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High-cost-performance high-strength high-conductivity Al-Sc-Zr-Yb alloy and heat treatment technique thereof

A cost-effective and high-strength technology, applied in the field of alloy materials, can solve existing problems, such as reduced electrical conductivity, and achieve the effects of reducing production costs, high cost performance, and improving economic benefits

Active Publication Date: 2017-05-31
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems in the application of Sc and Zr composite microalloying
Sc has the best aging strengthening effect at 300°C, but the Zr element with a low diffusion coefficient cannot be completely precipitated and the electrical conductivity is reduced
CN105483455A has achieved very good results, but in some practical applications, the hardness and conductivity need to be further improved, and at this time, CN105483455A can no longer meet the occasions that further require high performance

Method used

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  • High-cost-performance high-strength high-conductivity Al-Sc-Zr-Yb alloy and heat treatment technique thereof
  • High-cost-performance high-strength high-conductivity Al-Sc-Zr-Yb alloy and heat treatment technique thereof
  • High-cost-performance high-strength high-conductivity Al-Sc-Zr-Yb alloy and heat treatment technique thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Alloy ingots were prepared by graphite crucible smelting and iron mold casting, and the raw materials used were high-purity aluminum and master alloys of Al-2wt%Sc, Al-3wt%Zr, and Al-25wt%Yb. At a melting temperature of 780±10°C, first melt high-purity aluminum ingots, then add Al-Sc, Al-Zr, and Al-Yb master alloys, stir well, keep warm for 15 minutes, and then cast iron molds. The ingot is subjected to homogenization annealing at 640±10° C., and then subjected to cold rolling deformation with a deformation amount of 90%. Five aluminum alloys with different compositions were prepared, and their actual compositions were measured by XRF, as shown in Table 1 below.

[0029] Table 1 Experimental alloy composition

[0030]

Embodiment 2

[0031] Embodiment 2: The alloy in Embodiment 1 is subjected to solution treatment at 640±10° C. for 40 to 50 hours, water quenched to room temperature, and then subjected to isothermal aging at 350° C. figure 2 is the hardness curve of the alloy subjected to isothermal aging at 350°C. It can be seen from the figure that in the early stage of aging, the hardness value of the alloy increases continuously with the prolongation of the aging time, and reaches the hardness peak value after 1 hour of aging, and then the hardness value remains basically unchanged as the time prolongs. After aging for 96 hours, the hardness values ​​of A1 and A2 alloys are 66HV and 73HV respectively, which shows that the alloys have a good strengthening effect. Image 6is the electrical conductivity curve of the alloy aged isothermally at 350 °C. It can be seen from the figure that with the prolongation of the aging time, the electrical conductivity shows an overall upward trend. After 96 hours of agi...

Embodiment 3

[0032] Embodiment 3: The alloy in Embodiment 1 is subjected to solution treatment at 640±10° C. for 40 to 50 hours, water quenched to room temperature, and then subjected to isothermal aging at 400° C. image 3 , Figure 7 Respectively, the hardness curve and electrical conductivity curve of the alloy aged at 400 °C isothermally. It can be seen from the figure that the changing trends of the hardness curve and the electrical conductivity curve of the alloy are similar to the curves in Example 2. After aging for 96 hours, the hardness values ​​of A1 and A2 alloys are 66HV and 72HV respectively, and the electrical conductivity can reach 60.3%IACS and 60.4%IACS. It can be seen that A1 and A2 alloys have high strength and high conductivity. Although the electrical conductivity of A4 and A5 alloys exceeds 60.0%IACS after aging for 96 hours, their hardness values ​​are only 52HV and 48HV. After aging for 96 hours, the hardness value of A3 alloy is 68HV, and the electrical conducti...

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Abstract

The invention relates to a high-cost-performance high-strength high-conductivity Al-Sc-Zr-Yb alloy and a heat treatment technique thereof, belonging to the technical field of alloys. The alloy is prepared by adding 0.193-0.256 wt% of Sc, 0.187-0.243% wt% of Zr and 0.077-0.109 wt% of Yb into an aluminum matrix. The heat treatment technique of the alloy comprises the following steps: carrying out solution treatment at 640+ / -10 DEG C for 40-50 hours, carrying out water quenching to room temperature, and carrying out isothermal aging at 350-400 DEG C for 96-144 hours. By adopting Sc-Zr-Yb composite microalloying, the alloy has obvious aging strengthening effect and favorable electric conductivity; and under the condition of obtaining the same hardness value, the price of the Al-Sc-Zr-Yb alloy can be lowered by 30 yuan / kg as compared with the Al-Sc-Zr alloy, and thus, the Al-Sc-Zr-Yb alloy has high cost performance.

Description

technical field [0001] The invention belongs to the technical field of alloy materials, and in particular relates to a compound microalloyed aluminum alloy material and a heat treatment process thereof. [0002] technical background [0003] With the sustained and rapid development of my country's economy, the demand for electricity, an important energy source, continues to rise. As a wire material, aluminum and its alloys not only have excellent electrical and thermal conductivity, good processability, but also low price, so they are receiving more and more attention. [0004] In addition to having good electrical conductivity, the wire material should also have a certain strength to support its own quality and external natural loads (wind load, ice load, etc.). In the field of materials science, there are four ways to improve the strength of aluminum alloys: fine grain strengthening, deformation strengthening, solid solution strengthening and dispersion strengthening. Whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22F1/04
CPCC22C21/00C22F1/04
Inventor 高坤元杨倩丁宇升聂祚仁文胜平黄晖吴晓蓝
Owner BEIJING UNIV OF TECH
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