CN109487116B - High-strength titanium-copper alloy strip suitable for conductive elastic component and preparation method thereof - Google Patents

High-strength titanium-copper alloy strip suitable for conductive elastic component and preparation method thereof Download PDF

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CN109487116B
CN109487116B CN201811428341.3A CN201811428341A CN109487116B CN 109487116 B CN109487116 B CN 109487116B CN 201811428341 A CN201811428341 A CN 201811428341A CN 109487116 B CN109487116 B CN 109487116B
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rolling
alloy
annealing
finished
alloy strip
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CN109487116A (en
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魏然
王超
张乐
吕晨熠
章清泉
李国超
吴会云
文新理
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Beijing Beiye Functional Materials Corp
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Beijing Beiye Functional Materials Corp
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C9/00Alloys based on copper
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/08Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of copper or alloys based thereon

Abstract

A high-strength titanium copper alloy strip suitable for conductive elastic components and a preparation method thereof belong to the technical field of titanium copper alloy strips. The chemical components of the alloy comprise, by weight, 0-0.01% of C, 2.6-3.4% of Ti, 0.001-0.2% of Ce, less than or equal to 0.3% of W + Ta + Hf + Fe, and the balance of Cu and inevitable impurities. The final product performance is as follows: the tensile strength is 1149-1230 MPa, the yield strength is 1028-1100 MPa, the thermal conductivity is 92-125W/(m.DEG C), the electrical conductivity is 19-27% IACS, the grain size is 2-15 μm, and the hardness is 320-370 HV. The alloy production process comprises the following steps: vacuum smelting, forging, hot rolling, cold rolling, annealing, finished product rolling, aging, stress relief annealing and the like. The alloy strip has the advantages that the alloy strip has high strength, high thermal conductivity and high electrical conductivity, and the matching of the alloy strip and the alloy strip meets the requirements of the conductive elastic component on the strength and the heat dissipation performance.

