Titanium bronze alloy material and preparation method thereof

Abstract

The invention belongs to the technical field of copper alloy materials, and particularly relates to a titanium bronze alloy material and a preparation method thereof. The invention provides a preparation method of a titanium bronze alloy material. The titanium bronze alloy material comprises the following components in percentage by mass: 1.5 to 5 percent of Ti, 0.06 to 0.5 percent of Fe and the balance of Cu. The preparation raw materials of the titanium bronze alloy material are subjected to vacuum casting, an obtained titanium bronze alloy ingot is subjected to hot rolling treatment, cold rolling treatment and aging treatment, and the titanium bronze alloy material is obtained. The titanium bronze alloy material obtained by the preparation method provided by the invention has high strength and conductivity, meanwhile, the processing procedure of the titanium bronze alloy material is shortened, the preparation efficiency of the titanium bronze alloy material is improved, and the practical application requirements of the fields of electronic elastic elements, connectors and the like on ultrahigh-strength conductive copper alloy strips can be effectively met.

Description

Technical Field

[0001] The invention belongs to the technical field of copper alloy materials, and in particular relates to a titanium bronze alloy material and a preparation method thereof. Background Art

[0002] Titanium bronze alloy has excellent comprehensive properties such as high strength and high elasticity, and is widely used in aerospace, high-end electronic connectors, frame materials and other fields. Among the currently known 1000 MPa grade conductive copper alloys, titanium bronze alloy has excellent deformation processing performance, green environmental protection, low raw material cost and other characteristics, and has gradually become the research focus of ultra-high strength conductive copper alloys. The addition of Ti element forms nano-scale β'-Cu during the aging process. 4 Ti phase provides excellent precipitation strengthening effect for titanium bronze. At the same time, Ti atoms in the form of solid solution aggravate the lattice distortion of the matrix. In the common alloying method, the influence of Ti element on the electrical conductivity is also very significant. During the aging precipitation process of titanium bronze alloy, Ti atoms first transform into Ti-rich area and Ti-poor area, and gradually transform into metastable β'-Cu with the diffusion of Ti atoms. 4 As the aging temperature increases and the holding time prolongs, the second phase structure in the titanium bronze alloy gradually undergoes discontinuous precipitation transformation to form a stable β-Cu 4 Phase.

[0003] With the development of thinner and lighter advanced electronic and conductor materials, the simultaneous improvement of alloy strength and electrical conductivity is the research focus of the development of ultra-high strength conductive copper alloys. However, the insufficient diffusion of Ti atoms greatly limits the comprehensive performance of titanium bronze alloys. The increase in aging temperature promotes the 4 The precipitation of Ti phase also intensifies the transformation of discontinuous precipitation phase and significantly reduces the strength and conductivity of the alloy.

[0004] Therefore, the synergistic improvement of the strength and electrical conductivity of titanium bronze alloys remains an urgent problem to be solved in the preparation of ultra-high-strength conductive copper alloys with excellent comprehensive performance. Summary of the invention

[0005] The object of the present invention is to provide a titanium bronze alloy material and a preparation method thereof. The titanium bronze alloy material obtained by the preparation method provided by the present invention has both high strength and electrical conductivity, and at the same time shortens the processing steps of the titanium bronze alloy material, improves the preparation efficiency of the titanium bronze alloy material, and can effectively meet the actual application needs of electronic elastic components, connectors and other fields for ultra-high strength conductive copper alloy strips.

[0006] In order to achieve the above object, the present invention provides the following technical solutions: The present invention provides a method for preparing a titanium bronze alloy material, wherein the titanium bronze alloy material comprises the following components in percentage by weight: Ti 1.5-5wt.%, Fe 0.06-0.5wt.%, and the remainder Cu; The following steps are involved: Vacuum casting the raw materials for the titanium bronze alloy material to obtain a titanium bronze alloy ingot; The titanium bronze alloy ingot is subjected to hot rolling treatment, wherein the initial hot rolling temperature of the hot rolling treatment is greater than the final hot rolling temperature, to obtain a hot-rolled titanium bronze alloy; cold-rolling the hot-rolled titanium bronze alloy to obtain a cold-rolled titanium bronze alloy; The cold-rolled titanium bronze alloy is subjected to aging treatment to obtain the titanium bronze alloy material.

