A high-strength and high-conductivity copper-chromium-zirconium alloy and its low-temperature deformation preparation method

Abstract

The invention relates to the field of copper alloy and application thereof, in particular to a high-strength high-conductivity copper chromium zirconium alloy and a low-temperature deforming preparingmethod thereof. The alloy comprises chemical components including, by mass percent, 0.2 to 1.5% of chromium, 0.05 to 0.2% of zirconium and the balance copper and inevitable impurities. The typical structure of the alloy comprises a copper matrix of a nanoscale deformation structure and dispersed distribution chromium particles, the typical nanostructure is a deformation twin crystal bundle, the twin crystal layer piece thickness ranges from 20 to 100 nanometers, the twin crystal bundle size ranges from several microns to several hundred microns, and the diameter of the dispersed distributionchromium particles ranges from 10 to 100 nanometers. The alloy has the 700 MPa stage strength, and meanwhile, the conductivity is within the 78 to 82% IACS range. The manufacturing method of the alloycomprises the steps of alloy blank casting heat machining and low-temperature deforming. The alloy has the advantages of being high in strength, high in conductivity, high in softening temperature, excellent in wear resisting and welding property and the like and can be suitable for the field of use of existing copper chromium zirconium alloy and the field with the higher requirement for strength-conductivity.

Description

technical field [0001] The invention relates to copper alloys and their application fields, in particular to a high-strength and high-conductivity copper-chromium-zirconium alloy strengthened by nano-twin structure and dispersed chromium particles, and a manufacturing method mainly characterized by low-temperature deformation. Background technique [0002] With the rapid development of power electronics, high-speed rail transit and other industries, higher and higher requirements are placed on the lightweight and low energy consumption of conductive components, which requires the use of key conductive components such as lead frames and high-speed railway contact wires. The conductive material has both high electrical conductivity and higher strength. The existing high-strength and high-conductivity materials are mainly copper alloys. This type of alloy will remain the most important conductor material for a long time in the future due to its excellent forming ability, moder...

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Problems solved by technology

However, since the formation and annihilation of internal defects in the metal are balanced during repeated deformation, such methods cannot continue to reduce the grain size and thus increase the strength of the alloy.

[0007] On the other hand, the high-density defect structure (such as: high-density dislocation) obtained by deformation and the high-density grain boundary accompanied by the reduction of grain size will also cause a large increase in the scattering cross-section during electron transport, which leads to While the strength of the alloy is improved, the electrical resistivity is significantly increased, and the electrical conductivity is significantly decreased

Increased defect density simultaneously increases strength and resistivity, a paradox that limits the development of conductive copper alloys to simultaneously achieve higher strength and conductivity

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