High-strength and high-conductivity Cu-Zr alloy added with trace elements and preparation method thereof

Abstract

The invention relates to a high-strength and high-conductivity Cu-Zr alloy material added with trace elements and a preparation method of the high-strength and high-conductivity Cu-Zr alloy material, and belongs to the technical field of copper alloy preparation and processing. The copper alloy is prepared mainly through a combined deformation heat treatment process, the prepared copper alloy has high strength and excellent conductivity and plasticity, the heat stability of the alloy is improved, and the copper alloy can be used as a lead frame, a rectifier device, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material, a high-temperature-resistant copper alloy material and a high-temperature-resistant copper alloy material. The method is applied to advanced fields such as rail transit and electrical electronics.

Description

Technical Field

[0001] The invention belongs to the technical field of copper alloy preparation and processing, and in particular relates to a high-strength and high-conductivity Cu-Zr alloy with added trace elements. Background Art

[0002] High-strength and high-conductivity copper alloys are widely used in lead frames, power transmission devices, rectifiers and other scenarios. As a contact material for lead frames, the alloy's high strength, high conductivity and elongation need to be taken into account. At present, the strength of other Cu-Zr alloys is generally 300-400MPa, which is difficult to meet the application standards, and Cu and Zr are easy to form coarse primary phases, which are easily distributed along grain boundaries, affecting the mechanical properties of the alloy. The copper-zirconium alloy of the present invention, which adds trace elements Si or Si and Cr, greatly improves the strength while ensuring high conductivity and elongation.

[0003] There are great challenges in the preparation process of copper-zirconium alloys with trace elements Si or Si and Cr. First of all, during the smelting and casting process, the Zr element is very easy to volatilize, so the burning loss of the Zr element needs to be considered during the batching process. Due to the addition of Zr, Cr, and Si elements, there is a large component segregation inside the cast ingot, which will lead to uneven structure of the alloy, affecting subsequent processing and final product performance. Therefore, appropriate homogenization treatment is required to ensure uniform composition. Although the solubility of Si in the copper matrix is ​​not high, its effect on conductivity is very significant, and a small amount of solid solution will lead to a decrease in conductivity. Through appropriate aging heat treatment process, the micro-alloying elements dissolved in the matrix can be reduced, thereby improving strength and conductivity at the same time. After solution treatment, cold deformation plus aging is mainly used. Cold deformation provides a large number of nucleation sites for precipitation phases, which improves the overall performance. Summary of the invention

[0004] In order to solve the above-mentioned deficiencies and shortcomings of the prior art, expand the diversity of high-strength and high-conductivity copper alloys, and design copper alloy materials with balanced strength, conductivity and elongation, the present invention provides a high-strength and high-conductivity copper-zirconium alloy with added trace elements and a preparation method thereof, which can significantly improve the strength and / or softening temperature of the alloy while ensuring the original high conductivity of the copper-zirconium alloy.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A high-strength and high-conductivity Cu-Zr alloy with trace Si elements added thereto, the alloy having a ZrCuSi phase, the ZrCuSi phase having a micron size of 100-200um and / or a nanometer size of 20-50nm, the alloy having a micron-sized Zr3Cu4Si2 phase, the Zr3Cu4Si2 phase precipitates in the crystal and is uniformly distributed in a copper matrix.

[0007] A high-strength and high-conductivity Cu-Zr alloy with trace Si elements added thereto consists of the following components: 0.4-0.5wt% Zr, 0.1-0.3wt% Si, and the balance Cu.

[0008] Furthermore, it is composed of the following components: Zr 0.42-0.48wt%, Si 0.1-0.3wt%, and the balance is Cu

[0009] A method for preparing the high-strength and high-conductivity Cu-Zr alloy with a trace amount of Si added thereto comprises the following preparation steps:

[0010] (1) Vacuum melting: The copper-zirconium-silicon alloy is prepared according to its composition, and the copper-zirconium-silicon alloy is melted in a vacuum induction melting furnace in an argon atmosphere to obtain an alloy solution;

[0011] (2) Casting: pouring the alloy solution into a graphite mold at a temperature of 1350-1500° C. for casting, and cooling in a vacuum melting furnace to obtain an alloy ingot;

[0012] (3) Homogenization: The alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 900-1000°C for 4-6 hours, and then taken out and water quenched;

[0013] (4) Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 70-80%;

[0014] (5) Deformation heat treatment: Pre-aging treatment, the pre-aging treated plate is cold deformed with a deformation of 75-85%, and then the main aging treatment is carried out under a protective atmosphere at a temperature of 350-450°C for 1-2 hours.