[0007] Preferably, the vacuum casting comprises the following steps: The raw materials for preparing the titanium bronze alloy material are smelted to obtain a melt; the raw materials for preparing the titanium bronze alloy material include pure copper, pure titanium and copper-iron intermediate alloy, and the smelting temperature is 1150-1250° C.; The melt is sequentially subjected to heat preservation treatment, casting treatment and quenching and cooling in water to obtain a titanium bronze alloy ingot; the heat preservation treatment temperature is 1200-1250° C., and the heat preservation time is 20-30 minutes.

[0008] Preferably, the hot rolling process is a multi-pass hot rolling process, the temperature of the first hot rolling process (hot initial rolling) is 800-850°C, and the temperature of the last hot rolling process (hot final rolling) is 400-650°C.

[0009] Preferably, the total deformation of the hot rolling treatment is 60-75%; The cooling method after the hot rolling treatment is: quenching in water to room temperature.

[0010] Preferably, the total true strain of the cold rolling process is 1.8-5; and the deformation of each cold rolling process is 15-50%.

[0011] Preferably, the cold rolling treatment is a one-step cold rolling treatment without intermediate aging treatment or a multi-step cold rolling treatment with intermediate aging treatment.

[0012] Preferably, the cold rolling treatment is a multi-step cold rolling treatment including an intermediate aging treatment, and the true strain of the cold rolling before the first aging treatment is greater than 0.8.

[0013] Preferably, the multi-step cold rolling treatment including the intermediate aging treatment comprises sequentially performing: a first step cold rolling treatment, an intermediate aging treatment and a second step cold rolling treatment.

[0014] Preferably, the temperature of the aging treatment is 200-450° C., and the holding time is 1-8 hours.

[0015] The present invention provides a titanium bronze alloy material prepared by the preparation method described in the above technical solution.

[0016] The present invention provides the application of the titanium bronze alloy material described in the above technical solution in electronic elastic elements or electronic connectors.

[0017] The present invention provides a method for preparing a titanium bronze alloy material, wherein the titanium bronze alloy material comprises the following components in percentage by mass: Ti 1.5-5wt.%, Fe 0.06-0.5wt.%, and the remainder is Cu; the method comprises the following steps: vacuum casting the raw materials for preparing the titanium bronze alloy material to obtain a titanium bronze alloy ingot; hot rolling the titanium bronze alloy ingot, wherein the initial hot rolling temperature of the hot rolling treatment is greater than the final hot rolling temperature, to obtain a hot-rolled titanium bronze alloy; cold rolling the hot-rolled titanium bronze alloy to obtain a cold-rolled titanium bronze alloy; aging the cold-rolled titanium bronze alloy to obtain the titanium bronze alloy material. In the present invention, the titanium bronze alloy ingot relies on hot rolling treatment to achieve solid solution control and component distribution of Ti atoms. The precipitation of the Ti element is a key factor in the excellent mechanical properties of the titanium bronze alloy. In conventional solution-aging treatment, supersaturated Ti atoms are evenly distributed in the matrix after sufficient solution treatment, and after aging treatment, they undergo early short-range ordered structure and Ti-rich and Ti-poor regions, and finally precipitate continuously to form β'-Cu 4 Ti phase. However, the diffusion of Ti in copper alloy is relatively slow, and the β'-Cu 4 It is often very difficult to fully precipitate the Ti phase. Among the common alloying elements, the effect of Ti on the electrical conductivity of copper alloys is very significant. Therefore, the inadequate precipitation of Ti atoms in the copper matrix is ​​a key factor that inhibits the improvement of the strength and electrical conductivity of titanium bronze alloys. The present invention adopts hot rolling treatment. During the hot rolling process of the titanium bronze alloy, the high-temperature deformation of the hot rolling treatment can effectively promote the fracture and dissolution of the primary phase, as well as the elimination of segregation within the cast crystal. At the same time, with the gradual temperature drop of the titanium bronze ingot during the hot rolling process, the Ti element gradually distributes along the grain boundaries, and tends to be in the form of steady-state β-Cu in the high-temperature phase region. 4Ti phase is precipitated. However, the hot deformation process inhibits the precipitation of supersaturated Ti elements at the grain boundaries. As the hot rolling temperature gradually decreases, the diffusion capacity of Ti atoms in the present invention gradually weakens, and the Ti element is only enriched at the grain boundaries. Then, in the subsequent cold rolling process, the grains are gradually elongated, and the Ti element is enriched outside the fibrous deformed grains after aging treatment, forming a strip-like distribution of the Ti element. As a result, the present invention effectively improves the distribution of the Ti element in the alloy and forms a strip-like distribution of the Ti element. Moreover, the addition of the Fe element in the present invention can effectively refine the cast grain size of the titanium bronze alloy by forming a primary Ti-Fe phase, and inhibit the migration of grain boundaries during hot rolling. At the same time, hot rolling can also effectively avoid grain coarsening after solution treatment, and further improve the uniformity of the structure of the titanium bronze alloy. The average grain size of the hot-rolled titanium bronze alloy obtained by the present invention is less than 5 μm; more preferably, the average grain size is only 3.5 μm. In summary, the present invention significantly improves the comprehensive performance of titanium bronze alloy materials; the tensile strength and electrical conductivity of the titanium bronze alloy in the present invention can reach 1100 ~ 1300 MPa and 15 ~ 19% IACS respectively after the deformation heat treatment, and is widely used in the fields of ultra-high strength conductive connectors, elastic elements, etc. At the same time, the present invention shortens the process flow and improves production efficiency; the present invention does not require solid solution treatment, which can significantly shorten the production cycle of titanium bronze alloy and promote the short-process production of titanium bronze strips. Severe cold plastic deformation significantly accelerates the nucleation and precipitation process of Ti elements, which increases the precipitation strengthening rate and peak aging rate of titanium bronze alloys, which helps to further improve the production efficiency of titanium bronze alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the TEM structure of the titanium bronze alloy material prepared in Example 2. DETAILED DESCRIPTION

