Ge-containing low-quenching sensitive aluminum alloy

A quenching sensitivity, aluminum alloy technology, applied in the field of low quenching sensitivity aluminum alloys, can solve the problems of uneven surface and core properties, difficult to obtain cooling rate, reduce cooling rate, etc., to improve the solid solution of solute atoms in the alloy Saturation, good core structure and mechanical properties, the effect of reducing quenching sensitivity

Inactive Publication Date: 2010-09-08
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The degree of supersaturation of the solid solution obtained after the alloy is quenched has a decisive effect on the aging strengthening effect, so it causes the quenching sensitivity of the alloy [1-3] , 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
Especia

Method used

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  • Ge-containing low-quenching sensitive aluminum alloy
  • Ge-containing low-quenching sensitive aluminum alloy
  • Ge-containing low-quenching sensitive aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The alloy composition is 6.0% Zn, 1.1% Mg, 1.6% Cu, 0.13% Zr, 0.08% Ti, 0.5% Ge, the balance is Al, the purity of the Ge is greater than or equal to 99.99%, and it is smelted into an ingot. After homogenization treatment at 450°C / 24h+455°C / 24h, it is hot-rolled into a 4mm thick round bar plate with an extrusion ratio of 25. After the sample was solidified at 470°C / 1h, the nose time of the tested TTP curve was delayed by 25 seconds compared with that of the alloy without Ge, reaching 30 seconds. Although the strength of the Ge-added alloy sample aged after quenching in room temperature water is lower than that of the alloy without Ge, but when quenched in air, the tensile strength of the Ge-added alloy sample is 10Mpa higher than that of the Ge-free alloy, and the yield strength is 60Mpa higher. .

[0035] Energy spectrum analysis shows that after holding at the tip temperature (275°C) for 30 seconds, the precipitated phase of Ge-added alloy is only Mg-Ge compound, whil...

Embodiment 2

[0037] The alloy composition is 6.5% Zn, 1.4% Mg, 1.3% Cu, 0.13% Zr, 0.08% Ti, 0.1% Ge, the balance is Al, the purity of the Ge is greater than or equal to 99.99%, and it is smelted into an ingot. After homogenization treatment at 450°C / 24h+455°C / 24h, it is hot-rolled into a plate with a thickness of 4mm, and the extrusion ratio is 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 tests show that although the strength of Ge-added alloy samples aged after quenching in room temperature water is lower than that of un-added Ge alloys, the tensile strength of Ge-added alloy samples is higher than that of non-Ge-added alloys when quenched in air 10Mpa, yield strength increased by 99Mpa.

Embodiment 3

[0039] The alloy composition is 7.0% Zn, 1.4% Mg, 1.6% Cu, 0.13% Zr, 0.08% Ti, 0.05% Ge, the balance is Al, the purity of the Ge is greater than or equal to 99.99%, and it is smelted into an ingot. After homogenization treatment at 450°C / 24h+455°C / 24h, it is hot-rolled into a plate with a thickness of 4mm. 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 tests show that although the strength of Ge-added alloy samples aged after quenching in room temperature water is lower than that of the alloy without Ge, when quenched in air, the tensile strength of Ge-added alloy samples is higher than that of the alloy without Ge Increased by 14Mpa, the yield strength increased by 60Mpa. EDS analysis was performed on the precipitated phases of the aluminum alloy treated in this example, and the results are shown in Table 1. The results showed that the precipitated phases were Mg-rich and Ge-rich phas...

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Abstract

The invention relates to a Ge-containing low-quenching sensitive aluminum alloy. Aluminum alloy is subjected to micro-Ge alloying treatment; based on the characteristic that binding energy of Ge element and vacancy is far more than that of elements of Zn, Mg, Cu and the like and the vacancy is utilized, the Ge element, when solid solution is quenched, is added into the inside of the alloy and is preferentially combined with the vacancy to prevent the diffusion of Zn, Mg, Cu and other solute atoms of the alloy at a low solid solution quenching speed and the precipitation of a coarse second phase; and therefore, the full hardening of the aluminum alloy is improved effectively, the quenching sensitivity of the aluminum alloy is reduced, and a quenching tissue with full solid solution is provided for obtaining dispersion-strengthened phase in subsequent aging. The Ge-containing low-quenching sensitive aluminum alloy can effectively reduce the quenching sensitivity of the aluminum alloy and improves the full hardening of the aluminum alloy, the saturation of the solute atom solid solution of the alloy at the low quenching speed and the mechanical property after the aging treatment. The Ge-containing low-quenching sensitive aluminum alloy provides a reliable aluminum alloy structural material for meeting the needs for large-scale heavy 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 containing 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 degree of supersaturation of the solid solution obtained after the alloy is quenched has a decisive effect on the aging strengthening effect, so it causes the quenching sensitivity of the alloy [1-3] , that is, the decrease in the quenching rate leads to a decrease in the mechanical properties of ...

Claims

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Application Information

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IPC IPC(8): C22C21/10
Inventor 刘志义林亮华吕青
Owner CENT SOUTH UNIV
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