[0015] Furthermore, the temperature in step (2) is 1450°C.

[0016] Furthermore, the annealing temperature in step (3) is 950° C. and the time is 5 h.

[0017] Furthermore, the deformation amount in step (4) is 75%.

[0018] Furthermore, the pre-aging treatment in step (5) is carried out under the following conditions: pre-aging treatment at 400° C. for 15 minutes.

[0019] Furthermore, the deformation amount in step (5) is 80%.

[0020] A high-strength and high-conductivity Cu-Zr alloy with trace Si and Cr elements added, the alloy has a micron CuZrCrSi phase of 100-200um, a CuZrSi phase of 40-50 microns, and a uniformly dispersed pure Cr phase of less than 10nm and a Cu5Zr phase of 10-20nm. The pure Cr phase and the Cu5Zr phase are precipitated in the crystal and uniformly distributed in the copper matrix.

[0021] Preferably, it is composed of the following ingredients: Zr 0.4-0.5wt%, Si 0.1-0.2wt%, Cr 0.2-0.4wt%, and the balance is Cu.

[0022] A method for preparing a high-strength and high-conductivity Cu-Zr alloy with trace amounts of Si and Cr elements added, comprising the following preparation steps:

[0023] (1) Vacuum melting: The copper-zirconium-silicon alloy is prepared according to its composition, and the copper-zirconium-silicon alloy is melted in a vacuum induction melting furnace in an argon atmosphere to obtain an alloy solution;

[0024] (2) Casting: pouring the alloy solution into a graphite mold at a temperature of 1350-1500° C. for casting, and cooling in a vacuum melting furnace to obtain an alloy ingot;

[0025] (3) Homogenization: The alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 900-1000°C for 4-6 hours, and then taken out and water quenched;

[0026] (4) Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 70-80%;

[0027] (5) Deformation heat treatment: pre-aging treatment, water quenching, cold deformation of the pre-aging plate, deformation of 75-85%, and then main aging treatment under protective atmosphere, temperature of 350-450℃, time of 1-2h.

[0028] Preferably, the temperature in step (2) is 1400°C;

[0029] The annealing temperature in step (3) is 950°C and the time is 5h;

[0030] The deformation amount in step (4) is 75%;

[0031] The pre-aging treatment conditions in step (5) are: 400° C. pre-aging treatment for 15 minutes;

[0032] The deformation amount in step (5) is 80%.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) There are challenges in the preparation process of copper-zirconium alloy, especially in the smelting and casting process. Zirconium is volatile, so burnout needs to be considered. The present invention accurately calculates and controls the burnout amount of zirconium, and combines appropriate homogenization treatment to effectively promote the uniform distribution of zirconium, silicon or silicon-chromium elements in the alloy.

[0035] (2) The preparation method of the copper-zirconium alloy described in the present invention effectively avoids the problem of the distribution of coarse primary phases along the grain boundaries in the copper-zirconium alloy. Since zirconium and silicon have more negative formation enthalpy, multi-scale ZrCuSi and Zr3Cu4Si2 phases are precipitated in the alloy, replacing the Cu5Zr phase. Since Cr can easily replace Zr atoms and Si atoms, the ZrCuSi phase is transformed into the CuZrCrSi phase, and the nano-precipitation of pure Cr is promoted. These micron and nano-precipitated phases act as strong pinning particles to hinder dislocation movement and have excellent thermal stability, which improves the strengthening effect while improving the alloy's resistance to softening.

[0036] (3) The method for preparing the high-strength and high-conductivity copper-zirconium alloy of the present invention can achieve controllable performance by adjusting the content of alloying elements, process parameters, including aging temperature, time, cold rolling reduction, etc. The preparation of the present invention only requires traditional vacuum melting + combined deformation heat treatment process, which is simple, low-cost, and has low requirements on equipment, and can be suitable for large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 The cast metallographic microstructure of the copper-zirconium-silicon alloy in Example 1 of the present application is

[0039] Figure 2 The metallographic microstructure of the copper-zirconium-silicon alloy after homogenization in Example 1 of the present application

[0040] Figure 3 This is a scanning electron microscope photo of the ZrCuSi phase of the copper-zirconium-silicon alloy of Example 1 of the present application

[0041] Figure 4 The XRD analysis results of copper-zirconium (chromium) silicon alloys of Examples 1, 2, 4 and 5 of this application are shown in FIG.

