Processing method of high-obdurability and high-conductivity copper magnesium alloy

A technology of copper-magnesium alloy and processing method, which is applied in the processing field of high-strength, toughness and high-conductivity copper-magnesium alloy, can solve the problems of low conductivity and cumbersome processing methods of Cu-Cr alloy, and achieve the purpose of maintaining conductivity, improving strength and toughness, and processing The effect of simple process

Inactive Publication Date: 2013-01-23
HOHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the processing method of Cu-Cr alloy is relatively cumbersome, and the requirements for processing technology are relatively strict.
The processing method of Cu-Mg alloy is relatively simple. At present, the processing methods of Cu--Mg alloy mainly include up-drawing continuous casting and drawing and up-drawing continuous casting and extrusion plus drawing, but the Cu produced by these two processing methods --Although Mg alloy has good tensile strength (500MPa~550MPa), its electrical conductivity is less than 70%IACS
There is no report on the preparation of Cu-Mg alloy with high strength, toughness and high conductivity by ECAP processing method

Method used

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  • Processing method of high-obdurability and high-conductivity copper magnesium alloy

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Experimental program
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Effect test

Embodiment 1

[0023] Electrolytic copper and pure magnesium were selected as raw materials to prepare a copper-magnesium alloy with a magnesium content of 0.2%, and the up-drawing continuous casting technology and continuous hot extrusion were used to obtain a thermally deformed Cu-0.2wt%Mg alloy, that is, a copper-magnesium alloy rod. The magnesium in it is mainly in the form of solid solution in the magnesium matrix, and the average grain size is 5~8μm (see figure 1 ), the grain morphology is equiaxed. After 16 passes of continuous equal-channel angular extrusion at a temperature of 573K, the equal-channel angle in the mold is 90°, the alloy structure is significantly refined, and the grains are distributed in bands, with a length of about 1 μm and a width of about 200 nm (see figure 2 and image 3 ), the dislocation density inside the grains is low, and there are some twins. Due to the special microstructural characteristics in the ultrafine-grained copper-magnesium alloy, the tensile...

Embodiment 2

[0025] Electrolytic copper and pure magnesium were selected as raw materials to produce a copper-magnesium alloy with a magnesium content of 0.4%. Using upward continuous casting technology and continuous hot extrusion processing, a thermally deformed Cu-0.4wt%Mg alloy, namely a copper-magnesium alloy rod, was obtained. The magnesium in it is mainly in the form of solid solution in the magnesium matrix, and the average grain size is 8~10μm (see Image 6 ), the grain morphology is equiaxed. After 8 passes of continuous equal-channel angular extrusion at a temperature of 273K, the equal-channel angle in the mold is 120°, the alloy structure is obviously refined, and the grains are distributed in bands (see Figure 7 ). Compared with Cu-0.2wt%Mg alloy, the increase of magnesium content increases the effect of solid solution strengthening, so after 8 passes of continuous equal channel angular extrusion at 273K temperature, its tensile strength reaches 589MPa, and its elongation r...

Embodiment 3

[0027] The difference between embodiment 3 and embodiment 1 is only that electrolytic copper and magnesium are selected as raw materials to make a copper-magnesium alloy with a magnesium content of 0.1%, the extrusion temperature is 473K, and the equal passage angle in the mold is 100°, and the rest of the operations are the same Example 1.

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Abstract

The invention relates to a processing method of a high-obdurability and high-conductivity copper magnesium alloy, which comprises the following steps of: 1) with cathode copper and pure magnesium as raw materials, preparing the copper magnesium alloy with the magnesium content of 0.1-0.4 percent, and adopting an up-drawing continuous casting technology and continuous hot extrusion processing to obtain a copper magnesium alloy feedstock with the average particle size of 5-10 microns; and 2) carrying out continuous equal channel angular extrusion processing on the copper magnesium alloy feedstock obtained in the step 1) to finally obtain the copper magnesium alloy, wherein the extrusion temperature is 273-573K, an equal channel angle in a die is 90-120 degrees, the average particle size of the copper magnesium alloy is smaller than 500nm, the tensile strength is no less than 560MPa, the elongation is no less than 20 percent, the electrical conductivity is no less than 80 percent IACS, and the copper magnesium alloy can be used for a contact line material of a high-speed railway. With the adoption of the processing method, copper magnesium alloy crystal particles can be remarkably refined, the obdurability of the copper magnesium alloy is greatly improved, the processing process is also simple, and subsequent processing is not needed.

Description

technical field [0001] The invention relates to a processing method for a high-strength, toughness and high-conductivity copper-magnesium alloy, which belongs to the technical field of non-ferrous alloy processing. Background technique [0002] High-strength and high-conductivity copper alloy is a structural functional material with excellent comprehensive physical and mechanical properties, and is widely used in contact wire materials of electrified railways. As an important medium in the pantograph-catenary relationship of electrified railways, the contact wire is used to ensure that the train can continuously obtain electric energy from the traction power supply system when it is running at high speed. Large working tension), the mechanical properties and electrical conductivity of the contact wire will directly affect the safe and stable operation of the high-speed train. Aiming at the congenital deficiency of low strength of pure copper wire, people increase its mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C9/00C22C1/00C22F1/08
Inventor 江静华朱承程马爱斌宋丹陈建清杨东辉
Owner HOHAI UNIV
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