[0019] The present invention provides a method for preparing a titanium bronze alloy material, wherein the titanium bronze alloy material comprises the following components in percentage by weight: Ti 1.5-5wt.%, Fe 0.06-0.5wt.%, and the remainder Cu; The following steps are involved: Vacuum casting the raw materials for the titanium bronze alloy material to obtain a titanium bronze alloy ingot; The titanium bronze alloy ingot is subjected to hot rolling treatment, wherein the initial hot rolling temperature of the hot rolling treatment is greater than the final hot rolling temperature, to obtain a hot-rolled titanium bronze alloy; cold-rolling the hot-rolled titanium bronze alloy to obtain a cold-rolled titanium bronze alloy; The cold-rolled titanium bronze alloy is subjected to aging treatment to obtain the titanium bronze alloy material.

[0020] In the present invention, unless otherwise specified, all preparation raw materials / components are commercially available products well known to those skilled in the art.

[0021] The invention provides a method for preparing a titanium bronze alloy material, wherein the titanium bronze alloy material comprises the following components in percentage by mass: 1.5-5wt.% Ti, 0.06-0.5wt.% Fe, and the remainder Cu.

[0022] In terms of mass percentage, the titanium bronze alloy material includes Ti 1.5-5wt.%, preferably 2.5-4wt.%, and specifically 3.1wt.% in the embodiment.

[0023] In terms of mass percentage, the titanium bronze alloy material includes 0.06-0.5wt.%, preferably 0.1-0.3wt.%, and specifically 0.2wt.% of Fe in the embodiment. In the present invention, the addition of Fe element can combine with Ti to form a Ti-Fe primary phase during solidification, thereby refining the cast grain size of the titanium bronze alloy and providing a tissue basis for controlling the distribution of Ti along the grain in subsequent processing.

[0024] Measured in percentage by mass, the titanium bronze alloy material includes a remainder of Cu.