[0042] Figure 5 This is the SEM image of the aged copper-zirconium-chromium-silicon alloy of Example 5 of the present application.

[0043] Figure 6 TEM image of the high temperature softened state of copper-zirconium-chromium-silicon alloy in Example 6 of the present application DETAILED DESCRIPTION

[0044] In order to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific implementation modes of the present invention are further described below.

[0045] The endpoints and any values ​​of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.

[0046] Example 1

[0047] A method for preparing a high-strength and high-conductivity copper-zirconium alloy with a trace amount of Si element added, comprising the following steps:

[0048] 1. Composition design: The high-strength and high-conductivity copper-zirconium alloy material with trace Si elements is composed of the following components: Zr0.42wt%, Si0.1%, and the balance is Cu;

[0049] 2. Vacuum melting: According to the above components of the copper-zirconium-silicon alloy, the copper-zirconium-silicon alloy is prepared and melted in an argon atmosphere in a vacuum induction melting furnace to obtain an alloy solution;

[0050] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1450°C for casting, and cool it in a vacuum melting furnace;

[0051] 4. Homogenization: Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0052] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0053] 6. Combined deformation heat treatment: The plate pre-aged at 400℃ for 15 minutes was cold deformed to 80%. Then the main aging treatment was carried out under protective atmosphere at 350℃, 400℃, and 450℃ for 1h. The mechanical and electrical properties of the copper-zirconium-silicon alloy finally prepared are shown in Table 1. Its XRD spectrum is shown in Figure 4As shown, in addition to the main Cu peak, there are peak lines of Zr3Cu4Si2 and Cu5Zr.

[0054] Table 1 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in Example 1

[0055]

[0056] Example 2

[0057] A method for preparing a high-strength and high-conductivity copper-zirconium alloy with a trace amount of Si element added, comprising the following steps:

[0058] 1. Composition design: The high-strength and high-conductivity copper-zirconium alloy material with trace Si elements is composed of the following components: Zr0.46wt%, Si0.21wt%, and the balance is Cu;

[0059] 2. Vacuum melting: According to the above components of the copper-zirconium-silicon alloy, the copper-zirconium-silicon alloy is prepared and melted in an argon atmosphere in a vacuum induction melting furnace to obtain an alloy solution;

[0060] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1450°C for casting, and cool it in a vacuum melting furnace;

[0061] 4. Homogenization: Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0062] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0063] 6. Combined deformation heat treatment: The plate pre-aged at 400℃ for 15 minutes was cold deformed to a deformation of 80%. Then the main aging treatment was carried out under a protective atmosphere at 350℃, 400℃, and 450℃ for 1h. The mechanical and electrical properties of the copper-zirconium-silicon alloy finally prepared are shown in Table 2. Its XRD spectrum is shown in Figure 4 As shown, in addition to the main Cu peak, there are weak peaks of Zr3Cu4Si2 and Cu5Zr.

[0064] Table 2 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in Example 2

[0065]

[0066] Example 3

[0067] A method for preparing a high-strength and high-conductivity copper-zirconium alloy with a trace amount of Si element added, comprising the following steps:

[0068] 1. Composition design: The high-strength and high-conductivity copper-zirconium alloy material with trace Si elements is composed of the following components: Zr0.48wt%, Si0.3wt%, and the balance is Cu;

[0069] 2. Vacuum melting: According to the above components of the copper-zirconium-silicon alloy, the copper-zirconium-silicon alloy is prepared and melted in an argon atmosphere in a vacuum induction melting furnace to obtain an alloy solution;

[0070] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1450°C for casting, and cool it in a vacuum melting furnace;

[0071] 4. Homogenization: Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0072] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0073] 6. Combined deformation heat treatment: The plate pre-aged at 400℃ for 15 minutes was cold deformed with a deformation of 80%. Then the main aging treatment was carried out under a protective atmosphere at 350℃, 400℃, and 450℃ for 1h. The mechanical and electrical properties of the copper-zirconium-silicon alloy finally prepared are shown in Table 3.

