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High-fire resistance A1-Cu-Mg-Ag alloy

A high heat-resistant, al-cu-mg-ag technology, applied in the field of Al-Cu-Mg-Ag alloys, can solve the problem of decreased thermal stability of alloys, decreased nucleation sites of Ω phases, decreased overall quantity and density of Ω phases, etc. problems, to achieve the effect of good high-temperature durable performance and excellent high-temperature short-term tensile performance

Inactive Publication Date: 2008-08-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Ag content of the existing Al-Cu-Mg-Ag alloys is mostly 0.5%wt. Long-term persistence or creep at temperatures above 200°C will gradually aggregate and coarsen the heat-resistant phase-Ω phase, thereby making the alloy’s Decreased thermal stability
The reason may be that the Ag / Mg atomic ratio is improperly matched, so that the Ag-Mg atomic clusters in the alloy matrix are gradually broken up due to atomic diffusion at high temperature, which reduces the nucleation sites of the Ω phase, and the original The Ω phase gradually coarsens, so the overall amount and density of the Ω phase in the alloy decreases

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0016] Proportion each alloy element according to Table 1, prepare 1# and 2# alloy ingots by smelting and casting, hot-roll into thin plates, solid solution at 515°C for 6 hours and water quenching, then aging at 165°C for 2 hours, oil bath slow cooling. The two alloys were held at 150°C, 200°C, 250°C and 275°C for 15 minutes, respectively, and then stretched at high temperature for a short time. After stretching at 150°C, the tensile strength of 1# alloy is 390MPa, and the tensile strength of 2# alloy is 325MPa. The tensile strength, yield strength and elongation of the two alloys after being stretched at 200°C, 200°C, 250°C and 275°C are as attached figure 1 shown. The data show that under the same heat treatment conditions, the short-term tensile properties of high-Ag alloys are better than those of low-Ag alloys. During the stretching process, the degree of aggregation and coarsening of the Ω-reinforced phase is not obvious, so it still has high tensile strength and yie...

Embodiment 2

[0018] Proportion the alloy elements according to Table 1, prepare 1# and 2# alloy ingots by smelting and casting method, hot-roll into thin plates, solid solution at 515°C for 6 hours and water quenching, and then aging at 165°C for 2 hours. After the treatment, the two alloys were subjected to high-temperature endurance tests at 200° C. respectively. The experimental results are: 1# alloy at 200°C, the endurance strength limit of 100 hours is 240Mpa, that is σ 100 200 = 240 Mpa ; 2# alloy is at 200℃, and the endurance strength limit of 100 hours is 220Mpa, that is σ 100 200 = 220 Mpa . The data show that: under the same heat treatment conditions, the high-temperature durability of high-Ag alloys is better than that of low-Ag alloys.

Embodiment 3

[0020] Proportion the alloy elements according to Table 1, prepare 1# and 2# alloy ingots by smelting and casting method, hot-roll into thin plates, solid solution at 515°C for 6 hours and water quenching, and then aging at 165°C for 2 hours. The two alloys after this treatment were subjected to heat exposure experiments at 200° C., and the heat exposure time was 10 hours, 20 hours, 50 hours, 80 hours and 100 hours. After the thermal exposure, the samples were mechanically stretched at room temperature. The experimental results are: the tensile strength of 1# alloy after 10 hours, 20 hours, 50 hours, 80 hours and 100 hours of heat exposure is 469.16MPa, 453.16MPa, 449.08MPa, 431.22MPa and 425.24MPa, and the yield strength is sequentially 450.37MPa, 442.44MPa, 435.06MPa, 410.55MPa and 391.25MPa, the elongation is 5.92%, 6.04%, 5.96%, 6.54% and 6.32%; 2# alloy after 10 hours, 20 hours, 50 hours, 80 hours and After 100 hours of heat exposure, the tensile strength is 432.89MPa, 4...

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Abstract

The invention discloses an Al-Cu-Mg-Ag alloy with high heat resistance, the components of which by weight percentage are: 4.6-6.6 percent of Cu, 0.4-0.65 percent of Mg, 1-1.5 percent of Ag, 0-0.06 percent of Fe, 0-0.06 percent of Si, 0.25-0.35 percent of Mn, 0.1-0.2 percent of Zr and the rest is Al. In the invention, the content of Ag in the Al-Cu-Mg-Ag alloy is increased and the atomic ratio of the Ag / Mg is properly increased, which results in that the alloy matrix has more Ohm phase nucleation sites and the Al-Cu-Mg-Ag alloy has more Ohm phases under high temperature, the alloy matrix obtains large amount of dispersed and fine strengthening phases to ensure that the Al-Cu-Mg-Ag alloy has excellent high-temperature short-time tensile property, high temperature stress rupture property, and good structure property and stability after long term thermal exposure; furthermore, the room temperature mechanical properties of the Al-Cu-Mg-Ag alloy of the invention is also superior to that of the existing Al-Cu-Mg-Ag alloy.

Description

technical field [0001] The invention relates to an Al-Cu-Mg-Ag alloy, in particular to an Al-Cu-Mg-Ag alloy with high heat resistance. Background technique [0002] In recent years, the Al-Cu-Mg-Ag alloy with high Cu / Mg ratio has been studied at home and abroad, and it is found that the alloy has good thermal stability, corrosion resistance, fracture toughness, damage resistance and forming processability. It is the most promising new type of heat-resistant and damage-resistant aluminum alloy for aircraft skin materials. Under certain alloy element content and heat treatment process conditions, a new type of strengthening phase-Ω phase can be precipitated in Al-Cu-Mg-Ag heat-resistant alloy, and this heat-resistant phase can exist stably at 200 °C for a long time without coarsening. The melting and aggregation growth make it possible for the alloy to serve for a long time at 200°C or even above 200°C. In the Al-Cu-Mg ternary alloy, Mg and Cu form Mg-Cu atomic clusters, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/16
Inventor 刘志义马飞跃夏卿坤李云涛周杰刘延斌
Owner CENT SOUTH UNIV
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