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Low quenching sensitive aluminum alloy added with Ag and Ge at same time

A technology of quenching sensitivity and aluminum alloy, which is applied in the field of low quenching sensitivity aluminum alloy and low quenching sensitivity aluminum alloy adding Ag and Ge at the same time, which can solve the problems of reducing cooling rate, difficulty in obtaining cooling rate, reducing quenching stress, etc. , to achieve the effects of reducing quenching sensitivity, delaying nose tip time, and high tensile strength

Inactive Publication Date: 2010-09-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degree of supersaturation of the solid solution obtained after the alloy is quenched has a decisive effect on the effect of aging strengthening, so it causes the problem of quenching sensitivity of the alloy, that is, the decrease of the quenching rate leads to the decrease of the mechanical properties of the alloy
This problem is particularly prominent for large-scale components, because the core is difficult to obtain sufficient cooling rate under conventional cooling conditions
Especially for some large components, in order to reduce the quenching stress, quenching media such as boiling water and air are often used to reduce the cooling rate
In this way, for large-scale thick plates and large components of conventional aluminum alloys, it is more difficult to obtain good core structure and mechanical properties, resulting in uneven performance of the surface and core of large-scale aluminum alloy thick plates and large components, and overall performance drop

Method used

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  • Low quenching sensitive aluminum alloy added with Ag and Ge at same time
  • Low quenching sensitive aluminum alloy added with Ag and Ge at same time
  • Low quenching sensitive aluminum alloy added with Ag and Ge at same time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The alloy composition is 6.0% Zn, 1.1% Mg, 1.6% Cu, 0.13% Zr, 0.08% Ti, 0.5% Ge, 0.5% Ag, and the balance is Al. The purity of Ge and Ag is greater than or equal to 99.99%, and it is smelted into an ingot Blank. After homogenization treatment at 450°C / 24h+455°C / 24h, hot rolling into a 4mm thick plate. After the sample was solidified at 470℃ / 1h, compared with the alloy without Ge and Ag, the alloy with 0.5% Ge and 0.5% Ag was added, not only the incubation period of the second phase precipitation was prolonged, but the nose tip time of the TTP curve was delayed by 2 seconds, and the tensile strength and yield strength were increased by 4MPa and 27MPa.

Embodiment 2

[0034] The alloy composition is 6.5% Zn, 1.3% Mg, 1.3% Cu, 0.13% Zr, 0.08% Ti, 0.1% Ge, 0.1% Ag, and the balance is Al. The purity of Ge and Ag is greater than or equal to 99.99%, and it is smelted into an ingot Blank. After homogenization treatment at 450°C / 24h+455°C / 24h, it is hot-extruded into a Φ12.5mm round bar with an extrusion ratio of 25. After the sample was solidified at 470°C / 1h, it was quenched in water and air at room temperature, and aged at 120°C / 24h. Tensile property test shows that compared with the alloy without Ag and Ge, after quenching and aging in water at room temperature, the tensile strength and yield strength of the alloy samples added with 0.1% Ge and 0.1% Ag are both higher by 10Mpa. After quenching and aging in air, the tensile strength of the alloy sample added with 0.1% Ag and 0.1% Ge is 11Mpa higher, and the yield strength is 37MPa higher.

Embodiment 3

[0036] The alloy composition is 7.0% Zn, 1.4% Mg, 1.6% Cu, 0.13% Zr, 0.08% Ti, 0.05% Ge, 0.05% Ag, and the balance is Al. The purity of Ge and Ag is greater than or equal to 99.99%, and it is smelted into an ingot Blank. After homogenization treatment at 450°C / 24h+455°C / 24h, it is hot-extruded into a Φ12.5mm round bar with an extrusion ratio of 25. After the sample was solidified at 470°C / 1h, it was quenched in water and air at room temperature, and aged at 120°C / 24h. Tensile performance test shows that compared with the alloy without Ag and Ge, after quenching and aging in water at room temperature, the tensile strength and yield strength of the alloy sample added with 0.05% Ag and 0.05% Ge are both higher by 13Mpa. After quenching and aging in air, the tensile strength of the alloy sample added with 0.05% Ag and 0.05% Ge is higher by 18Mpa, and the yield strength is higher by 60MPa.

[0037] The performance parameters of the aluminum alloys obtained in Examples 1, 2, and 3...

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Abstract

The invention discloses a low quenching sensitive aluminum alloy added with Ag and Ge at the same time. The aluminum alloy is subjected to alloying treatment of trace Ag and Ge elements. On the one hand, the Ag and a vacancy have higher binding energy by using the characteristic that the binding energy of the Ge element and the vacancy is far greater than that of elements such as Zn, Mg, Cu and the like and the vacancy, and the Ge and Ag elements added into the alloy are first bond with the vacancy during solid solution quenching so as to prevent the dispersion of solvent atoms of Zn, Mg, Cu and the like in the alloy and the separation of a thick second phase at a low solid solution quenching speed, effectively improve the quenching property of the aluminum alloy, reduce the quenching sensitivity of the aluminum alloy and provide a complete solid solution quenching tissue for obtaining a dispersed strengthening phase for follow-up ageing; and on the other hand, the added Ag can play a role in reinforcement when the Ge is added by using the effect that the Ag can produce solid solution reinforcement and separation promotion in the aluminum alloy. A low quenching sensitive aluminum alloy structural material is provided for large-scale thick plates and large members in aerospace and other fields.

Description

technical field [0001] The invention discloses a low-quenching-sensitivity aluminum alloy, in particular to a low-quenching-sensitivity aluminum alloy simultaneously added with Ag and Ge; it belongs to the technical field of nonferrous metal alloying. Background technique [0002] High-strength Al-Zn-Mg-Cu alloy has the advantages of low density, high specific strength, hardness, good hot workability, corrosion resistance and fracture toughness. It is widely used in the aerospace field and is an important structural material in this field. one. This series of alloys is an aging-strengthenable alloy, and its high strength and hardness are mainly obtained through solid solution, quenching and aging. The supersaturation degree of the solid solution obtained after quenching of the alloy has a decisive effect on the aging strengthening effect, so it causes the quenching sensitivity of the alloy, that is, the decrease of the quenching rate leads to the decrease of the mechanical ...

Claims

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Application Information

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IPC IPC(8): C22C21/10
Inventor 刘志义李尧韩向南
Owner CENT SOUTH UNIV
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