[0074] Table 3 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in Example 3

[0075]

[0076] Example 4

[0077] A method for preparing a high-strength and high-conductivity copper-zirconium alloy with trace amounts of Si and Cr elements added, comprising the following steps:

[0078] 1. Composition design: The high-strength and high-conductivity copper-zirconium alloy material with trace Si elements is composed of the following components: Zr0.46wt.%, Si0.1wt.%, Cr0.2wt.%, and the balance is Cu;

[0079] 2. Vacuum melting: According to the above components of the copper-zirconium-silicon alloy, the copper-zirconium-silicon alloy is prepared and melted in an argon atmosphere in a vacuum induction melting furnace to obtain an alloy solution;

[0080] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1400°C for casting, and cool it in a vacuum melting furnace;

[0081] 4. Homogenization: Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0082] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0083] 6. Combined deformation heat treatment: pre-aging the plate at 750℃ for 5 minutes, water quenching; cold deformation of the plate, deformation amount of 80%; aging treatment of the plate, treatment temperature of 350℃, 400℃, 450℃. The mechanical and electrical properties of the finally prepared copper-zirconium-silicon-chromium alloy are shown in Table 4. Its XRD spectrum is shown in Figure 4 As shown, compared with Example 1, the peak line of Zr3Cu4Si2 is slightly shifted, which may be due to the addition of Cr element, which replaces the Zr or Si atoms therein to form CuZrCrSi phase. The two phases have exactly the same crystal structure.

[0084] Table 4 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon-chromium alloy in Example 4

[0085]

[0086] Example 5

[0087] A method for preparing a high-strength and high-conductivity copper-zirconium alloy with trace amounts of Si and Cr elements added, comprising the following steps:

[0088] 1. Composition design: The high-strength and high-conductivity copper-zirconium alloy material with trace Si-Cr elements is composed of the following components: Zr0.5wt.%, Si0.1wt.%, Cr0.4wt.%, and the balance is Cu;

[0089] 2. Vacuum melting: The copper-zirconium-chromium-silicon alloy is prepared according to the above components, and the copper-zirconium-silicon alloy is melted in an argon atmosphere using a vacuum induction melting furnace to obtain an alloy solution;

[0090] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1400°C for casting, and cool it in a vacuum melting furnace;

[0091] 4. Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0092] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0093] 6. Combined deformation heat treatment: pre-aging the plate at 400℃ for 15 minutes, water quenching; cold deformation of the plate, deformation amount of 80%; aging treatment of the plate, treatment temperature of 350℃, 400℃, 450℃. The mechanical and electrical properties of the copper-zirconium-silicon-chromium alloy finally prepared are shown in Table 5. Its XRD spectrum is shown in Figure 4 .

[0094] Table 5 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in Example 5

[0095]

[0096] Example 6

[0097] A method for preparing a high-strength and high-conductivity copper-zirconium alloy with trace amounts of Si and Cr elements added, comprising the following steps:

[0098] 1. Composition design: The high-strength and high-conductivity copper-zirconium alloy material with trace Si elements is composed of the following components: Zr0.45wt.%, Si0.1wt.%, Cr0.2wt.%, and the balance is Cu;

[0099] 2. Vacuum melting: The copper-zirconium-chromium-silicon alloy is prepared according to the above components, and the copper-zirconium-silicon alloy is melted in an argon atmosphere using a vacuum induction melting furnace to obtain an alloy solution;

[0100] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1400°C for casting, and cool it in a vacuum melting furnace;

[0101] 4. Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0102] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0103] 6. Combined deformation heat treatment: pre-aging the plate at 400°C for 15 minutes, water quenching; cold deformation of the plate, deformation amount of 80%; aging treatment of the plate, treatment temperature of 350°C, 400°C, 450°C. The mechanical and electrical properties of the finally prepared copper-zirconium-silicon-chromium alloy are shown in Table 6.

