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Preparation method of fine-crystal spume aluminium alloy

A foamed aluminum alloy and fine-grained technology, which is applied in the field of preparation of fine-grained foamed aluminum alloy, can solve problems such as large grain size, and achieve the effects of improving strength and simple equipment conditions.

Inactive Publication Date: 2008-05-21
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

At present, the known foam aluminum preparation technology can basically control the macroscopic pore structure and uniformity of the foam aluminum, but the obtained matrix material has a large grain size in the range of 10 μm to 100 μm, which fails to make full use of the metal matrix. The fine-grain strengthening and toughening effect, such as the porosity of 85%, the densification compressive strain (the index to measure the toughness of foamed aluminum) is greater than or equal to 60%, the yield strength of the foamed aluminum alloy generally does not exceed 10MPa

Method used

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  • Preparation method of fine-crystal spume aluminium alloy

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Effect test

Embodiment 1

[0010] The grain size-200 purpose Al90Y3Nd2Co5 (Al92wt.%, Y2wt.%, Nd2wt.%, Co4wt.%) amorphous powder and the grain size-200 purpose NaCl particle are mixed with the volume ratio of 1: 2, mix in the mixer ( Mixing time: 40 minutes, rotation speed: 100rpm), the mixed powder is put into the die, compacted on the press (pressure 500MPa), and then subjected to isothermal crystallization and sintering treatment (420°C, 35min., Ar gas protection), air cooling and water Rinse for 15 minutes to remove NaCl, and obtain a fine-grained foamed aluminum alloy with a porosity of 67%, a pore diameter of 0.1 mm to 1 mm, a matrix grain size of 600 nm to 800 nm, a yield strength of 30 MPa, and a densified compressive strain of 63%.

Embodiment 2

[0012] The particle size-200 purpose Al85Y4Nd4Co7 (Al85wt.%, Y4wt.%, Nd4wt.%, Co7wt.%) amorphous powder and the particle size-200 purpose NaCl particle are mixed with the volume ratio of 1: 3, mix in the mixer ( Mixing time: 20 minutes, rotation speed: 180rpm), the mixed powder is put into the die, compacted on the press (pressure 700MPa), and then subjected to isothermal crystallization and sintering treatment (355°C, 60min., Ar gas protection), air cooling and water Rinse for 30 minutes to remove NaCl, and obtain a fine-grained foamed aluminum alloy with a porosity of 75%, a pore diameter of 0.1-1mm, a matrix grain size of 300nm-600nm, a yield strength of 23MPa, and a densified compressive strain of 65%.

Embodiment 3

[0014] The particle size-200 mesh Al90Y3Nd2Co5 (Al90wt.%, Y3wt.%, Nd2wt.%, Co5wt.%) amorphous powder and the particle size-200 mesh NaCl particles are mixed with a volume ratio of 1:5, and mixed uniformly in a mixer ( Mixing time: 30 minutes, rotation speed: 140rpm), the mixed powder is put into the die, compacted on the press (pressure 900MPa), and then subjected to isothermal crystallization and sintering treatment (390°C, 40min., Ar gas protection), air cooling and water Rinse for 20 minutes to remove NaCl, and obtain a fine-grained foamed aluminum alloy with a porosity of 85%, a pore diameter of 0.1 mm to 1 mm, a matrix grain size of 500 nm to 700 nm, a yield strength of 13 MPa, and a densified compressive strain of 66%.

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Abstract

A method for preparing a fine-grained foam aluminum alloy belongs to the porous foam metal material field. According to the method, aluminum base non-crystal powder is evenly mixed with pore forming material and the mixture is compressed compactly to obtain the green compact; under the protection of argon and with the crystallization temperature of the aluminum base non-crystal powder, the process of isothermal annealing and crystallization and at the same time, the metal powder is sintered and cooled to the room temperature; water is used for dissolving the pore forming material and high-strength and tenacity foam aluminum alloy with fined matrix tissue. The invention fines the matrix tissue of the foam aluminum alloy according to the method of crystallization of non-crystal material; with the fine-grained consolidation action, the strength of the foam aluminum alloy is enhanced on the basis of not reducing the tenacity of the foam aluminum alloy.

Description

technical field [0001] The invention relates to a preparation method of a fine-grained foamed aluminum alloy, belonging to the field of porous foamed metal materials. Background technique [0002] Aluminum foam has the characteristics of light weight, high specific strength, sound absorption, shock absorption, heat preservation, and heat insulation. It has huge market potential in the fields of construction, automobiles, decoration, aerospace, ships, noise control, and shock absorbers. [0003] The lightweight structure application of foamed aluminum alloy requires that the foamed aluminum alloy has a uniform porous structure and its matrix material has high strength and toughness. Under the condition of certain pore structure, the effective way to improve the strength and toughness of foamed aluminum alloy is to refine the grains of the matrix material. At present, the known foam aluminum preparation technology can basically control the macroscopic pore structure and unifo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C1/04C22F1/04B22F3/16C22C21/00C22C45/08
Inventor 左孝青尹志其陆建生周芸
Owner KUNMING UNIV OF SCI & TECH
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