[0025] The present invention performs vacuum casting on the raw materials for preparing the titanium bronze alloy material to obtain a titanium bronze alloy ingot. In the present invention, the vacuum casting preferably includes the following steps: smelting the raw materials for preparing the titanium bronze alloy material to obtain a melt. In the present invention, the raw materials for preparing the titanium bronze alloy material preferably include pure copper, pure titanium and copper-iron intermediate alloy, the purity of the pure copper is preferably ≥99%, and the purity of the pure titanium is preferably ≥99%. In a specific embodiment of the present invention, the copper-iron intermediate alloy is specifically Cu-10Fe. The smelting is preferably carried out in a vacuum induction melting furnace, and the smelting temperature is preferably 1150~1250℃, more preferably 1150~1180℃. After obtaining the melt, the present invention sequentially performs heat preservation treatment, casting treatment and quenching and cooling in water on the melt to obtain a titanium bronze alloy ingot. In the present invention, the temperature of the heat preservation treatment is preferably 1200~1250℃, more preferably 1200~1220℃; the heat preservation time of the heat preservation treatment is preferably 20~30min, and specifically 20min in the embodiment. The quenching cooling is preferably performed in water to room temperature.

[0026] After obtaining the titanium bronze alloy ingot, the present invention performs hot rolling on the titanium bronze alloy ingot, and the hot rolling temperature of the hot rolling treatment is greater than the hot rolling temperature to obtain a hot-rolled titanium bronze alloy. In the present invention, before the hot rolling treatment, the present invention preferably further comprises: heat treating the titanium bronze alloy ingot, and hot rolling the heat-treated titanium bronze alloy ingot. The heat treatment is preferably carried out in a box-type resistance furnace, the temperature of the heat treatment is preferably 850-880°C, and the holding time is preferably 1-2h. Through heat treatment, the present invention can make the titanium bronze alloy ingot reach the hot rolling temperature of the hot rolling treatment (i.e., the temperature of the first hot rolling), and at the same time make the internal temperature distribution of the titanium bronze alloy ingot uniform. In the present invention, the hot rolling temperature of the hot rolling treatment is greater than the hot rolling temperature, and the hot rolling temperature is preferably 400-650°C, and more preferably 500-650°C. The hot rolling treatment is preferably a multi-pass hot rolling treatment. The temperature of the first hot rolling treatment (hot initial rolling) is preferably 800-850°C, more preferably 820-850°C. The temperature of the last hot rolling treatment (hot final rolling) is preferably 400-650°C, more preferably 500-650°C. During the hot rolling treatment, a thermocouple is preferably used to record the temperature change during the hot rolling treatment. In the present invention, the hot initial rolling temperature of the hot rolling treatment is greater than the hot final rolling temperature. The present invention preferably controls the temperature of the first hot rolling treatment (hot initial rolling) and the temperature of the last hot rolling treatment (hot final rolling) so that the Ti element gradually diffuses and segregates during the gradual cooling process of multiple hot rolling treatments, but does not precipitate in the form of β-Cu4Ti phase. The reduction of the hot rolling temperature in the present invention can cause the grains to undergo incomplete recrystallization and elongate along the rolling direction in the subsequent treatment process after the hot rolling, so that the Ti element is segregated along the grain boundaries.

[0027] In the present invention, the total deformation of the hot rolling process is preferably 60-75%, more preferably 60-70%. The cooling method after the hot rolling process (i.e. the last hot rolling process) is preferably: quenching in water to room temperature.

[0028] After obtaining the hot-rolled titanium bronze alloy, the present invention performs cold rolling on the hot-rolled titanium bronze alloy to obtain the cold-rolled titanium bronze alloy. After obtaining the cold-rolled titanium bronze alloy, the present invention performs aging treatment on the cold-rolled titanium bronze alloy to obtain the titanium bronze alloy material.

[0029] In the present invention, the total true strain of the cold rolling process is preferably 1.8 to 5, more preferably 3 to 5, and specifically 3.91 or 2.3 in the embodiment. The deformation of each cold rolling process is preferably 15 to 50%.

[0030] In the present invention, the cold rolling treatment is preferably a one-step cold rolling treatment without an intermediate aging treatment or a multi-step cold rolling treatment with an intermediate aging treatment.

[0031] As one of the multiple specific embodiments of the present invention, the cold rolling treatment is a one-step cold rolling treatment without intermediate aging treatment. When the cold rolling treatment is a one-step cold rolling treatment without intermediate aging treatment, the cold rolling treatment and aging treatment are specifically: the hot-rolled titanium bronze alloy is subjected to cold rolling treatment and aging treatment in sequence to obtain the titanium bronze alloy material.

