High-strength conductive Cu-Sn-Ti-Cr-Y alloy and preparation method thereof

Abstract

The application belongs to the technical field of copper alloy materials, and relates to a high-strength conductive Cu-Sn-Ti-Cr-Y alloy and a preparation method thereof. The alloy raw material composition comprises, in percentage by weight, Sn: 2.3-2.6%, Ti: 0.8-1.2%, Cr: 0.21-0.25%, and Y: 0.037-0.042%. The preparation method of the alloy comprises the following steps: S1. configuring alloy raw materials; S2. preparing Cu-10% Sn intermediate alloy and Cu-10% Ti intermediate alloy; S3. obtaining alloy melt by vacuum smelting the alloy raw materials; S4. pouring the alloy melt into a mold, and obtaining alloy ingot after cooling; and S5. performing solid solution, cold rolling and aging treatment on the alloy ingot. The application improves the strength and conductivity of the alloy by designing element components, aging and precipitating second-phase particles, and simultaneously reducing the solute atom concentration in the matrix. The preparation process of the application is simple, the process flow is short, and the problem of poor conductivity of the Cu-Ti alloy is solved.

Description

Technical Field

[0001] This invention belongs to the field of copper alloy materials technology, and specifically relates to a high-strength conductive Cu-Sn-Ti-Cr-Y alloy and its preparation method. Background Technology

[0002] Copper alloys, as the core of conductor materials, are widely used in lead frames for large-scale integrated circuits in industries such as electronics and information, overhead conductors for high-speed rail transportation, resistance welding electrodes for new energy vehicles, switch contact bridges for electrical engineering, and various wires. These critical applications require copper alloys to maintain high conductivity while possessing high strength and wear resistance, thereby extending the lifespan of conductor materials.

[0003] Beryllium copper alloy is a typical age-hardening copper alloy, an ideal ultra-high-strength and conductive copper alloy with excellent tensile strength, wear resistance, and corrosion resistance, and is widely used in the electronics industry. However, when beryllium bronze is smelted under non-vacuum conditions, beryllium is easily oxidized, and the resulting oxides can cause harm to the human body, limiting the application areas of beryllium copper. Countries worldwide are searching for and developing new copper alloys with performance comparable to or even superior to beryllium copper alloys, while also being environmentally friendly and harmless. Cu-Ti alloy is similar to beryllium copper alloy, belonging to the age-hardening precipitation-strengthened alloy category and possessing similar mechanical properties. Furthermore, Cu-Ti alloy has low production costs and is pollution-free, making it a promising candidate material to replace beryllium copper alloy. Although Cu-Ti alloy has excellent mechanical properties, its poor electrical conductivity makes it difficult to meet the requirements of high strength and high conductivity. Therefore, improving the electrical conductivity of Cu-Ti alloy while maintaining its excellent mechanical properties is a key research direction for the development and application of this alloy.

[0004] Chinese invention patent application CN 116607046 A discloses a Cu-Y-Ti copper-based composite material for electro-vacuum devices and its preparation method. The prepared Cu-Y-Ti copper-based composite material not only significantly improves the material's strength and resistance to softening, but the addition of rare earth element Y effectively eliminates coarse second phases, which are mainly distributed at grain boundaries and within grains, thus refining the grains and improving the microstructure of the copper alloy. However, the preparation method disclosed in this patent is complex, has a long process flow, and high preparation costs. Furthermore, the obtained Cu-Y-Ti alloy has relatively low strength, with a maximum tensile strength of only 312 MPa. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a high-strength, high-conductivity Cu-Sn-Ti-Cr-Y alloy. By adding rare earth elements Y and Sn to the alloy, the precipitation of the CuSn3Ti5 phase during aging is promoted, thereby increasing the alloy's strength. Simultaneously, the Ti content in the Cu matrix is ​​reduced, weakening electron scattering and improving the alloy's conductivity. The addition of Cr promotes the precipitation of Cr-containing phases, hindering dislocation movement and thus increasing the alloy's strength. This achieves both improved conductivity and maintained ultra-high strength in the copper alloy.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a high-strength conductive Cu-Sn-Ti-Cr-Y alloy, wherein the alloy raw material composition by weight percentage is Sn: 2.3-2.6%, Ti: 0.8-1.2%, Cr: 0.21-0.25%, Y: 0.037-0.042%, and the balance is Cu.

