Preparation method of copper alloys with high strength and high electric conductivity
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A technology of high conductivity and copper alloy, which is applied in the preparation of copper alloy materials and the preparation of high-strength and high-conductivity aging copper alloy, which can solve the problems of difficult control of alloy composition and limited strengthening effect
Inactive Publication Date: 2011-06-29
CHANGZHOU UNIV
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[0006] The purpose of the present invention is to provide a method for preparing a high-strength, high-conductivity aging copper alloy, which overcomes the limited strengthening effect of a single component, reduces the adverse effects of excess elements on conductivity, and avoids the proble
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[0026] Example 1: Pure chromium and oxygen-free pure copper with a purity of 98.5% are smelted in a vacuum medium frequency induction melting furnace according to the Cu-0.5% Cr ratio at a melting temperature of 1250 to 1280 ℃, after holding for 10 to 15 minutes, It is poured and cut into a square material of 12.4 mm×12.4 mm×80 mm along the longitudinal direction of the ingot.
[0027] The solution treatment temperature is 1000℃, the solution time is 0.5h, and it is cooled in 5% NaCl aqueous solution.
[0028] The inner angle of the equal channel deformation mold is 110°, the outer angle of the mold is 0°, and the deformation speed at room temperature is about 0.2mm / s. The samples with the equal channel deformation 4 times and 8 passes are aging treated or the equal channel deformed 4 passes, 8 times The samples of the pass are subjected to 90% rolling deformation before aging treatment, the aging temperature is 450 ℃, and the aging time is 1 h.
[0029] The performance comparison o...
Example Embodiment
[0033] Example 2: Pure chromium, pure zirconium and oxygen-free pure copper are smelted in a vacuum medium frequency induction melting furnace according to the ratio of Cu-0.5%Cr-0.2%Zr. The melting temperature is 1250~1280 ℃, and the temperature is kept for 10~15 minutes. After that, it is poured and cut into square materials of 12.4 mm×12.4 mm×80 mm along the longitudinal direction of the ingot.
[0034] The solution treatment temperature is 1000℃, the solution time is 0.5h, and it is cooled in 5% NaCl aqueous solution.
[0035] The inner angle of the equal channel deformation mold is 110°, the outer angle of the mold is 0°, and the deformation speed at room temperature is about 0.2mm / s. After 8 passes of the equal channel deformation, the aging treatment is carried out. The aging temperature is 450°C and the aging time is 1h.
[0036] The channel deformation of Cu-0.5%Cr-0.2%Zr alloy is 8 passes, and the tensile strength and electrical conductivity at room temperature reach 530MPa...
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Abstract
The invention relates to a preparation method of copper alloy materials, in particular to a preparation method of aged copper alloys with high strength and high electric conductivity. The aged copper alloys comprise copper chromium (Cu-Cr) alloy, copper zirconium (Cu-Zr) alloy and copper chromium zirconium (Cu-Cr-Zr) alloy, wherein the content of Cr is 0.1-0.6% and the content of Zr is 0.01-0.5%. The preparation method mainly comprises the following steps: according to the percentages by weight, casting by mixed smelting to obtain the Cu-Cr alloy, the Cu-Zr alloy and the Cu-Cr-Zr alloy; performing solution treatment on the cast ingots; performing equal channel deformation at room temperature on the copper alloys after solution treatment; then performing the machining processes such as extruding, drawing or rolling and the like on the Cu-Cr alloy, the Cu-Zr alloy and the Cu-Cr-Zr alloy after equal channel deformation; and finally performing aging treatment on the workpieces. The preparation method overcomes the defect of limited strengthening effect of single components, reduces the adverse effect of excessive elements on the electric conductivity, acquires ultra-fine grains under the conditions of not changing the shapes and sizes of samples, can be combined with the machining processes such as extruding, drawing or rolling and the like, can be used for producing a product with an expected shape, and fully plays the roles of fine grain strengthening and aging strengthening.
Description
technical field [0001] The invention relates to a method for preparing a copper alloy material, in particular to a method for preparing a high-strength, high-conductivity aging-type copper alloy, and belongs to the technical field of nonferrous metal processing. Background technique [0002] High-strength and high-conductivity copper alloys are widely used in lead frames, welding electrodes, switch contacts, electric train overhead wires, etc., and can also be used in heat exchange environments that are not directly related to electrical conductivity; at present, high-strength and high-conductivity copper alloys are mainly Cu -Zr, Cu-Cr, Cu-Cd, Cu-Ni, Cu-Fe, Cu-Ag, Cu-Nb and other alloys and their composite materials, the primary problem encountered in the high-strength and high-conductivity process of aging copper alloys is The strengthening effect of a small amount of alloying elements is not obvious, and a large amount of alloying elements will deteriorate the electrical ...
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