High-strength Al-Mg-Si-Cu alloy for hot working and preparation method thereof

A hot working, high-strength technology, applied in the field of non-ferrous metals, can solve the problems of aluminum alloy fracture toughness, fatigue performance and stress corrosion resistance, and no strengthening effect, so as to improve the mechanical properties and optimize the process system.

Inactive Publication Date: 2012-11-21
苏州有色金属研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the content of Mn and Cr in the alloy exceeds a certain range, a large number of coarse and brittle second phases will be produced. These phases have no strengthening effect on the relative matrix, and are the places where stress concentration and crack initiation occur. Performance and stress corrosion resistance are adversely affected

Method used

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  • High-strength Al-Mg-Si-Cu alloy for hot working and preparation method thereof
  • High-strength Al-Mg-Si-Cu alloy for hot working and preparation method thereof
  • High-strength Al-Mg-Si-Cu alloy for hot working and preparation method thereof

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Effect test

Embodiment 1

[0028] The aluminum alloy composition is calculated by weight percentage: Mg 0.83wt.%, Si 1.35wt.%, Cu 0.47wt.%, Mn 0.64wt.%, Cr 0.29wt.%, Fe 0.14wt.%, Ti 0.03wt.%. The alloy ingot is homogenized in a circulating air furnace: the heating rate is raised to 560oC at a rate of 0.6oC / min, and air-cooled; the particle distribution of the dispersed phase of the alloy after homogenization is shown in the photo figure 1 shown. Then forging is carried out at 450oC, the forging processing rate is 50%, and the final forging temperature is not lower than 350oC. Finally, T6 heat treatment is performed on the forging: solution treatment at 550oC for 2h, quenching, and aging treatment at 180oC for 6h.

Embodiment 2

[0030] The aluminum alloy composition is calculated by weight percentage: Mg 0.80wt.%, Si 1.22wt.%, Cu 0.41wt.%, Mn 0.65wt.%, Cr 0.26wt.%, Fe 0.16wt.%, Ti 0.02wt.%. The alloy ingot is homogenized in a circulating air furnace: the heating rate is raised to 550oC at a rate of 7oC / min, kept for 4h, and air-cooled. Then forging is carried out at 450oC, the forging processing rate is 50%, and the final forging temperature is not lower than 350oC. Finally, T6 heat treatment is performed on the forging: solution treatment at 550oC for 2h, quenching, and aging treatment at 180oC for 6h.

Embodiment 3

[0032] The aluminum alloy composition is calculated by weight percentage: Mg 0.83wt.%, Si 1.35wt.%, Cu 0.47wt.%, Mn 0.64wt.%, Cr 0.29wt.%, Fe 0.14wt.%, Ti 0.03wt.%. The alloy ingot is homogenized in a circulating air furnace: the heating rate is raised to 540oC at a rate of 7oC / min, kept for 4h, and air-cooled. Then forging is carried out at 450oC, the forging processing rate is 50%, and the final forging temperature is not lower than 350oC. Finally, T6 heat treatment is performed on the forging: solution treatment at 550oC for 2h, quenching, and aging treatment at 180oC for 6h.

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Abstract

The invention relates to a high-strength Al-Mg-Si-Cu alloy for hot working and a preparation method thereof. The alloy comprises 0.8-1.4wt% of Mg, 0.8-1.6wt% of Si, 0.2-0.8wt% of Cu, 0.2-1.0wt% of Mn, 0.1-0.4wt% of Cr, 0.01-0.1wt% of Ti, no larger than 0.25wt% of Fe, no larger than 0.15wt% of inevitable impurities, and the balance of Al. The preparation method comprising the following steps: heating an alloy ingot to 520-570 DEG C in a cycle wind furnace with the heating rate of 0.1-10 DEG C/min, preserving the heat for 4-10 h, and conducting air cooling; heating up the uniformized ingot to 450-500 DEG C, then conducting hot working to deform, wherein the ending temperature is no less than 350 DEG C; conducting T6 heat treatment, conducting solution treatment at 530-570 DEG C for 1-2h, quenching, and then conducting aging treatment at 170-200 DEG C for 4-9h.

Description

technical field [0001] The invention relates to a high-strength Al-Mg-Si-Cu alloy suitable for thermal processing and a preparation method thereof, belonging to the technical field of nonferrous metals. Background technique [0002] For many years, the automobile industry has regarded the promotion of automobile lightweight as the primary problem to be solved. For this reason, automobile manufacturers and research institutions in various countries are committed to developing and improving automobile materials and their process conditions from the perspective of technology and economy, in order to reduce the weight of automobiles under the premise of ensuring performance and controlling costs. Aluminum alloy has become one of the important materials to promote automobile lightweight because of its good formability, high strength, corrosion resistance and low cost. [0003] The traditional structural aluminum alloy used in automobiles is 6061 alloy. Due to its low Mg and Si c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/08C22F1/05
Inventor 韩逸马科王雏艳长海博文张惠琳钱维锋
Owner 苏州有色金属研究院有限公司
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