally suffer from two major bottlenecks: performance imbalance and strong process dependence. While pursuing a single performance indicator, it is difficult to achieve an excellent balance of comprehensive performance, and its realization often comes at the cost of complex processes and high manufacturing costs, severely restricting its reliable application in high-end technology fields. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention aims to provide a rare earth Y and Sc doped Cu-Cr-Zr alloy material and its preparation method, utilizing the synergistic effect of Y and Sc elements and designing a "solid solution" Cold rolling The "aging" heat treatment route is simple and efficient, and can achieve a better match between strength, plasticity and conductivity while ensuring high conductivity. The alloy material provided by this invention has excellent thermal stability, especially its excellent resistance to softening at high temperatures. In addition, this invention has the outstanding advantages of short process flow, low production cost and greater suitability for large-scale production.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance being pure Cu and unavoidable impurities.

[0008] The Cr, Zr, Y, and Sc are added in the form of Cu-Cr master alloy, Cu-Zr master alloy, Cu-Y master alloy, and Cu-Sc master alloy, respectively.

[0009] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy material includes the following steps: Step 1: Using pure Cu, Cu-Cr master alloy, Cu-Zr master alloy, Cu-Y master alloy, and Cu-Sc master alloy as raw materials, weigh the different components according to the following mass percentages in the final alloy: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance Cu. Ultrasonically clean and dry the prepared raw materials, and then melt them through vacuum arc melting to obtain rare earth copper-chromium-zirconium alloy ingots. Step 2: The rare earth copper-chromium-zirconium alloy ingot is subjected to solution treatment at a temperature of 950~1000℃ for 0.5~2h to obtain rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet is cold-rolled, with a total deformation of 75-85%; Step 4: The cold-rolled rare earth copper-chromium-zirconium alloy billet is aged at 440~460℃ for 1~2.5h, followed by water quenching to obtain Cu-Cr-Zr-Y-Sc alloy material.

[0010] In step 1, the mass percentage of Cr in the Cu-Cr master alloy is 10-20%; the mass percentage of Zr in the Cu-Zr master alloy is 10-40%; the mass percentage of Y in the Cu-Y master alloy is 10-20%; and the mass percentage of Sc in the Cu-Sc master alloy is 10-20%.

[0011] The smelting method in step 1 is as follows: According to the mass percentages of the different components in the final alloy: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance being pure Cu, the Cu-Cr master alloy, pure Cu, Cu-Sc master alloy, Cu-Zr master alloy, and Cu-Y master alloy are sequentially placed in a water-cooled copper crucible of a non-consumable vacuum arc melting furnace. A vacuum is then drawn to reduce the furnace chamber pressure to 1×10⁻⁶. - ³~2×10 - The melting process is carried out under an inert atmosphere: the electric arc is started, and the initial current is set to 80~150 A. After the surface of the metal block appears to be molten, the current is gradually increased in a stepwise manner, with each stage increasing by 80~120 A and held for 3~5 seconds in each stage, until the current reaches 450~500 A. After the alloy is completely melted, the melting current is maintained for 40~60 seconds, and electromagnetic stirring is used to promote the full homogenization of the alloy liquid composition. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-stage melting ingot. After the first-stage melting ingot is completely solidified, it is flipped and remelted at least 4 times to obtain a rare earth copper-chromium-zirconium alloy ingot.

[0012] The solution treatment method in step 2 is as follows: the rare earth copper-chromium-zirconium alloy ingot obtained in step 1 is wire-cut into blocks with a thickness of not less than 7 mm, and then placed in a quartz tube. After the quartz tube is subjected to multiple vacuuming and inert gas washing cycles, the vacuum degree inside the quartz tube is reduced to (7~8)*10E-4 Pa and then vacuum-sealed. Subsequently, the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot is placed in an annealing furnace and held at 950~1000℃ for 0.5~2 h. Then, it is water-quenched to obtain the rare earth copper-chromium-zirconium alloy billet.

[0013] The cold rolling process in step 3 is as follows: the rare earth copper-chromium-zirconium alloy billet after solution treatment in step 2 is rolled at room temperature at 75-85%.

[0014] The aging treatment method in step 4 is as follows: the rare earth copper-chromium-zirconium alloy billet after cold rolling in step 3 is placed in a quartz tube, and the quartz tube is subjected to multiple vacuuming and inert gas washing cycles. After the vacuum degree inside the quartz tube drops to (7~8)*10E-4Pa, the tube is vacuum sealed, and then placed in an annealing furnace, maintaining the temperature at 440~460℃ for 1~2.5h. Subsequently, it is water quenched to obtain Cu-Cr-Zr-Y-Sc alloy material.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) This invention relates to a rare-earth Y and Sc-doped Cu-Cr-Zr alloy material, which breaks through the limitations of single rare-earth microalloying by innovatively introducing yttrium (Y) and scandium (Sc) to form a composite additive system. Through a "synergistic purification-refinement" mechanism, the two work together on the alloy's microstructure: while effectively purifying the matrix and reducing electron scattering by impurities, they significantly refine the grains and regulate the size and distribution of precipitated phases, making them more dispersed and uniform. This synergistic effect induces strong precipitation strengthening and significantly improves strength, while minimizing the damage to conductivity caused by solute atoms and lattice distortion, laying the microstructure foundation for achieving synergistic optimization of key properties.

