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Super strong and tough 7055Sc aluminum alloy forging piece

A technology of aluminum alloy and aluminum intermediate alloy, which is applied in the direction of furnace types, furnaces, heat treatment furnaces, etc., can solve problems that need to be further improved, and achieve the effects of light weight, considerable economic benefits, and cost reduction

Active Publication Date: 2019-04-23
洛阳迈格镁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Aviation aluminum alloy materials mainly adopt traditional aluminum alloy materials such as 2A14, 2A04, 2219, and 7075, with a strength grade of 550 N / mm 2 , the maximum strength of extruded bars in the national standard is 7049A (bars with a diameter less than 100mm, the tensile strength is 610MPa, and the specified non-proportional elongation strength is 530 MPa), and the 7055 aluminum alloy is the aluminum alloy of the United States (ALCOA) since the 1980s. The developed one has the highest tensile strength among the published aluminum alloy standards in the world, with a tensile strength grade of 650MPa; however, with the development of the aviation industry, the required structural strength and toughness of the aluminum alloy still need to be further improved

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  • Super strong and tough 7055Sc aluminum alloy forging piece
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Experimental program
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Effect test

Embodiment 1

[0023] At present, there are no national standards and specifications for 7055 aluminum alloy extruded rods, only the American Aerospace Standard AMS2772E and the Aluminum Corporation of America (ALCOA) standard. According to the 7XXX series alloy strengthening theory, after research and analysis, to improve the tensile strength and corrosion resistance of the material, it is difficult to meet the user's requirements by simply changing the process parameters of the production process. First, we must consider the composition and add some metals in the form of alloys. By searching for information and researching individual metals that can improve strength and corrosion resistance, it was decided to add trace amounts of beryllium and scandium to the composition of 7055 aluminum alloy, extrude them into rods, and then undergo forging, solid solution and aging to achieve the final mechanical properties of the material. performance.

[0024] As long as a few thousandths of scandium ...

Embodiment 2

[0035] A kind of super strong and super tough 7055Sc aluminum alloy forging, its preparation method comprises the following steps:

[0036] (1) Melting:

[0037] a. Ingredients: The metal raw materials used must meet the national procurement standards. According to the ingredient standards and the chemical composition requirements of the enterprise standard 7055 ingots, various ingredients are accurately calculated, and the refined aluminum ingots for remelting that meet the composition requirements are used reasonably. The amount of aluminum ingots and alloy raw materials (zinc ingots, magnesium ingots), aluminum master alloys (AlCu50, AlMn20, AlZr4, AlTi5, AlBe1, AlSc5) used for melting, the amount of raw materials: (1 ton furnace test production)

[0038] Refined aluminum ingot for melting: 800Kg, aluminum ingot for remelting: 200Kg, aluminum-copper master alloy AlCu50: 46kg, aluminum-titanium-boron wire rod AlTi5: 0.8kg, aluminum-zirconium master alloy AlZr4: 3kg, aluminum...

Embodiment 3

[0061] A kind of super strong and super tough 7055Sc aluminum alloy forging, its preparation method comprises the following steps:

[0062] (1) Melting:

[0063] a. Ingredients: The metal raw materials used must meet the national procurement standards. According to the ingredient standards and the chemical composition requirements of the enterprise standard 7055 ingots, various ingredients are accurately calculated, and the refined aluminum ingots for remelting that meet the composition requirements are used reasonably. The amount of aluminum ingots and alloy raw materials (zinc ingots, magnesium ingots), aluminum master alloys (AlCu50, AlMn20, AlZr4, AlTi5, AlBe1, AlSc5) used for melting, the amount of raw materials: (1 ton furnace test production)

[0064] Refined aluminum ingot for melting: 800Kg, aluminum ingot for remelting: 200Kg, aluminum-copper master alloy AlCu50: 46kg, aluminum-titanium-boron wire rod AlTi5: 0.8kg, aluminum-zirconium master alloy AlZr4: 3kg, aluminum...

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Abstract

The invention discloses a super strong and tough 7055Sc aluminum alloy forging piece. The super strong and tough 7055Sc aluminum alloy forging piece is prepared by adding, by weight, less than or equal to 0.02% of yttrium and 0.05-0.1% of lanthanum to the 7055 aluminum alloy. The super strong and tough 7055Sc aluminum alloy forging piece is obtained by adding lanthanum and yttrium to the alloy rawmaterial, and then optimizing the smelting and extrusion process parameters, and the obtained extruded material is subjected to forging and solid solution aging treatment, so that the tensile strength is greater than 740 MPa; the non-proportional extension strength is greater than 700 MPa; and the elongation is greater than 10%, and the quality of the forging piece is much higher than the domestic and international standards.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a super-strong and super-tough 7055Sc aluminum alloy forging. Background technique [0002] Aviation aluminum alloy materials mainly adopt traditional aluminum alloy materials such as 2A14, 2A04, 2219, and 7075, with a strength grade of 550 N / mm 2 , the maximum strength of extruded bars in the national standard is 7049A (bars with a diameter less than 100mm, the tensile strength is 610MPa, and the specified non-proportional elongation strength is 530 MPa), and the 7055 aluminum alloy is the aluminum alloy of the United States (ALCOA) since the 1980s. The developed one has the highest tensile strength among the published aluminum alloy standards in the world, with a tensile strength grade of 650MPa; however, with the development of the aviation industry, the required structural strength and toughness of the aluminum alloy still need to be further improved . Co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053C22C1/03C21D9/00
CPCC21D9/0081C22C1/026C22C1/03C22C21/10C22F1/053
Inventor 李跃华阚保光高双玲
Owner 洛阳迈格镁业有限公司