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600 MPa level low-quenching-sensitivity ultrahigh strength aluminum alloy and preparing method thereof

A quenching-sensitive and ultra-high-strength technology, applied in the field of 600MPa-level low-quenching-sensitivity ultra-high-strength aluminum alloy and its preparation, can solve the problems of reducing the safety factor of aircraft and low strength of aluminum alloy, and achieve the goal of inhibiting the growth of grains, The effect of improving the microstructure and improving the comprehensive properties of the alloy

Inactive Publication Date: 2017-10-13
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to reduce the quenching sensitivity of AA7085, the strengthening phase MgZn is reduced 2 The relative quantity leads to relatively low strength of AA7085 aluminum alloy, thus reducing the safety factor of the aircraft

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Ratio: The new low quenching sensitivity ultra-high strength aluminum alloy of this embodiment is 8.0wt% Zn, 1.75wt% Mg, 1.22wt% Cu, 0.12wt% Zr, Mn content <0.05wt%, Cr The content of Ti<0.05wt%, the content of Ti<0.05wt%, the total content of Mn, Cr and Ti<0.15wt%, the content of Fe<0.15wt%, the content of Si<0.10wt%, the balance is Al, proportioning raw materials.

[0027] Smelting and refining: Smelting the raw materials with a good ratio in a smelting furnace, the melting temperature is 710°C; refining the completely melted metal, the metal temperature is maintained at 690°C during refining, and it should be fully allowed to stand after refining. The time is 30 minutes.

[0028] Casting: start casting after the above molten metal has been allowed to stand sufficiently, the furnace mouth temperature is 680°C, and a 240mm×80mm×10mm square ingot is cast.

[0029] Homogenization treatment: carry out three-stage homogenization treatment on the above-mentioned square in...

Embodiment 2

[0035] Ratio: The new low quenching sensitivity ultra-high strength aluminum alloy of this embodiment is 7.8wt% Zn, 1.82wt% Mg, 1.20wt% Cu, 0.12wt% Zr, Mn content <0.05wt%, Cr The content of Ti<0.05wt%, the content of Ti<0.05wt%, the total content of Mn, Cr and Ti<0.15wt%, the content of Fe<0.15wt%, the content of Si<0.10wt%, the balance is Al, proportioning raw materials.

[0036] Smelting and refining: Smelting the raw materials with a good ratio in a smelting furnace at a melting temperature of 760°C; refining the completely melted metal, maintaining the metal temperature at 730°C during refining, and fully standing after refining. The time is 30 minutes.

[0037] Casting: start casting after the above molten metal has been allowed to stand sufficiently, the furnace mouth temperature is about 720°C, and a 240mm×80mm×10mm square ingot is cast.

[0038] Homogenization treatment: carry out three-stage homogenization treatment on the above square ingot, the first stage is hea...

Embodiment 3

[0044] Ratio: The new low quenching sensitivity ultra-high strength aluminum alloy of this embodiment is 8.0wt% Zn, 1.75wt% Mg, 1.22wt% Cu, 0.12wt% Zr, Mn content <0.05wt%, Cr The content of Ti<0.05wt%, the content of Ti<0.05wt%, the total content of Mn, Cr and Ti<0.15wt%, the content of Fe<0.15wt%, the content of Si<0.10wt%, the balance is Al, proportioning raw materials.

[0045] Smelting and refining: Smelting the raw materials with a good ratio in a smelting furnace, the melting temperature is 710°C; refining the completely melted metal, the metal temperature is maintained at 690°C during refining, and it should be fully allowed to stand after refining. The time is 30 minutes.

[0046] Casting: start casting after the above molten metal has been allowed to stand sufficiently, the furnace mouth temperature is 680°C, and a 240mm×80mm×10mm square ingot is cast.

[0047] Homogenization treatment: carry out three-stage homogenization treatment on the above-mentioned square in...

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Abstract

The invention discloses a 600 MPa level low-quenching-sensitivity ultrahigh strength aluminum alloy and a preparing method thereof. The content and weight percent of Zn, Mg, Cu, Zr, Mn, Cr and Ti in the aluminum alloy are adjusted, and the three-level homogenizing treatment technology and the peak value aging or double-level aging treatment technology is adopted in the preparing technology. By adoption of the novel aluminum alloy prepared through the method, the comprehensive performance of the novel aluminum alloy is superior to AA7085.

Description

Technical field: [0001] The invention relates to the field of non-ferrous metal materials, in particular to a 600MPa-level low-quenching-sensitive ultra-high-strength aluminum alloy and a preparation method thereof. Background technique: [0002] With the development of the aerospace industry, the integrity and reliability of the key structural components of the aerospace industry will be improved, and the weight of the aviation industry will be further reduced. The plate puts forward urgent requirements, that is, it is required that the new ultra-high-strength aluminum alloy material should not only have ultra-high strength, but also have low quenching sensitivity and good fatigue performance and other comprehensive properties. [0003] At present, there are AA7075, AA7X50, AA7085 and other aluminum alloy grades for ultra-high-strength aluminum alloys used in foreign aviation thick plates. Among them, AA7085 aluminum alloy has the advantages of low quenching sensitivity and...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/02C22F1/053B21C37/02
CPCC22C21/10B21C37/02C22C1/026C22F1/053
Inventor 聂宝华陈东初罗铭强陈文泗聂德键孙海波
Owner FOSHAN UNIVERSITY
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