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Aluminum alloy material for manufacturing large cross section main load-carrying structure member and preparation thereof

An aluminum alloy material and large cross-section technology, applied in the field of aluminum alloy, can solve the problems of unreasonable chemical composition window and main element ratio, moderate heat treatment hardenability, and not suitable for the manufacture of large-scale aviation main load-bearing structural parts, etc. Achieve the effect of superior heat treatment hardenability and superior fracture toughness

Inactive Publication Date: 2009-04-15
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these alloys have the problem of moderate or even poor heat treatment hardenability, and their hardened thickness generally does not exceed 150mm, which is not suitable for the manufacture of large-scale aerospace main load-bearing structural parts, which limits the further application of this series of alloys in the aviation field
The main reason for the above problems is that the chemical composition window and the ratio of the main elements of the above alloys are not reasonable.

Method used

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  • Aluminum alloy material for manufacturing large cross section main load-carrying structure member and preparation thereof
  • Aluminum alloy material for manufacturing large cross section main load-carrying structure member and preparation thereof
  • Aluminum alloy material for manufacturing large cross section main load-carrying structure member and preparation thereof

Examples

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Effect test

Embodiment 1

[0039] The Al-7.4Zn-1.7Mg-1.4Cu-0.2Zr (wt%) alloy is prepared by the method of ingot metallurgy. The raw materials used are high-purity aluminum, industrial pure magnesium, industrial pure zinc, aluminum-copper master alloy, and magnesium-zirconium master alloy. The melting furnace is a resistance heating furnace, and the casting machine is a vertical semi-continuous casting machine. The melting and casting process used is: furnace loading (loading high-purity aluminum into the furnace first) → melting (adding industrial pure zinc, aluminum-copper master alloy, and magnesium-zirconium master alloy for melting) → slagging → processing industrial pure magnesium → stirring → sampling Perform composition analysis → adjust composition → stirring → refining (730°C) → slag removal → stand still (10 minutes) → casting. The casting temperature is 700°C and the casting speed is 60mm / min. The ingot is subjected to homogenization heat treatment at 470°C / 24h, the ingot is peeled, and the tempe...

Embodiment 2

[0047] The Al-8.0Zn-1.7Mg-1.4Cu-0.22Zr (wt%) alloy is prepared by ingot metallurgy. The raw materials used are high-purity aluminum, industrial pure magnesium, industrial pure zinc, aluminum-copper master alloy, and magnesium-zirconium master alloy. The melting furnace is a resistance heating furnace, and the casting machine is a vertical semi-continuous casting machine. The melting and casting process used is: furnace loading (loading high-purity aluminum into the furnace first) → melting (adding industrial pure zinc, aluminum-copper master alloy, and magnesium-zirconium master alloy for melting) → slagging → processing industrial pure magnesium → stirring → sampling Perform composition analysis → adjust composition → stir → refining (725°C) → slag removal → stand still (10 minutes) → casting, the casting temperature is 695°C, and the casting speed is 50mm / min. The ingot is subjected to homogenization heat treatment at 465°C / 32h, the ingot is peeled, and the heat is kept at 390°C...

Embodiment 3

[0049] The Al-7.8Zn-1.4Mg-1.6Cu-0.3Zr (wt%) alloy is prepared by ingot metallurgy. The raw materials used are high-purity aluminum, industrial pure magnesium, industrial pure zinc, aluminum-copper master alloy, and magnesium-zirconium master alloy. The melting furnace is a resistance heating furnace, and the casting machine is a vertical semi-continuous casting machine. The melting and casting process used is: furnace loading (loading high-purity aluminum into the furnace first) → melting (adding industrial pure zinc, aluminum-copper master alloy, and magnesium-zirconium master alloy for melting) → slagging → processing industrial pure magnesium → stirring → sampling Perform composition analysis → adjust composition → stirring → refining (725°C) → slag removal → standing (10 minutes) → casting, the casting temperature is 710°C, and the casting speed is 50mm / min. The ingot is subjected to homogenization heat treatment at 470°C / 24h, the ingot is peeled, and the heat is kept at 400°C...

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Abstract

The invention discloses an aluminum alloy material suitable for manufacturing large-section products and a preparation method thereof. Accounted in weight percentage, the alloy components are as follows: 7.4 to 8.4wt percent of Zn, 1.4 to 2.2wt percent of Mg, 1.1 to 1.7 percent of Cu, 0.18 to 0.3 percent of Zr and Al as the rest. The aluminum alloy material has higher intensity, excellent toughness and excellent corrosion resistance performance (conductance rate); the most important point is that the aluminum alloy material has extremely excellent heat treatment harden ability performance, and is particularly suitable for manufacturing the large-section products. The material can be applied to the key large type main bearing structure parts in the fields of aerospace, transportation, war industry, and the like.

Description

Technical field [0001] The invention relates to an aluminum alloy, especially an aluminum alloy material suitable for manufacturing large cross-section products and a preparation method thereof. Background technique [0002] As the most typical lightweight material among metal materials, aluminum alloy has the advantages of low specific gravity, easy processing, and low cost. It has always been a key dual-use material for both military and civilian use. [0003] 7xxx series aluminum alloy is the general name of Al-Zn-Mg-Cu series aluminum alloy, and it is also the strongest type of various deformed aluminum alloys that have been successfully commercialized. 7000 series aluminum alloy pre-stretched plates are different This is a key intermediate product used in the manufacture of large-scale monolithic structural parts used in civil and military aircraft, ground and maritime transportation vehicles. With the continuous improvement of the overall performance requirements of large-s...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/03C22F1/053
CPCC22C21/10C22C1/03C22F1/053
Inventor 熊柏青张永安李志辉朱宝宏王锋刘红伟李锡武
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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