[0016] (2) In the vacuum arc melting step of step 1 of this invention, the oxidation and volatilization of the alloy melt are effectively reduced by first using high vacuum and inert gas protection. Furthermore, the current is increased in a stepwise manner to ensure a stable and controllable melting process, effectively avoiding ingot defects caused by thermal shock. Based on this, the final melting current is precisely controlled within the optimal range, and electromagnetic stirring effectively promotes the homogenization of the melt, eliminating component segregation. Finally, by slowly reducing the current after melting, the internal stress of the ingot is significantly reduced, the tendency for hot cracking is eliminated, and macroscopic shrinkage porosity is reduced, ultimately obtaining a complete, dense, and low-stress ingot.

[0017] (3) This invention achieves synergistic optimization of alloy strength, conductivity, and plasticity through the simplified "solution-rolling-aging" process path constructed in steps 2-4, combined with the synergistic effect of Y and Sc composite addition. In the solution treatment in step 2, alloying elements (Cr, Zr, Y, Sc) are fully dissolved in the copper matrix to form a supersaturated solid solution; the rolling process in step 3 introduces high-density dislocations and vacancies into the alloy; the aging treatment in step 4 uses these defects as diffusion channels and nucleation cores to promote the uniform dispersion of solute atoms in the form of fine precipitates. The addition of Y and Sc elements further refines the size of the precipitates, improves their distribution uniformity, and enhances the precipitation strengthening effect; at the same time, the full precipitation of solute atoms in the matrix effectively reduces lattice distortion and significantly improves the conductivity of the alloy. It is worth noting that although the "solution-rolling-aging" process is a common one, the synergistic microalloying design of Y and Sc allows this simple process route to achieve performance potential far exceeding that of alloys with conventional compositions. While maintaining process simplicity and efficiency, it achieves synergistic optimization of tensile strength (494 MPa), electrical conductivity (85% IACS), and plasticity (14% elongation), with its comprehensive performance factor (Z value 638) significantly superior to the background technology. In addition, the alloy exhibits a high-temperature softening temperature exceeding 600℃, demonstrating excellent thermal stability. Attached Figure Description

[0018] Figure 1 Comparison of the properties of Cu-Cr-Zr alloys with no rare earth elements, only Y element, only Sc element, and combined Y and Sc elements.

[0019] Figure 2 This is a microstructure diagram of Cu-1.5Cr-0.05Zr in Comparative Example 1 of the present invention.

[0020] Figure 3 This is a microstructure diagram of Cu-1.5Cr-0.05Zr-0.0875Y-0.0125Sc in Example 1 of the present invention. Detailed Implementation

[0021] The technical solutions and effects of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance being pure Cu and unavoidable impurities. The Cr, Zr, Y and Sc elements are all added in the form of intermediate alloys.

[0023] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy materials, which involves mixed doping of rare earth elements Y and Sc into Cu-Cr-Zr alloys, combined with "solid solution treatment". Cold rolling The "aging" heat treatment process achieves a synergistic enhancement of alloy strength, electrical conductivity, and ductility, including the following steps: Step 1: Using pure Cu, Cu-Cr master alloy, Cu-Zr master alloy, Cu-Y master alloy, and Cu-Sc master alloy as raw materials, weigh the different components according to the following mass percentages in the final alloy: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance Cu. Ultrasonically clean and dry the prepared raw materials, and then melt them through vacuum arc melting to obtain rare earth copper-chromium-zirconium alloy ingots. In the Cu-Cr master alloy, the mass percentage of Cr is 10-20%; in the Cu-Zr master alloy, the mass percentage of Zr is 10-40%; in the Cu-Y master alloy, the mass percentage of Y is 10-20%; and in the Cu-Sc master alloy, the mass percentage of Sc is 10-20%. The smelting method in step 1 is as follows: According to the mass percentages of the different components in the final alloy: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance being pure Cu, the Cu-Cr master alloy, pure Cu, Cu-Sc master alloy, Cu-Zr master alloy, and Cu-Y master alloy are sequentially placed in a water-cooled copper crucible of a non-consumable vacuum arc melting furnace. A vacuum is then drawn to reduce the furnace chamber pressure to 1×10⁻⁶. - ³~2×10 - The melting process is carried out under an inert atmosphere: the electric arc is started, and the initial current is set to 80~150 A. After the surface of the metal block appears to be in a molten state, the current is gradually increased in a stepwise manner, with each stage increasing by 80~120 A and held for 3~5 seconds in each current stage, until the current rises to 450~500 A. At this time, the alloy material is completely melted into a bright, fluid liquid metal ball. According to the experimental verification of the present invention, when the current rises to the range of 450~500 A, the above-mentioned ideal melting state can be stably achieved. After the alloy is completely melted, the melting current is maintained for 40~60 seconds, and the electromagnetic stirring of the equipment is fully utilized to promote the homogenization of the alloy liquid composition. Then, the current is slowly adjusted to the minimum, so that the melt is solidified in a water-cooled copper crucible to obtain a first-melting ingot. After the first-melting ingot is completely solidified, the first-melting ingot is flipped and remelted at least 4 times to obtain a rare earth copper chromium zirconium alloy ingot.