[0008] This invention also provides a method for preparing a high-strength, conductive Cu-Sn-Ti-Cr-Y alloy, comprising the following steps:

[0009] Step S1, Ingredient preparation: Prepare alloy raw materials according to the above alloy raw material composition;

[0010] Step S2, Preparation of intermediate alloy: Copper and tin are placed in a vacuum non-consumable arc melting furnace at a weight ratio of 9:1, and the furnace is evacuated to a pressure of 5 × 10⁻⁶. 2 The pressure was then increased to 0.05 MPa by introducing argon gas, and the furnace was heated to 1050–1100 °C for 0.5–1 hour. After natural cooling, a Cu-10% Sn master alloy was obtained for later use. In this step, a vacuum was applied to a pressure of 5 × 10⁻⁶ MPa. 2 Pa is used to reduce the air content in the furnace and prevent the alloy from being oxidized; then argon gas is introduced as a protective atmosphere to protect the alloy from oxidation.

[0011] Copper and titanium were placed in a vacuum non-consumable arc melting furnace at a weight ratio of 9:1, and the furnace was evacuated to a pressure of 5 × 10⁻⁶. 2 Pa, then argon gas is introduced into the furnace to a pressure of 0.05 MPa, heated to 1050-1100℃, smelted for 0.5-1 h, and naturally cooled to obtain Cu-10%Ti master alloy for later use;

[0012] Step S3, Melting, Casting, and Descaling: The Cu-10%Sn master alloy, Cu-10%Ti master alloy, Cr, Y, and the balance Cu are melted in a vacuum medium-frequency melting furnace at 1200℃ for 1 hour. The melt is then cast into a sand mold and cooled to obtain an alloy ingot. The riser is removed from the ingot after demolding, and the surface oxide scale is machined off. The Cu-10%Sn master alloy, Cu-10%Ti master alloy, Cr, Y, and the balance Cu are placed in the melting furnace, and the furnace pressure is adjusted to 6 × 10⁻⁶. -3 The pressure is initially set to MPa, then argon gas is introduced until the furnace pressure reaches 0.05 MPa, at which point melting begins. This pressure ensures a low air content in the alloy, preventing oxidation. The purpose of introducing argon gas is to protect the molten alloy from oxidation.

[0013] Step S4, solution treatment: The alloy sample is kept at 950℃ for 2 hours, then removed and water-quenched.

[0014] Step S5, cold rolling deformation: The alloy sample is subjected to cold rolling deformation, with a deformation amount of 50%;

[0015] Step S6, aging treatment: The alloy sample after cold rolling in step S5 is aged at 400-550℃ for 10-480 min.

[0016] The present invention has the following beneficial effects:

[0017] The alloy of this invention undergoes cold rolling deformation treatment, resulting in severe plastic deformation and strengthening the copper matrix. The addition of rare earth element Y promotes the formation of fine recrystallized grains during recrystallization, improving the alloy's strength. Furthermore, it promotes the dispersed precipitation of a large number of nano-sized CuSn3Ti5 phases during aging treatment, generating a second-phase strengthening effect and further enhancing the alloy's strength. The reduction in dislocation density and the precipitation of the second phase during recrystallization lower the concentration of solute atoms in the alloy matrix, weakening electron scattering and thus maintaining the alloy's conductivity. This invention offers advantages such as a simple preparation process and a short process flow, enabling wider applications of copper alloys. Attached Figure Description

[0018] Figure 1 The microstructure of the Cu-Sn-Ti-Cr-Y alloy prepared in Example 1 of this invention is shown in the TEM dark field image. Detailed Implementation

[0019] The present invention will now be described in more detail through specific embodiments to facilitate understanding of the technical solution of the present invention, but this is not intended to limit the scope of protection of the present invention.

