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Al-mg-si aluminum alloy with excellent fatigue resistance and preparation method thereof

An aluminum alloy, fatigue resistance technology, applied in the field of Al-Mg-Si aluminum alloy and its preparation, can solve the problem of unfavorable safe application of Al-Mg-Si aluminum alloy, damage to the plasticity of Al-Mg-Si aluminum alloy, Unsatisfactory fatigue resistance of aluminum alloy and other problems, to avoid the decline of fatigue resistance, uniform distribution, and avoid the effect of natural aging

Active Publication Date: 2022-02-18
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the fatigue resistance of Al-Mg-Si series aluminum alloys has been unsatisfactory, which is obviously weaker than that of Al-Cu series and Al-Zn-Mg series, which is not conducive to the long-term durability of Al-Mg-Si series aluminum alloys on transportation tools. security application
At the same time, severe natural aging damages the plasticity of Al-Mg-Si aluminum alloys, further reducing their fatigue resistance.
Especially in cold regions, salt particles from melting snow accelerate the corrosion fatigue fracture of Al-Mg-Si aluminum alloys. If the alloy texture type is dominated by Cube texture, the fatigue life in NaCl solution will even be halved.

Method used

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  • Al-mg-si aluminum alloy with excellent fatigue resistance and preparation method thereof
  • Al-mg-si aluminum alloy with excellent fatigue resistance and preparation method thereof
  • Al-mg-si aluminum alloy with excellent fatigue resistance and preparation method thereof

Examples

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Embodiment 1

[0030] An Al-Mg-Si aluminum alloy with excellent fatigue resistance of the present invention is a 6061 aluminum alloy, and its specific composition is: by mass percentage, including 0.8% Mg, 0.4% Si, 0.3% Cu, 0.1% Mn, 0.1% Zn, 0.7% Fe, 0.1% Cr, and the balance is Al.

[0031] The Al-Mg-Si aluminum alloy of this example contains subgrains and α-Al phases inside the grains, and β-Mg at the grain boundaries and subgrain boundaries. 2 Si phase, and the subgrain boundary density is 3.5 times of the grain boundary density, the texture type is coexistence of Brass texture and Goss texture, and the percentages of Brass texture and Goss texture are 22% and 20% respectively.

[0032] A method for preparing an Al-Mg-Si aluminum alloy with excellent fatigue resistance in this embodiment, comprising:

[0033] After the homogenization treatment of the alloy, the forging deformation was carried out at 560°C with a true strain of 0.5, and then the creep aging was carried out at 250°C with a ...

Embodiment 2

[0036] An Al-Mg-Si aluminum alloy with excellent fatigue resistance of the present invention has the same chemical composition as that of Example 1.

[0037] The Al-Mg-Si aluminum alloy of this example contains subgrains and α-Al phases inside the grains, and β-Mg at the grain boundaries and subgrain boundaries. 2 Si phase, and the subgrain boundary density is 3.2 times of the grain boundary density, the texture type is coexistence of Brass texture and Goss texture, and the percentages of Brass texture and Goss texture are 15% and 18%, respectively.

[0038] A method for preparing an Al-Mg-Si aluminum alloy with excellent fatigue resistance in this embodiment differs from the method in Example 1 only in that the true strain of thermal deformation is 0.3.

[0039] The obtained Al-Mg-Si aluminum alloy is marked as sample No. 2, which contains subgrains and α-Al phases inside the grains, and β-Mg at the grain boundaries and subgrain boundaries. 2 Si phase, the texture type is th...

Embodiment 3

[0058] An Al-Mg-Si aluminum alloy with excellent fatigue resistance of the present invention is a 6101 aluminum alloy, and its specific composition is: by mass percentage, including: 0.8% Mg, 0.6% Si, 0.1% Cu, 0.1% Zn , 0.2% Fe, 0.05% B, and the balance is Al.

[0059] A method for preparing an Al-Mg-Si aluminum alloy with excellent fatigue resistance in this embodiment, comprising:

[0060] After the homogenization treatment of the alloy, extrusion deformation at 500°C to a true strain of 0.5, then creep aging at 210°C to a true strain of 0.2, and regression treatment at 180°C for 30 minutes, and finally at 120°C Carry out 12h of artificial aging, that is.

[0061] The obtained Al-Mg-Si aluminum alloy is marked as sample No. 6, which contains subgrains and α-Al phases inside the grains, and β-Mg at the grain boundaries and subgrain boundaries. 2 Si phase, and the sub-grain boundary density is 4.2 times of the grain boundary density, the texture type is the coexistence of Br...

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Abstract

The invention discloses an Al-Mg-Si series aluminum alloy with excellent fatigue resistance. The microstructure of the Al-Mg-Si series aluminum alloy includes: sub-grain and α-Al phase inside the grain, and grain boundary and sub-grain Grain boundary contains β-Mg 2 Si phase. Also disclosed is a method for preparing an Al-Mg-Si-based aluminum alloy with excellent fatigue resistance, comprising: successively performing thermal deformation, creep aging and artificial aging on the homogenized Al-Mg-Si-based aluminum alloy, namely have to. The microstructure of the aluminum alloy of the present invention is improved so as to obtain the effects of difficult nucleation of fatigue cracks, slow crack growth rate and resistance to stress corrosion fatigue. The aluminum alloy preparation method of the present invention has reasonable process design, simple equipment requirements, and convenient operation , low cost, high efficiency, and can stably prepare Al-Mg-Si-based aluminum alloys with improved microstructure and properties.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys and preparation, and relates to an Al-Mg-Si series aluminum alloy with excellent fatigue resistance and a preparation method thereof. Background technique [0002] Aluminum alloy is currently the most widely used lightweight material, which can reduce the weight of automobiles by more than 50%, and has received extensive attention in the field of lightweight at home and abroad. Among the many systems of aluminum alloys, Al-Mg-Si series (6xxx series) aluminum alloys are characterized by their superior machinability (better than Al-Si series), medium and high strength (better than Al-Mn series and Al-Mg series) ) and acid and alkali resistance (better than Al-Zn-Mg series) have become the preferred materials for lightweight transportation. However, the fatigue resistance of Al-Mg-Si series aluminum alloys has been unsatisfactory, which is obviously weaker than that of Al-Cu series and Al-Zn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/047C22C21/08
CPCC22F1/047C22C21/08
Inventor 霍庆欢
Owner CENT SOUTH UNIV
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