[0024] Step 2: The rare earth copper-chromium-zirconium alloy ingot is subjected to solution treatment at a temperature of 950~1000℃ for 0.5~2h to obtain rare earth copper-chromium-zirconium alloy billet. The solution treatment method in step 2 is as follows: the rare earth copper-chromium-zirconium alloy ingot obtained in step 1 is wire-cut into blocks with a thickness of not less than 7 mm, and then placed in a quartz tube. After the quartz tube is subjected to multiple vacuuming and inert gas washing cycles, the vacuum degree inside the quartz tube is reduced to (7~8)*10E-4 Pa and then vacuum-sealed. Subsequently, the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot is placed in an annealing furnace and held at 950~1000℃ for 0.5~2 h. Then, it is water-quenched to obtain the rare earth copper-chromium-zirconium alloy billet.

[0025] Step 3: The rare earth copper-chromium-zirconium alloy billet is cold-rolled, with a total deformation of 75-85%; The cold rolling process in step 3 is as follows: the rare earth copper-chromium-zirconium alloy billet after solution treatment in step 2 is rolled at room temperature at 75-85%.

[0026] Step 4: The cold-rolled rare earth copper-chromium-zirconium alloy billet is aged at 440~460℃ for 1~2.5h, followed by water quenching to obtain Cu-Cr-Zr-Y-Sc alloy material.

[0027] The aging treatment method in step 4 is as follows: the rare earth copper-chromium-zirconium alloy billet after cold rolling in step 3 is placed in a quartz tube. After multiple cycles of vacuuming and inert gas washing, the vacuum degree inside the quartz tube is reduced to (7~8)*10E-4Pa and then vacuum-sealed. The tube is then placed in an annealing furnace and the aging temperature is maintained at 440~460℃ for 1~2.5h. Subsequently, it is water-quenched to obtain Cu-Cr-Zr-Y-Sc alloy material.

[0028] In the preparation method of the above-mentioned high-strength and high-conductivity rare-earth copper alloy, the reason for choosing to prepare an intermediate alloy instead of using elemental metals in step 1 is that the melting points of alloying elements such as Cr and Zr are much higher than those of the copper matrix. Direct addition can easily cause local overheating of the melt, compositional segregation, and element loss. By preparing an intermediate alloy, the melting temperature of the added elements can be significantly reduced, making them easier to uniformly integrate into the copper liquid and ensuring compositional uniformity. Rare earth elements Y, Sc, and Zr are chemically reactive. Direct addition to the melt in elemental form can easily react with oxygen and nitrogen, causing oxidation and loss, leading to inaccurate composition control. The intermediate alloy form can effectively reduce the exposed area of ​​reactive elements, inhibit oxidation, and significantly improve element yield, thereby achieving precise control of the alloy composition.

[0029] This invention utilizes the synergistic effect of Y and Sc elements, combined with "solid solution" Cold rolling The "aging" heat treatment route, a simple and efficient method, overcomes the problem of a sharp decrease in conductivity caused by the addition of Sc alone. While maintaining high conductivity (85% IACS), it achieves a better balance between strength, plasticity, and conductivity. Furthermore, the alloy exhibits excellent thermal stability with a softening temperature of no less than 600℃. With a tensile strength of 494MPa, a conductivity of 85% IACS, and an elongation of 14%, this alloy boasts outstanding advantages such as good overall performance, a short processing flow, low production cost, and suitability for large-scale production. It is suitable for applications such as high-performance lead frames, conductive contacts, and contact wires.

[0030] Example 1 A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: 1.5% Cr, 0.05% Zr, 0.0875% Y, 0.0125% Sc, with the balance being pure Cu and unavoidable impurities. The Cr, Zr, Y, and Sc elements are all added in the form of intermediate alloys.

[0031] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy material includes the following steps: Step 1: Using pure Cu, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-10Y master alloy, and Cu-10Sc master alloy as raw materials, each raw material was weighed according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.0875%Y, and 0.0125%Sc. The raw materials were then ultrasonically cleaned with alcohol and dried. Subsequently, the Cu-10Cr master alloy, pure Cu, Cu-10Sc master alloy, Cu-10Zr master alloy, and Cu-10Y master alloy were sequentially placed in a water-cooled copper crucible within a non-consumable vacuum arc melting furnace. A vacuum was then drawn to reduce the furnace chamber pressure to 1×10⁻⁶. - The current is 3Pa, and then smelting is carried out under the protection of argon atmosphere. The electric arc is started and the initial current is set to 120A. After the surface of the metal block appears to be in a molten state, the current is gradually increased in a step manner, with each stage increasing by 120A and held for 3s in each current stage, until the current reaches 480A. After the alloy is completely melted, the smelting current is maintained for 40s, and the electromagnetic stirring of the equipment is fully utilized to promote the homogenization of the alloy liquid composition, thereby providing a uniform composition and dense structure for subsequent processes. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-melting ingot. After the first-melting ingot is completely solidified, it is flipped and remelted 6 times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 8mm, place them in a quartz tube. After 5 cycles of vacuuming and argon gas washing, vacuum seal the quartz tube when the vacuum level inside the quartz tube drops to 7*10E-4Pa to reduce oxidation during the solid solution process. Then, place the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot in an annealing furnace and hold it at 960℃ for 2 hours. After that, water quench it to obtain the rare earth copper-chromium-zirconium alloy billet. The higher the solution temperature, the longer the holding time. Based on diffusion kinetics, there is an equivalent substitution relationship between temperature and time in solution treatment: increasing the temperature significantly enhances atomic diffusion, thereby shortening the time required to achieve the same solubility; conversely, at lower temperatures, the holding time needs to be extended to ensure sufficient solute dissolution and uniform composition. This parameter coordination aims to achieve optimal solution treatment while effectively suppressing excessive grain growth.