Description

High-strength titanium-copper alloy strip suitable for conductive elastic component and preparation method thereof
Technical Field
The invention belongs to the technical field of titanium-copper alloy, and particularly provides a high-strength titanium-copper alloy strip suitable for conductive elastic components and a preparation method thereof.
Background
The ultrahigh-strength copper alloy material is a strategic emerging industry in China, and the ultrahigh-strength elastic copper alloy mainly refers to conductive elastic copper alloy with the tensile strength of more than 1000MPa, and is mainly applied to preparation of conductive elastic components, such as machine instruments, dies, temperature controllers, relays, automobile parts and the like. Beryllium bronze is a typical precipitation strengthening alloy, has a series of advantages of high strength, hardness and elasticity limit, corrosion resistance, wear resistance, fatigue resistance, low temperature resistance and the like, is widely applied and is known as the king of colored elastic materials. However, beryllium in beryllium bronze is toxic, and the problem of safety in production and use of beryllium bronze cannot be ignored.
Titanium bronze is a novel copper-based precipitation-strengthened elastic alloy appearing at the end of the 50 th century, and researchers of multiple countries develop researches on alloy components, mechanical properties and the like of the titanium bronze, and the titanium bronze is partially used for replacing beryllium bronze to manufacture elastic elements, interconnection devices, wear-resistant parts and the like of precision instruments and meters. At present, the titanium-copper alloy grades mainly comprise HPTC, NKT322 and YCuT-M, YCuT-F. With the development and progress of science and technology, in order to adapt to more and more harsh working conditions, the requirements on the strength, the heat dissipation performance and the like of a conductive elastic component are higher and higher, so that higher requirements are provided for the matching of high strength, high heat conductivity and high electric conductivity of the titanium-copper alloy: the tensile strength is more than or equal to 1100MPa, the yield strength is more than or equal to 1000MPa, the heat conductivity coefficient is more than or equal to 90W/(m.DEG C), and the electric conductivity is more than or equal to 19 percent IACS.
Disclosure of Invention
The invention aims to provide a high-strength titanium copper alloy strip suitable for conductive elastic components and a preparation method thereof, so that the tensile strength of the alloy strip is more than or equal to 1100MPa, the yield strength of the alloy strip is more than or equal to 1000MPa, the heat conductivity coefficient is more than or equal to 90W/(m.DEG C), and the conductivity of the alloy strip is more than or equal to 19% IACS.
The high-strength titanium-copper alloy strip comprises the following chemical components in percentage by mass: 0-0.01% of C, 2.6-3.4% of Ti, 0.001-0.2% of Ce, 0-0.3% of W, Ta and Fe, and the balance of Cu and inevitable impurities.
The principle of the invention is as follows:
c: the addition of the element C, on one hand, the element C is combined with Ti to generate TiC which is dispersed and distributed in a grain boundary, so that the strength of the alloy can be obviously improved; on the other hand, consumption of supersaturated Ti is advantageous for lowering the resistivity of the alloy.
Ce: the addition of Ce element is beneficial to purifying the alloy grain boundary and improving the processing performance of the alloy.
W, Ta, Hf and Fe: the addition of trace amounts of W, Ta and Hf can be used as crystal cores to refine crystal grains, so that the solid solution strengthening effect is achieved, the strength of the alloy is further improved, and the addition of Fe improves the processability of the alloy.
The preparation of the alloy adopts an air induction furnace for smelting so as to fully reduce and remove the content of gas and impurities in the alloy. The smelted alloy is subjected to the working procedures of forging, hot rolling, cold rolling and annealing (solid solution) alternately, cold rolling, aging, stress relief annealing and the like to obtain a finished product, and the specific process steps and the controlled technical parameters are as follows:
(1) vacuum smelting: the related raw materials are mixed in proportion and then are loaded into a crucible. The alloy refining temperature is 1200-1250 ℃, and the tapping temperature is 1160-1200 ℃;
(2) forging and hot rolling: forging the blank into a flat blank with the thickness of 60-80 mm at the temperature of 700 ℃ and 920 ℃; hot rolling the forged flat blank at the temperature of 700-920 ℃, wherein the total deformation of the hot rolling is 90-99%;
(3) cold rolling: controlling the initial rolling deformation of the alloy to be 50-80%;
(4) annealing (solid solution): annealing the alloy strip after the primary rolling in a protective atmosphere, wherein the annealing (solid solution) temperature is 700-850 ℃; the heat preservation time is 0.5-10 min;
(5) rolling a finished product: rolling deformation of the finished product is 10-50%;
(6) aging of a finished product: carrying out aging treatment after rolling the finished product, wherein the aging temperature is 300-500 ℃, and the heat preservation time is 1-24 h;
(7) stress relief annealing: and performing stress relief annealing according to the requirement.
And (3) and (4) are alternately carried out according to the preparation requirement to reach a proper specification.
The alloy strip produced by the method has the tensile strength of 1149-1230 MPa, the yield strength of 1028-1100 MPa, the heat conductivity of 92-125W/(m.cndot.), the electric conductivity of 19-27% IACS, the grain size of 2-15 microns and the hardness of 320-370 HV. Compared with the prior titanium copper alloy strip (comparative examples 1 and 2), the alloy strip provided by the invention simultaneously meets the requirements of high strength, high thermal conductivity and high electrical conductivity.
Detailed description of the invention
The technical solution of the present invention will be specifically described below by way of examples.
Example 1:
the alloy comprises the following specific chemical components in percentage by mass: c: 0.005%, Ti: 2.7%, Ce: 0.05%, W: 0.03%, Fe: 0.16% and the balance Cu and inevitable impurities.
Electrolytic copper with the purity of 99.9 percent, sponge titanium with the purity of 99.9 percent, C, Fe and Ce are mixed according to the proportion and then are filled into a crucible. Smelting in a vacuum induction furnace, wherein the alloy refining temperature is 1250 ℃, the tapping temperature is 1200 ℃, and casting into steel ingots. The steel ingot is heat-preserved and forged into a flat blank with the thickness of 80mm at 850 ℃, and is heat-preserved and hot-rolled at 900 ℃, wherein the hot-rolling deformation is 94%. And (3) carrying out initial rolling on the hot-rolled flat blank, wherein the initial rolling deformation is 80%, and then annealing at 850 ℃ for 120 s. After annealing, the steel sheet was rolled again to a strain of 80%, and then subjected to solid solution at 850 ℃ for 90 seconds. And (5) rolling the finished product of the strip in the solid solution state, wherein the deformation is 40%. Then aging is carried out at 400 ℃ for 8 h. Specific parameters and performance details are shown in table 1.
Example 2:
the alloy comprises the following specific chemical components in percentage by mass: c: 0.003%, Ti: 3.0%, Ce: 0.03%, Ta: 0.02% and the balance Cu and inevitable impurities. The preparation was carried out according to the corresponding composition and procedure of example 2 in table 1.
Example 3:
the alloy comprises the following specific chemical components in percentage by mass: c: 0.008%, Ti: 3.2%, W: 0.02%, Ta: 0.03%, Fe: 0.18% of Cu and inevitable impurities. The preparation was carried out according to the corresponding composition and procedure of example 3 in table 1.
Example 4:
the alloy comprises the following specific chemical components in percentage by mass: c: 0.006%, Ti: 3.4%, Ce: 0.03%, Hf: 0.03%, Fe: 0.20% of Cu and inevitable impurities. The preparation was carried out according to the corresponding composition and procedure of example 4 in table 1.
Example 5:
the alloy comprises the following specific chemical components in percentage by mass: c: 0.007%, Ti: 2.9%, Ce: 0.03%, W: 0.10%, Ta: 0.05% and the balance Cu and inevitable impurities. The preparation was carried out according to the composition and procedure corresponding to example 5 in table 1.
TABLE 1