[0020] Example 1

[0021] A method for preparing a high-strength, electrically conductive Cu-Sn-Ti-Cr-Y alloy, comprising:

[0022] Step S1: According to the composition of the alloy raw materials, weigh 0.175 kg of tin block, 0.07 kg of titanium block, 0.0175 kg of chromium block, 0.0028 kg of yttrium block and 6.7347 kg of copper block, with a total weight of 7 kg.

[0023] Step S2, Preparation of intermediate alloy: Place 1.575 kg of copper ingot and 0.175 kg of tin ingot into a vacuum non-consumable arc melting furnace, and evacuate the furnace to a pressure of 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain Cu-10% Sn master alloy for later use.

[0024] Place 0.63 kg of copper and 0.07 kg of titanium into a vacuum non-consumable arc melting furnace, and evacuate the furnace until the pressure inside the furnace is 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain a Cu-10%Ti master alloy for later use.

[0025] Step S3, Melting, Casting, and Scale Removal: Place the Cu-10%Sn master alloy, Cu-10%Ti master alloy, chromium ingot, yttrium ingot, and remaining copper ingot into a vacuum medium-frequency melting furnace, and adjust the furnace pressure to 6 × 10⁻⁶. -3 The pressure was increased to MPa, and then argon gas was introduced into the furnace to a pressure of 0.05 MPa. The alloy melt was obtained by melting at a temperature of 1200℃ for 1 hour. The alloy melt was then poured into a sand mold and cooled to obtain an alloy ingot. The riser of the alloy ingot was removed and the surface oxide scale was machined off.

[0026] Step S4: In a vacuum tube furnace, under argon protection, the alloy is solution treated at 950°C for 2 hours. After the solution treatment is completed, the alloy is removed and water-quenched.

[0027] Step S5: The alloy is subjected to cold rolling with a deformation amount of 50%.

[0028] Step S6, aging at 450℃ for 60 min, yields the Cu-Sn-Ti-Cr-Y alloy. The microstructure is shown below. Figure 1 ,Depend on Figure 1 It can be seen that a large number of nanoscale precipitates are formed in the alloy.

[0029] Example 2

[0030] A method for preparing a high-strength, electrically conductive Cu-Sn-Ti-Cr-Y alloy, comprising:

[0031] Step S1: Weigh out 0.175 kg of tin, 0.035 kg of titanium, 0.0175 kg of chromium, 0.0028 kg of yttrium, and 6.7697 kg of copper according to the alloy raw material composition.

[0032] Step S2, Preparation of intermediate alloy: Place 1.575 kg of copper ingot and 0.175 kg of tin ingot into a vacuum non-consumable arc melting furnace, and evacuate the furnace to a pressure of 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain Cu-10% Sn master alloy for later use.

[0033] Place 0.315 kg of copper and 0.035 kg of titanium into a vacuum non-consumable arc melting furnace, and evacuate the furnace until the pressure inside the furnace is 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain a Cu-10%Ti master alloy for later use.

[0034] Step S3, Melting, Casting, and Scale Removal: Place the Cu-10%Sn master alloy, Cu-10%Ti master alloy, chromium ingot, yttrium ingot, and remaining copper ingot into a vacuum medium-frequency melting furnace, and adjust the furnace pressure to 6 × 10⁻⁶. -3 The pressure was increased to MPa, and then argon gas was introduced into the furnace to a pressure of 0.05 MPa. The alloy melt was obtained by melting at a temperature of 1200℃ for 1 hour. The alloy melt was then poured into a sand mold and cooled to obtain an alloy ingot. The riser of the alloy ingot was removed and the surface oxide scale was machined off.