[0032] Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is rolled at 80% room temperature. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. After five cycles of vacuuming and inert gas purging, vacuum seal the tube once the vacuum level drops to 7*10E-4 Pa. Then, place it in an annealing furnace and maintain the aging temperature at 450℃ for 2.5 hours, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.0875Y-0.0125Sc alloy material.

[0033] The Cu prepared in this embodiment 1.5Cr The 0.05Zr-0.0875Y-0.0125Sc alloy has good comprehensive properties, with a tensile strength of 494MPa, an electrical conductivity of 85% IACS, a fracture elongation of 14%, and a softening temperature ≥600℃.

[0034] Example 2 A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: 1.5% Cr, 0.05% Zr, 0.0875% Y, 0.0125% Sc, with the balance being pure Cu and unavoidable impurities. The Cr, Zr, Y, and Sc elements are all added in the form of intermediate alloys.

[0035] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy material includes the following steps: Step 1: Using pure Cu, Cu-15Cr master alloy, Cu-15Zr master alloy, Cu-15Y master alloy, and Cu-15Sc master alloy as raw materials, each raw material was weighed according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.0875%Y, and 0.0125%Sc. The raw materials were then ultrasonically cleaned with alcohol and dried. Subsequently, the Cu-15Cr master alloy, pure Cu, Cu-15Sc master alloy, Cu-15Zr master alloy, and Cu-15Y master alloy were sequentially placed in a water-cooled copper crucible within a non-consumable vacuum arc melting furnace. A vacuum was then drawn to reduce the furnace chamber pressure to 1.2 × 10⁻⁶. - The current is 3Pa, and then smelting is carried out under the protection of argon atmosphere. The electric arc is started and the initial current is set to 100 A. After the surface of the metal block appears to be in a molten state, the current is gradually increased in a step manner, with each stage increasing by 80 A and held for 3 seconds in each current stage, until the current reaches 500 A. After the alloy is completely melted, the smelting current is maintained for 45 seconds, and the equipment's own electromagnetic stirring is fully utilized to promote the homogenization of the alloy liquid composition, thereby providing a uniform composition and dense structure for subsequent processes. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-melting ingot. After the first-melting ingot is completely solidified, it is flipped and remelted 6 times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 8.5 mm, place them in a quartz tube. After the quartz tube is evacuated and purged with argon gas four times, vacuum sealing is performed after the vacuum degree inside the quartz tube drops to 7.2*10E-4 Pa to reduce oxidation during the solid solution process. Then, the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot is placed in an annealing furnace and held at 1000℃ for 0.5 h. After that, it is water quenched to obtain the rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is rolled at 78% room temperature. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. After four cycles of vacuuming and inert gas purging, vacuum sealing is performed once the vacuum level inside the quartz tube drops to 7.5 × 10⁻⁴ Pa. The tube is then placed in an annealing furnace and maintained at an aging temperature of 450℃ for 1 hour, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.0875Y-0.0125Sc alloy material.

[0036] The Cu prepared in this embodiment 1.5Cr The 0.05Zr-0.0875Y-0.0125Sc alloy has good comprehensive properties, with a tensile strength of 482MPa, an electrical conductivity of 85% IACS, a fracture elongation of 13.5%, and a softening temperature ≥600℃.

[0037] Example 3 A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: 1.5% Cr, 0.05% Zr, 0.05% Y, 0.05% Sc, with the balance being pure Cu and unavoidable impurities. The Cr, Zr, Y, and Sc elements are all added in the form of intermediate alloys.

[0038] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy material includes the following steps: Step 1: Using pure Cu, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-10Y master alloy, and Cu-10Sc master alloy as raw materials, weigh each raw material according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.05%Y, and 0.05%Sc. Clean the raw materials with alcohol using ultrasonication and dry them. Then, place the Cu-10Cr master alloy, pure Cu, Cu-10Sc master alloy, Cu-10Zr master alloy, and Cu-10Y master alloy sequentially into a water-cooled copper crucible in a non-consumable vacuum arc melting furnace. Evacuate the furnace to reduce the furnace pressure to 1.1 × 10⁻⁶. - The melting process begins with an argon atmosphere: the electric arc is started with an initial current of 80 A. Once the surface of the metal block appears molten, the current is gradually increased in steps, with each step increasing by 100 A and held for 4 seconds, until the current reaches 480 A. After the alloy is completely melted, the melting current is maintained for 50 seconds, and the equipment's built-in electromagnetic stirring is fully utilized to homogenize the alloy composition, thus providing a uniformly composed and dense ingot for subsequent processes. Then, the current is slowly reduced to its lowest setting, allowing the melt to solidify in a water-cooled copper crucible, resulting in a first-stage melting ingot. After the first-stage melting ingot has completely solidified, it is flipped and remelted five times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 9mm, place them in a quartz tube and perform three cycles of vacuuming and argon gas washing on the quartz tube. After the vacuum degree inside the quartz tube drops to 7.3*10E-4Pa, vacuum seal the tube to ensure that oxidation is reduced during the solid solution process. Then, place the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot in an annealing furnace and hold it at 960℃ for 2 hours. Then, water quench it to obtain the rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is subjected to 81% room temperature rolling. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. Perform three cycles of vacuuming and inert gas purging on the quartz tube. After the vacuum level inside the quartz tube drops to 7.3*10E-4 Pa, vacuum seal the tube. Then place it in an annealing furnace, maintaining the aging temperature at 450℃ for 2 hours, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.05Y-0.05Sc alloy material.

