Al-Er-Cu high-strength high-electric conductivity aluminium alloy and thermomechanical treatment technology thereof

An al-er-cu, high-conductivity technology, applied in the field of metal alloys, can solve the problems of the greater influence of the conductivity of aluminum alloys and the low conductivity of alloys, and achieve the effect of improving strength and high conductivity

Inactive Publication Date: 2015-09-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zr element has a great influence on the conductivity of aluminum alloy, and the conductivity of Al-Er-Zr alloy is low (55%~59%IACS)

Method used

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  • Al-Er-Cu high-strength high-electric conductivity aluminium alloy and thermomechanical treatment technology thereof
  • Al-Er-Cu high-strength high-electric conductivity aluminium alloy and thermomechanical treatment technology thereof
  • Al-Er-Cu high-strength high-electric conductivity aluminium alloy and thermomechanical treatment technology thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1: An alloy ingot was prepared by smelting in a graphite crucible and casting in an iron mold, and the raw materials used were high-purity aluminum and an intermediate alloy of Al-6% Er and Al-50% Cu. At a smelting temperature of 770±10°C, first melt the aluminum ingot, then add Al-6% Er, Al-50% Cu master alloy, after the master alloy is melted, fully stir, keep it warm for 10 minutes, and make the melt Iron mold casting is carried out after the components of each element are evenly distributed. Al-Cu alloys and three Al-Er-Cu alloys with different compositions were prepared, as shown in Table 1 below.

[0021] Table 1 Experimental alloy composition

[0022] sample

example 2

[0023] Example 2: The S1 alloy in Example 1 was solid-dissolved at 500±10°C for 24 hours, water quenched to room temperature, and subjected to isochronous annealing at 100-475°C, and samples were taken every 25°C. S2, S3, and S4 alloys were solid-dissolved at 640±10°C for 24 hours, water-quenched to room temperature, and annealed at 100-475°C, and the same was taken every 25°C. figure 1 The Vickers hardness of the alloy at different temperatures is given. It can be seen from the figure that the hardness value of the S1 alloy is about 28HV, basically unchanged. The S2 alloy reaches the hardness peak of 39.9HV at 300°C, and the S3 alloy reaches the hardness peak value of 41.7 at 275°C. HV, S4 alloy reaches the peak hardness of 46.5HV at 250℃. It shows that the addition of Er element to Al-Cu has a time-aging strengthening effect, and with the increase of Cu element content, the hardness peak value also increases continuously, and at the same time the temperature at the peak poi...

example 3

[0024] Example 3: Perform solution treatment (500±10°C / 24h) on the S1 alloy in Example 1, perform peak aging treatment after solution treatment (640±10°C / 24h) on S2, S3, and S4 alloys, and peak aging of S2 alloy The heat treatment process is 100-300°C every 25°C isochronous annealing for 3 hours, the S3 alloy peak aging heat treatment process is 100-275°C every 25°C isochronous annealing for 3 hours, the S4 alloy peak aging heat treatment process is 100-250°C every Anneal at intervals of 25°C for 3 hours. Then the solid solution state of the S1 alloy, the solid solution state and the peak aging state of the S2, S3, and S4 alloys are cold-rolled respectively, and the cold rolling deformation is about 90%. Then measure its hardness value and conductivity. The obtained data are shown in Table 2. It can be seen from the table that with the increase of Cu content, the hardness value after cold rolling deformation gradually increases, while the electrical conductivity gradually de...

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Abstract

An Al-Er-Cu high-strength high-electric conductivity aluminium alloy and a thermomechanical treatment technology thereof belong to the technical field of alloy. The alloy is formed by adding 0.22-0.27% of Er and 0.55-1.09% of Cu into an aluminium matrix. Al-Er-Cu alloy is smelted under the temperature of 770+/-10 DEG C, is fully stirred and then is cast to obtain as-cast alloy. The solid solution aging thermal treatment technology comprises the following steps: the alloy is firstly subjected to solution treatment for 24 hours under 640+/-10 DEG C, and is subjected to water quenching to a room temperature; and then the alloy is subjected to isochronal aging for 3 hours at intervals of 25 DEG C between 100 DEG C and 475 DEG C. The thermomechanical treatment technology comprises the following steps: after the alloy subjected to solution treatment is cold-rolled, the alloy is subjected to isochronal aging for 3 hours at intervals of 25 DEG C between 100 DEG C and 475 DEG C, or after the alloy is subjected to solution treatment and cold rolling as well as peak aging and cold rolling, the alloy is subjected to isothermal annealing under the temperature of 200 DEG C. According to the invention, the solution strengthening, the precipitated phase strengthening and the work hardening of Cu are adopted, and a mass of nanoscale strengthening phase particles are precipitated in the annealing process, so that the alloy is strengthened in the annealing process, and the electric conductivity of the alloy is further improved.

Description

technical field [0001] The invention relates to an aluminum alloy material undergoing microalloying, solid solution strengthening, precipitation strengthening and deformation strengthening and a deformation heat treatment process thereof, belonging to the technical field of metal alloys. technical background [0002] At present, the wires used in my country's overhead transmission lines are basically still traditional steel-cored aluminum stranded wires. The disadvantages are low conductivity and large power loss during long-span and long-distance transmission. The medium-strength all-aluminum alloy wire has a high conductivity (58.5%-59%IACS), and its strength is only 250MPa, while the high-strength all-aluminum alloy has a strength of 295MPa, but its conductivity is low (53%IACS). At present, there is no all-aluminum alloy wire with high strength and high conductivity at the same time. There is a contradiction between the strength of the alloy and the increase in electric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/12C22C1/03C22F1/057
Inventor 聂祚仁李健飞文胜平王为高坤元黄晖吴晓蓝
Owner BEIJING UNIV OF TECH
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