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Aluminum alloy 7085 microalloyed with strontium and preparation method thereof

A technology of micro-alloying and aluminum alloy, applied in the field of strontium micro-alloyed 7085 type aluminum alloy and its preparation, new 7000 series aluminum alloy and its preparation field, can solve the problems of restricting development, relying on imports, etc., to improve the resistance to spalling Effects of Corrosive Properties

Active Publication Date: 2010-09-22
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, so far, my country has not yet had a 7085-type aluminum alloy with independent intellectual property rights available for use, and has long relied on imports, which has restricted the development of my country's aerospace, weaponry and other industries to a certain extent.

Method used

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  • Aluminum alloy 7085 microalloyed with strontium and preparation method thereof
  • Aluminum alloy 7085 microalloyed with strontium and preparation method thereof
  • Aluminum alloy 7085 microalloyed with strontium and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0030] Such as figure 1 , 2 shown.

[0031] A strontium microalloyed 7085 type aluminum alloy, the preparation method of which is:

[0032] Take 45kg aluminum alloy as an example.

[0033] First, 37.29kg of A00 grade pure Al (composition: 99.79% Al, 0.14% Fe, 0.04% Si, all components of the present invention are represented by mass percentage, the same below, and the parts where the sum of components is less than 100% are impurities ) after melting, add 1.44kg Al-Cu (49.62% Al, 50.12% Cu, 0.15% Fe, 0.11% Si) master alloy (the loss rate of Cu is about 6.25%), 0.42kg Al-Sr (89.86% Al, 9.89% %Sr, 0.15% Fe, 0.10% Si) master alloy (the loss rate of Sr is about 75%), 1.64kg Al-Zr master alloy (95.69% Al, 4.11% Zr, 0.20% Fe, 0.10% Si) (Zr The loss rate of Zn is about 8%), 3.42kg pure Zn (the loss rate of Zn is about 8%), 0.79kg pure Mg (the loss rate of Mg is about 20%), and the master alloy can be purchased directly from the market , can also be self-prepared by conventional me...

Embodiment 2

[0037] Such as image 3 , 4 shown.

[0038] A strontium microalloyed 7085 type aluminum alloy, the preparation method of which is:

[0039] According to the preparation of 45kg alloy.

[0040]First melt 36.39kg A00 grade pure Al (composition: 99.79% Al, 0.14% Fe, 0.04% Si) and then add 1.52kg Al-Cu (49.62% Al, 50.12% Cu, 0.15% Fe, 0.11% Si) master alloy (Cu loss rate is about 6.25%), 0.43kg Al-Sr (89.86% Al, 9.89% Sr, 0.15% Fe, 0.10% Si) master alloy (Sr loss rate is about 75%), 1.76kgAl-Zr Master alloy (95.69% Al, 4.11% Zr, 0.20% Fe, 0.10% Si) (Zr loss rate is about 8%), 3.89kg pure Zn (Zn loss rate is about 8%), 1.01kg pure Mg ( The loss rate of Mg is about 20%), described master alloy can be purchased directly from the market, also can adopt conventional method self-preparation, after the former master alloy or metal are melted in the melting process, add the latter master alloy or metal , after all of them are melted in turn, add hexachloroethane for refining (the add...

Embodiment 3

[0044] A strontium microalloyed 7085 type aluminum alloy, the preparation method of which is:

[0045] Take 45kg aluminum alloy as an example.

[0046] First melt 36.829kgA00 grade pure Al (composition: 99.79% Al, 0.14% Fe, 0.04% Si) and then add 1.475kg Al-Cu (49.62% Al, 50.12% Cu, 0.15% Fe, 0.11% Si) master alloy ( Cu loss rate is about 6.25%), 0.424kg Al-Sr (89.86% Al, 9.89% Sr, 0.15% Fe, 0.10% Si) master alloy (Sr loss rate is about 75%), 1.702kg Al-Zr intermediate Alloy (95.69% Al, 4.11% Zr, 0.20% Fe, 0.10% Si) (Zr loss rate is about 8%), 3.668kg pure Zn (Zn loss rate is about 8%), 0.906kg pure Mg (Mg The loss rate is about 20%). The master alloy can be purchased directly from the market, or can be prepared by conventional methods. During the melting process, the former master alloy or metal is melted and then the latter master alloy or metal is added. After all are melted into the aluminum solution in turn, add hexachloroethane to refine until there is no gas overflow ...

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Abstract

The invention discloses an aluminum alloy 7085 microalloyed with strontium, which is formed by microalloying aluminum alloy 7085 with a small amount of strontium. The alloy mainly comprises Al, Zn, Mg, Cu, Zr and Sr, wherein the mass percent of Zn is 7.0-7.95%, the mass percent of Mg is 1.41-1.80%, the mass percent of Cu is 1.50-1.59%, the mass percent of Zr is 0.138-0.148%, the mass percent of Sr is 0.0228-0.0237%, and the balance is Al and a small amount of impurity elements. The preparation process flow of the alloy is as follows: melting pure Al, sequentially adding Al-Cu intermediate alloy, Al-Sr intermediate alloy, Al-Zr intermediate alloy, pure Zn and pure Mg, melting, adding hexachloroethane for refining, standing and maintaining the temperature for 5-10 minutes, and then casting into ingots; and carrying out post treatments of annealing, stamping and soilid solution ageing on the alloy ingots formed by casting. The invention has the advantages of high rigidity, good exfoliation corrosion resistance and wide application range.

Description

technical field [0001] The invention relates to an aluminum alloy and a preparation method thereof, in particular to a novel 7000 series aluminum alloy and a preparation method thereof, in particular to a strontium microalloyed 7085 type aluminum alloy and a preparation method thereof. Background technique [0002] On February 26, 2007, Premier Wen Jiabao presided over an executive meeting of the State Council, which approved in principle the formal establishment of a major scientific and technological project for the development of large aircraft, which aroused great attention at home and abroad, including increasing investment in research on high-strength aluminum alloys for aviation. 7000 series (Al-Zn-Mg-Cu series) aluminum alloys are key structural materials in the fields of modern aerospace and weaponry. The advent of the latest generation of high-hardenability and high-strength aluminum alloy (7085 aluminum alloy) developed by the American Alcoa company at the beginni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
Inventor 许晓静吴桂潮王彬王宏宇韦宝存赵梓皓成城罗勇宋涛程晓农
Owner JIANGSU UNIV
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