[0035] Step S4: In a vacuum tube furnace, under argon protection, the alloy is solution treated at 950°C for 2 hours. After the solution treatment is completed, the alloy is removed and water-quenched.

[0036] Step S5: The alloy is subjected to cold rolling with a deformation amount of 50%.

[0037] Step S6, aging at 450℃ for 60 minutes, yields the Cu-Sn-Ti-Cr-Y alloy.

[0038] Example 3

[0039] A method for preparing a high-strength, electrically conductive Cu-Sn-Ti-Cr-Y alloy, comprising:

[0040] Step S1: According to the composition of the alloy raw materials, weigh 0.175 kg of tin block, 0.07 kg of titanium block, 0.0175 kg of chromium block, 0.0028 kg of yttrium block and 6.7347 kg of copper block, with a total mass of 7 kg.

[0041] Step S2, Preparation of intermediate alloy: Place 1.575 kg of copper ingot and 0.175 kg of tin ingot into a vacuum non-consumable arc melting furnace, and evacuate the furnace to a pressure of 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain Cu-10% Sn master alloy for later use.

[0042] Place 0.63 kg of copper and 0.07 kg of titanium into a vacuum non-consumable arc melting furnace, and evacuate the furnace until the pressure inside the furnace is 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain a Cu-10%Ti master alloy for later use.

[0043] Step S3, Melting, Casting, and Scale Removal: Place the Cu-10%Sn master alloy, Cu-10%Ti master alloy, chromium ingot, yttrium ingot, and remaining copper ingot into a vacuum medium-frequency melting furnace, and adjust the furnace pressure to 6 × 10⁻⁶. -3 The pressure was increased to MPa, and then argon gas was introduced into the furnace to a pressure of 0.05 MPa. The alloy melt was obtained by melting at a temperature of 1200℃ for 1 hour. The alloy melt was then poured into a sand mold and cooled to obtain an alloy ingot. The riser of the alloy ingot was removed and the surface oxide scale was machined off.

[0044] Step S4: In a vacuum tube furnace, under argon protection, the alloy is solution treated at 950°C for 2 hours. After the solution treatment is completed, the alloy is removed and water-quenched.

[0045] Step S5: The alloy is subjected to cold rolling with a deformation amount of 50%.

[0046] Step S6, aging at 450℃ for 120 min, yields the Cu-Sn-Ti-Cr-Y alloy.

[0047] Example 4

[0048] A method for preparing a high-strength, electrically conductive Cu-Sn-Ti-Cr-Y alloy, comprising:

[0049] Step S1: According to the composition of the alloy raw materials, weigh 0.175 kg of tin block, 0.14 kg of titanium block, 0.0175 kg of chromium block, 0.0028 kg of yttrium block and 6.6647 kg of copper block, with a total weight of 7 kg.

[0050] Step S2, Preparation of intermediate alloy: Copper and tin are placed in a vacuum non-consumable arc melting furnace, and a vacuum is drawn until the furnace pressure is 5×10⁻⁶. 2Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain Cu-10% Sn master alloy for later use.

[0051] Copper and titanium were placed in a vacuum non-consumable arc melting furnace, and the furnace pressure was evacuated to 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain a Cu-10%Ti master alloy for later use.

[0052] Step S3, Melting, Casting, and Scale Removal: Place the Cu-10%Sn master alloy, Cu-10%Ti master alloy, chromium ingot, yttrium ingot, and remaining copper ingot into a vacuum medium-frequency melting furnace, and adjust the furnace pressure to 6 × 10⁻⁶. -3 The pressure was increased to MPa, and then argon gas was introduced into the furnace to a pressure of 0.05 MPa. The alloy melt was obtained by melting at a temperature of 1200℃ for 1 hour. The alloy melt was then poured into a sand mold and cooled to obtain an alloy ingot. The riser of the alloy ingot was removed and the surface oxide scale was machined off.

[0053] Step S4: In a vacuum tube furnace, under argon protection, the alloy is solution treated at 950°C for 2 hours. After the solution treatment is completed, the alloy is removed and water-quenched.

