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An ultra-thick high-strength aluminum alloy plate and its preparation method

An aluminum alloy plate and aluminum alloy plate technology, which is applied in the field of aluminum alloy profile production, can solve the problems of difficulty in meeting the mechanical strength of quenching sensitive ultra-thick aluminum alloy plates, achieve fine and stable microstructure, reduce quenching sensitivity, and improve product quality. The effect of forming rate

Active Publication Date: 2020-07-17
YINGKOU ZHONGWANG ALUMINUM CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides an ultra-thick high-strength aluminum alloy plate in order to solve the problem that the existing 7-series large-section ultra-thick aluminum alloy plate has a quenching sensitivity that makes the mechanical strength of the ultra-thick aluminum alloy plate difficult to meet the standard. and its preparation method

Method used

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  • An ultra-thick high-strength aluminum alloy plate and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0025] A preparation method of an ultra-thick high-strength aluminum alloy plate, comprising the following steps:

[0026] A. Calculate the amount of each aluminum alloy raw material and prepare the aluminum alloy raw material according to the ratio. The mass percentage ratio of each element of the aluminum alloy sheet raw material is as follows:

[0027] element Zn Mg Cu Si Fe Ti impurities Al content 7.85 2.07 1.66 0.035 0.05 0.025 0.10 margin

[0028] The prepared aluminum alloy raw materials are sequentially put into the melting furnace in the order of high melting point and then low melting point, and then smelted into a liquid aluminum alloy, and the liquid aluminum alloy is melted and cast into an aluminum alloy ingot;

[0029] B. Carry out homogenization annealing to the aluminum alloy ingot casted in step A, wherein the annealing temperature is 464°C, and the holding time is 10h;

[0030] C, place the aluminum alloy ingot aft...

Embodiment 2

[0035] The difference between embodiment 2 and embodiment 1 is that in step A, the mass percentage ratio of each element of the raw material of the aluminum alloy sheet is as follows:

[0036] element Zn Mg Cu Si Fe Ti impurities Al content 8.3 2.10 1.69 0.04 0.065 0.025 0.10 margin

Embodiment 3

[0038] The difference between Example 3 and Example 1 is that in step B, the aluminum alloy ingot casted in step A is subjected to homogenization annealing, wherein the annealing temperature is 485° C. and the holding time is 4 h.

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Abstract

The invention belongs to the field of production of aluminum alloy sections, and relates to an ultra-thick high-strength aluminum alloy plate and a preparation method thereof. The ultra-thick high-strength aluminum alloy plate comprises, by mass, 7.85-8.3% of Zn, 2.07-2.10% of Mg, 1.66-1.69% of Cu, 0.035-0.04% of Si, 0.05-0.065% of Fe, 0.025% of Ti, no more than 0.15% of impurities and the balanceAl, wherein the content of each impurity is no more than 0.05%. Casting, homogenizing, extruding, solution treatment, stretcher straightening and multi-stage low-temperature aging treatment are sequentially conducted on high-strength aluminum alloy, and the Mg content, the Cu content and the process parameters in the preparation process are accurately controlled, so that the quenching sensitivityof the prepared aluminum alloy plate is greatly reduced, the mechanical strength and corrosion resistance of the aluminum alloy plate are improved, sections prepared from the aluminum alloy plate canreach the industrial standard, and the product forming rate is greatly increased.

Description

technical field [0001] The invention belongs to the field of aluminum alloy profile production, and relates to an ultra-thick high-strength aluminum alloy plate and a preparation method thereof. Background technique [0002] 7-series aluminum alloys have the characteristics of low density, high strength and good processing performance, and are widely used in aerospace, aviation and automotive industries. In recent years, in order to reduce the weight and cost, the aircraft structural parts are developing in the direction of large-scale and integrated, and there is an urgent need for large-section and super-thick 7-series alloy thick plates and forgings. [0003] High-strength 7xxx (Al-Zn) aluminum alloy products are widely used in aerospace structural applications, where extra thick plates are usually required for some large components such as wings. However, with the increase of the cross section of high-thickness aluminum alloys, the quenching-related cooling rate in the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 迟壮田洪超李健刘贵军吕洪伟王志会
Owner YINGKOU ZHONGWANG ALUMINUM CO LTD
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