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High-strength weldable aluminum alloy for vehicle bodies and preparation method thereof

A technology for aluminum alloys and car bodies, which is applied in the field of high-strength weldable aluminum alloys for vehicle bodies and its preparation, can solve problems such as easy recrystallization, application limitations, and blanks, and achieve the effect of improving strength and excellent comprehensive performance

Active Publication Date: 2016-08-10
D MAG KUNSHAN NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of automobile lightweight requirements, research on aluminum alloy materials for rail vehicles, automobiles and other car bodies has achieved certain results at home and abroad, but research on the preparation of high-strength weldable aluminum , still blank
[0003] At present, 7005, 7N01, and 6005 aluminum alloys have been developed abroad for rail train body profiles. The above-mentioned alloys have good deformability and weldability, but the above-mentioned alloys are prone to recrystallization during the extrusion process, which leads to a decrease in the strength of the alloy. lower
[0004] High-strength Al-Zn-Mg-Cu alloys, such as 7075 and 7050 aluminum alloys, can meet the needs of structural materials for car bodies, but their application in the field of aluminum alloys for car bodies is limited due to their poor weldability

Method used

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  • High-strength weldable aluminum alloy for vehicle bodies and preparation method thereof
  • High-strength weldable aluminum alloy for vehicle bodies and preparation method thereof
  • High-strength weldable aluminum alloy for vehicle bodies and preparation method thereof

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Embodiment

[0024] Embodiment: a high-strength weldable aluminum alloy for a vehicle body, Zn in the alloy: 4.8-6.6wt.%, Mg: 1.0-2.0wt.%, Zr: 0.08-0.16wt.%, Sc: 0.03- 0.06wt.%, Ti: 0.01~0.03wt.%, Fe: <0.15wt.%. The content of Zr, Sc and Ti is preferably: Zr: 0.10-0.12wt.%, Sc: 0.05-0.06wt.%, Ti: 0.01-0.02wt.%. In the solid solution aging state, the alloy has a tensile strength of 480MPa-550MPa, an elongation of 11%-14%, and a welding coefficient of more than 0.65.

[0025] The smelting process of the high-strength weldable aluminum alloy for the vehicle body of the present invention: add pure metal aluminum to the furnace for melting, add pure metal zinc, Al-Zr master alloy, Al-Sc master alloy, Al-Ti master alloy after melting and heat up to 730-740°C, add pure metal magnesium, after these metals are melted and stirred evenly, heat up to 740-750°C, then use degassing agent hexachloroethane or argon-chlorine mixed gas to treat for 10-15min, after the treatment is completed, stir the alloy...

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Abstract

The invention relates to the technical field of non-ferrous metals, in particular to a high-strength weldable aluminum alloy for vehicle bodies and a preparation method thereof. The alloy comprises: 4.8-6.6wt.% of Zn, 1.0-2.0wt.% of Mg, 0.08-0.16wt.% of Zr, 0.03-0.06wt.% of Sc, 0.01-0.03wt.% of Ti, less than 0.15wt.% of Fe, less than 0.15wt.% of other unavoidable impurity elements, each of which is not less than 0.05wt.%, and the balance Al. The preparation method consists of: subjecting a cast ingot obtained by semicontinuous casting to uniform annealing at 200-220DEG C for 2h, then conducting furnace heating to 470-480DEG C and performing thermal insulation for 8h, then conducting hot extrusion and online water-crossing quenching, then performing heat preservation at 480-490DEG C for 1-3h, and conducting solution treatment, performing water quenching, then carrying out heat preservation at 130-160DEG C for 12-24h and conducting aging treatment. By adding elements Zr, SC and Ti, a lot of Al3Zr(Sc, Ti) dispersed phase is generated in the alloy to play a role of inhibiting recrystallized grains from nucleating and growing and obstructing dislocation migration, thereby obtaining excellent strength and toughness. The high-strength weldable aluminum alloy can be suitable for production of high-strength light structural parts for vehicle bodies.

Description

technical field [0001] The invention relates to the technical field of nonferrous metals, and discloses a high-strength weldable aluminum alloy for a vehicle body and a preparation method thereof. Background technique [0002] With the continuous improvement of automobile lightweight requirements, research on aluminum alloy materials for rail vehicles, automobiles and other car bodies has achieved certain results at home and abroad, but research on the preparation of high-strength weldable aluminum , is still blank. [0003] At present, 7005, 7N01, and 6005 aluminum alloys have been developed abroad for rail train body profiles. The above-mentioned alloys have good deformability and weldability, but the above-mentioned alloys are prone to recrystallization during the extrusion process, which leads to a decrease in the strength of the alloy. lower. [0004] High-strength Al-Zn-Mg-Cu alloys, such as 7075 and 7050 aluminum alloys, can meet the needs of structural materials fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/03C22F1/053
Inventor 赵志浩涂季冰李展志闫玮王高松陈洪美
Owner D MAG KUNSHAN NEW MATERIAL TECH CO LTD
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