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High Zn content, superstrength and supertoughness, high destroy limit type aluminium alloy material and preparation method

A technology of aluminum alloy material and damage tolerance, applied in the field of aluminum alloy, can solve the problem of not forming a patent, and achieve the effect of high plasticity and damage tolerance performance

Active Publication Date: 2008-09-03
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, at present, industrially developed countries still adopt the form of KnowHow to protect the complete set of technologies for preparing ultra-high-strength 7000-series aluminum alloy materials by spray forming, and no patent has been formed so far.

Method used

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  • High Zn content, superstrength and supertoughness, high destroy limit type aluminium alloy material and preparation method
  • High Zn content, superstrength and supertoughness, high destroy limit type aluminium alloy material and preparation method
  • High Zn content, superstrength and supertoughness, high destroy limit type aluminium alloy material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The alloy composition is Zn 10wt%, Mg 2.5wt%, Cu 1.7%, Zr 0.5%, Fe figure 2 As shown, turn on the rotating motor 24 and the lifting motor 28, and rotate the receiving tray at a high speed at a speed of 60 to 120 rpm. The angle at which the receiving tray is pulled down is 35 degrees to the vertical line of the horizontal plane, and the speed of the pull-down is 20-30mm / min. A receiving tray 27, so that the atomized liquid droplets are directly deposited on the receiving tray 27. Continuously atomize 150 kg of new alloy at one time, and prepare a new type of high-strength and high-toughness aluminum alloy round ingot weighing 100Kg. The photo of the prepared round ingot is as follows Figure 4 shown. Process the deposited billet into a billet of a certain specification, keep it warm at 410°C for 2 hours, and perform hot extrusion processing with an extrusion ratio of 24:1 to extrude a φ30mm round bar, 440°C / 1h+480°C / 1.5 h solid solution treatment, the aging system adopt...

Embodiment 2

[0051] Zn 9wt%, Mg 2.0wt%, Cu1.3%, Zr 0.2%, FeIC (MPa*m 1 / 2 )=34, da / dN≤6×10 -3 mm / cycle.

Embodiment 3

[0053] 9.5wt% Zn, 2.3wt% Mg, 1.5% Cu, 0.4% Zr, FeIC (MPa*m 1 / 2 )=34, da / dN≤6×10 -3 mm / cycle.

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Abstract

This invention discloses a high strength, high toughness and high damage-tolerance aluminum alloy with high zinc-content, which is composed of Zn 9-10 wt.%, Mg 2.0-2.5 wt.%, Cu 1.2-1.7 wt.%, Zr 0.2-0.5 wt.%, Fe less than 0.05 wt.%, Si less than 0.05 wt.% and Al as balance. The aluminum alloy is manufactured by: mixing the raw materials, smelting, casting into alloy ingots, melting the ingots at 780-800 deg.C, carrying out fast-solidification injection molding with inert gas as an atomization gas under 0.5-1.0 MPa. The aluminum alloy has such advantages as uniform component distribution, uniform microstructure and no segregation. After reasonable thermal treatment, the aluminum alloy has an ultimate tensile strength high than 750 MPa and an elongation rate of 8-11%. The fracture toughness and fatigue strength of the aluminum alloy are better than those of 7050T74 material. The aluminum alloy can be used as key structures in aerospace and aviation industry, nuclear industry and military industry.

Description

technical field [0001] The invention relates to an aluminum alloy, especially a high-strength, high-toughness, high-damage-tolerance aluminum alloy material with a strength above 750 MPa and high fracture toughness and fatigue performance, 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, and has always been a key dual-use material for military and civilian use. Aluminum alloy is the second largest metal structural material after steel, and high strength and high toughness are the eternal development direction of aluminum alloy. If the ultimate tensile strength of aluminum alloy reaches 800MPa, its specific strength value will reach 300MPa cm 3 / g (for specific strength value 300MPa·cm 3 / g, which means that the steel material requires a strength of 2350MPa, and the titanium alloy reaches 1450MPa), which will...

Claims

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Application Information

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IPC IPC(8): C22C21/10C22C1/02C22F1/04
Inventor 张永安熊柏青朱宝宏刘红伟王锋
Owner GRIMAT ENG INST CO LTD
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