[0039] The Cu prepared in this embodiment 1.5Cr The 0.05Zr-0.05Y-0.05Sc alloy has good comprehensive properties, with a tensile strength of 482~486MPa, an electrical conductivity of 84% IACS, a fracture elongation of 12~13%, and a softening temperature ≥600℃.

[0040] Example 4 A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: 1.5% Cr, 0.05% Zr, 0.09% Y, 0.01% Sc, with the balance being pure Cu and unavoidable impurities. The Cr, Zr, Y, and Sc elements are all added in the form of intermediate alloys.

[0041] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy material includes the following steps: Step 1: Using pure Cu, Cu-20Cr master alloy, Cu-20Zr master alloy, Cu-20Y master alloy, and Cu-15Sc master alloy as raw materials, each raw material was weighed according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.09%Y, and 0.01%Sc. The raw materials were then ultrasonically cleaned with alcohol and dried. Subsequently, the Cu-20Cr master alloy, pure Cu, Cu-15Sc master alloy, Cu-20Zr master alloy, and Cu-20Y master alloy were sequentially placed in a water-cooled copper crucible within a non-consumable vacuum arc melting furnace. A vacuum was then drawn to reduce the furnace chamber pressure to 2 × 10⁻⁶. -The current is increased to 3Pa, and then smelted under an argon atmosphere. The electric arc is started with an initial current of 150A. After the surface of the metal block appears molten, the current is gradually increased in steps, with each step increasing by 100A and held for 5 seconds, until the current reaches 450A. After the alloy is completely melted, the smelting current is maintained for 60 seconds, and the equipment's own electromagnetic stirring is fully utilized to promote the homogenization of the alloy liquid composition, thereby providing a uniform and dense ingot for subsequent processes. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-stage smelting ingot. After the first-stage smelting ingot is completely solidified, it is flipped and remelted four times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 8.8 mm, place them in a quartz tube. After 5 cycles of vacuuming and argon gas washing, vacuum sealing is performed when the vacuum degree inside the quartz tube drops to 8*10E-4 Pa to reduce oxidation during the solid solution process. Then, the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot is placed in an annealing furnace and held at 950℃ for 2 hours. After that, it is water quenched to obtain the rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is rolled at 75% room temperature. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. After five cycles of vacuuming and inert gas purging, vacuum seal the tube once the vacuum level drops to 8*10E-4 Pa. Then, place it in an annealing furnace and maintain the aging temperature at 440℃ for 2.5 hours, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.09Y-0.01Sc alloy material.

[0042] The Cu prepared in this embodiment 1.5Cr The 0.05Zr-0.09Y-0.01Sc alloy has good comprehensive properties, with a tensile strength of 475~478MPa, an electrical conductivity of 85.4% IACS, a fracture elongation of 12.8~15%, and a softening temperature ≥600℃.

[0043] Example 5 A rare earth Y and Sc doped Cu-Cr-Zr alloy material, by mass percentage, comprises: 1.5% Cr, 0.05% Zr, 0.075% Y, 0.025% Sc, with the balance being pure Cu and unavoidable impurities. The Cr, Zr, Y, and Sc elements are all added in the form of intermediate alloys.

[0044] A method for preparing rare earth Y and Sc doped Cu-Cr-Zr alloy material includes the following steps: Step 1: Using pure Cu, Cu-20Cr master alloy, Cu-40Zr master alloy, Cu-20Y master alloy, and Cu-20Sc master alloy as raw materials, each raw material was weighed according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.075%Y, and 0.025%Sc. The raw materials were then ultrasonically cleaned with acetone and dried. Subsequently, the Cu-20Cr master alloy, pure Cu, Cu-20Sc master alloy, Cu-40Zr master alloy, and Cu-20Y master alloy were sequentially placed in a water-cooled copper crucible within a non-consumable vacuum arc melting furnace. A vacuum was then drawn to reduce the furnace pressure to 1×10⁻⁶. - The current is increased to 3Pa, and then smelted under an argon atmosphere. The electric arc is started with an initial current of 100A. After the surface of the metal block appears molten, the current is gradually increased in steps, with each step increasing by 120A and held for 4 seconds, until the current reaches 460A. After the alloy is completely melted, the smelting current is maintained for 60 seconds, and the equipment's own electromagnetic stirring is fully utilized to promote the homogenization of the alloy liquid composition, thereby providing a uniform and dense ingot for subsequent processes. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-stage smelting ingot. After the first-stage smelting ingot is completely solidified, it is flipped and remelted 5 times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 9mm, place them in a quartz tube. After 4 cycles of vacuuming and argon gas washing, vacuum seal the quartz tube when the vacuum level inside the quartz tube drops to 8*10E-4Pa to reduce oxidation during the solid solution process. Then, place the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot in an annealing furnace and hold it at 980℃ for 1.5h. After that, water quench the ingot to obtain the rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is rolled at 85% room temperature. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. Perform four cycles of vacuuming and inert gas purging on the quartz tube. After the vacuum level inside the quartz tube drops to 7.1*10E-4 Pa, vacuum seal the tube. Then place it in an annealing furnace, maintaining the aging temperature at 460℃ for 1 hour, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.075Y-0.025Sc alloy material.

