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A kind of high-strength high-conductivity copper-magnesium alloy and its preparation method

A high-conductivity, high-strength technology, applied in the field of high-strength and high-conductivity copper-magnesium alloys and their preparation, can solve the problems of high conductivity, low elongation, and difficulty in breaking through 70% of conductivity, and achieve high conductivity , High temperature softening ability strong effect

Active Publication Date: 2017-06-20
CENT SOUTH UNIV
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Problems solved by technology

Cu-Ag and Cu-Sn have good electrical conductivity, but their strength and high temperature softening resistance are relatively low; the Cu-Cr-Zr copper alloy contact wire alloy currently being developed in China is expected to meet the strength of more than 600MPa and the conductivity of more than 80% IACS high-end demand, but the production process of this precipitation-strengthened contact wire is complicated, and heat treatment must be carried out, so it is difficult to achieve large-scale production
Cu-Mg alloy is currently the most used on high-speed lines, with good tensile strength (500-550MPa), but the electrical conductivity is difficult to break through 70% IACS
[0003] CN104711449A discloses a microalloyed copper-magnesium alloy material, which is composed of 0.05-0.15% magnesium, 0.001-0.005% phosphorus, 0.005-0.1% CuY15 alloy and copper. The alloy is made by vacuum melting and has high conductivity. But its strength is less than 400MPa, and the elongation is very low
CN104711449A discloses a microalloyed copper-magnesium alloy material, which is composed of 0.05-0.15% magnesium, 0.001-0.005% phosphorus, 0.005-0.1% CuY15 alloy and copper. The alloy is made by vacuum melting and has high conductivity. But its strength is less than 400MPa, and the elongation is very low
The above alloys are all designed based on the deoxidation effect of P and the formation of the second phase, but it is difficult for all P elements to combine with Mg, which makes it difficult to improve the electrical conductivity of the alloy.
CN 102851526A discloses a high-conductivity copper-magnesium alloy contact wire and its processing technology. The copper-magnesium alloy contains 0.02wt% to 0.10wt% of magnesium, ≤0.01wt% of silver, and the balance is copper and unavoidable Impurities, through the addition of silver, the conductivity of the alloy exceeds 90%, but it also greatly reduces the strength of the alloy

Method used

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  • A kind of high-strength high-conductivity copper-magnesium alloy and its preparation method
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Experimental program
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Embodiment 1

[0034] The alloy composition is Mg: 0.2wt%; Ca: 0.1wt%; B: 0.005wt%; the balance is Cu and unavoidable impurities.

[0035] The specific process steps include:

[0036] (1) Melting to prepare CuMgCaB alloy melt

[0037] Electrolytic pure copper, pure magnesium, Cu-Ca master alloy and Cu-B master alloy are used as raw materials. After all raw materials are baked and dried, they are smelted in a non-vacuum induction melting furnace. The melting and feeding sequence is as follows:

[0038] Add electrolytic pure copper for charging → add calcined charcoal covering agent → heat up to 1200°C-1250°C → melt → control furnace temperature at 1100-1120°C, add pure magnesium → melt → control furnace temperature at 1020-1060°C, add Cu- B master alloy→melting→control furnace temperature at 1020-1060℃, add Cu-Ca master alloy→melt→add cryolite and calcium fluoride, stir to remove slag. CuMgCaB alloy melt is formed after melting;

[0039] (2) Semi-continuous casting

[0040] The CuMgCaB al...

Embodiment 2

[0053] The alloy composition is Mg: 0.2wt%; Ca: 0.3wt%; B: 0.005wt%; the balance is Cu and unavoidable impurities. According to the processing steps of steps (1)-(7) of Example 1, a plate with a thickness of 10mm is made. Wherein in step (2), the casting speed is 5m / h, and the cooling water pressure is 0.06MPa; in step (4), the cold drawing pass deformation is 20%, and the total deformation is 80%; in step (5), intermediate annealing The temperature is 700° C., and the time is 1 h; the cold finish drawing deformation in step (6) is 20%; the annealing temperature of the finished product in step (7) is 720° C., and the time is 1 h. The measured properties of the plate are as follows: tensile strength σ b =510MPa, electrical conductivity g=78.9% IACS, elongation δ=8.1%.

Embodiment 3

[0055] The alloy composition is Mg: 0.6wt%; Ca: 0.3wt%; B: 0.005wt%; the balance is Cu and unavoidable impurities. According to the processing steps of the steps (1)-(7) of Embodiment 1, a plate with a thickness of 10mm is made. Wherein the casting speed is 5m / h in the step (2), and the cooling water pressure is 0.06MPa; In the step (4), the deformation of the cold rolling pass is 20%, and the total deformation is 80%; the intermediate annealing temperature in the step (5) 700°C for 1 hour; in step (6), the cold finish rolling deformation is 20%; in step (7), the finished annealing temperature is 720°C, and the time is 1 hour. The measured properties of the plate are as follows: tensile strength σ b =544MPa, electrical conductivity g=75.2% IACS, elongation δ=7.7%.

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Abstract

The invention belongs to the technical field of novel metal materials and discloses a high-strength high-conductivity Cu-Mg alloy and a preparation method thereof. The purposes of high strength and high conductivity superior to those of traditional Cu-Mg alloys are achieved by adding Ca and a trace amount of B element. The alloy comprises the following chemical constituents: 0.2-0.8wt% of Mg; 0.05-0.5wt% of Ca; 0.005-0.01wt% of B; and Cu and inevitable impurities in balancing amount. The preparation process comprises (1) non-vacuum induction smelting, (2) casting, (3) surface milling, (4) cold working, (5) intermediate annealing, (6) cold finishing, (7) finished product annealing and the like. The alloy provided by the invention has reasonable constituents, a simple production technology and excellent castability and machinability. The alloy produced according to the invention has higher intensity, conductivity and high-temperature softening resistance than conventional Cu-Mg alloys, and can be applied in the fields of aerospace, high-speed rail transit, electronic information and the like.

Description

technical field [0001] The invention relates to a high-strength and high-conductivity copper-magnesium alloy and a preparation method thereof, belonging to the field of new nonferrous metal materials. Background technique [0002] In the field of metal materials, high-strength and high-conductivity copper alloy has been widely valued because of its excellent physical and mechanical properties. It is an important non-ferrous metal structural functional material and is widely used in contact wire materials of electrified railways. At present, the contact wire materials of electrified railway mainly include Cu-Mg, Cu-Sn, Cu-Ag, Cu-Cr-Zr and so on. Cu-Ag and Cu-Sn have good electrical conductivity, but their strength and high temperature softening resistance are relatively low; the Cu-Cr-Zr copper alloy contact wire alloy currently being developed in China is expected to meet the strength of more than 600MPa and the conductivity of more than 80% IACS However, the production pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C9/00C22C1/03C22F1/08
CPCC22C1/03C22C9/00C22F1/08
Inventor 李周肖柱李亚萍方梅龚深雷烨琛
Owner CENT SOUTH UNIV
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