Method for preparing ultra-fine grain high-conductivity Cu-Cr-Zr alloy by medium-temperature multi-axial forging

By employing a medium-temperature multi-directional forging method, combined with grain fragmentation and dynamic recrystallization, the problems of decreased conductivity and easy cracking during room-temperature multi-directional forging of Cu-Cr-Zr alloys during cold rolling deformation have been solved. This method enables the preparation of ultrafine-grained alloys with high hardness and high conductivity, which are suitable for lead frames, resistance welding electrodes, and other fields.

CN122322381APending Publication Date: 2026-07-03ZHONGBEI UNIV
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Patent Information

Application Number
CN202610738649.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-27
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing Cu-Cr-Zr alloys exhibit decreased electrical conductivity and difficulty in achieving significant grain refinement during cold rolling deformation. They are also prone to cracking during room temperature multi-directional forging, making industrial production difficult.

Method used

The medium-temperature multi-directional forging method is adopted. By performing multi-pass multi-directional forging at 350~550℃, combined with grain crushing and dynamic recrystallization, the precipitation of Cr and Zr atoms is promoted. The number of forging passes and the amount of reduction per pass are optimized, and the deformation temperature and holding time are controlled to achieve grain refinement and precipitation strengthening.

Benefits of technology

It achieves a uniform ultrafine grain structure at the submicron level, significantly improves the alloy's hardness and conductivity, simplifies the process, is suitable for large-size bulk materials, and is easy to industrialize.

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Abstract

This invention belongs to the field of materials forming technology and discloses a method for preparing ultrafine-grained, highly conductive Cu-Cr-Zr alloy by medium-temperature multi-directional forging. The specific technical solution is as follows: a Cu-Cr-Zr alloy billet is provided and subjected to solution treatment, followed by water cooling to obtain a supersaturated solid solution; the solution-treated billet and the mold are heated together to a forging temperature of 350~550℃, and the billet is subjected to multi-pass multi-directional forging. Each pass includes upsetting deformation along the three orthogonal directions X, Y, and Z of the billet. Through multi-directional forging under medium-temperature conditions, the Cu-Cr-Zr alloy achieves large plastic deformation, and while accumulating large strain, the grains are significantly refined to obtain a uniform ultrafine-grained structure, thereby achieving a good match between hardness and conductivity. Under optimal process conditions, the grain size of the alloy can be refined to 0.52 μm, the hardness can reach above 178 HV, and the conductivity can reach 67.1% IACS.
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