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Heat treatment method for improving high-temperature endurance performance of deformed aluminum-copper-magnesium-silver alloy

A heat treatment method and aluminum-copper-magnesium technology, applied in the field of metal material processing, can solve problems such as difficulty meeting performance requirements, failing to reflect high-temperature mechanical properties, failing to produce ideal effects, etc., to improve long-term high-temperature durability and excellent long-term performance High temperature durability, the effect of excellent high temperature durability

Inactive Publication Date: 2021-04-16
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the T8 state alloy cannot reflect the excellent high-temperature mechanical properties similar to the T6 state, and it is difficult to meet the performance requirements of long-term service. This is a difficult problem that must be overcome for the engineering application of this series of alloys.
At present, some research attempts to improve the high-temperature mechanical properties of Al-Cu-Mg-Ag alloys by increasing the amount of deformation or adding trace rare earth elements, but none of them have produced ideal results.

Method used

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  • Heat treatment method for improving high-temperature endurance performance of deformed aluminum-copper-magnesium-silver alloy
  • Heat treatment method for improving high-temperature endurance performance of deformed aluminum-copper-magnesium-silver alloy
  • Heat treatment method for improving high-temperature endurance performance of deformed aluminum-copper-magnesium-silver alloy

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Experimental program
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Effect test

Embodiment 1

[0027] The composition of alloy 1 is: 5.74% Cu, 0.44% Mg, 0.88% Ag, 0.30% Mn, 0.09% Zr, 0.03% Ti, 0.10% Fe, 0.06% Si, and the balance is aluminum. After the alloy was melted and casted, the ingot was homogenized, and the ingot was hot-rolled, the plate was quenched at 515°C for 6 hours, aged at 180°C for 25 minutes, and then stretched at 1.8%, 3.4% and 5%. Continue aging at 180°C for 4h to obtain corresponding alloy samples. The durable fracture times of the obtained alloy samples under the conditions of 200°C / 180MPa and 200°C / 200MPa are shown in Table 1.

Embodiment 2

[0033] The composition of alloy 2 is: 6.10% Cu, 0.33% Mg, 1.31% Ag, 0.29% Mn, 0.10% Zr, 0.03% Ti, 0.05% Fe, 0.03% Si, and the balance is aluminum. The alloy is melted and casted, the ingot is homogenized, and the ingot is hot-rolled. The plate is quenched at 525°C for 2h, aged at 190°C for 1h, and then subjected to 2.5% tensile deformation, and then aged at 180°C for 3h to obtain Corresponding alloy samples. Table 2 shows the durable fracture times of the obtained alloy samples under the conditions of 200°C / 160MPa, 200°C / 190MPa and 200°C / 220MPa.

Embodiment 3

[0041] The composition of alloy 3 is: 6.23% Cu, 0.62% Mg, 1.71% Ag, 0.27% Mn, 0.12% Zr, 0.05% Ti, 0.04% Fe, 0.03% Si, and the balance is aluminum. The alloy was melted and casted, the ingot was homogenized, and the ingot was hot-rolled. The plate was quenched at 515°C for 6 hours, aged at 200°C for 10 minutes, and then subjected to 2% tensile deformation, and then aged at 180°C for 3 hours to obtain Corresponding alloy samples. Table 3 shows the durable fracture times of the obtained alloy samples under the conditions of 200°C / 180MPa and 200°C / 200MPa.

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Abstract

The invention belongs to the technical field of metal material treatment, and particularly relates to a heat treatment method for improving the high-temperature endurance performance of a deformed aluminum-copper-magnesium-silver alloy. The heat treatment method comprises the steps that S1, the aluminum-copper-magnesium-silver alloy is subjected to solid solution and quenching treatment, and then artificial aging treatment is conducted for 0-1h; and S2, the aluminum-copper-magnesium-silver alloy material treated in the step S1 is subjected to tensile deformation treatment and then subjected to artificial aging treatment for 1-8h, and the deformed aluminum-copper-magnesium-silver alloy with excellent high-temperature endurance performance is obtained. According to the method, the stable formation of the heat-resistant omega phase or the precursor thereof is ensured through short-time artificial aging in advance, so that the heat-resistant omega phase or the precursor thereof can still exist stably after deformation treatment, the mass formation of the heat-resistant omega phase in the subsequent artificial aging process is promoted, and the excellent long-time high-temperature endurance property of the shape-variable alloy is ensured.

Description

technical field [0001] The invention belongs to the technical field of metal material treatment, and in particular relates to a heat treatment method for improving the high-temperature durability performance of a deformed aluminum-copper-magnesium-silver alloy. Background technique [0002] With the continuous development of the aerospace industry, the demand for high-performance heat-resistant aluminum alloy materials is increasing day by day. Under the action of heat and load, the structural parts of high-speed aircraft often require no destructive fracture after hundreds or even thousands of hours of service. However, traditional heat-resistant aluminum alloys, such as 2618 alloy, are difficult to meet the performance requirements of long-term service in high-temperature environments. [0003] Aluminum-copper-magnesium-silver alloy is a new type of heat-resistant aluminum alloy material. Its high-temperature mechanical properties are significantly better than the existing...

Claims

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Application Information

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IPC IPC(8): C22F1/057C22C21/16
Inventor 柏松刘志义
Owner CENT SOUTH UNIV
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