[0032] As one of the multiple specific embodiments of the present invention, the cold rolling treatment is a two-step cold rolling treatment including an intermediate aging treatment. When the cold rolling treatment is a two-step cold rolling treatment including an intermediate aging treatment, the cold rolling treatment and the aging treatment are specifically: the hot-rolled titanium bronze alloy is subjected to a first cold rolling treatment, an intermediate aging treatment, a second cold rolling treatment and an aging treatment in sequence to obtain the titanium bronze alloy material. In the first cold rolling treatment and the second cold rolling treatment: the deformation amount of each cold rolling treatment is preferably 15-50%. The total true strain of the first cold rolling treatment and the second cold rolling treatment is preferably 1.8-5, more preferably 3-5, and specifically 3.91 or 2.3 in the embodiment.

[0033] In the present invention, when the cold rolling treatment is a multi-step cold rolling treatment including an intermediate aging treatment, the true strain of cold rolling before the first aging treatment is preferably greater than 0.8. Before the first aging treatment, the true strain of cold rolling of the copper alloy strip of the present invention has exceeded 0.8 (80%), that is, the first aging treatment of the present invention is preferably performed after large cold rolling deformation. In the present invention, the proportion of cold-deformed structure after the first aging treatment is preferably greater than 90%, to ensure that no recovery recrystallization occurs after the first aging treatment, but sufficient cold-deformed structure is maintained.

[0034] In the present invention, when the cold rolling treatment is preferably a multi-step cold rolling treatment including an intermediate aging treatment, the operation method of the intermediate aging treatment during the multi-step cold rolling treatment is the same as the operation method of the aging treatment performed after the multi-step cold rolling treatment.

[0035] In the present invention, the temperature of the intermediate aging treatment is preferably 200-450°C, more preferably 300-350°C, and specifically 300°C in the embodiment; the holding time of the intermediate aging treatment is preferably 1-8h, more preferably 1-5h, and specifically 1h in the embodiment.

[0036] In the present invention, the temperature of the aging treatment is preferably 200-450°C, more preferably 320-350°C, and specifically 400°C or 350°C in the embodiments; the holding time of the aging treatment is preferably 1-8h, more preferably 2-5h, and specifically 1h or 2h in the embodiments.

[0037] The present invention provides a titanium bronze alloy material prepared by the preparation method described in the above technical solution.

[0038] In the present invention, the titanium bronze alloy material is specifically a titanium bronze alloy strip.

[0039] The present invention provides the application of the titanium bronze alloy material described in the above technical solution in electronic elastic elements or electronic connectors.

[0040] The present invention has at least the following beneficial effects: The present invention significantly improves the comprehensive performance of titanium bronze alloy strips; the tensile strength and electrical conductivity of the titanium bronze alloy in the present invention can reach 1100-1300 MPa and 15-19.5% IACS respectively after deformation heat treatment, and is widely applicable to the fields of ultra-high strength conductive connectors, elastic elements, etc.

[0041] The present invention improves the distribution of Ti element; Ti element in titanium bronze alloy is concentrated at grain boundary during temperature controlled hot rolling, but not in the form of discontinuous precipitation phase (β-Cu 4 In the subsequent cold rolling process, the grains are gradually elongated, and the Ti element is enriched outside the fibrous deformed grains after aging treatment, forming a strip-like distribution of the Ti element, such as Figure 1 shown.

[0042] The present invention refines the grain size; the addition of Fe element can effectively refine the cast grain size of titanium bronze alloy by forming primary Ti-Fe phase, and inhibit the migration of grain boundaries during hot rolling. At the same time, temperature-controlled hot rolling can effectively avoid grain coarsening after solution treatment, and further improve the uniformity of the structure of titanium bronze alloy. The average grain size of the obtained hot-rolled titanium bronze alloy is less than 5 μm; more preferably, the average grain size is only 3.5 μm.

[0043] The invention shortens the process flow and improves production efficiency; the invention does not require solid solution treatment, can significantly shorten the production cycle of titanium bronze alloy, and promotes short-process production of titanium bronze strip. Severe cold plastic deformation significantly accelerates the nucleation and precipitation process of Ti element, which increases the precipitation strengthening rate and peak aging rate of titanium bronze alloy, and helps to further improve the production efficiency of titanium bronze alloy.