Claims (3)

1. The high-strength titanium-copper alloy strip suitable for the conductive elastic component is characterized by comprising 0-0.01% of C, 2.6-3.4% of Ti, 0.001-0.2% of Ce, less than or equal to 0.3% of W + Ta + Hf + Fe and the balance of Cu and inevitable impurities in percentage by mass;
the alloy strip has the tensile strength of 1149-1230 MPa, the yield strength of 1028-1100 MPa, the heat conductivity of 92-125W/(m.DEG C), the electrical conductivity of 19-27% IACS, the grain size of 2-15 mu m and the hardness of 320-370 HV;
the specific process steps and the controlled technical parameters for preparing the alloy strip are as follows:
(1) vacuum smelting: mixing related raw materials in proportion and then loading the mixture into a crucible; the alloy refining temperature is 1200-1250 ℃, and the titanium copper alloy discharging temperature is 1160-1200 ℃;
(2) forging and hot rolling: forging the blank into a flat blank with the thickness of 60-80 mm at 700-920 ℃; hot rolling the forged flat blank at 700-920 ℃, wherein the total deformation of the hot rolling is 90-99%;
(3) cold rolling: controlling the initial rolling deformation of the alloy to be 50-80%;
(4) annealing: annealing the alloy strip after the primary rolling in a protective atmosphere, wherein the annealing temperature is 700-850 ℃; the heat preservation time is 0.5-10 min;
(5) rolling a finished product: rolling deformation of the finished product is 10-50%;
(6) aging of a finished product: carrying out aging treatment after rolling the finished product, wherein the aging temperature is 300-500 ℃, and the heat preservation time is 1-24 h;
(7) stress relief annealing: and performing stress relief annealing according to the requirement.
2. The preparation method of the high-strength titanium-copper alloy strip of claim 1, which is characterized by comprising the following specific process steps and controlled technical parameters:
(1) vacuum smelting: mixing related raw materials in proportion and then loading the mixture into a crucible; the alloy refining temperature is 1200-1250 ℃, and the titanium copper alloy discharging temperature is 1160-1200 ℃;
(2) forging and hot rolling: forging the blank into a flat blank with the thickness of 60-80 mm at 700-920 ℃; hot rolling the forged flat blank at 700-920 ℃, wherein the total deformation of the hot rolling is 90-99%;
(3) cold rolling: controlling the initial rolling deformation of the alloy to be 50-80%;
(4) annealing: annealing the alloy strip after the primary rolling in a protective atmosphere, wherein the annealing temperature is 700-850 ℃; the heat preservation time is 0.5-10 min;
(5) rolling a finished product: rolling deformation of the finished product is 10-50%;
(6) aging of a finished product: carrying out aging treatment after rolling the finished product, wherein the aging temperature is 300-500 ℃, and the heat preservation time is 1-24 h;
(7) stress relief annealing: and performing stress relief annealing according to the requirement.
3. The method of claim 2, wherein steps (3) and (4) are alternated to appropriate specifications as required for preparation.
CN201811428341.3A 2018-11-27 2018-11-27 High-strength titanium-copper alloy strip suitable for conductive elastic component and preparation method thereof Active CN109487116B (en)

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CN110923499B (en) * 2019-12-27 2021-02-05 宁波博威合金材料股份有限公司 Ce and B-containing titanium bronze alloy strip and preparation method thereof
CN112251626A (en) * 2020-09-16 2021-01-22 中铝材料应用研究院有限公司 Cu-Ti series alloy with ultra-fine grain structure and preparation method thereof
CN113005324B (en) * 2021-02-23 2021-12-07 江西理工大学 Copper-titanium alloy and preparation method thereof

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US4749548A (en) * 1985-09-13 1988-06-07 Mitsubishi Kinzoku Kabushiki Kaisha Copper alloy lead material for use in semiconductor device
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JP2008248355A (en) * 2007-03-30 2008-10-16 Nikko Kinzoku Kk Titanium copper for electronic parts, and electronic parts using the same
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