[0104] Table 6 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in Example 6

[0105]

[0106] Comparative Example 1

[0107] A method for preparing a copper-zirconium alloy comprises the following steps:

[0108] 1. Composition design: The copper-zirconium alloy material without Si element addition is composed of the following components: Zr 0.48wt%, Si0wt%, and the balance is Cu;

[0109] 2. Vacuum melting: The copper-zirconium-silicon alloy is prepared according to the above components, and the copper-zirconium-silicon alloy is melted in an argon atmosphere using a vacuum induction melting furnace to obtain an alloy solution;

[0110] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1450°C for casting, and cool it in a vacuum melting furnace;

[0111] 4. Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0112] 5. Cold rolling: the homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0113] 6. Combined deformation heat treatment: The plate pre-aged at 400℃ for 15 minutes was cold deformed with a deformation of 80%. Then the main aging treatment was carried out under a protective atmosphere at 350℃, 400℃, and 450℃ for 1h. The mechanical and electrical properties of the copper-zirconium-silicon alloy finally prepared are shown in Table 7.

[0114] Table 7 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in comparative example 1

[0115]

[0116] Comparative Example 2

[0117] A method for preparing a copper-zirconium alloy comprises the following steps:

[0118] 1. Composition design: The copper-zirconium alloy material is composed of the following components: Zr0.46 wt%, Si0.4wt%, and the balance is Cu;

[0119] 2. Vacuum melting: According to the above components of the copper-zirconium-silicon alloy, the copper-zirconium-silicon alloy is prepared and melted in an argon atmosphere in a vacuum induction melting furnace to obtain an alloy solution;

[0120] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1450°C for casting, and cool it in a vacuum melting furnace;

[0121] 4. Homogenization: Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0122] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0123] 6. Combined deformation heat treatment: The plate pre-aged at 400℃ for 15 minutes was cold deformed with a deformation of 80%. Then the main aging treatment was carried out under a protective atmosphere at 350℃, 400℃, and 450℃ for 1h. The mechanical and electrical properties of the copper-zirconium-silicon alloy finally prepared are shown in Table 8.

[0124] Table 8 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in comparative example 2

[0125]

[0126] Comparative Example 3

[0127] A method for preparing a copper-zirconium alloy comprises the following steps:

[0128] 1. Composition design: The copper-zirconium alloy material is composed of the following components: Zr0.42 wt%, Si0.1%, and the balance is Cu;

[0129] 2. Vacuum melting: According to the above components of the copper-zirconium-silicon alloy, the copper-zirconium-silicon alloy is prepared and melted in an argon atmosphere in a vacuum induction melting furnace to obtain an alloy solution;

[0130] 3. Casting: pour the copper alloy into a graphite mold at a temperature of 1450°C for casting, and cool it in a vacuum melting furnace;

[0131] 4. Homogenization: Homogenization: The copper alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 950°C for 5 hours, and then taken out for water quenching;

[0132] 5. Cold rolling: Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 75%;

[0133] 6. Combined deformation heat treatment: The plate pre-aged at 400℃ for 15 minutes was cold deformed to 80%. Then the main aging treatment was carried out under protective atmosphere at a temperature of 500℃ for 1h. The mechanical and electrical properties of the copper-zirconium-silicon alloy finally prepared are shown in Table 9.

[0134] Table 9 Comprehensive mechanical and electrical properties data of copper-zirconium-silicon alloy in comparative example 3

[0135]

[0136] The performance test methods of the alloy are as follows:

[0137] Tensile strength: Using INSTRON 1346 hydraulic universal testing machine, -3 s -1 Quasi-static stretching was performed at a strain rate of .

[0138] Yield strength: Take σ 0.2 The strength corresponding to the location is the yield strength.

[0139] Elongation after fracture: The elongation is measured after the sample undergoes a tensile test.

[0140] Conductivity: Use QJ36s DC resistance tester to measure the resistance of the sample, then measure the cross-sectional area of ​​the sample and the volume of the measurement interval, and calculate the conductivity of the sample. To ensure the reliability of the data, each sample is measured at three different locations and the average value is taken.

[0141] Anti-softening temperature: The high temperature softening test of the alloy is based on GBGB / T 33370-2016 standard. The specific method is: select the sample in the peak aging state, keep it warm for one hour at 450 degrees Celsius to 650 degrees Celsius, with an interval of 25 degrees, and then conduct hardness test on the obtained sample. The hardness value retains 80% of the peak aging hardness as the anti-softening temperature at this time.

[0142] The embodiments of the present invention are described in detail, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations made to these embodiments without departing from the principles and spirit of the present invention still fall within the protection scope of the present invention.

Claims

1. A high-strength and high-conductivity Cu-Zr alloy with trace Si elements added, characterized in that: The alloy has a ZrCuSi phase, the ZrCuSi phase has a micron size of 100-200um and / or a nanometer size of 20-50nm, the alloy has a micron-sized Zr3Cu4Si2 phase, the Zr3Cu4Si2 phase precipitates in the crystal and is uniformly distributed in the copper matrix.