[0045] The Cu prepared in this embodiment 1.5Cr The 0.05Zr-0.075Y-0.025Sc alloy has good comprehensive properties, with a tensile strength of 479~483MPa, an electrical conductivity of 83.2% IACS, a fracture elongation of 14.8~17.3%, and a softening temperature ≥600℃.

[0046] Comparative Example 1 The difference between Comparative Example 1 and Example 3 is that the prepared copper-chromium-zirconium alloy does not contain rare earth elements. Its composition, by mass percentage, is: 1.5% Cr, 0.05% Zr, with the remainder being pure Cu and unavoidable impurities. The remaining preparation conditions are exactly the same as in Example 3.

[0047] The Cu prepared in Comparative Example 1 1.5Cr The 0.05Zr alloy has a tensile strength of 450~456MPa, an electrical conductivity of 87.7% IACS, and an elongation at break of 13.5~16.5%.

[0048] Comparative Example 2 The difference between Comparative Example 2 and Example 3 is that the prepared copper-chromium-zirconium alloy contains only 0.05% Sc. Its composition by mass percentage is: 1.5% Cr, 0.05% Zr, 0.05% Sc, with the remainder being pure Cu and unavoidable impurities. The remaining preparation conditions are exactly the same as in Example 3.

[0049] The Cu prepared in Comparative Example 2 1.5Cr The 0.05Zr-0.05Sc alloy has a tensile strength of 466~470MPa, an electrical conductivity of 85.6% IACS, and an elongation at break of 10.5~11%.

[0050] Comparative Example 3 The difference between Comparative Example 3 and Example 3 is that the prepared copper-chromium-zirconium alloy contains only 0.075% Sc. Its composition by mass percentage is: 1.5% Cr, 0.05% Zr, 0.075% Sc, with the remainder being pure Cu and unavoidable impurities. The remaining preparation conditions are exactly the same as in Example 3.

[0051] The Cu prepared in Comparative Example 3 1.5Cr The 0.05Zr-0.075Sc alloy has a tensile strength of 506~524MPa, an electrical conductivity of 77.8% IACS, and an elongation at break of 12~16%.

[0052] Comparative Example 4 The difference between Comparative Example 4 and Example 3 is that the prepared copper-chromium-zirconium alloy contains only 0.1% Sc. Its composition by mass percentage is: 1.5% Cr, 0.05% Zr, 0.1% Sc, with the remainder being pure Cu and unavoidable impurities. The remaining preparation conditions are exactly the same as in Example 3.

[0053] The Cu prepared in Comparative Example 4 1.5Cr The 0.05Zr-0.1Sc alloy has a tensile strength of 491~520MPa, an electrical conductivity of 79.4% IACS, and an elongation at break of 14~16.5%.

[0054] Comparative Example 5 The difference between Comparative Example 5 and Example 3 is that the prepared copper-chromium-zirconium alloy contains only 0.05% Y. Its composition by mass percentage is: 1.5% Cr, 0.05% Zr, 0.05% Y, with the remainder being pure Cu and unavoidable impurities. The remaining preparation conditions are exactly the same as in Example 3.

[0055] The Cu prepared in Comparative Example 5 1.5Cr The 0.05Zr-0.05Y alloy has a tensile strength of 457~459MPa, an electrical conductivity of 87.3% IACS, and an elongation at break of 12~14%.

[0056] Figure 1 Comparison of the properties of Cu-Cr-Zr alloys with no rare earth elements, only Y element, only Sc element, and combined Y and Sc elements.

[0057] like Figure 1 As shown, by comparing and analyzing the performance data of all embodiments and comparative examples, the following conclusions can be drawn: For Cu-Cr-Zr alloys without any rare earth elements, although the electrical conductivity is high (87.7% IACS), the tensile strength is low, only about 450 MPa. Adding 0.05 wt.% Sc alone has no significant strengthening effect, and the tensile strength is not noticeably improved; while further increasing the Sc content significantly improves the strength, it leads to a sharp decrease in electrical conductivity. On the other hand, adding only rare earth Y has a small effect on electrical conductivity, but its effect on improving strength is still limited.

[0058] This invention achieves this effect by synergistically adding Y and Sc elements, using conventional "solid solution" methods. Cold rolling Under the "aging" process, the alloy simultaneously possesses high tensile strength and high electrical conductivity, effectively overcoming the problem of significant conductivity reduction caused by the addition of Sc alone, and achieving an excellent match between strength and conductivity. In addition, the alloy exhibits a softening temperature of not less than 600℃, demonstrating excellent thermal stability.

