7xxx系铝合金回归再时效的研究现状

Research status of regression and reaging on 7xxx series aluminum alloy

  • 摘要: 7xxx系铝合金作为高强度铝合金的代表,以其较高的强度以及良好的韧性和耐蚀性等优异性能而广泛地应用于航空航天及交通运输领域。该类可热处理强化铝合金对微观组织结构敏感,其性能受合金内部析出相的形核、生长及分布情况的影响。采用三级时效工艺-回归再时效处理,通过预时效、回归、再时效3个过程的有效配合改变合金的析出相状态,可以达到合金力学性能和耐蚀性能的良好结合。目前已有大量针对其在7xxx系铝合金应用的研究,并取得了一定进展。文中介绍了回归再时效处理的方法,以及其对7xxx系铝合金微观组织的改变和合金性能的影响,同时对目前该领域的研究现状进行归纳总结。

     

    Abstract: As a representative high-strength aluminum alloy, the 7xxx series aluminum alloy has been widely used in aerospace and transportation fields for its high strength, good toughness and corrosion resistance and other excellent properties. This kind of heat treatable aluminum alloy is sensitive to microstructure, and its properties are affected by the nucleation, growth and distribution of precipitates in the alloy. Its mechanical properties and corrosion resistance could be well combined by using the three-stage aging process-retrogression and reaging treatment-to change the precipitate state through the effective combination of preaging, retrogression and reaging. At present, many studies of its application on the 7xxx series aluminum alloy have been conducted, and some progress has been made. In this paper, the method of retrogression and reaging treatment was first introduced, and its effect on the microstructure and properties of 7xxx series aluminum alloy was then overviewed. Finally, the research status in this field was summarized.

     

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