2. A high-strength and high-conductivity Cu-Zr alloy with trace Si elements added as claimed in claim 1, characterized in that: It is composed of the following ingredients: Zr 0.4-0.5wt%, Si 0.1-0.3wt%, and the balance is Cu.

3. A high-strength and high-conductivity Cu-Zr alloy with trace Si added as claimed in claim 1 or 2, characterized in that: It is composed of the following ingredients: Zr 0.42-0.48wt%, Si 0.1-0.3wt%, and the balance is Cu.

4. A method for preparing a high-strength and high-conductivity Cu-Zr alloy with added trace Si elements as claimed in any one of claims 1 to 3, comprising the following preparation steps: (1) Vacuum melting: The copper-zirconium-silicon alloy is prepared according to its composition, and the copper-zirconium-silicon alloy is melted in a vacuum induction melting furnace in an argon atmosphere to obtain an alloy solution; (2) Casting: pouring the alloy solution into a graphite mold at a temperature of 1350-1500° C. for casting, and cooling in a vacuum melting furnace to obtain an alloy ingot; (3) Homogenization: The alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 900-1000°C for 4-6 hours, and then taken out and water quenched; (4) Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 70-80%; (5) Deformation heat treatment: Pre-aging treatment, the pre-aging treated plate is cold deformed with a deformation of 75-85%, and then the main aging treatment is carried out under a protective atmosphere at a temperature of 350-450°C for 1-2 hours.

5. A method for preparing a high-strength and high-conductivity Cu-Zr alloy with trace Si elements added as claimed in claim 4, characterized in that: The temperature in step (2) is 1450°C; The annealing temperature in step (3) is 950°C and the time is 5h; The deformation amount in step (4) is 75%; The pre-aging treatment conditions in step (5) are: 400° C. pre-aging treatment for 15 minutes; The deformation amount in step (5) is 80%.

6. A high-strength and high-conductivity Cu-Zr alloy with trace amounts of Si and Cr added, characterized in that: The alloy has a micron CuZrCrSi phase of 100-200um, a CuZrSi phase of 40-50 microns, and a uniformly dispersed pure Cr phase of less than 10nm and a Cu5Zr phase of 10-20nm. The pure Cr phase and the Cu5Zr phase are precipitated in the crystal and uniformly distributed in the copper matrix.

7. A high-strength and high-conductivity Cu-Zr alloy with trace amounts of Si and Cr added as claimed in claim 6, characterized in that: It is composed of the following ingredients: Zr 0.4-0.5wt%, Si 0.1-0.2wt%, Cr 0.2-0.4wt%, and the balance is Cu.

8. A method for preparing a high-strength and high-conductivity Cu-Zr alloy with trace amounts of Si and Cr added as claimed in claim 6 or 7, comprising the following preparation steps: (1) Vacuum melting: The copper-zirconium-silicon alloy is prepared according to its composition, and the copper-zirconium-silicon alloy is melted in a vacuum induction melting furnace in an argon atmosphere to obtain an alloy solution; (2) Casting: pouring the alloy solution into a graphite mold at a temperature of 1350-1500° C. for casting, and cooling in a vacuum melting furnace to obtain an alloy ingot; (3) Homogenization: The alloy ingot is subjected to homogenization annealing treatment in a protective atmosphere at a temperature of 900-1000°C for 4-6 hours, and then taken out and water quenched; (4) Cold rolling: The homogenized ingot is cut and milled, and then cold rolled on a two-roll mill with a deformation of 70-80%; (5) Deformation heat treatment: pre-aging treatment, water quenching, cold deformation of the pre-aging plate, deformation of 75-85%, and then main aging treatment under protective atmosphere, temperature of 350-450℃, time of 1-2h.

9. A method for preparing a high-strength and high-conductivity Cu-Zr alloy with trace amounts of Si and Cr added as claimed in claim 8, characterized in that: The temperature in step (2) is 1400° C. The annealing temperature in step (3) is 950°C and the time is 5h; The deformation amount in step (4) is 75%; The pre-aging treatment conditions in step (5) are: 400° C. pre-aging treatment for 15 minutes; The deformation amount in step (5) is 80%.

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