[0054] Step S5: The alloy is subjected to cold rolling with a deformation amount of 50%.

[0055] Step S6, aging at 450℃ for 60 minutes, yields the Cu-Sn-Ti-Cr-Y alloy.

[0056] Example 5

[0057] A method for preparing a high-strength, electrically conductive Cu-Sn-Ti-Cr-Y alloy, comprising:

[0058] Step S1: According to the composition of the alloy raw materials, weigh 0.175 kg of tin block, 0.07 kg of titanium block, 0.0175 kg of chromium block, 0.0028 kg of yttrium block and 6.7347 kg of copper block, with a total weight of 7 kg.

[0059] Step S2, Preparation of intermediate alloy: Place 1.575 kg of copper ingot and 0.175 kg of tin ingot into a vacuum non-consumable arc melting furnace, and evacuate the furnace to a pressure of 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain Cu-10% Sn master alloy for later use.

[0060] Place 0.63 kg of copper and 0.07 kg of titanium into a vacuum non-consumable arc melting furnace, and evacuate the furnace until the pressure inside the furnace is 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1100℃, smelted for 1 hour, and then naturally cooled to obtain a Cu-10%Ti master alloy for later use.

[0061] Step S3, Melting, Casting, and Scale Removal: Place the Cu-10%Sn master alloy, Cu-10%Ti master alloy, chromium ingot, yttrium ingot, and remaining copper ingot into a vacuum medium-frequency melting furnace, and adjust the furnace pressure to 6 × 10⁻⁶. -3 The pressure was increased to MPa, and then argon gas was introduced into the furnace to a pressure of 0.05 MPa. The alloy melt was obtained by melting at a temperature of 1200℃ for 1 hour. The alloy melt was then poured into a sand mold and cooled to obtain an alloy ingot. The riser of the alloy ingot was removed and the surface oxide scale was machined off.

[0062] Step S4: In a vacuum tube furnace, under argon protection, the alloy is solution treated at 950°C for 2 hours. After the solution treatment is completed, the alloy is removed and water-quenched.

[0063] Step S5: The alloy is subjected to cold rolling with a deformation amount of 50%.

[0064] Step S6, aging at 450℃ for 30 minutes, yields the Cu-Sn-Ti-Cr-Y alloy.

[0065] Comparative Example 1

[0066] The only difference between this comparative example and Example 1 is that the ingredients do not contain the element Y.

[0067] Comparative Example 2

[0068] The only difference between this comparative example and Example 1 is that the aging treatment temperature is 500°C.

[0069] Comparative Example 3

[0070] The only difference between this comparative example and Example 1 is that the aging treatment temperature is 500°C and the aging time is 30 minutes.

[0071] Comparative Example 4

[0072] The only difference between this comparative example and Example 1 is that the cold rolling deformation is 40%.

[0073] Comparative Example 5

[0074] The only difference between this comparative example and Example 1 is that the aging treatment temperature is 550°C.

[0075] The Cu-Sn-Ti-Cr-Y alloys prepared in Examples 1 to 5 and the alloy samples prepared in Comparative Examples 1 to 5 were subjected to hardness tests, electrical conductivity tests, and tensile property tests.

[0076] The hardness of the alloy samples was determined using an HVS-1000 Vickers hardness tester with a load of 500g and a holding time of 10s. Ten points were taken from each sample to ensure data accuracy. The electrical conductivity of the alloy samples was tested using a Singa 2008B1 digital conductivity meter, and the tensile strength of the alloy samples was determined using an AG-I-250kN tensile tester. The results are shown in Table 1.

[0077] Table 1. Performance test results of the examples and comparative examples.