[0059] It is worth emphasizing that, regardless of whether rare earth elements are not added, Y or Sc elements are added alone, or Y and Sc elements are added together, the elongation of all Cu-Cr-Zr alloys remains above 10%, indicating that the present invention can maintain good plasticity while achieving high strength and high conductivity. Figure 2 and Figure 3 The images show the microstructures of Cu-1.5Cr-0.05Zr in Comparative Example 1 and Cu-1.5Cr-0.05Zr-0.0875Y-0.0125Sc in Example 1, respectively. A comparison reveals that... Figure 2 In Cu-1.5Cr-0.05Zr without the combined addition of Y and Sc, the precipitates are large in size and sparsely distributed, offering limited resistance to dislocation slip in the matrix. Simultaneously, due to the small number and large size of the precipitates, the scattering effect on the free electron movement in the copper matrix is ​​weak, resulting in a high conductivity (87.7% IACS). However, as... Figure 3 The combined addition of Y and Sc elements promoted finer, more dispersed precipitates. These densely distributed second phases more effectively hindered dislocation movement and refined the copper matrix grains. Through the synergistic effect of precipitation strengthening and grain refinement strengthening, the strength was improved. However, on the other hand, more and finer second phases increased the scattering centers of free electrons, hindering the directional movement of electrons, resulting in a decrease in conductivity to 85% IACS. Compared with the conductivity of Comparative Example 4 after adding 0.1% Sc element by mass alone (<80% IACS), the conductivity loss after adding a total of 0.1% Y and Sc elements by mass was smaller, and it still remained at a high level (≥83% IACS).

[0060] The specific embodiments described above are merely illustrative examples of the technical solutions of the present invention and are not intended to limit the scope of protection thereof. Any modifications or equivalent substitutions made by those skilled in the art within the core principles and essential spirit disclosed in the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rare earth Y and Sc doped Cu-Cr-Zr alloy material, characterized in that, By mass percentage, its composition includes: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance being pure Cu and unavoidable impurities.

2. The rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 1, characterized in that, The Cr, Zr, Y, and Sc are added in the form of Cu-Cr master alloy, Cu-Zr master alloy, Cu-Y master alloy, and Cu-Sc master alloy, respectively.

3. A method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material, characterized in that, Includes the following steps: Step 1: Using pure Cu, Cu-Cr master alloy, Cu-Zr master alloy, Cu-Y master alloy, and Cu-Sc master alloy as raw materials, weigh the different components according to the following mass percentages in the final alloy: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance Cu. Ultrasonically clean and dry the prepared raw materials, and then melt them through vacuum arc melting to obtain rare earth copper-chromium-zirconium alloy ingots. Step 2: The rare earth copper-chromium-zirconium alloy ingot is subjected to solution treatment at a temperature of 950~1000℃ for 0.5~2h to obtain rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet is cold-rolled, with a total deformation of 75-85%; Step 4: The cold-rolled rare earth copper-chromium-zirconium alloy billet is aged at 440~460℃ for 1~2.5h, followed by water quenching to obtain Cu-Cr-Zr-Y-Sc alloy material.

4. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, In step 1, the mass percentage of Cr in the Cu-Cr master alloy is 10-20%; the mass percentage of Zr in the Cu-Zr master alloy is 10-40%; the mass percentage of Y in the Cu-Y master alloy is 10-20%; and the mass percentage of Sc in the Cu-Sc master alloy is 10-20%.

5. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, The smelting method in step 1 is as follows: According to the mass percentages of the different components in the final alloy: Cr: 1.5%, Zr: 0.05%, Y: 0.05~0.09%, Sc: 0.01~0.05%, with the balance being pure Cu, the Cu-Cr master alloy, pure Cu, Cu-Sc master alloy, Cu-Zr master alloy, and Cu-Y master alloy are sequentially placed in a water-cooled copper crucible of a non-consumable vacuum arc melting furnace. A vacuum is then drawn to reduce the furnace chamber pressure to 1×10⁻⁶. - ³~2×10 - The melting process is carried out under an inert atmosphere: the electric arc is started, and the initial current is set to 80~150 A. After the surface of the metal block appears to be molten, the current is gradually increased in a stepwise manner, with each stage increasing by 80~120 A and held for 3~5 seconds in each stage, until the current reaches 450~500 A. After the alloy is completely melted, the melting current is maintained for 40~60 seconds, and electromagnetic stirring is used to promote the full homogenization of the alloy liquid composition. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-stage melting ingot. After the first-stage melting ingot is completely solidified, it is flipped and remelted at least 4 times to obtain a rare earth copper-chromium-zirconium alloy ingot.

6. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, The solution treatment method in step 2 is as follows: the rare earth copper-chromium-zirconium alloy ingot obtained in step 1 is wire-cut into blocks with a thickness of not less than 7 mm, and then placed in a quartz tube. After the quartz tube is subjected to multiple vacuuming and inert gas washing cycles, the vacuum degree inside the quartz tube is reduced to (7~8)*10E-4 Pa and then vacuum-sealed. Subsequently, the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot is placed in an annealing furnace and held at 950~1000℃ for 0.5~2 h. Then, it is water-quenched to obtain the rare earth copper-chromium-zirconium alloy billet.

7. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, The cold rolling process in step 3 is as follows: the rare earth copper-chromium-zirconium alloy billet after solution treatment in step 2 is rolled at room temperature at 75-85%.

8. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, The aging treatment method in step 4 is as follows: the rare earth copper-chromium-zirconium alloy billet after cold rolling in step 3 is placed in a quartz tube, and the quartz tube is subjected to multiple vacuuming and inert gas washing cycles. After the vacuum degree inside the quartz tube drops to (7~8)*10E-4Pa, the tube is vacuum sealed, and then placed in an annealing furnace, maintaining the temperature at 440~460℃ for 1~2.5h. Subsequently, it is water quenched to obtain Cu-Cr-Zr-Y-Sc alloy material.

9. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, Includes the following steps: Step 1: Using pure Cu, Cu-10Cr master alloy, Cu-10Zr master alloy, Cu-10Y master alloy, and Cu-10Sc master alloy as raw materials, each raw material was weighed according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.0875%Y, and 0.0125%Sc. The raw materials were then ultrasonically cleaned with alcohol and dried. Subsequently, the Cu-10Cr master alloy, pure Cu, Cu-10Sc master alloy, Cu-10Zr master alloy, and Cu-10Y master alloy were sequentially placed in a water-cooled copper crucible within a non-consumable vacuum arc melting furnace. A vacuum was then drawn to reduce the furnace chamber pressure to 1×10⁻⁶. - The current is 3Pa, and then smelting is carried out under the protection of argon atmosphere. The electric arc is started and the initial current is set to 120A. After the surface of the metal block appears to be in a molten state, the current is gradually increased in a step manner, with each stage increasing by 120A and held for 3s in each current stage, until the current reaches 480A. After the alloy is completely melted, the smelting current is maintained for 40s, and the electromagnetic stirring of the equipment is fully utilized to promote the homogenization of the alloy liquid composition, thereby providing a uniform composition and dense structure for subsequent processes. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-melting ingot. After the first-melting ingot is completely solidified, it is flipped and remelted 6 times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 8mm, place them in a quartz tube. After 5 cycles of vacuuming and argon gas washing, vacuum seal the quartz tube when the vacuum level inside the quartz tube drops to 7*10E-4Pa to reduce oxidation during the solid solution process. Then, place the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot in an annealing furnace and hold it at 960℃ for 2 hours. After that, water quench it to obtain the rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is rolled at 80% room temperature. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. After five cycles of vacuuming and inert gas purging, vacuum seal the tube once the vacuum level drops to 7*10E-4 Pa. Then, place it in an annealing furnace and maintain the aging temperature at 450℃ for 2.5 hours, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.0875Y-0.0125Sc alloy material.

10. The method for preparing a rare earth Y and Sc doped Cu-Cr-Zr alloy material according to claim 3, characterized in that, Includes the following steps: Step 1: Using pure Cu, Cu-15Cr master alloy, Cu-15Zr master alloy, Cu-15Y master alloy, and Cu-15Sc master alloy as raw materials, each raw material was weighed according to the following mass percentages: 1.5%Cr, 0.05%Zr, 0.0875%Y, and 0.0125%Sc. The raw materials were then ultrasonically cleaned with alcohol and dried. Subsequently, the Cu-15Cr master alloy, pure Cu, Cu-15Sc master alloy, Cu-15Zr master alloy, and Cu-15Y master alloy were sequentially placed in a water-cooled copper crucible within a non-consumable vacuum arc melting furnace. A vacuum was then drawn to reduce the furnace chamber pressure to 1.2 × 10⁻⁶. - The current is 3Pa, and then smelting is carried out under the protection of argon atmosphere. The electric arc is started and the initial current is set to 100 A. After the surface of the metal block appears to be in a molten state, the current is gradually increased in a step manner, with each stage increasing by 80 A and held for 3 seconds in each current stage, until the current reaches 500 A. After the alloy is completely melted, the smelting current is maintained for 45 seconds, and the equipment's own electromagnetic stirring is fully utilized to promote the homogenization of the alloy liquid composition, thereby providing a uniform composition and dense structure for subsequent processes. Then, the current is slowly adjusted to the minimum, and the melt is solidified in a water-cooled copper crucible to obtain a first-melting ingot. After the first-melting ingot is completely solidified, it is flipped and remelted 6 times to obtain a rare earth copper-chromium-zirconium alloy ingot. Step 2: After wire cutting the rare earth copper-chromium-zirconium alloy ingot obtained in Step 1 into blocks with a thickness of 8.5 mm, place them in a quartz tube. After the quartz tube is evacuated and purged with argon gas four times, vacuum sealing is performed after the vacuum degree inside the quartz tube drops to 7.2*10E-4 Pa to reduce oxidation during the solid solution process. Then, the quartz tube containing the rare earth copper-chromium-zirconium alloy ingot is placed in an annealing furnace and held at 1000℃ for 0.5 h. After that, it is water quenched to obtain the rare earth copper-chromium-zirconium alloy billet. Step 3: The rare earth copper-chromium-zirconium alloy billet after solution treatment in Step 2 is rolled at 78% room temperature. Step 4: Place the cold-rolled rare earth copper-chromium-zirconium alloy billet from Step 3 into a quartz tube. After four cycles of vacuuming and inert gas purging, vacuum sealing is performed once the vacuum level inside the quartz tube drops to 7.5 × 10⁻⁴ Pa. The tube is then placed in an annealing furnace and maintained at an aging temperature of 450℃ for 1 hour, followed by water quenching to obtain Cu. 1.5Cr 0.05Zr-0.0875Y-0.0125Sc alloy material.

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