[0044] In order to further illustrate the present invention, the technical solutions provided by the present invention are described in detail below in conjunction with embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0045] Example 1 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0046] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 500°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0047] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0048] (4) Aging: The cold-rolled titanium bronze alloy obtained in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 350°C and the holding time is 1 h. After being taken out, the alloy is air-cooled.

[0049] Example 2 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0050] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 500°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0051] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0052] (4) Aging: The cold-rolled titanium bronze alloy obtained in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 350°C and the holding time is 2 h. After being taken out, the alloy is air-cooled.

[0053] Example 3 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0054] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 500°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0055] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0056] (4) Aging: The cold-rolled titanium bronze alloy in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0057] Example 4 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0058] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 500°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0059] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0060] (4) Aging: The cold-rolled titanium bronze alloy in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 2 h. After being taken out, it is air-cooled.

[0061] Example 5 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0062] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 500°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0063] (3) First step of cold rolling: The hot-rolled titanium bronze alloy in (2) is cold rolled, and the thickness is deformed from 5 mm to 0.5 mm, and the true strain becomes 2.3.

[0064] (4) Intermediate aging: The cold-rolled titanium bronze alloy in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 300°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0065] (5) Second cold rolling: The titanium bronze strip in (4) is further cold rolled, with the thickness being deformed from 0.5 mm to 0.1 mm and the true strain being 1.6.

[0066] (6) Aging: The cold-rolled titanium bronze alloy in (5) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0067] Example 6 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0068] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 650°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0069] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0070] (4) Aging: The cold-rolled titanium bronze alloy obtained in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 350°C and the holding time is 1 h. After being taken out, the alloy is air-cooled.

[0071] Example 7 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0072] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 650°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0073] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0074] (4) Aging: The cold-rolled titanium bronze alloy obtained in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 350°C and the holding time is 2 h. After being taken out, the alloy is air-cooled.

[0075] Example 8 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0076] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 650°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0077] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0078] (4) Aging: The cold-rolled titanium bronze alloy in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0079] Example 9 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0080] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 650°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0081] (3) Cold rolling: The hot-rolled titanium bronze alloy in (2) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0082] (4) Aging: The cold-rolled titanium bronze alloy in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 2 h. After being taken out, it is air-cooled.

[0083] Example 10 This embodiment provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0084] (2) Hot rolling: The ingots in (1) were placed in a box-type resistance furnace and kept at 850°C for 1 h before being taken out for hot rolling. The temperature changes during the hot rolling process were recorded by a thermocouple. The initial and final rolling temperatures were controlled at 820°C and 650°C, respectively. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then quenched in water and cooled to room temperature.

[0085] (3) First step of cold rolling: The hot-rolled titanium bronze alloy in (2) is cold rolled, and the thickness is deformed from 5 mm to 0.5 mm, and the true strain becomes 2.3.

[0086] (4) Intermediate aging: The cold-rolled titanium bronze alloy in (3) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 300°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0087] (5) Second step of cold rolling: The titanium bronze strip in (4) is further cold rolled, with the thickness being deformed from 0.5 mm to 0.1 mm and the true strain being 1.6.

[0088] (6) Aging: The cold-rolled titanium bronze alloy in (5) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0089] Comparative Example 1 This comparative example provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0090] (2) Hot rolling: The ingot in (1) was placed in a box-type resistance furnace, kept at 850°C for 1 hour, and then taken out and quickly hot rolled. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then air-cooled to room temperature.

[0091] (3) Solution treatment: The hot-rolled titanium bronze alloy in (2) is placed in a box-type resistance furnace for solution treatment at a solution temperature of 850°C and a holding time of 1 h. After being taken out, it is quickly water quenched.

[0092] (4) Cold rolling: The solid solution titanium bronze alloy in (3) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0093] (5) Aging: The cold-rolled titanium bronze alloy obtained in (4) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 350°C and the holding time is 1 hour. After being taken out, the alloy is air-cooled.

[0094] Comparative Example 2 This comparative example provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0095] (2) Hot rolling: The ingot in (1) was placed in a box-type resistance furnace, kept at 850°C for 1 hour, and then taken out and quickly hot rolled. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then air-cooled to room temperature.

