Ultrahigh-strength high-conductivity copper alloy and preparation method thereof

Abstract

The invention discloses an ultrahigh-strength high-conductivity copper alloy. The copper alloy comprises the following components of, by weight, 4.6-6.0% of Ni, 1.0-2.0% of Co, 1.0-2.0% of Si, 0.05-0.4% of Mg, 0.01-0.1% of Sr, 0.01-0.1% of Nb and the balance Cu, wherein the sum of the mass percentages of all the components is 100%. The preparation method of the copper alloy comprises the steps ofsmelting, casting, homogenization, hot rolling, solid solution treatment and combined deformation heat treatment. According to the ultrahigh-strength high-conductivity copper alloy, an element Be which is easy to burn is replaced by elements which are environment-friendly, easy to add and not easy to burn, second-phase particles are separated out through alloy element component design to prevent dislocation movement, and meanwhile, the solid solution elements in a matrix are reduced; a special two-stage hot rolling and solid solution treatment process is adopted, so that tissues are more uniform, coarse precipitation phase redissolution is promoted, and tissue preparation is provided for subsequent deformation heat treatment; and the precipitation of the nano-reinforced phase is promoted through combined deformation heat treatment, so that the system alloy has excellent mechanical property and conductivity, and the obtained copper alloy is excellent in mechanical property and high in conductivity.

Description

technical field [0001] The invention belongs to the technical field of copper alloy processing, and in particular relates to an ultrahigh-strength and high-conductivity copper alloy and a preparation method thereof. Background technique [0002] Beryllium copper alloy is a typical age-strengthened copper alloy. It is an ideal ultra-high-strength and high-conductivity copper alloy. The tensile strength can reach more than 1000MPa, and it has high elastic modulus and electrical conductivity, wear resistance, corrosion resistance and high temperature resistance. Excellent properties such as stress relaxation. Widely used in relays, potentiometers, switch contacts, elastic sensitive components in the electronics industry, and wear-resistant devices such as bearings, bushings, bearing bushes, and high-pressure oil pumps used in high-load and strong corrosive environments, with modern science and technology and industry With the rapid development of the rapid development of coppe...

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Problems solved by technology

[0003] Patent CN 106987738A discloses a Cu-Ni-Si-Co-Ti-RE copper alloy and its preparation method, its composition contains by weight percentage: 0.5%-2.0% Ni, 0.2%-0.9% Si, 0.5% ~2.0% Co, 0.1%~0.5% Ti, 0.05%~0.2% RE, the rest is Cu, wherein RE is one or more of Ce, La and Y, and the conductivity is 45%~55% IACS, but the strength is less than 1000MPa, the preparation process needs to go through casting, hot rolling, spray treatment, face milling, rough rolling, bell annealing, intermediate rolling, bright annealing, finishing rolling with bottom, bright annealing, finishing rolling, bell jar Annealing process, the preparation method is complicated, and the production cycle is long

[0004] Patent CN 101541987B discloses a Cu-Ni-Si-Co copper alloy and its manufacturing method, its composition contains by weight percentage: 1.0%-2.5% Ni, 0.3%-1.2% Si, 0.5%-2.5% The remaining part is composed of Cu and unavoidable impurities. The copper alloy has a conductivity of 44% IACS, but the alloy strength can only reach 850MPa, which cannot meet the ultra-high strength requirements of specific processes.

[0005] Patent CN 107090553A discloses a Cu-Ni-Co-V-Cr-Mo-Zn-Mn-Ti alloy, its composition contains by weight percentage: 4.8% to 7.6% Ni, 2.3% to 5.7% V, 1.7 %~2.2% Cr, 3.5%~5.7% Mo, 1.5%~2.3% Zn, 1.2%~2.3% Mn, 0.7%~2.5% Ti, of which the Co content is only 0.05%~0.10%, The balance is Cu, the strength of the copper alloy reaches 1300MPa, but the electrical conductivity is only 10% IACS

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