[0078] Example 1 274.5 26.7 574.8 Example 2 253.7 24.6 536.1 Example 3 273.2 26.3 548.2 Example 4 287.1 22.3 604.8 Example 5 253.7 24.6 516.1 Comparative Example 1 241.4 23.5 491.2 Comparative Example 2 213.6 30.2 443.8 Comparative Example 3 226.4 20.1 426.5 Comparative Example 4 241.6 18.7 498.3 Comparative Example 5 246.1 28.4 454.8

[0079] According to the test results in Table 1, the Cu-Sn-Ti-Cr-Y alloy prepared by this invention exhibits higher tensile strength and better electrical conductivity, solving the problem of poor conductivity in Cu-Ti alloys. Cold rolling deformation increases the dislocation density in the alloy, resulting in dislocation strengthening. The addition of rare earth element Y promotes the recrystallization process, forming fine recrystallized grains and improving the alloy strength. Aging treatment can affect the concentration of Sn, Ti, and Cr in the matrix and the precipitation behavior of the second phase, thereby affecting the tensile strength and electrical conductivity of the alloy. The addition of rare earth element Y promotes the precipitation of CuSn3Ti5 phase during aging and makes the CuSn3Ti5 phase uniformly distributed, improving the strength of the alloy. In addition, the precipitation of the second phase reduces the concentration of Sn and Ti in the matrix, weakening the scattering effect of the matrix on electrons, thereby improving the electrical conductivity of the alloy. In summary, the Cu-Sn-Ti-Cr-Y alloy prepared by this invention has high strength and good electrical conductivity.

[0080] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present invention should be included within the scope of the present invention.

Claims

1. A method for preparing a high-strength, conductive Cu-Sn-Ti-Cr-Y alloy, characterized in that, Includes the following steps: Step S1, Batching: The alloy raw materials are batched according to the following composition by weight percentage: Sn: 2.3~2.6%, Ti: 0.8~1.2%, Cr: 0.21~0.25%, Y: 0.037~0.042%, with the balance being Cu; Step S2, Preparation of intermediate alloy: Copper and tin are placed in a melting furnace at a weight ratio of 9:1, and the furnace pressure is adjusted to 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1050~1100℃, smelted for 0.5~1 h, and cooled to obtain Cu-10%Sn master alloy; Copper and titanium were placed into the smelting furnace at a weight ratio of 9:1, and the furnace pressure was adjusted to 5 × 10⁻⁶. 2 Pa, then argon gas was introduced into the furnace to a pressure of 0.05 MPa, heated to 1050~1100℃, smelted for 0.5~1 h, and cooled to obtain Cu-10%Ti master alloy; Step S3, smelting, casting and descaling: Cu-10%Sn master alloy, Cu-10%Ti master alloy, Cr, Y and balance Cu are put into a smelting furnace to smelt and obtain alloy melt, then cast, cooled to obtain alloy ingot, and the riser and surface oxide scale are removed. Step S4, Solution treatment: The alloy sample is subjected to solution treatment; Step S5, cold rolling deformation: The alloy sample is subjected to cold rolling deformation, with a cold rolling deformation amount of 50%; Step S6, aging treatment: The alloy sample after cold rolling in step S5 is subjected to aging treatment at 400~550 ℃.

2. The method for preparing a high-strength conductive Cu-Sn-Ti-Cr-Y alloy according to claim 1, characterized in that, In step S3, after the Cu-10%Sn master alloy, Cu-10%Ti master alloy, Cr, Y, and the balance Cu are placed into the melting furnace, the furnace pressure is adjusted to 6 × 10⁻⁶. -3 The pressure was increased to MPa, and then argon gas was introduced until the pressure inside the furnace was 0.05 MPa. Then the melting process began at a temperature of 1200℃ for 1 hour.

3. The method for preparing a high-strength conductive Cu-Sn-Ti-Cr-Y alloy according to claim 1, characterized in that, In step S4, the solution treatment involves heating the alloy to 950°C and holding it at that temperature for 2 hours.

4. The method for preparing a high-strength conductive Cu-Sn-Ti-Cr-Y alloy according to claim 1, characterized in that, The time required for step S6 is 10 min to 480 min.

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