[0096] (3) Solution treatment: The hot-rolled titanium bronze alloy in (2) is placed in a box-type resistance furnace for solution treatment at a solution temperature of 850°C and a holding time of 1 h. After being taken out, it is quickly water quenched.

[0097] (4) Cold rolling: The solid solution titanium bronze alloy in (3) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0098] (5) Aging: The cold-rolled titanium bronze alloy obtained in (4) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 350°C and the holding time is 2 h. After being taken out, the alloy is air-cooled.

[0099] Comparative Example 3 This comparative example provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0100] (2) Hot rolling: The ingot in (1) was placed in a box-type resistance furnace, kept at 850°C for 1 hour, and then taken out and quickly hot rolled. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then air-cooled to room temperature.

[0101] (3) Solution treatment: The hot-rolled titanium bronze alloy in (2) is placed in a box-type resistance furnace for solution treatment at a solution temperature of 850°C and a holding time of 1 h. After being taken out, it is quickly water quenched.

[0102] (4) Cold rolling: The solid solution titanium bronze alloy in (3) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0103] (5) Aging: The cold-rolled titanium bronze alloy in (4) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0104] Comparative Example 4 This comparative example provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0105] (2) Hot rolling: The ingot in (1) was placed in a box-type resistance furnace, kept at 850°C for 1 hour, and then taken out and quickly hot rolled. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then air-cooled to room temperature.

[0106] (3) Solution treatment: The hot-rolled titanium bronze alloy in (2) is placed in a box-type resistance furnace for solution treatment at a solution temperature of 850°C and a holding time of 1 h. After being taken out, it is quickly water quenched.

[0107] (4) Cold rolling: The solid solution titanium bronze alloy in (3) was cold rolled from 5 mm to 0.1 mm in thickness (completed in one step, excluding intermediate aging), and the true strain was 3.91.

[0108] (5) Aging: The cold-rolled titanium bronze alloy in (4) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 2 h. After being taken out, it is air-cooled.

[0109] Comparative Example 5 This comparative example provides a short-process preparation method for an ultra-high-strength conductive titanium bronze alloy strip, wherein the actual composition of the titanium bronze alloy ingot is a Cu-3.1Ti-0.2Fe (wt.%) alloy, and the preparation steps include: (1) Vacuum casting: Pure copper, pure titanium and Cu-10Fe master alloy are used as raw materials. The raw materials are placed in a high-frequency vacuum induction melting furnace and heated to 1150°C. After the melt is completely melted, it is kept at 1200°C for 20 minutes before casting and cooled to room temperature.

[0110] (2) Hot rolling: The ingot in (1) was placed in a box-type resistance furnace, kept at 850°C for 1 hour, and then taken out and quickly hot rolled. The thickness of the hot rolled plate was deformed from 20 mm to 5 mm, with a total deformation of 75%, and then air-cooled to room temperature.

[0111] (3) Solution treatment: The hot-rolled titanium bronze alloy in (2) is placed in a box-type resistance furnace for solution treatment at a solution temperature of 850°C and a holding time of 1 h. After being taken out, it is quickly water quenched.

[0112] (4) First step of cold rolling: The solid solution titanium bronze alloy in (3) is cold rolled, and the thickness is deformed from 5 mm to 0.5 mm, and the true strain is 2.3.

[0113] (5) Intermediate aging: The cold-rolled titanium bronze alloy in (4) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 300°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0114] (6) Second step of cold rolling: The titanium bronze strip in (5) is further cold rolled, with the thickness being deformed from 0.5 mm to 0.1 mm and the true strain being 1.6.

[0115] (7) Aging: The cold-rolled titanium bronze alloy in (6) is placed in a box-type resistance furnace and the surface is wrapped with charcoal for aging treatment. The aging temperature is 400°C and the holding time is 1 hour. After being taken out, it is air-cooled.

[0116] The properties of the titanium bronze alloy strips prepared in Examples 1 to 10 and Comparative Examples 1 to 4 were tested, and the test results are shown in Table 1. The test standard for tensile strength in Table 1 is GB / T 228.2-2015.

[0117] Table 1 Performance of titanium bronze alloy strips prepared in Examples 1 to 10 and Comparative Examples 1 to 5

[0118] As shown in Table 1, compared with Comparative Examples 1 to 5, Examples 1 to 5 of the present invention significantly increase the tensile strength of the titanium bronze alloy strip obtained by controlling the temperature of the hot rolling process (controlling the hot final rolling temperature) while omitting the step of solid solution treatment. Appropriate intermediate aging treatment in Examples 5 and 10 can further improve the electrical conductivity of the alloy.

[0119] From the above examples, it can be seen that the present invention can make the Ti element in the titanium bronze alloy localized at the grain boundary through the temperature-controlled hot rolling process, but it does not form a discontinuous precipitation phase (β-Cu 4 Ti phase). In the subsequent cold rolling process, the grains are gradually elongated, and the Ti element is enriched outside the fibrous deformed grains after aging treatment, forming a strip-like distribution of the Ti element, thereby improving the distribution of the Ti element; at the same time, the present invention effectively refines the cast grain size of the titanium bronze alloy by adding the Fe element to form a primary Ti-Fe phase, and inhibits the migration of grain boundaries during the hot rolling process. Therefore, the titanium bronze alloy material obtained by the preparation method provided by the present invention has both high strength and electrical conductivity, while shortening the processing steps of the titanium bronze alloy material, improving the preparation efficiency of the titanium bronze alloy material, and can effectively meet the practical application needs of ultra-high-strength conductive copper alloy strips in the fields of electronic elastic components, connectors, etc.

[0120] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for preparing a titanium bronze alloy material, characterized in that: The titanium bronze alloy material comprises the following components in percentage by weight: Ti 1.5-5wt.%, Fe 0.06-0.5wt.%, and the balance is Cu; The following steps are involved: Vacuum casting the raw materials for the titanium bronze alloy material to obtain a titanium bronze alloy ingot; The titanium bronze alloy ingot is subjected to hot rolling treatment, wherein the initial hot rolling temperature of the hot rolling treatment is greater than the final hot rolling temperature, to obtain a hot-rolled titanium bronze alloy; cold-rolling the hot-rolled titanium bronze alloy to obtain a cold-rolled titanium bronze alloy; The cold-rolled titanium bronze alloy is subjected to aging treatment to obtain the titanium bronze alloy material.

2. The preparation method according to claim 1, characterized in that: The vacuum casting comprises the following steps: The raw materials for preparing the titanium bronze alloy material are smelted to obtain a melt; the raw materials for preparing the titanium bronze alloy material include pure copper, pure titanium and copper-iron intermediate alloy, and the smelting temperature is 1150-1250° C.; The melt is sequentially subjected to heat preservation treatment, casting treatment and quenching and cooling in water to obtain a titanium bronze alloy ingot; the heat preservation treatment temperature is 1200-1250° C., and the heat preservation time is 20-30 minutes.

3. The preparation method according to claim 1, characterized in that: The hot rolling process is a multi-pass hot rolling process, the temperature of the first hot rolling process is 800-850°C, and the temperature of the last hot rolling process is 400-650°C.

4. The preparation method according to claim 1 or 3, characterized in that: The total deformation of the hot rolling process is 60-75%; The cooling method after the hot rolling treatment is: quenching in water to room temperature.

5. The preparation method according to claim 1, characterized in that: The total true strain of the cold rolling process is 1.8-5; the deformation of each cold rolling process is 15-50%.

6. The preparation method according to claim 1 or 5, characterized in that: The cold rolling treatment is a one-step cold rolling treatment without intermediate aging treatment or a multi-step cold rolling treatment with intermediate aging treatment.

7. The preparation method according to claim 6, characterized in that: The cold rolling treatment is a multi-step cold rolling treatment including an intermediate aging treatment, and the cold rolling true strain before the first aging treatment is greater than 0.

8.

8. The preparation method according to claim 6, characterized in that: The multi-step cold rolling treatment including the intermediate aging treatment includes sequentially performing: a first step cold rolling treatment, an intermediate aging treatment and a second step cold rolling treatment.

9. The preparation method according to claim 1, characterized in that: The temperature of the aging treatment is 200-450° C., and the insulation time is 1-8 hours.

10. The titanium bronze alloy material prepared by the preparation method according to any one of claims 1 to 9.

Images